CN102212209A - Packaging film for refrigerated foods and preparation method thereof - Google Patents
Packaging film for refrigerated foods and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a packaging film for refrigerated foods and a preparation method thereof. The packaging film is characterized by being made of bacteria cellulose gel containing an antibacterial component, i.e., lysine. The preparation method of the packaging film for refrigerated foods comprises the steps of: (1) purification of the bacteria cellulose gel; (2) preparation of an antibacterial solution; and (3) adsorption and immobilization of the antibacterial component. The packaging film for refrigerated foods is nontoxic and harmless so that the film can be directly eaten together with foods, has excellent air permeation and protection effects, especially an excellent effect in suppressing the growth of LM (Listeria monocytogenes), and can also adsorb other antibacterial components considerably in order to effectively suppress the propagation of harmful bacteria and prolong the shelf life of foods.
Description
Technical field
The present invention relates to food processing field, more particularly relate to a kind of not only direct-edible, and while can suppress refrigerated food packing film of harmful microorganism growth and breeding in the refrigerated food and preparation method thereof.
Background technology
(L.monocytogenes LM) is a kind of in the listeria (Listeria) to listeria monocytogenes, and LM is distributed widely in nature, can both detect meat, eggs, bird, sea-food, milk-product and greengrocery.Listeria (Listeria) now is divided into 2 groups 7 kinds, is respectively listeria monocytogenes (L.monocytogenes LM) (also claiming Listeria monocytogenes), listeria ivanovii (L.ivanovii) (also claiming the sheep listeria bacteria), Ying Nuoke listeria bacteria (L.innocua) (also claiming listera innocua), Webster listeria bacteria (L.welshimei), Sai Shi listeria bacteria (L.seeligeri), listeria grayi (L.gmyi) and Mohs listeria bacteria (L.murmyi).Wherein LM is the important pathogenic bacteria that causes animal and human's class disease.LM is the strongest bacterium of virulence in the listeria, also be find so far unique can morbific to the people, typical born of the same parents' endophyte, can be in scavenger cell, epithelial cell, endotheliocyte and liver cell internal breeding.LM can cause humans and animals trouble meningitis, encephalitis, septicemia, endocarditis, miscarriage, abscess and the damage of partial purulence, can cause diseases such as the pregnant woman miscarries, stillborn foetus, sends out patient's mortality ratio and can reach 20%～70%.It mainly is newborn infant, pregnant woman, the elderly and immunologic hypofunction person that human listeriosis infects object, and immune normal population seldom infects LM.LM still can growth and breeding under 4 ℃ environment, is the main important pathogenic bacteria that refrigerated food threatens human health.In recent years, the LM disease often has generation in American-European countries, once repeatedly caused food poisoning in states such as France, the U.S., Canada and Germany, the lighter is general gastro-enteritis symptom, severe person mainly shows as septicemia, meningitis, nervous symptoms and monocytosis etc., and the clinically dead rate is up to 20%～70%.The WHO statistical information shows that the morbidity U.S. of every million people LM is 8.3, and France is 8.0, and Australia is 7.6, and Britain is 5.0, and Japan is 0.2.According to another the data of U.S. disease prevention and control center (CDC), the U.S. has the sick generation of 1600～2000 routine LM, dead about 450 people every year approximately.
Since November calendar year 2001, China's quality testing department repeatedly detects LM from more than 30 batch of nearly kiloton pig byproducts such as the Pigs Kidney of more than 20 tame meat packing plants such as the U.S., Canada, France, Ireland, Belgium, Denmark import, pig ear, pork tripe, float.In March, 1997 and August, successively people and animals' unknown cause illness outbreak of twice occurrence of large-area is popular in one natural village, Yunnan Province of China province county, through looking into to due to the LM.Twice epidemic period, draught animal is almost all dead in the village, wherein ox morbidity 71.04%, pig morbidity 72.01%, sheep morbidity 36.13%, the animal case fatality rate almost reaches 100%, and crowd's sickness rate is respectively 8.2% and 8.6%.
