WO2016010755A1 - Method for treating food surfaces with quaternary ammonium salts - Google Patents
Method for treating food surfaces with quaternary ammonium salts Download PDFInfo
- Publication number
- WO2016010755A1 WO2016010755A1 PCT/US2015/039180 US2015039180W WO2016010755A1 WO 2016010755 A1 WO2016010755 A1 WO 2016010755A1 US 2015039180 W US2015039180 W US 2015039180W WO 2016010755 A1 WO2016010755 A1 WO 2016010755A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- methylcellulose
- substituted
- anhydroglucose
- anhydroglucose units
- quaternary ammonium
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 25
- 235000013305 food Nutrition 0.000 title claims abstract description 22
- 150000003242 quaternary ammonium salts Chemical class 0.000 title claims abstract description 17
- 229920000609 methyl cellulose Polymers 0.000 claims abstract description 49
- TWNIBLMWSKIRAT-VFUOTHLCSA-N levoglucosan Chemical group O[C@@H]1[C@@H](O)[C@H](O)[C@H]2CO[C@@H]1O2 TWNIBLMWSKIRAT-VFUOTHLCSA-N 0.000 claims abstract description 44
- 239000001923 methylcellulose Substances 0.000 claims abstract description 42
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims abstract description 31
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 27
- 230000001580 bacterial effect Effects 0.000 claims abstract description 5
- 238000011109 contamination Methods 0.000 claims abstract description 4
- 241000287828 Gallus gallus Species 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 13
- 235000015278 beef Nutrition 0.000 claims description 9
- 239000010868 animal carcass Substances 0.000 claims description 3
- 230000002401 inhibitory effect Effects 0.000 claims description 3
- 235000010981 methylcellulose Nutrition 0.000 description 43
- 239000000243 solution Substances 0.000 description 39
- 229920000642 polymer Polymers 0.000 description 33
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 32
- 238000001879 gelation Methods 0.000 description 28
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 24
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 16
- 239000004310 lactic acid Substances 0.000 description 16
- 235000014655 lactic acid Nutrition 0.000 description 16
- 239000000203 mixture Substances 0.000 description 16
- 235000013330 chicken meat Nutrition 0.000 description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 241000894006 Bacteria Species 0.000 description 12
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 12
- 239000000523 sample Substances 0.000 description 11
- 241000588724 Escherichia coli Species 0.000 description 10
- 238000009472 formulation Methods 0.000 description 10
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 9
- NEHMKBQYUWJMIP-UHFFFAOYSA-N chloromethane Chemical compound ClC NEHMKBQYUWJMIP-UHFFFAOYSA-N 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 8
- 238000003756 stirring Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- YMKDRGPMQRFJGP-UHFFFAOYSA-M cetylpyridinium chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCC[N+]1=CC=CC=C1 YMKDRGPMQRFJGP-UHFFFAOYSA-M 0.000 description 7
- 229960001927 cetylpyridinium chloride Drugs 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 235000013372 meat Nutrition 0.000 description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 230000000845 anti-microbial effect Effects 0.000 description 6
- 229920002678 cellulose Polymers 0.000 description 6
- 239000001913 cellulose Substances 0.000 description 6
- GRVDJDISBSALJP-UHFFFAOYSA-N methyloxidanyl Chemical group [O]C GRVDJDISBSALJP-UHFFFAOYSA-N 0.000 description 6
- 239000000178 monomer Substances 0.000 description 6
- 229920003086 cellulose ether Polymers 0.000 description 5
- 241000271566 Aves Species 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 4
- 229940050176 methyl chloride Drugs 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 238000006467 substitution reaction Methods 0.000 description 4
- WFDIJRYMOXRFFG-UHFFFAOYSA-N Acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- 208000032759 Hemolytic-Uremic Syndrome Diseases 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 3
- 241001465754 Metazoa Species 0.000 description 3
- 238000013459 approach Methods 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- -1 e.g. Substances 0.000 description 3
- 239000000284 extract Substances 0.000 description 3
- 239000000499 gel Substances 0.000 description 3
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 3
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 3
- 230000007062 hydrolysis Effects 0.000 description 3
- 238000006460 hydrolysis reaction Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 230000007928 solubilization Effects 0.000 description 3
- 238000005063 solubilization Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 2
- 241000272517 Anseriformes Species 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 229920003091 Methocel™ Polymers 0.000 description 2
- 108010053775 Nisin Proteins 0.000 description 2
- NVNLLIYOARQCIX-MSHCCFNRSA-N Nisin Chemical compound N1C(=O)[C@@H](CC(C)C)NC(=O)C(=C)NC(=O)[C@@H]([C@H](C)CC)NC(=O)[C@@H](NC(=O)C(=C/C)/NC(=O)[C@H](N)[C@H](C)CC)CSC[C@@H]1C(=O)N[C@@H]1C(=O)N2CCC[C@@H]2C(=O)NCC(=O)N[C@@H](C(=O)N[C@H](CCCCN)C(=O)N[C@@H]2C(NCC(=O)N[C@H](C)C(=O)N[C@H](CC(C)C)C(=O)N[C@H](CCSC)C(=O)NCC(=O)N[C@H](CS[C@@H]2C)C(=O)N[C@H](CC(N)=O)C(=O)N[C@H](CCSC)C(=O)N[C@H](CCCCN)C(=O)N[C@@H]2C(N[C@H](C)C(=O)N[C@@H]3C(=O)N[C@@H](C(N[C@H](CC=4NC=NC=4)C(=O)N[C@H](CS[C@@H]3C)C(=O)N[C@H](CO)C(=O)N[C@H]([C@H](C)CC)C(=O)N[C@H](CC=3NC=NC=3)C(=O)N[C@H](C(C)C)C(=O)NC(=C)C(=O)N[C@H](CCCCN)C(O)=O)=O)CS[C@@H]2C)=O)=O)CS[C@@H]1C NVNLLIYOARQCIX-MSHCCFNRSA-N 0.000 description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
- 108010017898 Shiga Toxins Proteins 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 241000191940 Staphylococcus Species 0.000 description 2
- DTQVDTLACAAQTR-UHFFFAOYSA-N Trifluoroacetic acid Chemical compound OC(=O)C(F)(F)F DTQVDTLACAAQTR-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000012736 aqueous medium Substances 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000013068 control sample Substances 0.000 description 2
- 230000000369 enteropathogenic effect Effects 0.000 description 2
- 230000000688 enterotoxigenic effect Effects 0.000 description 2
- 239000006153 eosin methylene blue Substances 0.000 description 2
- 235000019253 formic acid Nutrition 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- HVTICUPFWKNHNG-UHFFFAOYSA-N iodoethane Chemical compound CCI HVTICUPFWKNHNG-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002609 medium Substances 0.000 description 2
- 239000004309 nisin Substances 0.000 description 2
- 235000010297 nisin Nutrition 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- 239000011541 reaction mixture Substances 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 229920001817 Agar Polymers 0.000 description 1
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 241001112285 Berta Species 0.000 description 1
- 241000283690 Bos taurus Species 0.000 description 1
- 241000589876 Campylobacter Species 0.000 description 1
- 241000589875 Campylobacter jejuni Species 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 206010008631 Cholera Diseases 0.000 description 1
- 241000193155 Clostridium botulinum Species 0.000 description 1
- 241000193468 Clostridium perfringens Species 0.000 description 1
- 235000019542 Cured Meats Nutrition 0.000 description 1
- 208000004232 Enteritis Diseases 0.000 description 1
- 229920000896 Ethulose Polymers 0.000 description 1
- 239000001859 Ethyl hydroxyethyl cellulose Substances 0.000 description 1
- 241001546602 Horismenus Species 0.000 description 1
- 241000186781 Listeria Species 0.000 description 1
- 241000186779 Listeria monocytogenes Species 0.000 description 1
- 240000002129 Malva sylvestris Species 0.000 description 1
- 235000006770 Malva sylvestris Nutrition 0.000 description 1
- 241000124008 Mammalia Species 0.000 description 1
- RJQXTJLFIWVMTO-TYNCELHUSA-N Methicillin Chemical compound COC1=CC=CC(OC)=C1C(=O)N[C@@H]1C(=O)N2[C@@H](C(O)=O)C(C)(C)S[C@@H]21 RJQXTJLFIWVMTO-TYNCELHUSA-N 0.000 description 1
- 241001494479 Pecora Species 0.000 description 1
- 239000001888 Peptone Substances 0.000 description 1
- 108010080698 Peptones Proteins 0.000 description 1
- 241000286209 Phasianidae Species 0.000 description 1
- 241000607142 Salmonella Species 0.000 description 1
- 241001138501 Salmonella enterica Species 0.000 description 1
- 108010079723 Shiga Toxin Proteins 0.000 description 1
- 241000607768 Shigella Species 0.000 description 1
- 241000191967 Staphylococcus aureus Species 0.000 description 1
- 241000194017 Streptococcus Species 0.000 description 1
- 241000282887 Suidae Species 0.000 description 1
- 206010053615 Thermal burn Diseases 0.000 description 1
- 238000010162 Tukey test Methods 0.000 description 1
- 241000607598 Vibrio Species 0.000 description 1
- 241000607626 Vibrio cholerae Species 0.000 description 1
- 206010047400 Vibrio infections Diseases 0.000 description 1
- 241000607272 Vibrio parahaemolyticus Species 0.000 description 1
- 241000607265 Vibrio vulnificus Species 0.000 description 1
- 241000607734 Yersinia <bacteria> Species 0.000 description 1
- 241000607447 Yersinia enterocolitica Species 0.000 description 1
- 241000607477 Yersinia pseudotuberculosis Species 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000008272 agar Substances 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 description 1
- 238000001574 biopsy Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000036760 body temperature Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 235000013351 cheese Nutrition 0.000 description 1
- 238000004587 chromatography analysis Methods 0.000 description 1
