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Preparation method of curdlan oxide

An oxidation reaction and resulting technology, applied in the field of biomass materials, can solve problems such as unobtainable and affecting the health of operators, and achieve the effects of green and pollution-free prices, excellent antibacterial effects, and high reaction efficiency

Active Publication Date: 2020-03-10
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

None of these methods can obtain the oxidized curdlan that is fully carboxylated at the 6-position
At present, sodium hypochlorite is used as an oxidant to obtain oxidized curdlan gum fully carboxylated at the 6-position. However, the chlorine-containing substances released during the oxidation of curdlan gum by sodium hypochlorite will affect the health of operators.

Method used

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  • Preparation method of curdlan oxide
  • Preparation method of curdlan oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Dissolve 1 g of curdlan in 50 mL of 2mol / L NaOH solution, and stir at room temperature for 2 hours to obtain curdlan aqueous solution A;

[0032] (2) Heat solution A to 60°C, add 2ml of hydrogen peroxide, stir and react for 1 hour, then add 2ml of hydrogen peroxide to react for 1 hour;

[0033] (3) the pH of the solution obtained in (2) is adjusted to 7 with hydrochloric acid of 2mol / L;

[0034] (4) After the solution obtained in step (3) was cooled to room temperature, the supernatant was filtered by a centrifuge, and the supernatant was freeze-dried to obtain 0.98 g of oxidized curdlan gum powder product. (Yield rate: 90%)

[0035] From figure 1 It can be seen that in the figure at 3360cm -1 There is a broad absorption peak nearby corresponding to the stretching vibration of the large amount of -OH in the curdlan main chain. at 2875-2921cm -1 The absorption peak corresponds to -CH 2 The CH symmetric stretching vibration group. The oxidized curdlan gum that ...

Embodiment 2

[0037] (1) Take 1 g of curdlan gum and dissolve it in 50 mL of 2mol / L NaOH solution, stir at room temperature for 3 hours to obtain curdlan gum aqueous solution A;

[0038] (2) Heat solution A to 50°C, add 2ml of hydrogen peroxide, stir and react for 1 hour, then add 1ml of hydrogen peroxide, react for one hour, add 1ml of hydrogen peroxide to react for half an hour;

[0039] (3) the pH of the solution obtained in (2) is adjusted to 7 with hydrochloric acid of 2mol / L;

[0040] (4) After cooling the solution obtained in step (3) to room temperature, filter the supernatant with a centrifuge, and freeze-dry the supernatant to obtain the oxidized curdlan gum powder product.

[0041] The oxidized curdlan powder product is a C6-position completely carboxylated oxidized curdlan product, and the yield is: 91%.

Embodiment 3

[0043] (1) Dissolve 1 g of curdlan in 50 mL of 2mol / L NaOH solution, and stir at room temperature for 2 hours to obtain curdlan aqueous solution A;

[0044] (2) Heat solution A to 60°C, add 5ml of hydrogen peroxide, stir and react for 1 hour, then add 5ml of hydrogen peroxide, and continue the reaction for one hour;

[0045] (3) the pH of the solution obtained in (2) is adjusted to 7 with hydrochloric acid of 2mol / L;

[0046] (4) After cooling the solution obtained in step (3) to room temperature, filter the supernatant with a centrifuge, and freeze-dry the supernatant to obtain the oxidized curdlan gum powder product.

[0047] The oxidized curdlan powder product is a C6-position completely carboxylated oxidized curdlan product with a yield of 89%.

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Abstract

The invention discloses a preparation method of curdlan oxide and belongs to the field of biomass materials. H2O2 is added in batches and oxidization time is strictly controlled, so that the -CH2OH groups in the molecular structure in the curdlan oxide are all converted into -COONa or -COOH without generation of other side products. The preparation method is high in reaction efficiency, gentle inreaction conditions and simple in operation, and employs cheap, green and zero-pollution reagents.

Description

technical field [0001] The invention belongs to the field of biomass materials, and in particular relates to a preparation method of oxidized curdlan gum. Background technique [0002] Curdlan gum, also known as thermal gel, coagulated polysaccharide, is a water-insoluble glucan composed of β-1,3-glucosidic bonds produced by microbial fermentation, with a relative molecular weight of about 500,000 to 2,000,000. Curdlan gum is a natural biological molecule, non-toxic and has no side effects, and has a wide range of sources. Compared with many natural polysaccharides, it has many potential advantages for development: 1) Curdlan gum has very good biodegradability, biocompatibility and biological non-toxicity; 2) It can be dissolved in alkaline water, which is convenient for its homogeneity 3) Its molecular structure contains multiple active -OH, which is an ideal site for structural modification. [0003] Oxidized polysaccharides have received a lot of attention in recent yea...

Claims

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Application Information

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IPC IPC(8): C08B37/00
CPCC08B37/0024
Inventor 陈美玲季天晨
Owner JIANGNAN UNIV
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