Listeria bacteria adaptive capacity to environment outside is strong, to unfavorable factor such as low temperature, height ooze, antimicrobial substance has resistivity, can also form microbial film at body surface.Report is arranged, and 4%～8% fishery products, 5%～10% milk and milk preparation, the meat product more than 30%, the poultry more than 15% can be by this fungi pollution, instant food and refrigerating food vulnerable to pollution.Investigation such as 2004～2005 years Cui Jing brightness Beijing 8 based foods, 270 duplicate samples, detect LM 58 strains, average recall rate is 21.5%, wherein the cooked meat product recall rate is up to 48%, the raw meat recall rate is 18.3%, eating the vegetables recall rate raw is 20%, and the fishery products recall rate is 16%, and the ice-creams recall rate is 2.2%.
LM can have cold-resistant characteristic in the growth of general refrigerator refrigerating chamber, is one of important pathogenic bacteria of refrigeration drink food poisoning.WHO has listed the listeria bacteria in food four big pathogenic bacterias.But,,, need carry out from a plurality of links so the preventing infection of this bacterium is the problem that is difficult to solution because the listeria bacteria is extensive in distributed in nature.At first be exactly strict control food raw material, especially easily infected meat, fishery products and dairy products etc. answer emphasis to prevent its superinfection in intermediate links and storage link.
Wrapping material that meat product uses are varied at present, mainly contain natural casing, plastic casing, metal tin and glass pot etc.Natural casing is that the intestines with animal process, and it has ventilation property, elasticity preferably, and is also direct-edible, but its specification disunity, mechanical bad adaptability, and itself be exactly the good environment of microorganism growth, so it is contaminated easily; Plastic casing mainly comprises polyvinylidene dichloride casing, nylon casing (polymeric amide casing), polymkeric substance casing (as polyester) etc., though but plastic casing has preferable performance, but its anorexia usefulness, and certain toxic action is arranged, be that human consumer institute is not acceptant; And metal tin and glass pot are with high costs, use inconvenience.At present, do not have a kind of meat wrapping film product that can directly eat and have excellent machinability and fresh-keeping effect.Except that meat product, also have a lot of cryopreservation food, as fishery products, milk preparation etc., also supply after processing mostly often can not in time consume after the human consumer buys it and it is stored in the home freezer, then be easy to infect the LM bacterium once more, cause unnecessary illness at storage period.So be badly in need of a kind of method that under low temperature environment, still can suppress the LM bacteria growing.
Summary of the invention
Purpose of the present invention promptly provides a kind of packing film that is exclusively used in refrigerated food, and it can be under low temperature environment, in food circulation and storage link, and the growth of LM bacterium in the long term inhibition food raw material, and prevent the superinfection of LM bacterium.
In order to achieve the above object, the technical solution used in the present invention is: a kind of packing film that is used for refrigerated food, it is made by bacterial cellulose gel, contains antimicrobial component Buddhist nun suffering in the described bacterial cellulose gel.Bacteria cellulose (BC) is meant under different condition, by the cellulosic general designation of certain microorganism synthetic in acetic acid Pseudomonas (Acetobacter), Agrobacterium (Agrobacterium), rhizobium (Rhizobium) and the Sarcina (Sarcina) etc.It is nontoxic, and is direct-edible, and has ventilation property and machining property preferably.
The present invention adopts the bacterial classification that can produce bacteria cellulose by fermented-producing bacteria cellulose, generates the bacterial cellulose gel mycoderm at the fermentation culture primary surface, is extraordinary carrier after alkaline purification, can the active adsorption active substance.And Buddhist nun's suffering (Nisin, claim nisin again) be a kind of efficient, nontoxic, the safety that produces by streptococcus acidi lactici, the antiseptics for natural food of nutrition, can suppress many growth, breedings that cause the gram-positive microorganism of food spoilage consumingly, and to the human body safety non-toxic.Ni Xin can not caused the resistance problem that the picture common antibiotics occurs by the Quimotrase enzymolysis soon in human body alimentary canal, can not change the normal microflora in the human intestinal yet.