- 235000009508 confectionery Nutrition 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000002027 dichloromethane extract Substances 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- LOKCTEFSRHRXRJ-UHFFFAOYSA-I dipotassium trisodium dihydrogen phosphate hydrogen phosphate dichloride Chemical compound P(=O)(O)(O)[O-].[K+].P(=O)(O)([O-])[O-].[Na+].[Na+].[Cl-].[K+].[Cl-].[Na+] LOKCTEFSRHRXRJ-UHFFFAOYSA-I 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000001033 ether group Chemical group 0.000 description 1
- 235000019326 ethyl hydroxyethyl cellulose Nutrition 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 210000003746 feather Anatomy 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 235000012055 fruits and vegetables Nutrition 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 235000020993 ground meat Nutrition 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000011534 incubation Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 1
- 239000012022 methylating agents Substances 0.000 description 1
- 229960003085 meticillin Drugs 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 239000012074 organic phase Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 235000019319 peptone Nutrition 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000002953 phosphate buffered saline Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 244000144977 poultry Species 0.000 description 1
- 235000013594 poultry meat Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 235000020991 processed meat Nutrition 0.000 description 1
- 108090000765 processed proteins & peptides Proteins 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- JUJWROOIHBZHMG-UHFFFAOYSA-O pyridinium Chemical compound C1=CC=[NH+]C=C1 JUJWROOIHBZHMG-UHFFFAOYSA-O 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 235000013580 sausages Nutrition 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000013207 serial dilution Methods 0.000 description 1
- 235000015170 shellfish Nutrition 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000003307 slaughter Methods 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 239000012354 sodium borodeuteride Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 1
- 235000019345 sodium thiosulphate Nutrition 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000001248 thermal gelation Methods 0.000 description 1
- 239000003053 toxin Substances 0.000 description 1
- 231100000765 toxin Toxicity 0.000 description 1
- 241001515965 unidentified phage Species 0.000 description 1
- 230000001018 virulence Effects 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 229940098232 yersinia enterocolitica Drugs 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
- A23L3/34—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals
- A23L3/3454—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals in the form of liquids or solids
- A23L3/3463—Organic compounds; Microorganisms; Enzymes
- A23L3/3526—Organic compounds containing nitrogen
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L13/00—Meat products; Meat meal; Preparation or treatment thereof
- A23L13/40—Meat products; Meat meal; Preparation or treatment thereof containing additives
- A23L13/42—Additives other than enzymes or microorganisms in meat products or meat meals
- A23L13/432—Addition of inorganic compounds, e.g. minerals; oligo-elements
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L29/00—Foods or foodstuffs containing additives; Preparation or treatment thereof
- A23L29/20—Foods or foodstuffs containing additives; Preparation or treatment thereof containing gelling or thickening agents
- A23L29/206—Foods or foodstuffs containing additives; Preparation or treatment thereof containing gelling or thickening agents of vegetable origin
- A23L29/262—Cellulose; Derivatives thereof, e.g. ethers
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
- A23V2002/00—Food compositions, function of food ingredients or processes for food or foodstuffs
Definitions
- This invention relates to a method for treating food surfaces with quaternary ammonium salts to improve efficacy of the compounds.
- U.S. Pub. No. 2009/0246336 discloses a method for reducing bacterial contamination in food by applying a bacteriophage treatment, in some embodiments together with a thickener.
- this reference does not disclose or suggest use of the methylcellulose polymers of the present invention.
- the problem addressed by this invention is to provide an improved method for treatment of food surfaces with quaternary ammonium salts.
- the present invention is directed to a method for reducing or inhibiting bacterial contamination on a food surface.
- the method comprises applying to the food surface a quaternary ammonium salt and a methylcellulose, wherein
- the methylcellulose has anhydroglucose units joined by 1-4 linkages wherein hydroxy groups of anhydroglucose units are substituted with methyl groups such that s23/s26 is 0.36 or less,
- s23 is the molar fraction of anhydroglucose units wherein only the two hydroxy groups in the 2- and 3 -positions of the anhydroglucose unit are substituted with methyl groups and
- s26 is the molar fraction of anhydroglucose units wherein only the two hydroxy groups in the 2- and 6-positions of the anhydroglucose unit are substituted with methyl groups.
- Percentages are weight percentages (wt ), temperatures are in °C and experiments were performed at room temperature (20-25°C), unless specified otherwise.
- a "food surface” is an outer surface of any food product.
- Food products include, e.g., meats, cheeses, fruits and vegetables.
- Meats are the flesh of animals intended for use as food. Animals include mammals (e.g., cows, pigs, sheep, buffalo), birds (e.g., chickens, turkeys, ducks, geese), fish and shellfish.
- Meats include processed meat products, e.g., sausage, cured meats, meat spreads, deli meats and ground meats.
- Preferred meats include beef and chicken. Especially preferred meats are fresh animal carcasses.
- Poultry processing begins with hanging of live birds followed by stunning and bleeding. After bleeding, while still suspending from the line, the birds pass through a scald tank for brief periods (about 1-2 minutes) to facilitate the subsequent step of feather plucking. These steps keep the bird carcasses at temperatures in the range of 32 - 40°C. After evisceration, in multiple stages, the birds are chilled. The chilling process may be via a dip in cold chlorinated water or by air chilling in cold rooms. Treating the bird carcasses when they are still warm and prior to their entry into chillers is a part of this invention.
- carcasses treated according to the present invention are those having a temperature at least 30°C, preferably at least 32°C, preferably at least 34°C, preferably at least 35°C, preferably at least 36°C, preferably at least 37°C; preferably no greater than 44°C, preferably no greater than 42°C, preferably no greater than 40°C.
- Quaternary ammonium salts suitable for use in the present invention are those effective in inhibiting growth of bacteria, including spoilage bacteria.
- Preferred compounds are effective against the following bacteria:
- Escherichia coli including Shiga Toxin producing Escherichia coli (STEC) (also including strains of Verotoxin-producing Escherichia coli that have been linked with the severe complication hemolytic -uremic syndrome (HUS)); enterohemorrhagic E. coli (EHEC), shiga-like toxin-producing E. coli (STEC or SLTEC) (the specific seven serogroups of STEC include (0157:H7, 026, O103, 045, 0111, 0121 and 0145) of enterohemorrhagic E. coli that have been declared adulterants in non-intact raw beef by
- HUSEC hemolytic uremic syndrome-associated enterohemorrhagic E. coli
- VTEC verocytotoxin- or verotoxin-producing E. coli
- EIEC enteroinvasive
- EPEC enteropathogenic
- ETEC enterotoxigenic
- EAEC enteroaggregative
- Salmonella species including, but not limited to Salmonella enterica strains with the following subspecies based on sero typing:
- Campylobacter species including Campylobacter jejuni
- Clostridium perfringens Clostridium botulinum
- Listeria species including Listeria monocytogenes
- Shigella spp. (including serotypes A, B, C and D)
- Staphylococcus species inlcuding Staphylococcus aureus including Methicillin resistant Staphylococcus and and including species causing Staphylococcal enteritis
- Vibrio cholerae Vibrio species including Vibrios cholera (including serotypes 01 and non-Ol, Vibrio parahaemolyticus, and Vibrio vulnificus
- the quaternary ammonium salt has at least one aromatic substituent, e.g., pyridinium or benzyl.
- the quaternary ammonium salt has at least one C8-C25 alkyl group, preferably C10-C2 0 . Cetyl pyridinium chloride is preferred.
- the quaternary ammonium salt is applied to the food surface in a liquid carrier.
- the liquid carrier is an aqueous medium.
- the aqueous medium is buffered, preferably to a pH from 4 to 9, preferably from 5 to 8.5, preferably from 6 to 8.
- the liquid carrier may also include other ingredients, e.g., surfactants, thickeners, stabilizers, solvents (preferably glycol solvents, e.g., propylene glycol, or glycerol).
- solvents when solvents are included they are present in an amount no greater than 10 wt , preferably no greater than 7 wt , preferably no greater than 4 wt , preferably no greater than 3 wt , preferably no greater than 2 wt .
- concentration of quaternary ammonium salt varies depending on its activity.
- the concentration is from 0.1 to 10 wt , preferably at least 0.4 wt , preferably at least 0.7 wt ; preferably no more than 8 wt , preferably no more than 6 wt . preferably no more than 5 wt .
