Preparation method of fly maggot chitosan

Abstract

The invention relates to a method of preparing chitosan by using fly maggots, which comprises the followings steps that: firstly, the skin of a maggot is separated from entrails by pressing the fly maggot, an alkali solution is used to remove protein, a dilute acid solution is used to de-ash, and the impurities of the head of the maggot are removed by a physical method to obtain chitin; secondly, the chitin is deacetylated by 40-55% (W) of caustic soda solution, and then is separated to obtain a filter cake chitosan; and the chitosan is repeatedly washed until the PH value is equal to 7; thirdly, the cleaned chitosan adopts two processing methods: one method is to obtain flaky chitosan by drying, and the other method is that the chitosan is dissolved in dilute acid and centrifugally separated by a tube type centrifuge to obtain filtrate a chitosan solution; alkali is added in the filtrate until the PH value is equal 7-7.5, the chitosan is precipited and is separated by the tube type centrifuge to obtain a filter cake chitosan, and powdery chitosan is obtained after drying. The invention has the characteristics that: water can be saved, the chitosan product has low heavy metal content, low toxic content and stable product quality, the productivity is high and the production cost is low.

Description

technical field [0001] The invention relates to a preparation method of fly maggot chitosan. Background technique [0002] Chitosan on the market is mostly extracted from shrimp and crab shells. Due to the large amount of lime and wax in shrimp shells and crab shells, the produced chitosan has many impurities. The content of chitosan in shrimp shells and crab shells is only (10-30%). And the skin of fly maggot is delicate, soft, white, chitosan content is (30~50%), heavy metal ion content, ash content are extremely low, is the top-grade raw material of preparing chitosan. Use fly maggots to produce chitosan with high degree of deacetylation, low heavy metal content, and good color, to provide raw materials for high-added commodities such as medicines, health care products, cosmetics, and food, to extend and improve the chitin industry chain, and strive to produce more Economic benefits and better social and ecological benefits. [0003] The production technology of exist...

AI Technical Summary

Problems solved by technology

The maggot pulp in the water has a low concentration and a large amount, so it cannot be directly used

It is difficult to recover the maggot pulp, and the maggot pulp will stink and deteriorate after 1 hour

Great pollution to the environment

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