Both organically combine with this in the present invention, explore its actual bacteriostatic activity, obtained a kind of can be at the film product that can be used for the refrigerated food packing of long term inhibition microorganism under the low temperature environment especially listeria growth, it also can directly eat simultaneously, is good food fibre source.
The bacterial classification that the present invention produces bacterial cellulose gel is preferably acetobacter xylinum or gluconate pyracetobacillus.
Packing film of the present invention, wherein said bacterial cellulose gel preferably soaked in the dilute hydrochloric acid solution that contains 600～10000IU/ml Buddhist nun suffering 6～24 hours.The hot content 2500IU/ml of preferred Buddhist nun.
Packing film of the present invention wherein can also add the oxalic acid tetrem acyl salt (edta salt) of mass concentration 0.05～0.3% and the tea-polyphenol of mass concentration 0.02～0.1% in dilute hydrochloric acid solution.
Strengthen antibacterial effect.Oxalic acid tetrem acyl salt (edta salt) is safe foodstuff additive, and it can suppress oxidation tint change of meat product etc.; Tea-polyphenol is the general name of polyphenols in the tealeaves, mainly comprises flavanol compound, anthocyanin class, flavonoid, flavones alkanes and phenolic acid etc., and it can prevent greasy qualitative change corruption, and has certain health-care effect.Add these two kinds of materials and can suppress a greater variety of harmful microbe growths.The concentration of described dilute hydrochloric acid solution is 0.005～0.01mol/L.Described oxalic acid tetrem acyl salt mass concentration is preferably 0.1%, and the tea-polyphenol mass concentration is preferably 0.05%.Described oxalic acid tetrem acyl salt is oxalic acid tetrem acyl disodium (EDTA disodium) or oxalic acid tetrem acyl four sodium (EDTA four sodium).
The above-mentioned preparation method who is used for the packing film of refrigerated food may further comprise the steps:
(1) purification of bacterial cellulose gel: use the washed with de-ionized water bacterial cellulose gel, in the NaOH of 0.3～0.4mol/L solution, soaked 2～5 hours again, soaking temperature is 60～80 ℃, again with 3～5 extremely neutral getting final product of deionized water repetitive scrubbing bacterial cellulose gel;
(2) preparation antiseptic solution: Buddhist nun's suffering is dissolved in the dilute hydrochloric acid solution of 0.005～0.01mol/L and makes antiseptic solution;
(3) absorption of antimicrobial component and fixing: the bacterial cellulose gel behind the purifying was soaked in antiseptic solution 6～24 hours; After immersion is finished bacterial cellulose gel is taken out, after washed with de-ionized water, in mass concentration is 10～15% glycerine solution, soaked 15～20 minutes again; Take out the back cryodrying, drying temperature is 50～70 ℃, preferred 60 ℃.
Also comprise the size of packaged products as required in the aforesaid method, bacterial cellulose gel is cut into the step of different size.
The packing film that is used for refrigerated food that adopts the method among the present invention to make, nontoxic, can be together directly edible with food, and have high ventilation, provide protection especially has the effect of good restraining LM bacteria growing; This packing film can also adsorb other antimicrobial components in a large number in addition, can effectively suppress the breeding of harmful bacterium, prolongs the quality guaranteed period of food.
Embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is described in further detail.Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
As a kind of preferred implementation, the production method of the bacterial cellulose gel that relates among the following embodiment is as follows:
(1) activation bacteria cellulose fermentative production bacterial strain gluconate pyracetobacillus, preparation fermentative production seed liquor: the seed liquid nutrient medium contains N.F,USP MANNITOL 25g/l, yeast extract 5g/l, peptone 3g/l, per 1 liter is shaken dress 500ml liquid nutrient medium in the bottle, and 180 commentaries on classics, 30 degree are cultivated 24h down and got seed liquor;
(2) 10% inoculum size adds seed liquor in the fermention medium by volume, and described fermention medium contains Sucus Cocois 1000g, adds 50g yeast extract paste, 20gKH
2PO
4, 20gMgSO
4, 200g sucrose, stir and make liquid fermentation medium;
(3) 30 ℃, leave standstill in the 250ml culture plate and cultivated 4 days;
(4) remove the first layer mycoderm that media surface forms, continue to cultivate under these conditions 2 days, collect the second layer mycoderm that forms, in the NaOH of 0.3mol/L solution, soaked 5 hours again in 60 ℃, use deionized water repetitive scrubbing bacterial cellulose gel film 3 times again, rinsing is to neutral, and the bacterial cellulose gel film that obtains the about 1-2mm of thickness is standby.Can cut into the different size size on demand.