- the quaternary ammonium salt and the methylcellulose may be applied to the food surface together in the same liquid carrier or separately in separate liquid carriers.
- the quaternary ammonium salt and the methylcellulose are applied to the food surface in the same liquid carrier.
- a liquid carrier is at a temperature from 4 to 30°C, preferably no greater than 28°C, preferably no greater than 26°C, preferably no greater than 24°C, preferably no greater than 22°C; preferably at least 6°C, preferably at least 8°C, preferably at least 10°C, preferably at least 12°C, preferably at least 14°C.
- the liquid carrier is stored within the above limits.
- the manner in which the quaternary ammonium salt and methylcellulose are applied to the surface is not critical.
- liquid carrier containing quaternary ammonium salt and methylcellulose is applied to the food surface in an amount from 5 to 100 mg/cm 2 , preferably 10 to 90 mg/cm 2 , preferably 15 to 80 mg/cm 2 .
- the concentration of the methylcellulose in the treatment solution is from
- 0.5 to 10 wt based on the total weight of the solution, preferably at least 0.7 wt , preferably at least 0.9 wt , preferably at least 1.1 wt , preferably at least 1.3 wt , preferably at least 1.5 wt ; preferably no more than 8 wt , preferably no more than 6 wt , preferably no more than 4 wt .
- a specific methylcellulose is an essential component in the method.
- the methylcellulose has anhydroglucose units joined by 1-4 linkages. Each anhydroglucose unit contains hydroxyl groups at the 2, 3, and 6 positions. Partial or complete substitution of these hydroxyls creates cellulose derivatives. For example, treatment of cellulosic fibers with caustic solution, followed by a methylating agent, yields cellulose ethers substituted with one or more methoxy groups. If not further substituted with other alkyls, this cellulose derivative is known as methylcellulose.
- composition for delivery of the invention comprises a methylcellulose wherein hydroxy groups of anhydroglucose units are substituted with methyl groups such that s23/s26 is 0.36 or less, preferably 0.33 or less, more preferably 0.30 or less, most preferably 0.27 or less or 0.26 or less, and particularly 0.24 or less or 0.22 or less.
- s23/s26 is 0.08 or more, 0.10 or more, 0.12 or more, 0.14 or more, or 0.16 or more.
- s23 is the molar fraction of anhydroglucose units wherein only the two hydroxy groups in the 2- and 3-positions of the anhydroglucose unit are substituted with methyl groups
- s26 is the molar fraction of anhydroglucose units wherein only the two hydroxy groups in the 2- and 6-positions of the anhydroglucose unit are substituted with methyl groups.
- the term "the molar fraction of anhydroglucose units wherein only the two hydroxy groups in the 2- and 3-positions of the anhydroglucose unit are substituted with methyl groups” means that the two hydroxy groups in the 2- and 3-positions are substituted with methyl groups and the 6-positions are unsubstituted hydroxy groups.
- the term "the molar fraction of anhydroglucose units wherein only the two hydroxy groups in the 2- and 6-positions of the anhydroglucose unit are substituted with methyl groups” means that the two hydroxy groups in the 2- and 6-positions are substituted with methyl groups and the 3-positions are unsubstituted hydroxy groups.
- Formula I illustrates the numbering of the hydroxy groups in anhydroglucose units.
- hydroxy groups of anhydroglucose units are substituted with methyl groups such that the s23/s26 of the methylcellulose is 0.27 or less, preferably 0.26 or less, more preferably 0.24 or less or even 0.22 or less.
- s23/s26 of the methylcellulose preferably is 0.08 or more, 0.10 or more, 0.12 or more, 0.14 or more, 0.16 or more, or 0.18 or more.
- hydroxy groups of anhydroglucose units are substituted with methyl groups such that the s23/s26 of the methylcellulose is more than 0.27 and up to 0.36, preferably more than 0.27 and up to 0.33, and most preferably more than 0.27 and up to 0.30.
- Methylcelluloses wherein hydroxy groups of anhydroglucose units are substituted with methyl groups such that s23/s26 is about 0.29 are commercially available under the trade name METHOCEL SG or SGA (The Dow Chemical Company). They gel at a relatively low temperature, at 38 °C to 44 °C at a concentration of 2 wt. % in water.
- US Patent No. 6,235,893 teaches the preparation of methylcelluloses of which 1.5 wt. % solutions in water exhibit onset gelation temperatures of 31 - 54 °C, most of them exhibiting gelation temperatures of 35 - 45 °C.
- the methylcellulose preferably has a DS(methyl) of from 1.55 to 2.25, more preferably from 1.65 to 2.20, and most preferably from 1.70 to 2.10.
- the degree of the methyl substitution, DS(methyl), also designated as DS(methoxyl), of a methylcellulose is the average number of OH groups substituted with methyl groups per anhydroglucose unit.
- % methoxyl in methylcellulose is carried out according to the United States Pharmacopeia (USP 34). The values obtained are % methoxyl. These are subsequently converted into degree of substitution (DS) for methyl substituents. Residual amounts of salt have been taken into account in the conversion.
- the viscosity of the methylcellulose is generally at least 2.4 mPa»s, preferably at least 3 mPa»s, and most preferably at least 10 mPa»s, when measured as a 2 wt. % aqueous solution at 5 °C at a shear rate of 10 s "1 .
- the viscosity of the methylcellulose is preferably up to 10,000 mPa»s, more preferably up to 5000 mPa»s, and most preferably up to 2000 mPa»s, when measured as indicated above.
- Methylcelluloses MC-1 to MC-4 were produced according to the following procedure. Finely ground wood cellulose pulp was loaded into a jacketed, agitated reactor. The reactor was evacuated and purged with nitrogen to remove oxygen, and then evacuated again. The reaction is carried out in two stages. In the first stage, a 50 weight percent aqueous solution of sodium hydroxide was sprayed onto the cellulose until the level reached 1.8 mol of sodium hydroxide per mol of anhydroglucose units of the cellulose, and then the temperature was adjusted to 40 °C.
- the second stage of the reaction was started by addition of methyl chloride in an amount of 3.4 molar equivalents of methyl chloride per mol of anhydroglucose unit.
- the addition time for methyl chloride was 20 min.
- a 50 weight percent aqueous solution of sodium hydroxide at an amount of 2.9 mol of sodium hydroxide per mol of anhydroglucose units was added over a time period of 45 min.
- the rate of addition was 0.064 mol of sodium hydroxide per mol of anhydroglucose units per minute.
- the contents of the reactor were heated up to 80 °C in 20 min and then kept at a temperature of 80 °C for 120 min.
- the reactor was vented and cooled down to about 50 °C.
- the contents of the reactor were removed and transferred to a tank containing hot water.
- the crude methylcellulose was then neutralized with formic acid and washed chloride free with hot water (assessed by AgNCb flocculation test), cooled to room temperature and dried at 55 °C in an air-swept drier, and subsequently ground.
- the methylcellulose had a DS(methyl) of 1.88 (30.9 wt. methoxyl), a mol fraction (26-Me) of 0.3276 + 0.0039, a mol fraction (23-Me) of 0.0642 + 0.0060, an s23/s26 of 0.20 + 0.02, and a steady- shear-flow viscosity ⁇ (5 °C, 10 s "1 , 2 wt.% MC) of 5500 mPa»s.
- the properties of the methylcellulose were measured as described below.
- Samples of the produced methylcellulose were partially depolymerized by a known procedure to obtain the methylcelluloses MC-1 to MC-4.
- the ground samples are treated with gaseous hydrogen chloride at a temperature of about 85 °C.
- About 1.5 g gaseous hydrogen chloride per kg of methylcellulose is used.
- the reaction period is adapted to the desired viscosity.
- Partial depolymerization of cellulose ethers using gaseous hydrogen chloride is generally known from European patent application EP 1 141 029 and the prior art cited therein. The partial depolymerization does not impact the DS(methyl) or the s23/s26.
- the properties of the methylcelluloses MC-1 to MC-4 were measured as described below.
- methylcellulose was transferred to a 22-mL screw-cap vial to begin the perethylation process.
- Powdered sodium hydroxide freshly pestled, analytical grade, Merck, Darmstadt, Germany
- ethyl iodide for synthesis, stabilized with silver, Merck-Schuchardt, Hohenbrunn, Germany
- reaction mixture could be diluted with up to 1.5 mL DMSO to ensure good mixing during the course of the reaction.
- 5 mL of 5 % aqueous sodium thiosulfate solution was poured into the reaction mixture, and the mixture was then extracted three times with 4 mL of dichloromethane.
- the combined extracts were washed three times with 2 mL of water.
- the organic phase was dried with anhydrous sodium sulfate (aboutl g). After filtration, the solvent was removed with a gentle stream of nitrogen, and the sample was stored at 4 °C until needed.
