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Method for esterification reaction of konjac glucomannan

A technology of konjac glucomannan and glucomannan ester, which is applied in the field of mechanochemistry and achieves the effects of short time consumption, low cost and easy operation

Inactive Publication Date: 2011-01-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many studies focus on the micronization and activation treatment of powder by mechanochemistry, while the research on esterification reaction by mechanochemistry has not been reported yet.

Method used

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  • Method for esterification reaction of konjac glucomannan
  • Method for esterification reaction of konjac glucomannan

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 50 grams of konjac glucomannan is carried out esterification:

[0021] Step 1: Dry konjac glucomannan at 60°C with a blower until the water content is 3%, weigh 50 g, and add 0.5 g of sodium hexametaphosphate as an esterification modifier;

[0022] The second step: Prepare the grinding medium according to the volume filling rate of 80% of the grinding tank of the vibratory mill. Alloy balls with diameters of 15 mm, 8 mm and 6 mm are used as the grinding medium, and the volume ratio of the three balls is 28:42: 30;

[0023] Step 3: Mix the above-mentioned konjac glucomannan and the grinding medium evenly, then add it into the above-mentioned grinding tank, seal the grinding tank, and start the vibrating mill to grind for 20 minutes;

[0024] Step 4: Separating the grinding medium from the sample by sieving to obtain the esterified konjac glucomannan.

[0025] The digestion-spectrophotometer data picture of gained konjac glucomannan sample figure 1 As shown, the optica...

Embodiment 2

[0028] 50 grams of konjac glucomannan is carried out esterification:

[0029] Step 1: Dry konjac glucomannan in a vacuum oven at 80°C until the water content is 2%, weigh 50 g of dried konjac glucomannan, and add 2.5 grams of sodium trimetaphosphate as a modifier;

[0030] The second step: Prepare the grinding medium according to the volume filling rate of 85% of the grinding jar of the vibrating mill, using zirconia balls with diameters of 15 mm and 8 mm respectively as the grinding medium, and the volume ratio of the two kinds of zirconia balls is 2:1;

[0031] Step 3: Mix the above-mentioned konjac glucomannan and the grinding medium evenly, then add it into the above-mentioned grinding tank, seal the grinding tank, and start the vibrating mill to grind for 30 minutes;

[0032] Step 4: Separating the grinding medium from the sample by sieving to obtain the konjac glucomannan of the esterification reaction.

[0033] Table 1 is the X-ray fluorescence spectrum test data of th...

Embodiment 3

[0038] 50 grams of konjac glucomannan is carried out esterification:

[0039] Step 1: Dry konjac glucomannan at 70°C with a blower dryer until the water content is 3%, weigh 50g of dried konjac glucomannan, add 0.25g of sodium pyrophosphate as a modification agent;

[0040] Step 2: Prepare the grinding medium according to the volume filling rate of 90% of the grinding tank of the vibrating mill, using alumina balls with diameters of 8 mm and 6 mm respectively as the grinding medium, and the volume ratio of the two kinds of alumina balls is 1:1;

[0041] Step 3: Mix the above-mentioned konjac glucomannan and the grinding medium evenly and add it into the above-mentioned grinding tank, seal the grinding tank, and start the vibrating mill to grind for 60 minutes;

[0042] Step 4: Separating the grinding medium from the sample by sieving to obtain the konjac glucomannan of the esterification reaction. The infrared spectrum test results of the samples are as follows: figure 2 s...

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Abstract

The invention provides a method for an esterification reaction of konjac glucomannan. The method adopts a mechanical chemical method and comprises the following steps of: 1, drying the konjac glucomannan until the water content of the konjac glucomannan is less than 4 percent and adding an esterification modifier in an amount of 0.5 to 5 percent based on the total mass of the konjac glucomannan; 2, preparing a grinding medium according to the volume filling rate of 50 to 90 percent of a grinding tank of a vibrating mill; 3, uniformly mixing the konjac glucomannan and the grinding medium, adding the mixture into the grinding tank of the vibrating mill, sealing the grinding tank and starting the vibrating mill to grind for 20 to 60 minutes; and 4, separating the grinding medium from a sample by screening so as to obtain the konjac glucomannan prepared by the esterification reaction. The method for the esterification reaction of the konjac glucomannan provided by the invention adopts the mechanical chemical method and has the advantages of simple and convenient operation, low cost, no pollution and capability of possibly meeting the requirement of industrialized production on different application performance of the konjac glucomannan.

Description

technical field [0001] The invention relates to a mechanochemical method for the esterification reaction of konjac glucomannan. Background technique [0002] Konjac glucomannan (KGM for short) is a natural polysaccharide extracted from the Araceae plant-Konjac bulb, and is the most viscous vegetable gum known in nature. Because of its good film-forming and water-absorbing properties, it is widely used as polymer materials such as membrane materials, chromatographic fillers, flocculants, and water-absorbing agents. KGM is composed of D-glucose and D-mannose connected by β-1, 4 glycosidic bonds in a ratio of about 1:1.5, and there are β-1, 3 glycosidic bonds at the C-3 position of some sugar residues Each branch has several to dozens of sugar residues, and there is one acetyl group bonded by an ester bond for every 19 sugar residues on the main chain. The esterification reaction of konjac glucomannan under acidic conditions can improve the viscosity, stability and antibacter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/02
Inventor 潘志东孟俊杰王燕民
Owner SOUTH CHINA UNIV OF TECH
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