Method for pretreating gelatin by liming

Abstract

The invention provides a method for pretreating gelatin by liming. The grease content of a gelatin finished product can be reduced by treating pickled and rinsed ossein with dilute ammonia water. The ammonia water is used to replace sodium hydroxide, a saponified matter formed after a reaction and emulsified particles formed by the saponified matter and fat have high solubility and can be separated from the ossein easily, and the residual fat content of the ossein is low. The method can reduce the grease content of the gelatin finished product, improve the liming efficiency of the gelatin andshorten the liming circle of the gelatin.

Description

technical field

[0001] The invention relates to gelatin preparation technology, in particular to a liming pretreatment method for preparing gelatin by alkaline method. Background technique

[0002] Gelatin (gelatin) is a water-soluble protein mixture, generally produced by partial acid or alkali hydrolysis of collagen in animal bones, ligaments, tendons, etc., or boiling in water, colorless or slightly yellowish transparent crisp or coarse powder , It swells in water at 35-40°C to form a gel (water content is 5-10 times its own weight). Widely used in food and making adhesives, photosensitive negatives, filters, etc.

[0003] At present, gelatin is generally prepared by alkaline method, which generally includes steps such as pickling, washing, liming, and gel extraction.

[0004] The minerals in the aggregate are mainly water-insoluble, and acid-soluble calcium, magnesium phosphates and carbonates, accounting for 60-65% of the total, of which calcium phosphate Ca 3 (PO 4...

Examples

Embodiment 1

[0022] Embodiment 1 gelatin liming pretreatment

[0023] 1. Pickling and washing

[0024] Pickling and washing can be carried out according to existing conventional methods. Specifically, the aggregate is processed into bone grains with a particle size of 10-15 mm, soaked in hydrochloric acid with a concentration of 4%, and the amount of hydrochloric acid passing through per ton of bone grains per hour is 400L. When the concentration of soaked hydrochloric acid remains unchanged (96h), it reaches a plateau and maintains a plateau for 24 hours. It is detected that the minerals are basically depleted, and the aggregate is soft and elastic. Wash with water until pH > 3.5.

[0025] 2. Liming pretreatment

[0026] Add 3% dilute ammonia solution to the acid-soaked bone bone (washed to pH 3.6) that has passed the water washing, and agitate with compressed air to make the bone bone and the solution evenly mixed, and react for 24 hours. Agitate with compressed air every 2 hours. A...

Embodiment 2

[0027] Embodiment 2 gelatin liming pretreatment

[0028] Add 4% dilute ammonia solution to the washed osteoin pH 3.8, agitate with compressed air to mix the osteoin and the solution evenly, and react for 36 hours. Agitate with compressed air every 3 hours. After the reaction is over, remove the residual liquid and wash with water 3 times. The reacted bone is called G1. Mix 4% dilute ammonia solution and 0.8% hydrogen peroxide solution at a ratio of 1:1 to form a mixture and add it to G1 to react for 36 hours, agitating with compressed air every 3 hours. After the reaction is over, remove the residual liquid and wash with water 3 times. The reacted bone is called G2. According to this procedure, the osteotin and the mixed solution were reacted 3 times, and the liming pretreatment was completed after washing with water.

Embodiment 3

[0029] Embodiment 3 gelatin liming pretreatment

[0030] Add 5% dilute ammonia solution to the washed osteoin pH 4.0, agitate with compressed air to mix the osteoin and the solution evenly, and react for 48 hours. Agitate with compressed air every 4 hours. After the reaction is over, remove the residual liquid and wash with water 4 times. The reacted bone is called G1. Mix 5% dilute ammonia solution and 1% hydrogen peroxide solution at a ratio of 1:1 to form a mixture and add it to G1 to react for 48 hours, agitating with compressed air every 4 hours. After the reaction is over, remove the residual liquid and wash with water 4 times. The reacted bone is called G2. According to this procedure, the osteotin and the mixed solution were reacted 4 times, and the liming pretreatment was completed after washing with water.

technical field

[0001] The invention relates to gelatin preparation technology, in particular to a liming pretreatment method for preparing gelatin by alkaline method. Background technique

[0002] Gelatin (gelatin) is a water-soluble protein mixture, generally produced by partial acid or alkali hydrolysis of collagen in animal bones, ligaments, tendons, etc., or boiling in water, colorless or slightly yellowish transparent crisp or coarse powder , It swells in water at 35-40°C to form a gel (water content is 5-10 times its own weight). Widely used in food and making adhesives, photosensitive negatives, filters, etc.

[0003] At present, gelatin is generally prepared by alkaline method, which generally includes steps such as pickling, washing, liming, and gel extraction.

[0004] The minerals in the aggregate are mainly water-insoluble, and acid-soluble calcium, magnesium phosphates and carbonates, accounting for 60-65% of the total, of which calcium phosphate Ca 3 (PO 4...

Examples

Embodiment 1

[0022] Embodiment 1 gelatin liming pretreatment

[0023] 1. Pickling and washing

[0024] Pickling and washing can be carried out according to existing conventional methods. Specifically, the aggregate is processed into bone grains with a particle size of 10-15 mm, soaked in hydrochloric acid with a concentration of 4%, and the amount of hydrochloric acid passing through per ton of bone grains per hour is 400L. When the concentration of soaked hydrochloric acid remains unchanged (96h), it reaches a plateau and maintains a plateau for 24 hours. It is detected that the minerals are basically depleted, and the aggregate is soft and elastic. Wash with water until pH > 3.5.

[0025] 2. Liming pretreatment

[0026] Add 3% dilute ammonia solution to the acid-soaked bone bone (washed to pH 3.6) that has passed the water washing, and agitate with compressed air to make the bone bone and the solution evenly mixed, and react for 24 hours. Agitate with compressed air every 2 hours. A...

Embodiment 2

[0027] Embodiment 2 gelatin liming pretreatment

[0028] Add 4% dilute ammonia solution to the washed osteoin pH 3.8, agitate with compressed air to mix the osteoin and the solution evenly, and react for 36 hours. Agitate with compressed air every 3 hours. After the reaction is over, remove the residual liquid and wash with water 3 times. The reacted bone is called G1. Mix 4% dilute ammonia solution and 0.8% hydrogen peroxide solution at a ratio of 1:1 to form a mixture and add it to G1 to react for 36 hours, agitating with compressed air every 3 hours. After the reaction is over, remove the residual liquid and wash with water 3 times. The reacted bone is called G2. According to this procedure, the osteotin and the mixed solution were reacted 3 times, and the liming pretreatment was completed after washing with water.

Embodiment 3

[0029] Embodiment 3 gelatin liming pretreatment

[0030] Add 5% dilute ammonia solution to the washed osteoin pH 4.0, agitate with compressed air to mix the osteoin and the solution evenly, and react for 48 hours. Agitate with compressed air every 4 hours. After the reaction is over, remove the residual liquid and wash with water 4 times. The reacted bone is called G1. Mix 5% dilute ammonia solution and 1% hydrogen peroxide solution at a ratio of 1:1 to form a mixture and add it to G1 to react for 48 hours, agitating with compressed air every 4 hours. After the reaction is over, remove the residual liquid and wash with water 4 times. The reacted bone is called G2. According to this procedure, the osteotin and the mixed solution were reacted 4 times, and the liming pretreatment was completed after washing with water.

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