- the residue of the reduction was acetylated with 600 ⁇ L of acetic anhydride and 150 ⁇ L of pyridine for 3 hrs at 90 °C. After cooling, the sample vial was filled with toluene and evaporated to dryness in a stream of nitrogen at room temperature. The residue was dissolved in 4 mL of dichloromethane and poured into 2 mL of water and extracted with 2 mL of dichloromethane. The extraction was repeated three times. The combined extracts were washed three times with 4 mL of water and dried with anhydrous sodium sulfate. The dried dichloromethane extract was subsequently submitted to GC analysis. Depending on the sensitivity of the GC system, a further dilution of the extract could be necessary.
- Quantitative monomer composition data were obtained from the peak areas measured by GLC with FID detection. Molar responses of the monomers were calculated in line with the effective carbon number (ECN) concept but modified as described in the table below.
- the effective carbon number (ECN) concept has been described by Ackman (R.G. Ackman, J. Gas Chromatogr., 2 (1964) 173-179 and R.F. Addison, R.G. Ackman, J. Gas Chromatogr., 6 (1968) 135-138) and applied to the quantitative analysis of partially alkylated alditol acetates by Sweet et. al (D.P. Sweet, R.H. Shapiro, P. Albersheim, Carbohyd. Res., 40 (1975) 217- 225).
- the peak areas were multiplied by molar response factors MRFmonomer which are defined as the response relative to the 2,3,6-Me monomer.
- MRFmonomer molar response factors
- the mol fractions of the monomers were calculated by dividing the corrected peak areas by the total corrected peak area according to the following formulas:
- % methoxyl in methylcellulose was carried out according to the United States Pharmacopeia (USP34). The values obtained were % methoxyl. These were subsequently converted into degree of substitution (DS) for methyl substituents. Residual amounts of salt were taken into account in the conversion.
- Concentrated polymer solutions were prepared by adding dry cellulose ether powder to water which had an initial temperature of 25 °C while stirring to achieve a good dispersion. The mixture of the MC and water was cooled to 2 °C within 20 minutes while stirring. After the polymer solution reached the temperature of 2 °C, solution preparation was completed by high shear mixing using an immersion mixer for two minutes. Formulations were prepared by mixing the antimicrobial active with a stock solution of fully hydrated cellulose ether polymer and diluting with water to achieve the desired concentrations.
- Model substrates tested include chicken skin and slices of beef. Substrates were mounted on an aluminum pan and incubated in sealed container at 37C, only removing from the incubator to apply solutions. An area of approximately 10 cm 2 was inoculated with 1 mL of E. coli ATCC 11303 culture, from a stock culture grown overnight in Difco media to about 1 x 10 8 CFU per ml.. The culture was allowed to incubate on the surface for 30 minutes, any excess was then allowed to drip from the surface while the sample was held vertical prior to the same area beingsprayed with 600 microliters of formulation. In each example one sample is included that was inoculated with bacteria but no formulation applied, labeled as the control.
- the steady-shear-flow viscosity h(5 °C, 10 s "1 , 2 wt. MC) of an aqueous 2-wt. methylcellulose solution was measured at 5 °C at a shear rate of 10 s "1 with an Anton Paar Physica MCR 501 rheometer and cup and bob fixtures.
- CPC Cetyl Pyridinium Chloride
- PG propylene glycol
- the gelling solution results in a significantly greater reduction in bacteria than the solution containing the non-gelling polymer.
- Table 3 CPC on Chicken Skin Efficacy and Gelation Properties
- Lactic acid on chicken skin demonstrating medium and high viscosity polymers Solutions containing medium viscosity (MC-2) and high viscosity (MC-3) polymers demonstrate gelation in the desired range while conventional polymers of equivalent viscosity do not. Both the solution containing 2% lactic acid with either 2% MC-2 or 1% MC-3 demonstrated a significantly greater reduction in bacteria than the sample containing 2% lactic acid with no polymer.
- Lactic acid on chicken demonstrating polymer concentration comparison The effect of polymer concentration on gelation temperature and efficacy was demonstrated using the low viscosity polymer MC-1.
- a solution containing 1% polymer exhibits gelation above the target temperature of 37C and does not result in increased efficacy.
- the solutions containing 2% lactic acid with 3% MC-1, 5% MC-1, or 8% MC-1 all resulted in significantly greater reduction in bacteria when compared to the solution of 2% lactic acid with no polymer.
- Lactic acid solution on chicken skin demonstrating gelling vs. non-gelling polymers The advantage of a gelling polymer solution compared to a non-gelling was evaluated comparing MC-1 to an equivalent viscosity grade conventional polymer. The gelling polymer exhibited gelation prior to 37°C and resulted in greater bacterial reduction than the conventional, which did not gel at the desired temperature. The gelling solution containing 2% lactic acid and 5% MC-1 resulted in a significantly greater reduction in bacteria than the 2% lactic acid solution with no polymer. Table 9. Gelling vs. Non-gelling Formulation Efficacy and Gelation Properties
- Lactic Acid on Beef The advantage of a gelling polymer was demonstrated using beef as a substrate.
- the gelling solution containing 2% lactic acid and 8% MC-1 resulted in significantly greater reduction than the solution containing 2% lactic acid with no polymer.
- Gelling Peptide Formulations Solutions containing nisin and gelling polymer exhibited gelation within the desired temperature range. Gelled solutions will increase residence time on a food surface and increase efficacy. Table 15. Gelation Properties of Nisin Formulations
- CPC/propylene glycol increase the gelation temperature of the 3% MC-1 solution by 8 degrees.
- An equivalent solution prepared in phosphate buffered saline returns the gelation temperature to 30°C, and in a 2% solution of sodium chloride is depressed even lower to 28°C.
- Addition of a gelation temperature additive such as a salt or buffer, or increased polymer concentration, can be used to offset the addition of a gel temp increasing active ingredient.
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Food Science & Technology (AREA)
- Nutrition Science (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Polymers & Plastics (AREA)
- Dispersion Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Microbiology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- General Preparation And Processing Of Foods (AREA)
- Meat, Egg Or Seafood Products (AREA)
Abstract
A method for reducing bacterial contamination on a food surface. The method comprises applying to the food surface a quaternary ammonium salt and a methylcellulose, The methylcellulose has anhydroglucose units joined by 1-4 linkages wherein hydroxy groups of anhydroglucose units are substituted with methyl groups such that s23/s26 is 0.36 or less, wherein s23 is the molar fraction of anhydroglucose units wherein only the two hydroxy groups in the 2- and 3 -positions of the anhydroglucose unit are substituted with methyl groups and wherein s26 is the molar fraction of anhydroglucose units wherein only the two hydroxy groups in the 2- and 6-positions of the anhydroglucose unit are substituted with methyl groups.
Description
METHOD FOR TREATING FOOD
SURFACES WITH QUATERNARY AMMONIUM SALTS
This invention relates to a method for treating food surfaces with quaternary ammonium salts to improve efficacy of the compounds.
U.S. Pub. No. 2009/0246336 discloses a method for reducing bacterial contamination in food by applying a bacteriophage treatment, in some embodiments together with a thickener. However, this reference does not disclose or suggest use of the methylcellulose polymers of the present invention.
The problem addressed by this invention is to provide an improved method for treatment of food surfaces with quaternary ammonium salts.
STATEMENT OF THE INVENTION
The present invention is directed to a method for reducing or inhibiting bacterial contamination on a food surface. The method comprises applying to the food surface a quaternary ammonium salt and a methylcellulose, wherein
the methylcellulose has anhydroglucose units joined by 1-4 linkages wherein hydroxy groups of anhydroglucose units are substituted with methyl groups such that s23/s26 is 0.36 or less,
wherein s23 is the molar fraction of anhydroglucose units wherein only the two hydroxy groups in the 2- and 3 -positions of the anhydroglucose unit are substituted with methyl groups and
wherein s26 is the molar fraction of anhydroglucose units wherein only the two hydroxy groups in the 2- and 6-positions of the anhydroglucose unit are substituted with methyl groups.
DETAILED DESCRIPTION OF THE INVENTION
Percentages are weight percentages (wt ), temperatures are in °C and experiments were performed at room temperature (20-25°C), unless specified otherwise. A "food surface" is an outer surface of any food product. Food products include, e.g., meats, cheeses, fruits and vegetables. Meats are the flesh of animals intended for use as food. Animals include mammals (e.g., cows, pigs, sheep, buffalo), birds (e.g., chickens, turkeys, ducks, geese), fish and shellfish. Meats include processed meat products, e.g., sausage, cured meats, meat
spreads, deli meats and ground meats. Preferred meats include beef and chicken. Especially preferred meats are fresh animal carcasses.
In beef production live animals are slaughtered, bled, their hides are removed and the carcasses are eviscerated. At this stage the carcasses are split in to two halves and treated to diminish microbial populations on their surface, which may be in the form of high temperature water washes and spraying with antimicrobial solutions. Throughout these stages the carcasses are warm (at 35 - 38°C), with their temperatures only a few degrees lower than their pre-slaughter body temperatures. These carcasses are now sent to a chiller where they will cool down to about 4-7°C over the next 14-24 hours. Treating the carcasses when they are still warm is an inherent part of this invention.
