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Degradation method of konjac glucomannan

A technology of konjac glucomannan and konjac flour, which is applied in the field of degradation of konjac glucomannan, can solve the problems of energy consumption and time-consuming, and achieve the effect of saving degradation cost and simple operation steps

Active Publication Date: 2020-07-10
HUAZHONG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In the homogeneous degradation reaction, the konjac glucomannan needs to be made into a hydrosol first, and the viscosity of the system will increase sharply with the increase of the concentration of the substrate konjac glucomannan. A large amount of target product is obtained, and after the reaction, the solvent whose mass is tens of times that of the target product needs to be removed, which is extremely energy-consuming and time-consuming

Method used

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Examples

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Embodiment 1

[0032] The present embodiment provides a kind of degradation method of konjac glucomannan, comprising the following steps:

[0033] S1, preparation of water-containing konjac flour mixture: take 0.5kg of purified konjac powder (glucomannan content ≥ 90%, molecular weight 1133.6kDa), add 20% distilled water by weight, grind to make water and polysaccharide fully mix, get water-containing konjac powder mixture.

[0034] S2, heterogeneous wet heat degradation: the aqueous konjac flour mixture prepared in step S1 was placed in a sealed heating device, and the following process parameters were adopted: degradation temperature of 130°C, degradation pressure of 0.275 MPa, and degradation time of 30 minutes to obtain low molecular weight konjac polysaccharides.

[0035] S3, drying: take the low-molecular-weight konjac polysaccharide prepared in step S2 and place it in a blast drying oven, and dry it at 80° C. to a constant weight to obtain degraded konjac glucomannan, that is, degrade...

Embodiment 2

[0037] The present embodiment provides a kind of degradation method of konjac glucomannan, comprising the following steps:

[0038] S1, preparation of aqueous konjac flour mixture: 0.5kg of purified konjac powder (glucomannan content ≥ 90%, molecular weight 1133.6kDa), add 5% distilled water by weight, grind to make water and polysaccharide fully mix, get aqueous konjac flour mixture .

[0039] S2, heterogeneous wet heat degradation: the aqueous konjac flour mixture prepared in step S1 was placed in a sealed heating device, and the following process parameters were adopted: degradation temperature of 130°C, degradation pressure of 0.275 MPa, and degradation time of 30 minutes to obtain low molecular weight konjac polysaccharides.

[0040] S3, drying: take the low-molecular-weight konjac polysaccharide prepared in step S2, place it in a forced air drying oven, and dry it at 80° C. to constant weight to obtain degraded konjac flour.

Embodiment 3

[0042] This example provides a degradation method of konjac glucomannan, the raw materials and process steps used are basically the same as those in Example 1, the difference is that in step S1, the water-containing konjac flour mixture contains 40% water.

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Abstract

The invention relates to a degradation method of konjac glucomannan, which comprises the following steps: preparing a water-containing konjac flour mixture of which the water content is 5-60%; and carrying out heterogeneous damp-heat degradation on the water-containing konjaku flour mixture to obtain a low-molecular-weight konjaku polysaccharide degradation product. According to the degradation method, a heterogeneous system is adopted for degradation reaction; time-consuming and energy-consuming dehydration operation after degradation of the konjac glucomannan homogeneous phase (prepared intosol) can be avoided; meanwhile, organic solvents such as ethyl alcohol used for limiting swelling of konjac polysaccharide in other heterogeneous degradation methods can be avoided, operation steps are simple, time is saved, efficiency is high, the molecular weight distribution range of degradation products can be adjusted by controlling reaction conditions, and large-scale production is facilitated.

Description

technical field [0001] The invention relates to the field of natural polymer processing, in particular to a degradation method of konjac glucomannan. Background technique [0002] Konjac glucomannan is a natural polymer heteropolysaccharide derived from the herbaceous plant Konjac, which is connected by β-1,4 glycosidic bonds by β-D-glucose and β-D-mannose in a molar ratio of about 2:3 Formed, the C3 position of mannose in the main chain forms a branched chain through the combination of β-1,3 glycosidic bonds, and its relative molecular mass is about 200-2000kDa. Konjac glucomannan has gelling properties, film-forming properties, and biocompatibility, and can be used in the fields of food, cosmetics, pharmaceuticals, and health products. [0003] Studies have shown that the larger the molecular weight of konjac glucomannan, the higher the viscosity of its hydrosol. Natural konjac glucomannan is used as a thickener and stabilizer because of its extremely high viscosity. How...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/00
CPCC08B37/009
Inventor 李晶商龙臣李斌陈园园陈致君刘石林梁宏闪宋蓉占福朝
Owner HUAZHONG AGRI UNIV
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