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Preparation method for preparing chitosan by utilizing snow crab shells

A technology of chitosan and crab shells, which is applied in the field of preparation of chitosan from fresh snow crab shells, can solve the problems of severe product molecular chain damage, failure to comprehensively utilize resources, low product viscosity, etc., and achieve stable product quality , breaking the limitation and instability of the drying process and the control of cleanliness, and the effect of high product viscosity

Active Publication Date: 2020-05-12
SHANDONG MEIJIA GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this preparation method, energy consumption is high, and strong acid and strong alkali are used, which seriously damages the molecular chain of the product, the viscosity of the product is low, the resources are not comprehensively utilized, and the environmental pollution is serious.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 200g of fresh snow crab shells, that is, the leftovers of fresh snow crabs just after aquatic processing in the previous process. After crushing, add 1000g of citric acid solution with a mass percentage concentration of 5%, soak for 15 hours, filter with gauze, and use tap water or Wash the crab shells with pure water to obtain a decalcified crab shell. The washing residue and the filtrate are combined to obtain a mixture. The mixture is filtered through a plate frame, and the filter residue is dried to obtain calcium citrate. The remaining mixture is collected for reuse after subsequent treatment. Add 1000g of 5% citric acid solution, repeat the above operation steps once to obtain decalcified crab shells; add 1000g of water to the decalcified crab shells, add 2g of flavor enzymes, keep warm at 49°C for 3 hours, inactivate the enzymes, filter, and obtain The filtrate was concentrated and spray-dried to obtain crab protein powder. The obtained crab shells were added...

Embodiment 2

[0026] Take 200g of fresh snow crab shells, that is, the leftovers of fresh snow crabs just after aquatic processing in the previous process. After crushing, add 600g of citric acid solution with a mass percentage concentration of 10%, soak for 6 hours, filter with gauze, and use tap water or Wash the crab shells with pure water to obtain a decalcified crab shell, combine the washing residue with the filtrate to obtain a mixture, filter the mixture through a plate frame, dry the filter residue to obtain calcium citrate, and collect the remaining mixture for reuse after subsequent processing; Add 400g of 10% citric acid solution, repeat the above steps until no bubbles are produced, indicating complete reaction, to obtain decalcified crab shells; add 400g of water to the decalcified crab shells, add 0.4g of flavor enzymes, and keep warm at 45°C After 5 hours, after inactivating the enzyme, filter, the obtained filtrate is concentrated and spray-dried to obtain crab protein powde...

Embodiment 3

[0028]Take 200g of fresh snow crab shells, that is, the leftovers of fresh snow crabs just after aquatic processing in the previous process. After crushing, add 700g of citric acid solution with a mass percentage concentration of 8%, soak for 10 hours, filter with gauze, and use tap water or Wash the crab shells with pure water to obtain a decalcified crab shell, combine the washing residue with the filtrate to obtain a mixture, filter the mixture through a plate frame, dry the filter residue to obtain calcium citrate, and collect the remaining mixture for reuse after subsequent processing; Add 700g of 8% citric acid solution, repeat the above steps until no bubbles are generated, indicating that the complete reaction has occurred, and the decalcified crab shells are obtained; add 700g of water to the decalcified crab shells, add 1g of flavor enzyme, and keep warm at 55°C for 4 hour, after inactivating the enzyme, filter, the obtained filtrate is concentrated and spray-dried to...

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Abstract

A preparation method for preparing chitosan by utilizing snow crab shells relates to the technical field of preparation methods of high-viscosity chitosan, and particularly belongs to a preparation method for preparing chitosan by utilizing fresh snow crab shells. Crab shell pretreatment: taking 200 parts (by mass) of fresh snow crab shells, and crushing the fresh snow crab shells; decalcifying the crab shells: adding 600-1000 parts by mass of a citric acid solution with the mass percent concentration of 5-10% into the crab shells, soaking for 6-15 hours, filtering, washing the crab shells obtained by filtering by using water as a washing solution, and combining washing residual liquid with a filtrate to obtain a mixture for storage; extracting organic calcium: filtering the mixture through a plate frame, and drying filter residues to obtain calcium citrate; and collecting the residual mixed solution for later use after subsequent treatment. Three wastes are avoided in the whole production process, and zero waste, zero emission and high-value utilization are realized. A high-temperature strong-alkali deproteinization procedure is not needed, so that energy conservation, environmental protection and stable product quality are realized. The product has high viscosity and good quality.

Description

technical field [0001] The invention relates to the technical field of preparation methods of high-viscosity polysaccharides, in particular to a method for preparing chitosan from fresh snow crab shells. Background technique [0002] Snow crab shells are wastes produced in the process of aquatic products processing. With the development of the aquatic products processing industry, the amount of these wastes is increasing. According to statistics, the annual output of snow crab shells in the world is about 600,000 tons. Making full use of these crab shells can form an industrial scale of more than 40 billion. At present, the utilization of snow crab shells is mainly processed into feed, only a small part is processed into chitin and chitosan, the processing technology is backward, the environmental pollution is serious, the quality of chitin and chitosan products is unstable, and some heavy metals in the products exceed the standard , the added value of the product is low, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08C12P21/06C07C59/265C07C51/41C07C51/42C07C51/47
CPCC08B37/003C08B37/0003C12P21/06C07C51/412C07C51/42C07C51/47C07C59/265
Inventor 郭晓华张永勤张廷翠董浩郑萌萌
Owner SHANDONG MEIJIA GROUP
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