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Gelatin and preparation method thereof

A technology of gelatin and gelatin solution, applied in the preparation of animal glue or gelatin, food preparation, food science, etc., to achieve low ash content and prevent dehydration condensation

Inactive Publication Date: 2013-12-04
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is currently no suitable method for preparing gelatin from the skin of cold-water fish

Method used

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  • Gelatin and preparation method thereof
  • Gelatin and preparation method thereof

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preparation example Construction

[0042] The invention provides a preparation method of gelatin, which comprises the following steps of acid-base treatment, hot water extraction, purification and drying. Optionally, a chopping step is also included before the acid-base treatment step. Optionally, a washing step is also included prior to the chopping step. Preferably, the preparation method of the present invention sequentially includes a cleaning step, a chopping step, an acid-base treatment step, a hot water extraction step, a purification step, and a drying step.

[0043] In the cleaning step of the present invention, the skin of the cold-water fish is cleaned, and the fat and fish meat on the surface are removed. Preferably, wash with cold water. The temperature of cold water is preferably 0 to 10°C, more preferably 5 to 8°C. In the cleaning step of the present invention, it is preferred to: use cold water to clean the fish skin; use petroleum ether to carry out reflux degreasing to the fish skin, the re...

Embodiment 1

[0090] Such as figure 1 As shown, taking salmon skin as an example to prepare cold-water fish gelatin as a raw material, the following process steps are performed in sequence:

[0091] Step 1: Thaw the salmon skin and wash it with cold water to remove the sticky fat and fish meat on the surface;

[0092] Step 2: Mince the cleaned salmon skin into 2 pieces of fish skin;

[0093] Step 3: Clean the fish skin fragments, and use 10mL Ca(OH) per 1g fish skin 2 Proportion of solution: Add calcium hydroxide solution with a concentration of 0.12wt% to the fish skin, soak at 10°C for 8 hours, rinse the fish skin after alkali treatment with cold water, and add 10 mL of HCl solution per 1 g of fish skin to the fish skin Add a hydrochloric acid solution with a concentration of 0.1wt%, soak for 1h;

[0094] Step 4: Wash the fish skin after the acid-base treatment until neutral, add water to the fish skin at a ratio of 3 mL of deionized water per 1 g of fish skin, and extract at 50°C for ...

Embodiment 2

[0099] Taking cod skin as an example to prepare fish gelatin as a raw material, the following process steps are carried out in sequence:

[0100] Step 1: Thaw the cod skin and wash it with cold water to remove the sticky fat and fish meat on the surface;

[0101] Step 2: Mince the cleaned cod skin into 2 pieces of fish skin;

[0102] Step 3: Clean the fish skin fragments, add 0.2wt% sodium hydroxide solution to the fish skin at a ratio of 10 mL NaOH solution per 1 g fish skin, soak at 10°C for 6 hours, and rinse the fish skin after alkali treatment with cold water Clean, add a hydrochloric acid solution with a concentration of 0.12wt% to the fish skin at a ratio of 10 mL of hydrochloric acid solution per 1 g of fish skin, and soak for 0.5 h;

[0103] Step 4: Wash the fish skin after the acid-base treatment to neutrality, add water to the fish skin at a ratio of 3 mL of deionized water per 1 g of fish skin, and extract at 45° C. for 3 hours;

[0104] Step 5: the filtered gela...

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Abstract

The invention discloses gelatin and a preparation method thereof. The preparation method comprises steps of steeping fish skin of cold water fish in an alkaline solution; cleaning the fish skin steeped in the alkaline solution and steeping in an acid solution; adjusting the fish skin after the acid treatment step and the alkaline treatment step to be neutral, and extracting in hot water having a temperature of 40-100 DEG C to obtain the first gelatin solution; after the first gelatin solution is filtered, exchanging through a cation exchange resin and then exchanging through an anion exchange resin to obtain the second gelatin solution; and drying the second gelatin solution directly, or concentrating the second gelatin solution and then drying. The preparation method is simple in operation, easy in control, and low in cost. The waste fish skin is fully utilized and the waste is changed into things of value, thus reducing environment pollution. The gelatin is different from warm-water fish gelatin and terrestrial-animal gelatin, and is capable of preventing dehydration synthesis and playing a systematization function, and is suitable for preparing chilled food.

Description

technical field [0001] The invention relates to gelatin and a preparation method thereof, especially cold-water fish gelatin and a preparation method thereof. Background technique [0002] Gelatin is a very important biomaterial widely used in pharmaceuticals, cosmetics, food, photography and other fields. The current gelatin is mainly gelatin derived from animals such as pigs and cattle. However, these gelatins may have problems with immunogenicity, religious beliefs, etc. In the future, gelatin extracted from fish skin, fish bones, and fish fins may replace gelatin from pigs and cattle. Currently, fish gelatin has become an international research hotspot. Fish gelatin (e.g. gelatin from river fish, ocean fish) is made from sources that are not affected by BSE and are therefore safer and healthier. In religion, Hindus and Muslims have no taboo on fish gelatin. Therefore, for Jews and Indians, fish gelatin is more popular. [0003] Fish skin is rich in collagen. Nagai ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09H3/00A23L1/0562A23L29/281
Inventor 黄雅钦刘小敏李承明
Owner BEIJING UNIV OF CHEM TECH
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