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Production method of chitin by using shrimp shell

A technology of chitin and shrimp shells, which is applied in the field of chitin preparation, can solve the problems of large amount of acid and alkali waste liquid waste water, serious environmental pollution, and many operation steps, and achieve less waste water waste liquid, simple process steps, and simple process Effect

Inactive Publication Date: 2015-11-25
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problems in the prior art of preparing chitin from shrimp shells that the amount of acid and alkali is large, waste liquid and waste water are easily generated, the environment is polluted seriously, there are many operation steps, and the production cycle is long, and a method with simple process steps is provided. , mild conditions, strong operability, less waste water and waste liquid, short production cycle, high extraction rate method for producing chitin from shrimp shells

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Pretreatment: extruding and dehydrating the shrimp shells, drying the obtained solid materials and crushing them to 20 mesh to obtain shrimp shell powder, which is ready for use.

[0021] (2) Deproteinization: add water to the shrimp shell powder, the ratio of material to liquid is controlled at 1:5 (m / V), after stirring evenly, the temperature is raised to 60°C at a rate of 5°C every 30 minutes, and the pH is adjusted after holding for 5 hours To 9, add alkaline protease, the amount of alkaline protease added is 5000U / g, ultrasonic hydrolysis at 60°C for 30min, ultrasonic frequency 80kHz, power 120W, then adjust the pH to 10, heat treatment at 80°C for 30min, filter, The filtrate was washed with water until neutral and then dried to obtain deproteinized shrimp shell powder.

[0022] (3) Decalcification: Add EDTA disodium solution with a mass percentage concentration of 11% to the deproteinized shrimp shell powder, control the solid-liquid ratio at 1:1.5 (m / V), adju...

Embodiment 2

[0025] (1) Pretreatment: Extrude and dehydrate the shrimp shells, dry the obtained solid materials and crush them to 4 mesh to obtain shrimp shell powder, which is ready for use.

[0026] (2) Deproteinization: add water to the shrimp shell powder, control the ratio of material to liquid at 1:4 (m / V), stir evenly and raise the temperature to 40°C at a rate of 7°C every 30 minutes, adjust the pH after holding for 3 hours To 8, add alkaline protease, the amount of alkaline protease added is 4000U / g, ultrasonically hydrolyze at 50°C for 20min, ultrasonic frequency is 60kHz, power is 100W, then adjust the pH to 11, heat treatment at 100°C for 10min, filter, The filtrate was washed with water until neutral and then dried to obtain deproteinized shrimp shell powder.

[0027] (3) Decalcification: Add EDTA disodium solution with a mass percentage concentration of 9% to the deproteinized shrimp shell powder, control the solid-liquid ratio at 1:1 (m / V), adjust the pH to 9, and keep stirr...

Embodiment 3

[0030] (1) Pretreatment: Extrude and dehydrate the shrimp shells, and crush the obtained solid materials to 10 meshes to obtain shrimp shell powder, which is ready for use.

[0031] (2) Deproteinization: add water to the shrimp shell powder, the ratio of material to liquid is controlled at 1:4.5 (m / V), after stirring evenly, the temperature is raised to 45°C at a rate of 6°C every 30 minutes, and the pH is adjusted after holding for 4 hours To 8.5, add alkaline protease, the amount of alkaline protease added is 4500U / g, ultrasonically hydrolyze at 55°C for 25min, ultrasonic frequency is 70kHz, power is 110W, then adjust the pH to 10.5, heat treatment at 90°C for 20min, filter, The filtrate was washed with water until neutral and then dried to obtain deproteinized shrimp shell powder.

[0032] (3) Decalcification: Add EDTA disodium solution with a mass percent concentration of 10% to the deproteinized shrimp shell powder, control the solid-liquid ratio at 1:1.2 (m / V), adjust th...

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Abstract

The present invention discloses a production method of chitin by using shrimp shell. The method comprises the following steps: (1) pre-crushing; (2) deproteinizing by using a self-dissolution method, an enzymatic method and a soda method; (3) carrying out chelation decalcification by an EDTA disodium solution; and (4) carrying out joint decolorization by using KMnO4 solution and oxalic acid. The present invention is directed to the drawbacks of prior art and conducts overall optimization improvement on chitin production method by using shrimp shell. Self-dissolution method, enzymatic method and EDTA disodium chelation calcium removal method are organically integrated. The method has the advantages of simple process steps, mild conditions, strong operability, less waste water, short production cycle and high extraction rate, and is a green processing technology worthy popularization.

Description

technical field [0001] The invention relates to the technical field of chitin preparation, in particular to a method for producing chitin from shrimp shells. Background technique [0002] Chitin, also known as chitin and chitin, has a chemical name of β-(1,4)-2-acetylamino-2-deoxy-D-glucan, and its molecular formula is (C 8 h 15 NO 6 )n. Chitin and its derivatives have been widely used in the fields of environmental protection, food, medicine, functional materials, agriculture, forestry, and textile industry due to their unique functions and characteristics, and have huge economic value and broad application prospects. [0003] Shrimp shells contain 20% to 30% of chitin, 20% to 30% of organic matter such as protein, 30% to 40% of inorganic matter such as calcium, and 4% to 5% of pigment in terms of mass fraction. Therefore, shrimp shells should be a valuable biological resource. Extracting chitin from shrimp shells is a high-value utilization of shrimp shells, which is c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08
Inventor 陈小娥方旭波黄湛圆陈美玉张朝阳王军夫
Owner ZHEJIANG OCEAN UNIV