US2132579A - Method for producing unhaired hides with the aid of mold tryptases - Google Patents
Method for producing unhaired hides with the aid of mold tryptases Download PDFInfo
- Publication number
- US2132579A US2132579A US70890A US7089036A US2132579A US 2132579 A US2132579 A US 2132579A US 70890 A US70890 A US 70890A US 7089036 A US7089036 A US 7089036A US 2132579 A US2132579 A US 2132579A
- Authority
- US
- United States
- Prior art keywords
- hides
- mold
- tryptases
- skins
- tryptase
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 102000001400 Tryptase Human genes 0.000 title description 18
- 108060005989 Tryptase Proteins 0.000 title description 18
- 238000004519 manufacturing process Methods 0.000 title description 3
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 11
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 11
- 239000004289 sodium hydrogen sulphite Substances 0.000 description 11
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 239000002253 acid Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 230000007935 neutral effect Effects 0.000 description 9
- 239000003153 chemical reaction reagent Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 229910001868 water Inorganic materials 0.000 description 6
- 210000004209 hair Anatomy 0.000 description 5
- 241000228212 Aspergillus Species 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 3
- 150000003863 ammonium salts Chemical class 0.000 description 3
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 3
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 3
- 239000001166 ammonium sulphate Substances 0.000 description 3
- 235000011130 ammonium sulphate Nutrition 0.000 description 3
- 235000011121 sodium hydroxide Nutrition 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 102000004190 Enzymes Human genes 0.000 description 2
- 108090000790 Enzymes 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
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 244000309466 calf Species 0.000 description 2
- 241000228197 Aspergillus flavus Species 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000019687 Lamb Nutrition 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- NKWPZUCBCARRDP-UHFFFAOYSA-L calcium bicarbonate Chemical compound [Ca+2].OC([O-])=O.OC([O-])=O NKWPZUCBCARRDP-UHFFFAOYSA-L 0.000 description 1
- 229910000020 calcium bicarbonate Inorganic materials 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000001175 calcium sulphate Substances 0.000 description 1
- 235000011132 calcium sulphate Nutrition 0.000 description 1
- 230000002951 depilatory effect Effects 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000002639 sodium chloride Nutrition 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000008234 soft water Substances 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C1/00—Chemical treatment prior to tanning
- C14C1/06—Facilitating unhairing, e.g. by painting, by liming
- C14C1/065—Enzymatic unhairing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S435/00—Chemistry: molecular biology and microbiology
- Y10S435/8215—Microorganisms
- Y10S435/911—Microorganisms using fungi
- Y10S435/913—Aspergillus
- Y10S435/915—Aspergillus flavus
Definitions
- the invention relates to preparing hides or skins for tanning, and more particularly to subjecting such hides or skins for depilating and/or bating purposes to neutral or weakly acid solutions containing mold tryptase, particularly those produced by the Aspergillus varieties, in the presence of sodium bisulphite.
- pancreatic enzymes particularly the tryptases
- ammonium salts are generally used along with the enzymes; due to the action of the lime content of the hides, these produce ammonia.
- the hides are placed the dehairing bath with 500 liters water of C., 3 kgs. sodium bisulphite,
- the hides After one day the hides are obtained in a depilated condition, free from basic hairs.
- the hides 5 :nay then be worked up without subsequent bat- 2.
- 100 kgs. calf hides, softened as usual, are treated with 500 liters water, 1.8 kgs. caustic soda, and 1.2 kgs. sodium sulphate.
- the hides After two to three 10 days the hides are placed in the depilating bath with 500 liters water at 25 C., 2.3 kgs. sodium bisulphite, 1.5 kgs. ammonium sulphate and 1 kg. mold tryptase. After one day they are depilated free from basic hair.
- the hides may then be is worked up as usual without subsequent bating.
- bating may be carried on over night. The next morning the hides are worked up as usual, that is,de-fleshed, smoothed, washed and finished. 5
- a method of preparing hides or skins for tanning which comprises pre-treating the hides with an alkaline reagent and then subjectin the pre-treated hides or'skins for depilating and bating purposes to a neutral to weakly acid solution containing a mold tryptase together with sodium bisulphite.