Embodiment one:
The bacterial cellulose gel film for preparing is cut into the circular size of diameter 22mm, be immersed in the hot solution of Buddhist nun 12 hours under 4 ℃, the back is taken out and use washed with de-ionized water, immerses mass concentration more fast and be taking-up again in 15% the glycerine solution, 50 ℃ of dryings.
Wherein, the preparation method of the hot solution of Buddhist nun is as follows: 0.5g Buddhist nun's suffering (SIGMA company) is dissolved in the dilute hydrochloric acid solution that 10ml concentration is 0.01mol/L, prepare the hot solution of Buddhist nun of 50000IU/ml, 4 ℃ go out to be in store for, and it are dissolved in the 0.01mol/L dilute hydrochloric acid solution by desired concn when needing again.
The bacteria cellulose mycoderm that soaks in the 0.01mol/L dilute hydrochloric acid solution in contrast.
Listeria monocytogenes (L.monocytogenes, LM) (Institute of Microorganism, Academia Sinica) is cultured to logarithmic phase with TSB substratum (sea, Qingdao is rich biological), change high speed centrifugation for 4 ℃, 10000 and collect thalline, be suspended in 0.1% peptone buffer agent, be concentrated into 10
6CFU/ml.Slowly add the TSA substratum of 45 ℃ of agar contents that melted 1% in the suspension, inject culture dish then, cooling.The above-mentioned bacteria cellulose film that contains Buddhist nun's suffering for preparing (diameter 22mm) is put into culture dish, cultivate 24h for 30 ℃, observe the film size of inhibition zone on every side, to determine bacteriostatic activity.The hot solution fungistatic effect of the Buddhist nun of different concns is as shown in table 1 below:
Table 1: the hot solution fungistatic effect of the Buddhist nun of different concns table
| The hot solution (IU/ml) of Buddhist nun | Antibacterial circle diameter size (mm) |
| 150 | 22 |
| 300 | 22 |
| 600 | 23 |
| 1200 | 23.5 |
| 2500 | 24 |
| 5000 | 24.3 |
| 10000 | 25.8 |
As can be drawn from Table 1, when the hot strength of solution of Buddhist nun is higher than 600IU/ml the listeria bacteria there is obvious fungistatic effect, along with the rising bacteriostatic activity of concentration is high more, but after being higher than 2500IU/ml, the rising of fungistatic effect is not clearly, so select the hot solution of the Buddhist nun of 2500IU/ml the most suitable.
Investigated soak time simultaneously, adopted bacterial cellulose gel to soak different time respectively in the hot solution of the Buddhist nun of 600IU/ml, fungistatic effect is as shown in table 2:
Table 2: bacterial cellulose gel is at the hot solution of the Buddhist nun of same concentration
The middle fungistatic effect table that soaks different time
| Soak time (h) | Antibacterial circle diameter size (mm) |
| 0 | 22 |
| 2 | 22 |
| 4 | 22 |
| 6 | 23 |
| 8 | 23 |
| 10 | 23.2 |
| 12 | 22.8 |
As can be drawn from Table 2, soak time can reach best fungistatic effect in 10 hours, more for a long time immersion also can, but fungistatic effect is not had help.
Embodiment two:
Buy the vacuum-packed cooked meat product on fresh date from local supermarket, under aseptic technique, remove original packing, containing 10 then
6Soaked 2 seconds in the salt brine solution of CFU/ml LM bacterium, contain Ni Xin (600IU/ml or 2500IU/ml with preparation as stated above after the evaporating water, soaked 6 hours) the bacteria cellulose film monolayer package, do not contain the bacteria cellulose film monolayer package of Buddhist nun's suffering and common plastics casing monolayer package respectively in contrast.