Poultry processing begins with hanging of live birds followed by stunning and bleeding. After bleeding, while still suspending from the line, the birds pass through a scald tank for brief periods (about 1-2 minutes) to facilitate the subsequent step of feather plucking. These steps keep the bird carcasses at temperatures in the range of 32 - 40°C. After evisceration, in multiple stages, the birds are chilled. The chilling process may be via a dip in cold chlorinated water or by air chilling in cold rooms. Treating the bird carcasses when they are still warm and prior to their entry into chillers is a part of this invention.
Preferably, carcasses treated according to the present invention are those having a temperature at least 30°C, preferably at least 32°C, preferably at least 34°C, preferably at least 35°C, preferably at least 36°C, preferably at least 37°C; preferably no greater than 44°C, preferably no greater than 42°C, preferably no greater than 40°C.
Quaternary ammonium salts suitable for use in the present invention are those effective in inhibiting growth of bacteria, including spoilage bacteria. Preferred compounds are effective against the following bacteria:
Escherichia coli including Shiga Toxin producing Escherichia coli (STEC) (also including strains of Verotoxin-producing Escherichia coli that have been linked with the severe complication hemolytic -uremic syndrome (HUS)); enterohemorrhagic E. coli (EHEC), shiga-like toxin-producing E. coli (STEC or SLTEC) (the specific seven serogroups of STEC include (0157:H7, 026, O103, 045, 0111, 0121 and 0145) of enterohemorrhagic E. coli that have been declared adulterants in non-intact raw beef by
US Federal Drug Authority), hemolytic uremic syndrome-associated enterohemorrhagic E. coli (HUSEC) and verocytotoxin- or verotoxin-producing E. coli (VTEC).
Other Escherichia coli strains that have been various referred to by other virulence properties, such as enteroinvasive (EIEC), enteropathogenic (EPEC), enterotoxigenic (ETEC), enteroaggregative (EAEC or EAgEC)
Salmonella species, including, but not limited to Salmonella enterica strains with the following subspecies based on sero typing:
Enteritidis, Kentucky, Typhimurium, Typhimurium Covariant V, Heidelberg, Hadar , Newport , Georgia, Agona, Grampian, Senftenberg , Alachua , Infantis , Reading, Schwarzengrund, Mbandaka, Montevideo, Berta and Thompson.
Campylobacter species (including Campylobacter jejuni)
Clostridium perfringens; Clostridium botulinum
Listeria species (including Listeria monocytogenes)
Shigella spp. (including serotypes A, B, C and D)
Staphylococcus species inlcuding Staphylococcus aureus ( including Methicillin resistant Staphylococcus and and including species causing Staphylococcal enteritis
Streptococcus species
Vibrio cholerae Vibrio species including Vibrios cholera (including serotypes 01 and non-Ol, Vibrio parahaemolyticus, and Vibrio vulnificus
Yersinia species Including Yersinia enterocolitica and Yersinia pseudotuberculosis Preferably, the quaternary ammonium salt has at least one aromatic substituent, e.g., pyridinium or benzyl. Preferably, the quaternary ammonium salt has at least one C8-C25 alkyl group, preferably C10-C20. Cetyl pyridinium chloride is preferred.
Preferably, the quaternary ammonium salt is applied to the food surface in a liquid carrier. Preferably, the liquid carrier is an aqueous medium. Preferably, the aqueous medium is buffered, preferably to a pH from 4 to 9, preferably from 5 to 8.5, preferably from 6 to 8. The liquid carrier may also include other ingredients, e.g., surfactants, thickeners, stabilizers, solvents (preferably glycol solvents, e.g., propylene glycol, or glycerol). Preferably, when solvents are included they are present in an amount no greater than 10 wt , preferably no greater than 7 wt , preferably no greater than 4 wt , preferably no greater than 3 wt , preferably no greater than 2 wt . The concentration of quaternary ammonium salt varies depending on its activity. Preferably, the concentration is from 0.1 to 10 wt , preferably at least 0.4 wt , preferably at least 0.7 wt ; preferably no more than 8 wt , preferably no more than 6 wt . preferably no more than 5 wt .
The quaternary ammonium salt and the methylcellulose may be applied to the food surface together in the same liquid carrier or separately in separate liquid carriers. Preferably, the quaternary ammonium salt and the methylcellulose are applied to the food surface in the same liquid carrier. At the time of application to the food surface, preferably a liquid carrier is at a temperature from 4 to 30°C, preferably no greater than 28°C, preferably no greater than 26°C, preferably no greater than 24°C, preferably no greater than 22°C; preferably at least 6°C, preferably at least 8°C, preferably at least 10°C, preferably at least 12°C, preferably at least 14°C. Preferably, the liquid carrier is stored within the above limits. The manner in which the quaternary ammonium salt and methylcellulose are applied to the surface is not critical. Standard methods for applying liquids to a surface may be used, including, e.g., dripping, immersion, brushing and spraying; although spraying is preferred. Preferably, the liquid carrier containing quaternary ammonium salt and methylcellulose is applied to the food surface in an amount from 5 to 100 mg/cm2, preferably 10 to 90 mg/cm2, preferably 15 to 80 mg/cm2.
Preferably, the concentration of the methylcellulose in the treatment solution is from
0.5 to 10 wt , based on the total weight of the solution, preferably at least 0.7 wt , preferably at least 0.9 wt , preferably at least 1.1 wt , preferably at least 1.3 wt , preferably at least 1.5 wt ; preferably no more than 8 wt , preferably no more than 6 wt , preferably no more than 4 wt .
In the present invention, a specific methylcellulose is an essential component in the method. The methylcellulose has anhydroglucose units joined by 1-4 linkages. Each anhydroglucose unit contains hydroxyl groups at the 2, 3, and 6 positions. Partial or complete substitution of these hydroxyls creates cellulose derivatives. For example, treatment of cellulosic fibers with caustic solution, followed by a methylating agent, yields cellulose ethers substituted with one or more methoxy groups. If not further substituted with other alkyls, this cellulose derivative is known as methylcellulose.
An essential feature of the specific methylcellulose used in the method of the present invention is the position of the methyl groups. The composition for delivery of the invention comprises a methylcellulose wherein hydroxy groups of anhydroglucose units are substituted with methyl groups such that s23/s26 is 0.36 or less, preferably 0.33 or less, more preferably 0.30 or less, most preferably 0.27 or less or 0.26 or less, and particularly 0.24 or less or 0.22 or less. Preferably s23/s26 is 0.08 or more, 0.10 or more, 0.12 or more, 0.14 or more, or 0.16 or more.
In the ratio s23/s26, s23 is the molar fraction of anhydroglucose units wherein only
the two hydroxy groups in the 2- and 3-positions of the anhydroglucose unit are substituted with methyl groups and s26 is the molar fraction of anhydroglucose units wherein only the two hydroxy groups in the 2- and 6-positions of the anhydroglucose unit are substituted with methyl groups. For determining the s23, the term "the molar fraction of anhydroglucose units wherein only the two hydroxy groups in the 2- and 3-positions of the anhydroglucose unit are substituted with methyl groups" means that the two hydroxy groups in the 2- and 3-positions are substituted with methyl groups and the 6-positions are unsubstituted hydroxy groups. For determining the s26, the term "the molar fraction of anhydroglucose units wherein only the two hydroxy groups in the 2- and 6-positions of the anhydroglucose unit are substituted with methyl groups" means that the two hydroxy groups in the 2- and 6-positions are substituted with methyl groups and the 3-positions are unsubstituted hydroxy groups.
Formula I below illustrates the numbering of the hydroxy groups in anhydroglucose units.
Formula I
In one preferred embodiment of the invention hydroxy groups of anhydroglucose units are substituted with methyl groups such that the s23/s26 of the methylcellulose is 0.27 or less, preferably 0.26 or less, more preferably 0.24 or less or even 0.22 or less. In this embodiment of the invention s23/s26 of the methylcellulose preferably is 0.08 or more, 0.10 or more, 0.12 or more, 0.14 or more, 0.16 or more, or 0.18 or more. Methods of making methylcelluloses of this embodiment are described in more detail in the Examples. A general procedure of making methylcelluloses of this embodiment is described in International Patent Applications WO 2013/059064, pages 11 - 12 and WO 2013/059065, pages 11 - 12.
In another preferred embodiment of the invention hydroxy groups of anhydroglucose units are substituted with methyl groups such that the s23/s26 of the methylcellulose is more than 0.27 and up to 0.36, preferably more than 0.27 and up to 0.33, and most preferably more than 0.27 and up to 0.30. Methylcelluloses wherein hydroxy groups of anhydroglucose units are substituted with methyl groups such that s23/s26 is about 0.29 are commercially available
under the trade name METHOCEL SG or SGA (The Dow Chemical Company). They gel at a relatively low temperature, at 38 °C to 44 °C at a concentration of 2 wt. % in water. US Patent No. 6,235,893 teaches the preparation of methylcelluloses of which 1.5 wt. % solutions in water exhibit onset gelation temperatures of 31 - 54 °C, most of them exhibiting gelation temperatures of 35 - 45 °C.
