摘要:
What is disclosed is a method for the recovery of hair from an animal hide and for a concurrent opening of the hide structure using a proteolytic enzyme, which method comprises first pre-treating the hide, free of preservative salt, in the acid pH region with a material cleaving disulfide bridges and then, without a previous softening, concurrently loosening hair and opening the hide structure by treating said hide with a protease, effective in the alkaline region, at a pH value of about 11 to about 13.
摘要:
What is disclosed is a method for soaking skins or hides which comprises soaking said skins or hides in an acid bath containing at least one compound selected from the group of compounds having one of the formulasR--SH and ##STR1## wherein R is alkyl having 2 to 3 carbon atoms, alkyl having 2 or 3 carbon atoms mono-substituted with a thiol or OH group, or R is --(CH.sub.2).sub.n --(CHR.sub.1)--COOH wherein R.sub.1 is hydrogen or alkyl having 1 to 6 carbon atoms or is an amino group and n is an integer from 0 to 6, or R is R.sub.2 CO wherein R.sub.2 is alkyl having 1 to 6 carbon atoms or phenyl, and wherein R' is hydrogen, alkyl having 1 to 6 carbon atoms, or amino.
摘要:
A method is disclosed for making a water-soluble hydrolyzate of a keratinaceous starting material which comprises first subjecting said starting material to acid treatment at a pH of 2 or below and at an elevated temperature above 80.degree. C. to effect mild hydrolysis thereof and then enzymatically degrading said acid-treated material in an aqueous bath in the presence of urea with an alkaline proteinase having an activity optimum in a range between pH 9 and pH 13, the initial pH of the enzymatic treatment being within the pH range optimum for the enzyme employed.
摘要:
A method and a device for converting and separating substances dissolved in a carrier fluid, more particularly proteides or proteins, by adding and mixing with an agent, e.g. enzymes, which brings about the chemical reaction or the build-up or breakdown of the molecules of the substances and causes them to precipitate. In addition these substances are mixed and come to an accelerated reaction with the agent in at least one circuit flow through a jet immersion reactor while a gas is supplied intensively thereto before froth flotation of the precipitated substances is carried out after adding means assisting flotation.
摘要:
A method for conditioning a collagen-containing raw material to render it adaptable to hot-water extraction of collagen and collagen degradation products therefrom, which comprises incubating said raw material in an aqueous bath containing a neutral or alkaline protease at a pH between 6.5 and 13 in the presence of a member selected from the group consisting of urea, guanidine, or an acid addition salt of quanidine.
摘要:
A method for preparing tannable pelts from animal skins or hides, said method effecting concurrent softening, dehairing, opening of the hide structure, and bating in a single procedural step, which method comprises treating said skins or hides, free of preserving salt, with an aqueous bath having a pH between about 9 and about 12 and having dissolved therein:A. an effective amount of at least one member selected from the group consisting of a fungus protease whose optimum efficacy towards casein is at a pH above 7.0, and which protease may be replaced in whole or in part by trypsin and/or papain and/or by a bacterial protease whose maximum efficacy lies at a pH from 6 to 9;B. an effective amount of a bacterial protease having an optimum efficacy against hemoglobin at a pH above 9; andC. an effective amount of a short-chained, primary or secondary aliphatic amine.
摘要:
What is disclosed is a method for the enzymatic bating of pelts with simultaneous removal of scud, which method comprises bating said pelts in the acid pH range in the presence of an amylase and a protease.
摘要:
A method of treating sulfide-limed pelts in improved acid treating baths for purposes of de-liming, bating, pickling, or pre-tanning is disclosed. The improved baths contain water-soluble salts of manganese, cobalt, nickel, titanium, or zirconium, which salts discourage hydrogen sulfide formation during the acid treatment.
摘要:
What is disclosed is a process for the unhairing and subsequent curing of hides and skins, which comprises washing flayed skins and hides to remove adhering dirt, then soaking said skins and hides and freeing them of hair and scud with a short term unhairing, reversing the swelling of said skins and hides and neutralizing them, and curing said skins and hides with salt, said skins and hides being mechanically fleshed either after washing or at some later time in the process as recited.
摘要:
What is disclosed is a method for liming animal skins and hides which comprises treating said skins and hides with an aqueous alkaline liming liquor comprising a protective colloid, for example a protein such as gelatin, glue, or casein, or a water-soluble alkali-stable polymethacrylate.