Above-mentioned packing film is all vacuum-packed.4 ℃ of following preservations, sampling in per 2 days detects.
Adopt colony counting method to measure LM bacterium number.
Measurement result is as shown in table 3:
Table 3: adopt colony counting method to measure the LM bacterium and count table as a result
As can be drawn from Table 3, the bacteria cellulose packing film of the Buddhist nun's of containing suffering of the present invention has tangible fungistatic effect to LM bacterium in the cooked meat product, harmful microbe growth and breeding in its food that can effectively prevent to preserve under 4 ℃ of cold condition.
Embodiment three:
Prepare the bacterial cellulose gel film as stated above; Buddhist nun's suffering, oxalic acid tetrem acyl disodium and tea-polyphenol are dissolved in the dilute hydrochloric acid solution of 0.005mol/L and make antiseptic solution, the concentration of Buddhist nun's suffering is 2500IU/ml in the antiseptic solution, the concentration of oxalic acid tetrem acyl disodium in solution is 0.2%, and the concentration of tea-polyphenol in solution is 0.05%.The bacteria cellulose film was soaked in antiseptic solution 10 hours; After immersion is finished the bacteria cellulose film is taken out, after washed with de-ionized water, in concentration is 10% glycerine solution, soaked 15 minutes again; Take out back 50 ℃ of cryodryings.
Embodiment four:
Prepare the bacterial cellulose gel film as stated above; Buddhist nun's suffering, oxalic acid tetrem acyl disodium and tea-polyphenol are dissolved in the dilute hydrochloric acid solution of 0.007mol/L and make antiseptic solution; The concentration of Buddhist nun's suffering is 1250IU/ml in the antiseptic solution, and the concentration of oxalic acid tetrem acyl disodium in solution is 0.05%, and the concentration of tea-polyphenol in solution is 0.1%.The bacteria cellulose film was soaked in antiseptic solution 8 hours; After immersion is finished the bacteria cellulose film is taken out, after washed with de-ionized water, in concentration is 12% glycerine solution, soaked 18 minutes again; Take out back 60 ℃ of cryodryings.
Embodiment five:
Prepare the bacterial cellulose gel film as stated above; Buddhist nun's suffering, oxalic acid tetrem acyl disodium and tea-polyphenol are dissolved in the dilute hydrochloric acid solution of 0.01mol/L and make antiseptic solution; The concentration of Buddhist nun's suffering is 600IU/ml in the antiseptic solution, and the concentration of oxalic acid tetrem acyl disodium in solution is 0.3%, and the concentration of tea-polyphenol in solution is 0.1%.The bacteria cellulose film was soaked in antiseptic solution 6 hours; After immersion is finished the bacteria cellulose film is taken out, after washed with de-ionized water, in concentration is 15% glycerine solution, soaked 20 minutes again; Take out back 70 ℃ of cryodryings.
Get packing film product that embodiment three, four, five makes and pack sausage goods in the cooked meat product respectively under aseptic condition, preservation under 4 ℃ of refrigerated conditions detects its total viable count every sampling in 3 days, and original packing product measurement result in contrast is as shown in table 4:
Packing film product that table 4: embodiment three, four, five makes and original packing product be the measurement result table in contrast
As can be drawn from Table 4, packing film of the present invention can effectively suppress the microbial growth breeding, can significantly reduce the ill probability that microbial contamination causes in the food refrigerated process.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. one kind is used for packing film of refrigerated food and preparation method thereof, it is characterized in that: described packing film is made by bacterial cellulose gel, contains antimicrobial component Buddhist nun suffering in the described bacterial cellulose gel.
2. packing film that is used for refrigerated food according to claim 1 and preparation method thereof is characterized in that: described bacterial cellulose gel soaked in the dilute hydrochloric acid solution that contains 600～10000IU/ml Buddhist nun suffering 6～24 hours.
