Process for enzymatic preparation of gelatin

Abstract

The invention provides a process for enzymatic preparation of gelatin. The process comprises steps of crushing bone grains, conducting acid pickling, extracting gel, filtering the gel, concentrating the gel and sterilizing the gel, wherein the step of acid pickling is implemented by the following operations: mixing a bone grain raw material with water according to a weight ratio of 1 to (1-5), controlling a pH value at 1-2.5, conducting soaking for 6-10h, removing a liquid phase by virtue of centrifugal separation, and collecting solid materials settled on a rotary drum wall. The process provided by the invention, compared with a conventional gelatin process by virtue of an alkaline method, can shorten a production cycle, greatly improve efficiency and improve the quality stability of the gelatin.

Description

technical field [0001] The invention belongs to the field of gelatin preparation, in particular to an enzymatic preparation process of gelatin products for capsules. Background technique [0002] Gelatin is a protein obtained through degradation and extraction from connective tissues such as animal bones and skins. It is a product of collagen degradation and is mainly used in the production of capsules, candy and food. Before this invention, the international and domestic production of bone gelatin used the alkaline process of hundreds of years, but with the improvement of people's awareness of environmental protection, gelatin producers' desire to improve the traditional alkaline process is also increasing. In recent years, many people have explored the use of biological methods instead of alkaline methods to produce gelatin. The production of bone gelatin by biological enzymatic hydrolysis technology has become a hot spot. At present, the laboratory research on enzymatic ...

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Problems solved by technology

[0003] Before this invention, the production of gelatin by enzymatic degradation in the prior art was still in the stage of laboratory research, and no industrialized equipment and process parameters suitable for enzymatic gelatin extraction conditions were selected, so large-scale applications were still due to enzymatic degradation. Collagen reaction is difficult to control and subject to restraint, such as CN102329843A discloses a method for enzymatic preparation of gelatin, the method includes the following steps: making bone particles into bone powder, acidifying with phosphoric acid, adding acid protease for hydrolysis, and then decolorizing with hydrogen peroxide, Calcium hydroxide is used to adjust the pH value, and then flocculant is added. This method uses phosphoric acid for acidification. Due to the formation of more soluble calcium salts, the enzymolysis reaction is relatively mild, which is conducive to the control of the end point of the enzymolysis reaction, and can produce low index. Gelatin, but can not reach the requirement of gelatin for capsule; A kind of method disclosed as CN103937859A takes bone powder as raw material by enzymatic method to get gelatin, and this method comprises: the defatted bone granule with particle size≤500 μ m is decalcified with hydrochloric acid, After separation by a solid-liquid separator, add water to the obtained decalcified bone meal and stir to obtain a slurry, add inorganic acid to adjust the pH value of the slurry between 1.5 and 5, and then add protease for enzymatic hydrolysis. Add alkaline aqueous solution to the resulting slurry, adjust the pH of the slurry to inactivate the added protease, heat and extract to obtain a mixed slurry containing gelatin, and carry out solid-liquid separation through a solid-liquid separator to obtain a gelatin transparent solution. After filtration, desalination, ion exchange, concentration and drying, tens of grams of gelatin products that meet the requirements can be obtained. However, due to the huge difference between the conditions of large-scale industrial production and laboratory conditions, it is still not qualified when used in industrial production. gelatin products for capsules

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