The methylcellulose preferably has a DS(methyl) of from 1.55 to 2.25, more preferably from 1.65 to 2.20, and most preferably from 1.70 to 2.10. The degree of the methyl substitution, DS(methyl), also designated as DS(methoxyl), of a methylcellulose is the average number of OH groups substituted with methyl groups per anhydroglucose unit.
The determination of the % methoxyl in methylcellulose is carried out according to the United States Pharmacopeia (USP 34). The values obtained are % methoxyl. These are subsequently converted into degree of substitution (DS) for methyl substituents. Residual amounts of salt have been taken into account in the conversion.
The viscosity of the methylcellulose is generally at least 2.4 mPa»s, preferably at least 3 mPa»s, and most preferably at least 10 mPa»s, when measured as a 2 wt. % aqueous solution at 5 °C at a shear rate of 10 s"1. The viscosity of the methylcellulose is preferably up to 10,000 mPa»s, more preferably up to 5000 mPa»s, and most preferably up to 2000 mPa»s, when measured as indicated above.
EXAMPLES
Production of Methylcellulose MC-1 to MC-4
Methylcelluloses MC-1 to MC-4 were produced according to the following procedure. Finely ground wood cellulose pulp was loaded into a jacketed, agitated reactor. The reactor was evacuated and purged with nitrogen to remove oxygen, and then evacuated again. The reaction is carried out in two stages. In the first stage, a 50 weight percent aqueous solution of sodium hydroxide was sprayed onto the cellulose until the level reached 1.8 mol of sodium hydroxide per mol of anhydroglucose units of the cellulose, and then the temperature was adjusted to 40 °C. After stirring the mixture of aqueous sodium hydroxide solution and cellulose for about 20 minutes at 40 °C, 1.5 mol of dimethyl ether and 2.3 mol of methyl chloride per mol of anhydroglucose units were added to the reactor. The contents of the reactor were then heated in 60 min to 80 °C. After having reached 80 °C, the first stage reaction was allowed to proceed for 5 min. Then the reaction was cooled down to 65 °C in 20 min.
The second stage of the reaction was started by addition of methyl chloride in an amount of 3.4 molar equivalents of methyl chloride per mol of anhydroglucose unit. The addition time for methyl chloride was 20 min. Then a 50 weight percent aqueous solution of sodium hydroxide at an amount of 2.9 mol of sodium hydroxide per mol of anhydroglucose units was added over a time period of 45 min. The rate of addition was 0.064 mol of sodium hydroxide per mol of anhydroglucose units per minute. After the second-stage addition was completed the contents of the reactor were heated up to 80 °C in 20 min and then kept at a temperature of 80 °C for 120 min.
After the reaction, the reactor was vented and cooled down to about 50 °C. The contents of the reactor were removed and transferred to a tank containing hot water. The crude methylcellulose was then neutralized with formic acid and washed chloride free with hot water (assessed by AgNCb flocculation test), cooled to room temperature and dried at 55 °C in an air-swept drier, and subsequently ground.
The methylcellulose had a DS(methyl) of 1.88 (30.9 wt. methoxyl), a mol fraction (26-Me) of 0.3276 + 0.0039, a mol fraction (23-Me) of 0.0642 + 0.0060, an s23/s26 of 0.20 + 0.02, and a steady- shear-flow viscosity η(5 °C, 10 s"1, 2 wt.% MC) of 5500 mPa»s. The properties of the methylcellulose were measured as described below.
Samples of the produced methylcellulose were partially depolymerized by a known procedure to obtain the methylcelluloses MC-1 to MC-4. Generally speaking, the ground samples are treated with gaseous hydrogen chloride at a temperature of about 85 °C. About
1.5 g gaseous hydrogen chloride per kg of methylcellulose is used. The reaction period is adapted to the desired viscosity. Partial depolymerization of cellulose ethers using gaseous hydrogen chloride is generally known from European patent application EP 1 141 029 and the prior art cited therein. The partial depolymerization does not impact the DS(methyl) or the s23/s26. The properties of the methylcelluloses MC-1 to MC-4 were measured as described below.
Determination of s23/s26 of Methylcellulose
The approach to measure the ether substituents in methylcellulose is generally known. See for example the approach described in principle for Ethyl Hydroxyethyl Cellulose in Carbohydrate Research, 176 (1988) 137-144, Elsevier Science Publishers B.V., Amsterdam, DISTRIBUTION OF SUBSTITUENTS IN 0-ETHYL-0-(2-
HYDROXYETHYL)CELLULOSE by Bengt Lindberg, Ulf Lindquist, and Olle Stenberg.
Specifically, determination of s23/s26 was conducted as follows:
10-12 mg of the methylcellulose were dissolved in 4.0 mL of dry analytical-grade dimethyl sulfoxide (DMSO) (Merck, Darmstadt, Germany, stored over 0.3nm molecular sieve beads) at about 90 °C with stirring and then cooled to room temperature. The solution was stirred at room temperature over night to ensure complete solubilization/dissolution. The entire perethylation including the solubilization of the methylcellulose was performed using a dry nitrogen atmosphere in a 4 mL screw cap vial. After solubilization, the dissolved
methylcellulose was transferred to a 22-mL screw-cap vial to begin the perethylation process. Powdered sodium hydroxide (freshly pestled, analytical grade, Merck, Darmstadt, Germany) and ethyl iodide (for synthesis, stabilized with silver, Merck-Schuchardt, Hohenbrunn, Germany) were introduced in a thirty-fold molar excess relative to the level of
anhydroglucose units in the methylcellulose, and the mixture was vigorously stirred under nitrogen in the dark for three days at ambient temperature. The perethylation was repeated with addition of the threefold amount of the reagents sodium hydroxide and ethyl iodide compared to the first reagent addition, and stirring at room temperature was continued for an additional two days. Optionally, the reaction mixture could be diluted with up to 1.5 mL DMSO to ensure good mixing during the course of the reaction. Next, five mL of 5 % aqueous sodium thiosulfate solution was poured into the reaction mixture, and the mixture was then extracted three times with 4 mL of dichloromethane. The combined extracts were washed three times with 2 mL of water. The organic phase was dried with anhydrous sodium
sulfate (aboutl g). After filtration, the solvent was removed with a gentle stream of nitrogen, and the sample was stored at 4 °C until needed.
Hydrolysis of about 5 mg of the perethylated samples was performed under nitrogen in a 2-mL screw-cap vial with 1 mL of 90 % aqueous formic acid under stirring at 100 °C for 1 hour. The acid was removed in a stream of nitrogen at 35-40 °C and the hydrolysis was repeated with 1 mL of 2M aqueous trifluoroacetic acid for 3 hours at 120 °C in an inert nitrogen atmosphere with stirring. After completion, the acid was removed to dryness in a stream of nitrogen at ambient temperature using ca. 1 mL of toluene for co-distillation.
The residues of the hydrolysis were reduced with 0.5 mL of 0.5-M sodium borodeuteride in 2N aqueous ammonia solution (freshly prepared) for 3 hours at room temperature with stirring. The excess reagent was destroyed by dropwise addition of about 200 μL of concentrated acetic acid. The resulting solution is evaporated to dryness in a stream of nitrogen at about 35-40 °C and subsequently dried in vacuum for 15 min at room temperature. The viscous residue was dissolved in 0.5 mL of 15 % acetic acid in methanol and evaporated to dryness at room temperature. This was done five times and repeated four additional times with pure methanol. After the final evaporation, the sample was dried in vacuum overnight at room temperature.
The residue of the reduction was acetylated with 600 μL of acetic anhydride and 150 μL of pyridine for 3 hrs at 90 °C. After cooling, the sample vial was filled with toluene and evaporated to dryness in a stream of nitrogen at room temperature. The residue was dissolved in 4 mL of dichloromethane and poured into 2 mL of water and extracted with 2 mL of dichloromethane. The extraction was repeated three times. The combined extracts were washed three times with 4 mL of water and dried with anhydrous sodium sulfate. The dried dichloromethane extract was subsequently submitted to GC analysis. Depending on the sensitivity of the GC system, a further dilution of the extract could be necessary.
Gas-liquid (GLC) chromatographic analyses were performed with Agilent 6890N type of gas chromatographs (Agilent Technologies GmbH, 71034 Boeblingen, Germany) equipped with Agilent J&W capillary columns (30 m, 0.25-mm ID, 0.25-μιη phase layer thickness) operated with 1.5-bar helium carrier gas. The gas chromatograph was
programmed with a temperature profile that held constant at 60 °C for 1 min, heated up at a rate of 20 °C / min to 200 °C, heated further up with a rate of 4 °C / min to 250 °C, and heated further up with a rate of 20 °C / min to 310 °C where it was held constant for another 10 min. The injector temperature was set to 280 °C and the temperature of the flame
ionization detector (FID) was set to 300 °C. Exactly ΙμΕ of each sample was injected in the splitless mode at 0.5-min valve time. Data were acquired and processed with a LabSystems Atlas work station.
