Method for extracting chitin from dried shrimp shells

A technology for chitin and shrimp shells, applied in the field of extraction of chitin and chitin polysaccharide, can solve the problems of low product purity, high transportation cost, high water and protein content, and achieve the effect of high purity

Inactive Publication Date: 2015-01-14
TAIZHOU INST OF SCI &TECH NUST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that fresh shrimp shells can be used as raw materials, which have high water and protein content, are easily rotten and deteriorated, and the transportation cost is high; in addition, the process has not been decolorized, and the product purity is not high

Method used

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  • Method for extracting chitin from dried shrimp shells

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Effect test

Embodiment 1

[0041]A method for extracting chitin from dried shrimp shells,

[0042] (1) Coarse crushing: the dried shrimp shells are roughly crushed, and the obtained shrimp shell fragments have a diameter of 1 to 10 mm;

[0043] (2) Deep cleaning: soak 100kg of coarsely broken shrimp shells in water, add 1000kg of tap water or elutriation wastewater to soak, heat to 50°C, add 0.5kg of papain, stir for 5min, and keep the temperature at 50°C for reaction. Oscillate with an ultrasonic vibrator every 30 min, 3 min each time. After reacting for 6 hours, the solid-liquid mixture was poured into a 40-mesh sieve for filtration, and the turbid liquid and solid were collected respectively. The solid is washed with tap water to obtain clean shrimp shell fragments.

[0044] (3) Decalcification: Add 4wt% hydrochloric acid dropwise to the shrimp shell fragments, stop adding acid when the pH of the system drops to 4-5, and the solid obtained after solid-liquid separation is decalcified shrimp shell p...

Embodiment 2

[0048] like figure 1 Shown, the preferred method of extracting chitin from dried shrimp shells, the steps are as follows:

[0049] (1) Coarse crushing: the dried shrimp shells are roughly crushed to obtain shrimp shell fragments with a diameter of 3-5 mm.

[0050] (2) Deep cleaning: Take 100kg of the above-mentioned shrimp shell fragments, add 1000kg of tap water or elutriation wastewater to soak, heat to 50°C, add 0.5kg of papain, stir for 5min, and keep the temperature at 50°C for reaction. Oscillate with an ultrasonic vibrator every 30 min, 3 min each time. After reacting for 6 hours, the solid-liquid mixture was poured into a 40-mesh sieve for filtration, and the turbid liquid and solid were collected respectively. The solid is washed with tap water to obtain clean shrimp shell fragments. After the above turbid liquid is left to settle, the supernatant is used to make liquid fertilizer, and the precipitate is used to make protein feed; flocculants can also be added to t...

Embodiment 3

[0058] The optimal method for extracting chitin from dried shrimp shells, the steps are as follows:

[0059] (1) Coarse crushing: coarsely crushing dried shrimp shells to obtain shrimp shell fragments with a diameter of 1-3 mm.

[0060] (2) Deep cleaning: Take 100kg of the above-mentioned shrimp shell fragments, add 900kg of tap water or elutriation wastewater to soak, heat to 40°C, add 1kg of neutral protease, stir for 5min, and keep the temperature at 40°C for reaction. Oscillate with an ultrasonic vibrator every 30 min, 3 min each time. After reacting for 8 hours, the solid-liquid mixture was poured into an 80-mesh sieve for filtration, and the turbid liquid and solid were collected respectively. The solid is washed with tap water to obtain clean shrimp shell fragments. After the above turbid liquid is left to settle, the supernatant is used to make liquid fertilizer, and the precipitate is used to make protein feed; flocculants can also be added to the turbid liquid, aft...

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Abstract

The invention provides a method for extracting chitin from dried shrimp shells and belongs to the technical field of comprehensive utilization of aquatic product processing wastes. In order to solve the problem of difficulty in treatment of a large amount of manganese-containing wastewater generated in decolorizing with potassium permanganate during the conventional chitin extraction process, small-molecule organic acid decolorization is applied in extraction of chitin. The method comprises the following steps: firstly roughly crushing the dried shrimp shells, carrying out enzymatic hydrolysis on crushed dried shrimp shells with a protease, deeply cleaning, adding hydrochloric acid for decalcification and then deproteinizing with a potassium hydroxide solution, finally decolorizing with small-molecule organic acid to obtain a solid and cleaning the solid to obtain decolorized chitin. When decolorization is carried out in the method, the molecular chain of chitin cannot be destroyed, the pollution is small and after the decolorization is carried out with the small-molecule organic acid and waste acid obtained by the solid-liquid separation is subjected to reduced pressure distillation and can be recycled for decolorization.

Description

technical field [0001] The invention relates to a method for extracting chitin polysaccharide, in particular to a method for extracting chitin from shrimp shells, and belongs to the technical field of comprehensive utilization of aquatic product processing waste. Background technique [0002] Chitin is a polysaccharide formed by N-acetyl-2-amino-2-deoxy-D-glucose connected by β-1,4-glycosidic bonds. It is an important class of natural polymer materials. It is used in food industry, functional materials, It is widely used in medicine, agriculture and textile industry. [0003] The traditional method of producing chitin generally uses the shells of crustaceans such as shrimp and crab shells as raw materials. First, soak the shrimp and crab shells for a long time (40h) with excessive high-concentration (10%) hydrochloric acid, and wash them with water until neutral after soaking. , this step is used to remove inorganic salts such as calcium carbonate in the shell; then add 10-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08
Inventor 陈冬年刘显明顾焰波
Owner TAIZHOU INST OF SCI &TECH NUST
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