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Method for preparing low-molecular-weight guar gum

A low molecular weight, guar gum technology, applied in the field of natural polymer chemistry, can solve the problems of residues, poor process control repeatability, complex separation and purification process, etc., and achieve the effect of simple equipment, easy control of molecular weight, and simple and fast process

Inactive Publication Date: 2011-06-15
武汉拓扑科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Low-molecular-weight guar gum is usually obtained by enzymatically degrading guar gum. In the preparation process, expensive enzymes are used, and the product requires a complicated separation and purification process, and the enzyme may remain in the product. The repeatability of process control is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Get commercially available guar gum powder and mix it into 0.5% hydrosol, spread it in a flat-bottomed glass container to a thickness of 20 mm, and place it under a UV lamp (wavelength 254 nm, power 40 watts) at 5 cm to irradiate for 5, 15, 30, and 60 minutes respectively , the product was filtered through a 120-mesh sieve, precipitated with 4 times the volume of 95% ethanol, filtered under reduced pressure, and dried in vacuum, with an average yield of 80%.

Embodiment 2

[0017] Take commercially available guar gum powder and prepare it into 1% hydrosol, spread it in a flat-bottomed glass container to a thickness of 5 mm, and place it under a UV lamp (wavelength 254 nm, power 40 watts) at 5 cm to irradiate for 5, 15, 30, and 45 minutes respectively , the product is lyophilized after filtering through a 120-mesh sieve, and the yields are all above 85%. Take the products respectively to form an aqueous solution with a concentration of less than 0.05g / 100mL, measure the intrinsic viscosity at 30±0.1°C, and calculate the molecular weights of low-molecular-weight guar gum to be 95500, 31400, 18500, and 11400, respectively. The molecular weight of the gum is 220,000.

Embodiment 3

[0019] Get commercially available guar gum powder and mix it into 2% hydrosol, spread it in a flat-bottomed glass container to a thickness of 4 mm, and place it under a UV lamp (wavelength 254 nm, power 40 watts) at 5 cm to irradiate for 15, 30, 45, and 60 minutes respectively , the product was filtered through a 120-mesh sieve, precipitated with 4 times the volume of 95% ethanol, filtered under reduced pressure, and dried in vacuum, with an average yield of 80%. Take the products respectively to form an aqueous solution with a concentration of less than 0.05g / 100mL, measure the intrinsic viscosity at 30±0.1°C, and calculate the molecular weights of low-molecular-weight guar gum to be 79800, 44300, 17500, and 4500, respectively. The molecular weight of the gum is 220,000.

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Abstract

The invention discloses a method for preparing low-molecular-weight guar gum, which comprises the following steps: irradiating guar gum hydrosol with 200-450-nanometer ultraviolet light; and obtaining solid low-molecular-weight guar gum through freeze-drying, spray drying or ethanol precipitation filtration drying. The method can obtain an oligosaccharide (a polysaccharide consisting of 2 to 10 sugar units), has the advantages of simplicity, convenience and quickness, high yield, easily-controllable molecular weight, good reproducibility, simple process equipment, safety and no pollution, lowcost and the like, and can be applied to rapid preparation of a small amount of low-molecular-weight guar gum, and can be further industrialized and applied to the production of a large amount of low-molecular-weight guar gum. The obtained product can be used for the production of foods and health products, and can also be used as medicine and chemical raw materials.

Description

technical field [0001] The invention relates to a preparation method of low molecular weight guar gum, which belongs to the field of natural polymer chemistry. Background technique [0002] Guar gum is a natural polysaccharide extracted from guar beans, a leguminous plant widely grown in the Indian-Pakistani subcontinent. Due to its unique molecular structure and naturalness, it has been used in food, pharmaceuticals, cosmetics, personal health care, petroleum, adhesives, papermaking and textile printing and dyeing industries. [0003] The molecular structure of guar gum is a kind of non-ionic polysaccharide, which takes polymannose as the molecular backbone, D-mannopyranose units are connected by β (1-4) glycosidic bonds, and D-galactopyranose is It is connected to the main chain of polymannose by α(1-6) glycosidic bonds. The molar ratio of mannose to galactose units in guar gum is 2:1. It is reported in the literature that the molecular weight of guar gum is around 200,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B37/00
Inventor 董夏青
Owner 武汉拓扑科技发展有限公司
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