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Carbonyl starch oxidized using Fenton-like system and preparation method thereof

A carbonyl starch and system technology, applied in the field of carbonyl starch and its preparation, can solve the problems of low oxidation efficiency, poor starch oxidation selectivity, high production cost, etc., and achieve high oxidation efficiency, high carbonyl content, and strong oxidation ability.

Inactive Publication Date: 2015-10-21
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mild reaction conditions avoid the degradation of starch, and overcome the problems of poor selectivity, low oxidation efficiency and high production cost of existing starch oxidation

Method used

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  • Carbonyl starch oxidized using Fenton-like system and preparation method thereof
  • Carbonyl starch oxidized using Fenton-like system and preparation method thereof
  • Carbonyl starch oxidized using Fenton-like system and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]Take a certain amount of corn starch and add it to a three-necked bottle, add distilled water to prepare a 40wt% starch suspension, heat and gelatinize in a water bath at 65°C for 1 hour, and add cerium nitrate (2wt% ), cuprous sulfate (0.008wt%), adjust the pH of the reaction solution to 3.0, keep the temperature at 35°C, slowly add hydrogen peroxide (12wt%) dropwise after 12 hours, and suction filter after stirring and reacting for 6 hours at 40°C. The cake was washed with acetone and dried in a vacuum oven at 60°C to obtain the product. The measured carbonyl content of the product is 13.40%, and the carboxyl content is 3.10%.

Embodiment 2

[0035] Take a certain amount of corn starch and add it to a three-necked bottle, add distilled water to prepare a 40wt% starch suspension, heat and gelatinize it in a water bath at 65°C for 1 hour, and add cerium nitrate (1wt% ), cuprous sulfate (0.008wt%), adjust the pH of the reaction solution to 3.0, keep the temperature at 35°C, slowly add hydrogen peroxide (12wt%) dropwise after 12 hours, and suction filter after stirring and reacting for 6 hours at 40°C. The cake was washed with acetone and dried in a vacuum oven at 60°C to obtain the product. The measured carbonyl content of the product is 10%, and the carboxyl content is 5.80%.

Embodiment 3

[0037] Take a certain amount of corn starch and add it to a three-necked bottle, add distilled water to prepare a 40wt% starch suspension, heat and gelatinize in a water bath at 65°C for 1 hour, and add cerium nitrate (3wt% ), ferrous sulfate (0.005wt%), adjust the pH of the reaction solution to 3.0, keep the temperature at 35°C, slowly add hydrogen peroxide (10wt%) dropwise after 12 hours, and suction filter after stirring and reacting for 6 hours at 40°C. The cake was washed with acetone and dried in a vacuum oven at 60°C to obtain the product. The measured carbonyl content of the product is 15.94%, and the carboxyl content is 2.99%.

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Abstract

The invention discloses a carbonyl starch oxidized by a Fenton similar system, and a preparation method of the carbonyl starch. The Fenton similar system is composed of a cerous nitrate salt-a catalyst-H2O2; the catalyst is ferrous sulfate or cuprous sulfateb; starch is oxidized in aqueous phase at a temperature of 20 to 60 DEG C. The preparation method comprises following steps: (1) 30 to 50 weight portions of starch and 60 to 170 weight portions of water are mixed so as to obtain a turbid liquid, and the turbid liquid is subjected to gelatinization in water bath for 0.5 to 2h at a temperature of 50 to 70 DEG C; (2) 0.3 to 2.0 weight portions of ceric ammonium nitrate and 0.0015 to 0.0075 weight portion of the catalyst are added and mixed fully, pH value of the reaction solution is adjusted to 2.5 to 4.0, and the reaction solution is reacted for 10 to 24h at a temperature of 20 to 45 DEG C in enclosed conditions; (3) 1.5 to 10 weight portions of H2O2 is added, the temperature is adjusted to 45 to 60 DEG C, and the mixture is reacted for 3 to 7h; and (4) after that, the mixture is subjected to suction filtration, is washed for 3 times with acetone, and is dried in a vacuum oven for 12 to 24h at a temperature of 40 to 60 DEG C so as to obtain the carbonyl starch containing 10 to 20% of carbonyl and 2 to 6% of carboxyl. According to the preparation method, both carbonyl and carboxyl are introduced into starch at the same time, so that functional groups of starch molecules are increased, and application area of oxidized starch is widened.

Description

technical field [0001] The invention relates to carbonyl starch oxidized by a Fenton-like system and a preparation method thereof, belonging to the field of functional polymers. Background technique [0002] Starch is a kind of semi-crystalline chain-like natural high molecular polymer formed by polycondensation of α-D-glucose through α-1,4-glucosidic bonds. There are two forms of straight chain and branched chain, and its distribution in nature is very It is widely found in the roots, stems, leaves, fruits and other organs of higher plants, and is obtained by plants converting carbon dioxide and water through photosynthesis. X-ray and nuclear magnetic resonance experiments show that amylose is coiled and coiled and in a left-helical state, often intertwined with the cluster structure of amylopectin [Liu Can, Gu Jiyou, Zhang Yanhua. Journal of Central South University of Forestry and Technology, 2012, 32 (4): 177-180.], so two adjacent glucose chains can be linked together ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B31/18
Inventor 王亚娟单志华蒋岚邵双喜邬宁昆刘丹维
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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