3. packing film that is used for refrigerated food according to claim 2 and preparation method thereof is characterized in that: the preferred 2500IU/ml of the hot content of described Buddhist nun.
4. packing film that is used for refrigerated food according to claim 2 and preparation method thereof is characterized in that: also contain mass concentration in the described dilute hydrochloric acid solution and be 0.05～0.3% the oxalic acid tetrem acyl salt and the tea-polyphenol of mass concentration 0.02～0.1%.
5. packing film that is used for refrigerated food according to claim 4 and preparation method thereof is characterized in that: described oxalic acid tetrem acyl salt mass concentration is 0.1%, and the tea-polyphenol mass concentration is 0.05%.
6. according to claim 2 or 4 each, described packing film that is used for refrigerated food and preparation method thereof is characterized in that: the concentration of described dilute hydrochloric acid solution is 0.005～0.01mol/L.
7. according to claim 4 or 5 described packing films that are used for refrigerated food and preparation method thereof, it is characterized in that: described oxalic acid tetrem acyl salt is oxalic acid tetrem acyl disodium or oxalic acid tetrem acyl four sodium.
8. described packing film that is used for refrigerated food of claim 1 and preparation method thereof is characterized in that may further comprise the steps:
(1) purification of bacterial cellulose gel: use the washed with de-ionized water bacterial cellulose gel, bacterial cellulose gel was soaked 2～5 hours in the NaOH of 0.3～0.4mol/L solution, soaking temperature is 60～80 ℃, again with 3～5 extremely neutral getting final product of deionized water repetitive scrubbing bacterial cellulose gel;
(2) preparation antiseptic solution: Buddhist nun's suffering is dissolved in the dilute hydrochloric acid solution of 0.005～0.01mol/L and makes antiseptic solution;
(3) absorption of antimicrobial component and fixing: the bacterial cellulose gel behind the purifying was soaked in antiseptic solution 6～24 hours; After immersion is finished bacterial cellulose gel is taken out, after washed with de-ionized water, soaked 15～20 minutes in mass concentration is 10～15% glycerine solution, take out the back cryodrying, drying temperature is 50～70 ℃.
9. packing film that is used for refrigerated food according to claim 8 and preparation method thereof is characterized in that: preferred 60 ℃ of the drying temperature in the described step (3).
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| CN103989190A (en) * | 2014-06-06 | 2014-08-20 | 海南椰国食品有限公司 | Method for preparing low-temperature meat paste product |
| CN104629279A (en) * | 2015-02-03 | 2015-05-20 | 安徽民祯生物工程有限公司 | Bacteriocin bacteriostatic fresh-keeping biological composite film |
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| CN105885075A (en) * | 2016-04-06 | 2016-08-24 | 洪思仪 | Preparation method of quasi-chitosan anti-bacterial nanobacterium cellulose |
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| CN103385896A (en) * | 2013-07-23 | 2013-11-13 | 钟春燕 | Preparation method of bacterial cellulose composite flavonoid compound |
| CN103385896B (en) * | 2013-07-23 | 2015-03-25 | 钟春燕 | Preparation method of bacterial cellulose composite flavonoid compound |
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| CN103989190B (en) * | 2014-06-06 | 2016-03-23 | 海南椰国食品有限公司 | A kind of preparation method of low temperature meat emulsion product |
| CN104629279A (en) * | 2015-02-03 | 2015-05-20 | 安徽民祯生物工程有限公司 | Bacteriocin bacteriostatic fresh-keeping biological composite film |
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| CN106633156A (en) * | 2016-10-13 | 2017-05-10 | 东北农业大学 | Preparation method of bacterial cellulose-tea polyphenol composite antibacterial membrane |
| CN106633127A (en) * | 2016-10-18 | 2017-05-10 | 东北农业大学 | Application of bacterial cellulose-tea polyphenol composite film in food fresh keeping |
| CN106633127B (en) * | 2016-10-18 | 2019-08-23 | 东北农业大学 | A kind of bacteria cellulose-application of the tea polyphenols composite membrane in food fresh keeping |
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