Quantitative monomer composition data were obtained from the peak areas measured by GLC with FID detection. Molar responses of the monomers were calculated in line with the effective carbon number (ECN) concept but modified as described in the table below. The effective carbon number (ECN) concept has been described by Ackman (R.G. Ackman, J. Gas Chromatogr., 2 (1964) 173-179 and R.F. Addison, R.G. Ackman, J. Gas Chromatogr., 6 (1968) 135-138) and applied to the quantitative analysis of partially alkylated alditol acetates by Sweet et. al (D.P. Sweet, R.H. Shapiro, P. Albersheim, Carbohyd. Res., 40 (1975) 217- 225).
Table 1. ECN increments used for ECN calculations:
In order to correct for the different molar responses of the monomers, the peak areas were multiplied by molar response factors MRFmonomer which are defined as the response relative to the 2,3,6-Me monomer. The 2,3,6-Me monomer were chosen as reference since it was present in all samples analyzed in the determination of s23 / s26.
MRFmonomer = ECN2,3,6-Me / ECNmonomer
The mol fractions of the monomers were calculated by dividing the corrected peak areas by the total corrected peak area according to the following formulas:
(1) s23 is the sum of the molar fractions of anhydroglucose units which meet the following condition [the two hydroxy groups in the 2- and 3 -positions of the anhydroglucose unit are substituted with methyl groups, and the 6-position is not substituted (= 23-Me)]; and (2) s26 is the sum of the molar fractions of anhydroglucose units which meet the following condition [the two hydroxy groups in the 2- and 6-positions of the anhydroglucose unit are substituted with methyl groups, and the 3-position is not substituted (= 26-Me)].
Determination of the DS(methyl) a methylcellulose
The determination of the % methoxyl in methylcellulose was carried out according to the United States Pharmacopeia (USP34). The values obtained were % methoxyl. These were subsequently converted into degree of substitution (DS) for methyl substituents. Residual amounts of salt were taken into account in the conversion.
Solution Preparation
Concentrated polymer solutions were prepared by adding dry cellulose ether powder to water which had an initial temperature of 25 °C while stirring to achieve a good dispersion. The mixture of the MC and water was cooled to 2 °C within 20 minutes while stirring. After the polymer solution reached the temperature of 2 °C, solution preparation was completed by high shear mixing using an immersion mixer for two minutes. Formulations were prepared by mixing the antimicrobial active with a stock solution of fully hydrated cellulose ether polymer and diluting with water to achieve the desired concentrations.
Evaluation of Thermal Gelation
Rheology measurements of aqueous solutions comprising a cellulose ether with and without antimicrobial actives were conducted with an Ares RFS3 rheometer (TA-Instruments) with cup and bob fixtures. Seventeen milliliters of solution were transferred to the cup fixture and the gap set to 5 mm. The sample was heated at a rate of 1°C per minute over a temperature range from 10 to 50 °C with a constant strain of 2% and a constant angular frequency of 5 radians per second. The viscosity at 20°C and 37°C are presented to indicate the increase in viscosity when exposed to a warm surface. The cross over point of G' and G" is defined as the temperature at which the curves intersect.
Efficacy Testing
Model substrates tested include chicken skin and slices of beef. Substrates were mounted on an aluminum pan and incubated in sealed container at 37C, only removing from the incubator to apply solutions. An area of approximately 10 cm2 was inoculated with 1 mL of E. coli ATCC 11303 culture, from a stock culture grown overnight in Difco media to about 1 x 108 CFU per ml.. The culture was allowed to incubate on the surface for 30 minutes, any excess was then allowed to drip from the surface while the sample was held vertical prior to the same area beingsprayed with 600 microliters of formulation. In each example one sample is included that was inoculated with bacteria but no formulation applied, labeled as the control.
During spray application and during the following incubation the sample was held vertical to allow dripping of non-gelled solution. Two hours after application of the formulation samples were removed using a 5 mm biopsy punch. Samples were vortexed in 1 mL of peptone buffered water to retrieve bacteria, followed by serial dilution and plating on eosin methylene blue (EMB) agar plates for quantification of surviving bacteria. Results are reported in log CFU per cm2. All trials included a control sample that inoculated with bacteria but no antimicrobial solutions were applied. All formulations containing antimicrobial and polymer were compared to the sample containing antimicrobial with no polymer to evaluate the significance of the gelling polymer in efficacy. Data sets were compared using the Tukey Kramer method for comparing means, and all references to significance are regarding a statistical significance with a p value lower than 0.05.
Materials
The following Polymers were utilized in the examples. The steady-shear-flow viscosity h(5 °C, 10 s"1, 2 wt. MC) of an aqueous 2-wt. methylcellulose solution was measured at 5 °C at a shear rate of 10 s"1 with an Anton Paar Physica MCR 501 rheometer and cup and bob fixtures.
Table 1. Polymer Properties
Cetyl Pyridinium Chloride (CPC) on Chicken Skin: Solutions containing MC-1 with CPC and propylene glycol (PG) exhibit gelation within the desired range with the control sample containing a convention polymer of equivalent molecular weight (Methocel E3) does not. The gelling solution results in a significantly greater reduction in bacteria than the solution containing the non-gelling polymer.
Table 3. CPC on Chicken Skin Efficacy and Gelation Properties
aterial gelled - not an accurate viscosity reading, but indicates gelation
Table 4. Efficacy Testing Results of CPC on Chicken Skin
Lactic acid on chicken skin demonstrating medium and high viscosity polymers: Solutions containing medium viscosity (MC-2) and high viscosity (MC-3) polymers demonstrate gelation in the desired range while conventional polymers of equivalent viscosity do not. Both the solution containing 2% lactic acid with either 2% MC-2 or 1% MC-3 demonstrated a significantly greater reduction in bacteria than the sample containing 2% lactic acid with no polymer.
Table 5. Lactic Acid on Chicken Skin Efficacy and Gelation Properties
. Material gelled - not an accurate viscosity reading, but indicates gelation
Table 6. Efficacy Testing of Lactic Acid on Chicken Skin
Lactic acid on chicken demonstrating polymer concentration comparison: The effect of polymer concentration on gelation temperature and efficacy was demonstrated using the low viscosity polymer MC-1. A solution containing 1% polymer exhibits gelation above the target temperature of 37C and does not result in increased efficacy. The solutions containing 2% lactic acid with 3% MC-1, 5% MC-1, or 8% MC-1 all resulted in significantly greater reduction in bacteria when compared to the solution of 2% lactic acid with no polymer.
Table 7. Effect of Polymer Concentration on Efficacy and Gelation Properties
1. Material gelled - not an accurate viscosity reading, but indicates gelation
Table 8. Efficacy Testing Results of Effect of Polymer Concentration
4. Lactic acid solution on chicken skin demonstrating gelling vs. non-gelling polymers: The advantage of a gelling polymer solution compared to a non-gelling was evaluated comparing MC-1 to an equivalent viscosity grade conventional polymer. The gelling polymer exhibited gelation prior to 37°C and resulted in greater bacterial reduction than the conventional, which did not gel at the desired temperature. The gelling solution containing 2% lactic acid and 5% MC-1 resulted in a significantly greater reduction in bacteria than the 2% lactic acid solution with no polymer.
Table 9. Gelling vs. Non-gelling Formulation Efficacy and Gelation Properties
Material gelled - not an accurate viscosity reading, but indicates gelation
Table 10. Efficacy Testing Results of Gelling vs. Non-gelling Formulations
Laurie Arginate on chicken skin: Increased efficacy of a solution containing a gelling polymer was demonstrated. The reduction in bacteria was significantly greater for the solution containing 0.5% lauric arginate with 5% MC-1 when compared to that containing only 0.5% lauric arginate with no polymer.
Table 11. Lauric Arginate on Chicken Skin Efficacy and Gelation Properties
Material gelled - not an accurate viscosity reading, but indicates gelation
Table 12. Efficacy Testing Results of Laurie Arginate on Chicken Skin
Lactic Acid on Beef: The advantage of a gelling polymer was demonstrated using beef as a substrate. The gelling solution containing 2% lactic acid and 8% MC-1 resulted in significantly greater reduction than the solution containing 2% lactic acid with no polymer.
7. Table 13. Lactic Acid on Beef Efficacy and Gelation Properties
aterial gelled - not an accurate viscosity reading, but indicates gelation
Table 14. Efficacy Testing Results of Lactic Acid on Beef
Gelling Peptide Formulations: Solutions containing nisin and gelling polymer exhibited gelation within the desired temperature range. Gelled solutions will increase residence time on a food surface and increase efficacy.
Table 15. Gelation Properties of Nisin Formulations
1. Material gelled - not an accurate viscosity reading, but indicates gelation
9. Control of Gelation
CPC/propylene glycol increase the gelation temperature of the 3% MC-1 solution by 8 degrees. An equivalent solution prepared in phosphate buffered saline returns the gelation temperature to 30°C, and in a 2% solution of sodium chloride is depressed even lower to 28°C. Addition of a gelation temperature additive such as a salt or buffer, or increased polymer concentration, can be used to offset the addition of a gel temp increasing active ingredient.
