Method for preparing gluconic acid from mother liquor of xylose crystalline liquid

A technology of gluconic acid and crystallization mother liquor, which is applied in the direction of fermentation and the like, can solve the problems of inability to oxidize glucose exclusively, low purity of gluconic acid, poor quality, etc., and achieves the effects of low production cost, easy popularization and application, and good quality.

Inactive Publication Date: 2009-09-23
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is to purify gluconic acid by using the principle that gluconic acid is negatively charged. Its main disadvantage is that non-biological oxidants cannot specifically oxidize glucose or other monosaccharides, and can only obt

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for preparing gluconic acid from xylose crystallization mother liquor, its concrete steps are as follows:

[0023] (1) Decolorization

[0024] Using xylose crystallization mother liquor industrial waste as raw material, first add pure water to the xylose crystallization mother liquor according to the ratio of xylose crystallization mother liquor volume: pure water volume ratio of 1:5, stir evenly to dilute, and pump the diluent into the nanofilter, use a nanofiltration membrane with a molecular weight cut-off of 2000Da to perform nanofiltration decolorization treatment, collect the nanofiltration decolorization liquid and the retained liquid respectively, and use the nanofiltration decolorized liquid for the next step to carry out enzyme oxidation, and for the retained liquid, pass through the interlayer The pot is concentrated into a slurry at 80°C, and the caramel coloring is prepared.

[0025] (2) Enzyme oxidation, ultrafiltration

[0026] After the first ...

Embodiment 2

[0032] A method for preparing gluconic acid from xylose crystallization mother liquor, the specific steps are as follows:

[0033] (1) Decolorization

[0034] With embodiment 1, it is characterized in that: the volume of xylose crystallization mother liquor: pure water volume ratio is 1: 7.5; Use the nanofiltration membrane that cut-off molecular weight is 4000Da to carry out decolorization treatment; For intercepted liquid, concentrate into slurry at 100 ℃ through the jacketed pot shape.

[0035] (2) Enzyme oxidation, ultrafiltration

[0036] Same as Example 1, characterized in that: the mass of glucose oxidase powder: the volume ratio of nanofiltration decolorization solution is 1:375, and the enzyme is oxidized with stirring for 45 minutes at a temperature of 55°C. The feed additive with a protein content of 60% is prepared by using an ultrafiltration membrane with a molecular weight cut-off of 30,000 Da, performing ultrafiltration at 0.2 MPa, and spray-drying it at 135° ...

Embodiment 3

[0042] A method for preparing gluconic acid from xylose crystallization mother liquor, the specific steps are as follows:

[0043] (1) Decolorization

[0044] With embodiment 1, it is characterized in that: xylose crystallization mother liquor volume: the ratio of pure water volume ratio is 1: 10; Carry out nanofiltration decolorization treatment with the nanofiltration membrane that molecular weight cut off is 6000Da; °C concentrated into a slurry.

[0045](2) Enzyme oxidation, ultrafiltration

[0046] Same as Example 1, characterized in that: the mass of glucose oxidase powder: the volume ratio of nanofiltration decolorization solution is 1:500, and the enzyme is oxidized with stirring for 60 minutes at a temperature of 60°C. The feed additive with a protein content of 70% is prepared by using an ultrafiltration membrane with a molecular weight cut-off of 30,000 Da, performing ultrafiltration at 0.3 MPa, and spray-drying it at 150° C.

[0047] (3) Electrodialysis

[0048...

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Abstract

The invention discloses a method for preparing gluconic acid from mother liquid of xylose crystalline liquid, and relates to a preparation method of gluconic acid. The method takes industrial waste of mother liquor of xylose crystals as raw material and obtains the product by decolorization, enzymic oxidation, ultrafiltration, electrodialysis and concentration and drying. The invention is characterized by being capable of fully utilizing the industrial waste of mother liquor of xylose crystals to prepare various products including the gluconic acid, caramel pigment and protein feed, and good quality of the prepared gluconic acid with the purity being up to 98.6 percent; and also by simple method, convenient operation, low production cost, easy popularization and application and the like; and opens up a new way for the resource utilization of industrial waste of mother liquor of xylose crystals. The products prepared by the method can be widely applied as metal ion chelation agent, acid agent and coloring agent in the industries of food, medicine and electroplating and the like, as anti-aging agent in cosmetics and as feed additive and the like.

Description

1. Technical field [0001] The invention belongs to the technical field of preparation methods of gluconic acid, in particular to a preparation method of gluconic acid. 2. Background technology [0002] Gluconic acid is an important raw material for medicine and food production. Molecular formula: C 6 h 12 o 7 , Widely used as a masking agent for metal ions, food sour agent, scale cleaning agent, milk stone removal agent for dairy equipment, etc.; its calcium salt, ferrous salt, bismuth salt and other salts are used in medicine. In addition, gluconic acid can promote the proliferation of bifidobacteria, and has health care and anti-aging effects. [0003] Glucose is the main energy source of the human body, but diabetic patients have low tolerance to glucose and cannot use glucose as a sweetener. Therefore, xylitol has become the main sweetener for diabetic patients, and is also used as a low-calorie food and health care product of sweeteners. Xylitol is formed by hydrog...

Claims

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Application Information

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IPC IPC(8): C12P7/58
Inventor 魏顺安周小华赵成霞金挺桑鲁燕陈林苏霞利廖妙飞
Owner CHONGQING UNIV
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