- a method of preparing hides or skins for tanning which comprises pre-treating the hides with an alkaline reagent and then subjecting the pre-treated hides or skins for depilating and bating purposes to a neutral to weakly acid solution containing a mold tryptase together with sodium bisulphite and an ammonium salt.
- a method of preparing hides or skins for tanning which comprises pre-treating the hides with an alkaline reagent and then subjectin the pre-treated hides or skins for depilating and bating purposes to a neutral to weakly acid sclu- 5 tion containinga mold try tase together with sodium bisulphite' and amn onium sulphate.
- a method of preparin; hides or skins for tanning which comprises pie-treating the hides with an alkaline reagent and then subjecting the pre-treated hides or skins for depilating and bating purposes to a neutral to weakly acid solution containing a mold tryptase together with sodium bisulphite, the tryptase being derived from Aspergillus varieties.
- tanning which comprises pre-treating the hides with an alkaline reagent and then subjecting the pre-treated hides or skins for depilating and bating purposes to a neutral to weakly acid solution containing a mold tryptase together with sodium bisulphite, the tryptase being derived from Asper gillus flavus. v
- a process for preparing hides or skins for tanning which includes the steps of pre-treatin'g the hides with an alkaline reagent and then subjecting the pre-treated' hides Ior'depilating or hating to a solution containing a mold tryptase; the improvement which consists in carrying out the depilatin and hating treatment with the tryptase in a neutral to weakly acid solution in the presence of sodium bisulphite.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Description
Patented @ct. Ii, 1938 METHOD FOR PRODUCING HIDES WITH THE AID OF MOLD TRY]?- TASES Otto Riihm, Darmstadt, Germany No Drawing. Application'March 25, 1936, Serial No. 70,890. In Germany April 2, 1935 6 Claims. .(Cl. 195-6) The invention relates to preparing hides or skins for tanning, and more particularly to subjecting such hides or skins for depilating and/or bating purposes to neutral or weakly acid solutions containing mold tryptase, particularly those produced by the Aspergillus varieties, in the presence of sodium bisulphite.
It is known to bate and dehair skins and hides with the aid of pancreatic enzymes, particularly the tryptases.
In the bating process, ammonium salts are generally used along with the enzymes; due to the action of the lime content of the hides, these produce ammonia.
16 In the depilatory process, sodium bicarbonate is largely usedwhich, on reaction with the caustic soda content of the hide, is transformed into sodium carbonate.
Hence, in one case ammoniacal and in the other case soda-containing hides are obtained. This condition of the hides has the drawback that when these hides encounter calcium bicarbonate or calcium sulphate or water containing both, insoluble calcium carbonate is formed which settles out mainly on the grain of the hide and subsequently deleteriously affects the dyeing capacity of the leather. A further drawback resides in the fact that the so-called basic hairs are sometimes difficult to remove.
30 Various attempts have been made to .replace the pancreatic tryptase by mold tryptases and to operate in alkaline, acid, or even neutral solutions. But in using mold tryptases difficulty has always been experienced in removing the base 35 and basic hairs.
It has been found that all of the aforesaid drawbacks may be obviated when mold tryptases, particularly those produced by the Aspergillus varieties, of which Aspergz'llus flavus is an example, are used in neutral to weakly acid solutions together with sodium bisulphite. By this procedure clean hides completely free from basic hairs have been obtained to an extent not entirely achievable hitherto. This procedure also requires that the use of alkali be reduced to about half It has further been found that the action of the solution used in accordance with the invention may be further improved by the addition of ammonium salts, e. g. ammonium sulphate.
Examples 1. 100 kgs. of calf hides, softened as. usual, are
treated with 500 liters water, 1.8 kgs. caustic soda,
the hides are placed the dehairing bath with 500 liters water of C., 3 kgs. sodium bisulphite,
-5 kgs. common salt, and 1 kg. mold tryptase.
