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New preparation method of housefly larva chitosan

A technology of fly maggot chitosan and a new method, applied in the field of biochemistry, can solve the problems of low separation efficiency and achieve the effect of low energy consumption and short time

Active Publication Date: 2012-01-18
SHENZHEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent 201019146025.1 discloses a preparation method of fly maggot chitosan, which mainly adopts chemical methods to separate chitosan from fly maggot peeling, and the disadvantage is that the separation efficiency is low

Method used

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  • New preparation method of housefly larva chitosan
  • New preparation method of housefly larva chitosan
  • New preparation method of housefly larva chitosan

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 Fly maggot chitosan prepares new method

[0025] Include the following steps:

[0026] 1) The pretreatment of halogenated fly maggots is to remove large debris such as sawdust, flies, and mud, leaving clean fly maggot shells, which are placed in an oven and dried to constant weight.

[0027] 2) Take a certain amount of fly maggot shells, stir and soak with 3% hydrochloric acid for 10 hours, wash with water, then replace with 3% hydrochloric acid solution, repeat stirring and soaking once, and wash with water. .

[0028] 3) Stir and soak the fly maggot shells with 5% sodium hydroxide solution for 15 hours to remove internal organs and other wastes.

[0029] 4) The fly maggot shells are soaked in a 2% potassium permanganate solution, placed in a dark place, stirred and reacted for 4 hours, washed with water, stirred and soaked with a 2% oxalic acid solution for 1 hour, washed with water, and then Be that the oxalic acid solution of 2% is soaked 3 hours aga...

experiment example

[0061] Experimental example Effect of microwave heating method and ordinary heating method on chitin deacetylation of fly maggots

[0062] Weigh 2 parts of 1.50g crude fly maggot chitin and put them into beakers respectively, add 100ml of 50% sodium hydroxide solution, put it on the electric furnace and heat it directly, adjust the power to 1800w, and keep stirring to prevent uneven heating And make concentrated lye splash. After washing, dry and measure the degree of deacetylation and viscosity. The following data are obtained, as shown in Table 6:

[0063] The degree of deacetylation, viscosity, recovery rate of table 6 electric furnace direct heating preparation fly maggot chitosan

[0064]

[0065] Comparing Table 6 and Table 4, it can be seen that the degree of deacetylation of chitosan prepared by common heating method is much lower than that of microwave heating method with much smaller heating time and heating power. Microwave method is heated at 380w The degree ...

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Abstract

The invention provides a new preparation method of housefly larva chitosan, which comprises the following steps: 1) performing brine housefly larvae pretreatment to remove impurities; 2) stirring and soaking housefly larva shells with a hydrochloric acid solution, washing; 3) soaking the housefly larva shells washed in step 2) with a sodium hydroxide solution to remove wastes; 4) decoloring the housefly larva shells obtained in step 3) to obtain crude housefly larva chitin; 5) performing deacetylation of the crude housefly larva chitin by a microwave heating method to obtain chitosan. Chitosan is extracted from housefly larva shells by the method of the invention, and the method has the following advantages: 1) the deacetylation degree of the chitosan is increased to 94.4%; when compared with related national standards, the chitosan has a high deacetylation degree, and the product quality is improved by one grade; 2) the recovery rate of the chitosan is increased; 3) the deacetylationprocess is short in time, and low in energy consumption.

Description

technical field [0001] The invention relates to the field of biochemistry, in particular to a new method for preparing fly maggot chitosan. Background technique [0002] Chitosan (chitosan) is obtained by deacetylation of chitin (chitin), which exists widely in nature, and its chemical name is polyglucosamine (1-4)-2-amino-B-D glucose. It has a wide range of pharmacological effects. Including: 1) It has antibacterial activity and can inhibit the growth of some bacteria, fungi and viruses. 2) It can be coated with a film to keep fresh, and its film layer has permeability and water resistance as a preservative. 3) It has the effect of inhibiting oxidation and can be used as an antioxidant. 4) It has a chelating adsorption effect on many substances, and can be used to treat heavy metal wastewater, purify tap water, and separate metal ions in hydrometallurgy. 5) Combine with bile acid to block fat absorption to achieve weight loss and lipid regulation. 6) It has the function...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08
Inventor 续旭黎海雄姚秦泰王荣辉王川源
Owner SHENZHEN UNIV
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