Table 16. Formulation Approaches to Controlling Gelation
1. Material gelled - not an accurate viscosity reading, but indicates gelation
Claims
1. A method for reducing or inhibiting bacterial contamination on a food surface; said method comprising applying to the food surface a quaternary ammonium salt and a methylcellulose, wherein
the methylcellulose has anhydroglucose units joined by 1-4 linkages wherein hydroxy groups of anhydroglucose units are substituted with methyl groups such that s23/s26 is 0.36 or less,
wherein s23 is the molar fraction of anhydroglucose units wherein only the two hydroxy groups in the 2- and 3 -positions of the anhydroglucose unit are substituted with methyl groups and
wherein s26 is the molar fraction of anhydroglucose units wherein only the two hydroxy groups in the 2- and 6-positions of the anhydroglucose unit are substituted with methyl groups.
2. The method of claim 1 in which the food surface is an animal carcass at a temperature from 30 to 40°C.
3. The method of claim 2 in which s23/s26 is 0.27 or less.
4. The method of claim 3 in which the methylcellulose is applied in a liquid carrier at a concentration from 0.5 to 10 wt .
5. The method of claim 4 in which the methylcellulose and the quaternary ammonium salt are present in a single liquid carrier.
6. The method of claim 5 in which the animal carcass is a beef or chicken carcass.
7. The method of claim 6 in which s23/s26 is from 0.14 to 0.26.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/325,761 US20170156380A1 (en) | 2014-07-16 | 2015-07-06 | Method for treating food surfaces with quaternary ammonium salts |
EP15742160.3A EP3169685A1 (en) | 2014-07-16 | 2015-07-06 | Method for treating food surfaces with quaternary ammonium salts |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201462025253P | 2014-07-16 | 2014-07-16 | |
US62/025,253 | 2014-07-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2016010755A1 true WO2016010755A1 (en) | 2016-01-21 |
Family
ID=53724459
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2015/039180 WO2016010755A1 (en) | 2014-07-16 | 2015-07-06 | Method for treating food surfaces with quaternary ammonium salts |
Country Status (4)
Country | Link |
---|---|
US (1) | US20170156380A1 (en) |
EP (1) | EP3169685A1 (en) |
AR (1) | AR101100A1 (en) |
WO (1) | WO2016010755A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016168560A1 (en) | 2015-04-16 | 2016-10-20 | Kennesaw State University Research And Service Foundation, Inc. | Escherichia coli o157:h7 bacteriophage φ241 |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3351652A (en) * | 1963-10-28 | 1967-11-07 | Millmaster Onyx Corp | Quaternary ammonium compounds |
US6235893B1 (en) | 1999-04-01 | 2001-05-22 | The Dow Chemical Company | Process for making cellulose ether having enhanced gel strength |
EP1141029A1 (en) | 1998-12-01 | 2001-10-10 | The Dow Chemical Company | Process and apparatus for making cellulose ethers |
US20020015697A1 (en) * | 2000-03-13 | 2002-02-07 | Kenneth Beckman | Biocidal methods and compositions |
US20070087093A1 (en) * | 2003-06-12 | 2007-04-19 | Koefod Robert S | Antimicrobial salt solutions for food safety applications |
US20090246336A1 (en) | 2008-03-25 | 2009-10-01 | Ecolab Inc. | Bacteriophage treatment for reducing and preventing bacterial contamination |
WO2013059065A1 (en) | 2011-10-19 | 2013-04-25 | Dow Global Technologies Llc | Methods and compositions for inducing satiety |
WO2013059064A1 (en) | 2011-10-19 | 2013-04-25 | Dow Global Technologies Llc | Methods and compositions for inducing satiety |
-
2015
- 2015-07-02 AR ARP150102129A patent/AR101100A1/en unknown
- 2015-07-06 US US15/325,761 patent/US20170156380A1/en not_active Abandoned
- 2015-07-06 WO PCT/US2015/039180 patent/WO2016010755A1/en active Application Filing
- 2015-07-06 EP EP15742160.3A patent/EP3169685A1/en not_active Withdrawn
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3351652A (en) * | 1963-10-28 | 1967-11-07 | Millmaster Onyx Corp | Quaternary ammonium compounds |
EP1141029A1 (en) | 1998-12-01 | 2001-10-10 | The Dow Chemical Company | Process and apparatus for making cellulose ethers |
US6235893B1 (en) | 1999-04-01 | 2001-05-22 | The Dow Chemical Company | Process for making cellulose ether having enhanced gel strength |
US20020015697A1 (en) * | 2000-03-13 | 2002-02-07 | Kenneth Beckman | Biocidal methods and compositions |
US20070087093A1 (en) * | 2003-06-12 | 2007-04-19 | Koefod Robert S | Antimicrobial salt solutions for food safety applications |
US20090246336A1 (en) | 2008-03-25 | 2009-10-01 | Ecolab Inc. | Bacteriophage treatment for reducing and preventing bacterial contamination |
WO2013059065A1 (en) | 2011-10-19 | 2013-04-25 | Dow Global Technologies Llc | Methods and compositions for inducing satiety |
WO2013059064A1 (en) | 2011-10-19 | 2013-04-25 | Dow Global Technologies Llc | Methods and compositions for inducing satiety |
Non-Patent Citations (4)
Title |
---|
BENGT LINDBERG; ULF LINDQUIST; OLLE STENBERG: "DISTRIBUTION OF SUBSTITUENTS IN O-ETHYL-O-(2-HYDROXYETHYL)CELLULOSE", vol. 176, 1988, ELSEVIER SCIENCE PUBLISHERS, article "Ethyl Hydroxyethyl Cellulose in Carbohydrate Research", pages: 137 - 144 |
D.P. SWEET; R.H. SHAPIRO; P. ALBERSHEIM, CARBOHYD. RES., vol. 40, 1975, pages 217 - 225 |
R.F. ADDISON; R.G. ACKMAN, J. GAS CHROMATOGR., vol. 6, 1968, pages 135 - 138 |
R.G. ACKMAN, J. GAS CHROMATOGR., vol. 2, 1964, pages 173 - 179 |
Also Published As
Publication number | Publication date |
---|---|
EP3169685A1 (en) | 2017-05-24 |
US20170156380A1 (en) | 2017-06-08 |
AR101100A1 (en) | 2016-11-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20180027829A1 (en) | Material for packaging comprising antimicrobial composition | |
Marcos et al. | Use of antimicrobial biodegradable packaging to control Listeria monocytogenes during storage of cooked ham | |
US6172040B1 (en) | Immobilized lactoferrin antimicrobial agents and the use thereof | |
Dickson | Acetic acid action on beef tissue surfaces contaminated with Salmonella typhimurium | |
Khanjari et al. | Combined effect of N, O-carboxymethyl chitosan and oregano essential oil to extend shelf life and control Listeria monocytogenes in raw chicken meat fillets | |
Molla et al. | Multiple antimicrobial-resistant Salmonella serotypes isolated from chicken carcass and giblets in Debre Zeit and Addis Ababa, Ethiopia | |
TW201708430A (en) | Material for packaging comprising antimicrobial composition | |
Raeisi et al. | Antimicrobial resistance and virulence-associated genes of Campylobacter spp. isolated from raw milk, fish, poultry, and red meat | |
Jonker et al. | Antimicrobial susceptibility in thermophilic Campylobacter species isolated from pigs and chickens in South Africa | |
US20180035664A1 (en) | Material for packaging comprising antimicrobial composition | |
Alfaifi et al. | Suppressing of milk-borne pathogenic using new water-soluble chitosan-azidopropanoic acid conjugate: Targeting milk-preservation quality improvement | |
WO2008028278A1 (en) | Antimicrobial coatings | |
WO2016010751A1 (en) | Method for treating food surfaces with bacteriophages | |
EP3169168B1 (en) | Method for treating food surfaces with amino acid esters | |
EP3169169B1 (en) | Method for treating food surfaces with antimicrobial acids | |
WO2016010755A1 (en) | Method for treating food surfaces with quaternary ammonium salts | |
AU2021106590A4 (en) | Thixotropic antimicrobial composition | |
GONCAGÜL et al. | Prevalence of Salmonella serogroups in chicken meat | |
CN101652144B (en) | External animal layer sanitation using bacteriophage | |
EA005521B1 (en) | A concentrated non-foaming solution of quaternary ammonium compounds and methods of use | |
WO2016010754A1 (en) | Method for treating food surfaces with peptides | |
Ganan et al. | Inhibition by yeast-derived mannoproteins of adherence to and invasion of Caco-2 cells by Campylobacter jejuni | |
US20030068968A1 (en) | Method of sterilizing poultry meat | |
Xie et al. | Research progress on the harmful factors of fermented meat products and control measures against them. | |
Beterams et al. | Status quo: Levels of Campylobacter spp. and hygiene indicators in German slaughterhouses for broiler and turkey |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 15742160 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 15325761 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
REEP | Request for entry into the european phase |
Ref document number: 2015742160 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2015742160 Country of ref document: EP |