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Konjak oligosaccharide preparation method

A technology of konjac oligosaccharides and konjac fine powder, which is applied in the field of natural polymer chemistry, can solve the hidden dangers of radioactive pollution and the difficulty of obtaining radiation sources, etc., and achieve the effects of expanding the application range, easy control of molecular weight, and simple equipment

Active Publication Date: 2008-03-26
武汉拓扑科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the radiation source is not easy to obtain, and there is a hidden danger of radioactive contamination

Method used

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  • Konjak oligosaccharide preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Get commercially available konjac fine powder and configure it into 0.5% (percentage by weight) hydrosol, pave it into a 18mm thick glass container with a flat bottom, and place it under an ultraviolet lamp (wavelength 254nm, power is 30 watts) at 15cm to irradiate respectively 1, 3, 6 , 9 minutes, the product was precipitated with 4 times the volume of 95% ethanol, filtered under reduced pressure, and vacuum-dried, with an average yield of 85%.

Embodiment 2

[0019] Get commercially available konjac fine powder and configure it into 1% (percentage by weight) hydrosol, pave it into a 5mm thick glass container with a flat bottom, and place it under an ultraviolet lamp (wavelength 254nm, power is 30 watts) at 20cm to irradiate respectively 2, 3, 4 , 6 minutes, the product was freeze-dried, and the yields were above 95%. Take the products respectively to form an aqueous solution with a concentration of less than 0.05g / 100mL, and measure the intrinsic viscosity at 30±0.1°C. According to the relational formula [η]=5.06×10 -4 mw 0.754 The calculated molecular weights of konjac oligosaccharides were 89500, 26400, 13700 and 9420, respectively, and the molecular weight of konjac fine powder without UV irradiation treatment was 490000.

Embodiment 3

[0021] Get commercially available konjac fine powder and be configured into 2% (percentage by weight) hydrosol, pave into 4mm thick in flat-bottomed glass container, place ultraviolet lamp (wavelength 254nm, power is 30 watts) and irradiate respectively 3,6,9 at 20cm. , 12 minutes, the product was precipitated with 4 times the volume of 95% ethanol, filtered under reduced pressure, and vacuum-dried, with an average yield of 86.3%. Take the products respectively to form an aqueous solution with a concentration of less than 0.05g / 100mL, and measure the intrinsic viscosity at 30±0.1°C. According to the relational formula [η]=5.06×10 -4 mw 0.754 The calculated molecular weights of konjac oligosaccharides were 72800, 39300, 12100, 3150, respectively, and the molecular weight of konjac fine powder without UV irradiation treatment was 490000.

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Abstract

The invention discloses a preparation method for konjak oligosaccharide, which comprises, using UV to irradiate the hydrosol of konjak refine powder, freeze drying, or spray drying, or ethanol deposition filter drying. This invention is simple and convenient to control and repeat, has high yield and low cost, and fit to rapid preparation in small scale in production in large scale. The product holds the chemical constitution of konjak glucomannan and character of heating to form gel, and can be used in food, health products and drug.

Description

technical field [0001] The invention relates to a preparation method of konjac oligosaccharides. It belongs to the field of natural polymer chemistry. Background technique [0002] Konjac glucomannan is the main component of konjac, and its content in dry konjac tubers is as high as 55% to 60%. It is composed of D-glucose and D-mannose at a molar ratio of 1:1.6 or 1:1.69 through β- 1,4-pyranoside-bonded heteropolysaccharides, konjac glucomannan usually has short branched chains and contains a small amount of acetyl groups. As a natural polymer polysaccharide, konjac glucomannan has many good properties. Such as biocompatibility, film formation, biodegradability, etc., it has a wide range of uses in food, medicine, biochemical, chemical, textile, petroleum, cosmetics and other industries. The molecular weight of konjac glucomannan can generally reach 10 6 On the one hand, high molecular weight makes it have excellent thickening and gelling properties, but on the other hand...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07H3/06C07H1/00
Inventor 刘芝兰王艳伟卓仁禧
Owner 武汉拓扑科技发展有限公司