After one day the hides are obtained in a depilated condition, free from basic hairs. The hides 5 :nay then be worked up without subsequent bat- 2. 100 kgs. calf hides, softened as usual, are treated with 500 liters water, 1.8 kgs. caustic soda, and 1.2 kgs. sodium sulphate. After two to three 10 days the hides are placed in the depilating bath with 500 liters water at 25 C., 2.3 kgs. sodium bisulphite, 1.5 kgs. ammonium sulphate and 1 kg. mold tryptase. After one day they are depilated free from basic hair. The hides may then be is worked up as usual without subsequent bating.
3. Ordinary lamb hides treated with limearsenic are (after the wool is removed) washed for two hours with soft water and then each 100 kg. weight of hide is bated with 300 liters water 20 at 25-30 0., 2 kgs. sodium bisulphite. 1 kg. ammonium sulphate and .35 kg. mold tryptase. The
bating may be carried on over night. The next morning the hides are worked up as usual, that is,de-fleshed, smoothed, washed and finished. 5
I claim:
1. A method of preparing hides or skins for tanning, which comprises pre-treating the hides with an alkaline reagent and then subjectin the pre-treated hides or'skins for depilating and bating purposes to a neutral to weakly acid solution containing a mold tryptase together with sodium bisulphite.
2. A method of preparing hides or skins for tanning, which comprises pre-treating the hides with an alkaline reagent and then subjecting the pre-treated hides or skins for depilating and bating purposes to a neutral to weakly acid solution containing a mold tryptase together with sodium bisulphite and an ammonium salt. 40
3. A method of preparing hides or skins for tanning, which comprises pre-treating the hides with an alkaline reagent and then subjectin the pre-treated hides or skins for depilating and bating purposes to a neutral to weakly acid sclu- 5 tion containinga mold try tase together with sodium bisulphite' and amn onium sulphate.
4. A method of preparin; hides or skins for tanning, which comprises pie-treating the hides with an alkaline reagent and then subjecting the pre-treated hides or skins for depilating and bating purposes to a neutral to weakly acid solution containing a mold tryptase together with sodium bisulphite, the tryptase being derived from Aspergillus varieties. B6
5. A method of preparing hides or skins for,
tanning, which comprises pre-treating the hides with an alkaline reagent and then subjecting the pre-treated hides or skins for depilating and bating purposes to a neutral to weakly acid solution containing a mold tryptase together with sodium bisulphite, the tryptase being derived from Asper gillus flavus. v
6. In a process for preparing hides or skins for tanning which includes the steps of pre-treatin'g the hides with an alkaline reagent and then subjecting the pre-treated' hides Ior'depilating or hating to a solution containing a mold tryptase; the improvement which consists in carrying out the depilatin and hating treatment with the tryptase in a neutral to weakly acid solution in the presence of sodium bisulphite.
' o'rro Rom
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE472911X | 1935-04-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2132579A true US2132579A (en) | 1938-10-11 |
Family
ID=89428569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US70890A Expired - Lifetime US2132579A (en) | 1935-04-02 | 1936-03-25 | Method for producing unhaired hides with the aid of mold tryptases |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2132579A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2639967A (en) * | 1950-04-07 | 1953-05-26 | Benckiser Gmbh Joh A | Deliming hides with citric acid fermentation liquor |
| US3076749A (en) * | 1959-06-24 | 1963-02-05 | Roehm & Haas Gmbh | Method of unhairing skins and hides |
| US4636222A (en) * | 1984-08-07 | 1987-01-13 | Rohm Gmbh | Enzymatic unhairing method |
-
1936
- 1936-03-25 US US70890A patent/US2132579A/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2639967A (en) * | 1950-04-07 | 1953-05-26 | Benckiser Gmbh Joh A | Deliming hides with citric acid fermentation liquor |
| US3076749A (en) * | 1959-06-24 | 1963-02-05 | Roehm & Haas Gmbh | Method of unhairing skins and hides |
| US4636222A (en) * | 1984-08-07 | 1987-01-13 | Rohm Gmbh | Enzymatic unhairing method |
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