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Preparation method of carboxymethyl chitin

A technology of carboxymethyl chitin and chitin, applied in the field of material science, can solve the problems of large environmental pollution and serious molecular weight degradation of products, and achieve the effects of environmental friendliness, high degree of substitution and high yield

Inactive Publication Date: 2013-09-11
HUASHAN AQUATIC FOOD & PROD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, the synthesis of carboxymethyl chitin adopts a heterogeneous synthesis method, using a high concentration of alkali (40%-60%) for alkalization, the reaction temperature is above 60 ° C, and using an organic solvent as the dispersed phase, through the combination with chloroacetic acid It is prepared by reaction, and the molecular weight of the prepared product is seriously degraded, causing great environmental pollution

Method used

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  • Preparation method of carboxymethyl chitin
  • Preparation method of carboxymethyl chitin
  • Preparation method of carboxymethyl chitin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 0.25g chitin to 49.75g NaOH and CO(NH 2 ) 2 In the mixed solution, the mass percentage of NaOH is 6%, CO(NH 2 ) 2 The mass percentage of chitin is 2%, and it is frozen at -18°C for 24 hours, thawed at room temperature, and fully stirred to prepare a chitin solution with a mass percentage concentration of 0.5%. According to the molar ratio of chitin monomer and sodium chloroacetate as 1:4, add 0.574g sodium chloroacetate to the chitin solution, and stir at 0°C for 72 hours, adjust the pH value of the chitin solution to Neutral, dialyze the neutral chitin solution in distilled water for 7 days until the sodium chloride is completely removed, and dry the dialyzed liquid by freeze-drying to obtain spongy carboxymethyl chitin.

Embodiment 2

[0028] Add 1g of chitin to 49g of NaOH and CO(NH 2 ) 2 In the mixed solution, the mass percentage of NaOH is 8%, CO(NH 2 ) 2 The mass percentage of chitin is 4%, and it is frozen at -22°C for 18 hours, thawed at room temperature, and fully stirred to prepare a chitin solution with a mass percentage concentration of 2%. According to the molar ratio of chitin monomer to sodium chloroacetate as 1:7, add 4.017g sodium chloroacetate to the chitin solution, and stir at 15°C for 72 hours, adjust the pH value of the chitin solution to Neutral, dialyze the neutral chitin solution in distilled water for 7 days until the sodium chloride is completely removed, and dry the dialyzed liquid by freeze-drying to obtain spongy carboxymethyl chitin. figure 1 In (b) curve and figure 2 They are the infrared spectrogram and nuclear magnetic resonance spectrogram of carboxymethyl chitin obtained in this example respectively.

[0029] from figure 1 It can be seen from the curve (a) that the ch...

Embodiment 3

[0032] Add 1g of chitin to 49g of NaOH and CO(NH 2 ) 2 In the mixed solution, the mass percentage of NaOH is 8%, CO(NH 2 ) 2 The mass percentage of chitin is 4%, and it is frozen at -22°C for 18 hours, thawed at room temperature, and fully stirred to prepare a chitin solution with a mass percentage concentration of 2%. According to the molar ratio of chitin monomer and sodium chloroacetate as 1:10, add 5.739g sodium chloroacetate to the chitin solution, and stir at 15°C for 72 hours, adjust the pH value of the chitin solution to Neutral, dialyze the neutral chitin solution in distilled water for 7 days until the sodium chloride is completely removed, and dry the dialyzed liquid by freeze-drying to obtain spongy carboxymethyl chitin.

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Abstract

The invention discloses a preparation method of carboxymethyl chitin. The preparation method comprises the following steps of: (1) dissolving chitin into mixed solution of NaOH and CO(NH2)2 to obtain solution of chitin; (2) adding sodium chloroacetate into the chitin solution, stirring at the temperature of 0-20 DEG C for 72-120h, and adjusting the pH value of the solution of chitin to be neutral by using diluted hydrochloric acid, wherein the molar ratio of a chitin monomer to the sodium chloroacetate is 1:(4-20); and (3) dialyzing the neutral chitin solution until sodium chloride in the neutral chitin solution is completely removed, and drying and dialyzing to obtain a liquid, i.e., the spongy carboxymethyl chitin. The method disclosed by the invention is mild in reaction, little in damage to chitin molecules and high in product substitution degree and can be applied to fields such as cosmetics, food packaging films, spinning, agriculture, medicines and environment protection; the obtained carboxymethyl chitin has ion sensibility.

Description

technical field [0001] The invention belongs to the field of material science, and in particular relates to a preparation method of carboxymethyl chitin. Background technique [0002] Chitin, also known as chitin, chitin, chitin, polyacetylglucosamine, is widely found in the shells of crustaceans, shrimps, crabs, insects, fungal cell walls and plant cell walls. One of the most abundant organic matter. However, there are strong hydrogen bonds in and between chitin molecules, making it insoluble in general solvents, and only soluble in concentrated acids, concentrated alkalis and some organic solvents, which greatly limits the wide application of chitin as a renewable resource. , the utilization of this natural resource has been mostly limited to the research and development of its deacetylation product - chitosan, while the direct utilization of chitin is relatively small. [0003] Carboxymethyl chitin is a water-soluble anionic polymer with carboxyl groups in its molecular...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08
Inventor 施晓文丁福源邓红兵姚华杜予民漆雕良仁
Owner HUASHAN AQUATIC FOOD & PROD CO LTD
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