Straw pretreatment method for hemicellulose production

A technology of straw pretreatment and hemicellulose is applied in the field of extraction of active ingredients in straw, which can solve the problems of inability to dissolve and fall off lignin, incapability of deacetylation reaction of hemicellulose, avoid dark color and facilitate clean production. , the effect of reducing the acetate concentration

Active Publication Date: 2015-06-03
GUANGXI INST OF BOTANY THE CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hot water cooking under general conditions cannot deacetylate the hem

Method used

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  • Straw pretreatment method for hemicellulose production
  • Straw pretreatment method for hemicellulose production
  • Straw pretreatment method for hemicellulose production

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0023] Example 1

[0024] Take 10g bagasse and place it in a 250ml Erlenmeyer flask, add 80mL of pretreatment liquid, 10g / L NaOH aqueous solution, and pour out 50ml of liquid immediately after the bagasse is soaked, and the remaining solid-liquid ratio is 1:3. Heat to 100°C in a sterilization pot, keep cooking for 10 minutes, take out the Erlenmeyer flask (pH of the cooked mixture in the Erlenmeyer flask = 11), press out the liquid, wash the residue with water once, combine the two filtrates, a total of 50mL, that is To pre-treat the wastewater, its pH=10.5, and the acetate concentration is determined to be 0.19%.

Example Embodiment

[0025] Example 2

[0026] 100 g of bagasse that has not undergone pretreatment (the same batch of raw material as the raw material of Example 1) and all the solids remaining after the pretreatment of Example 1 are respectively used to extract hemicellulose by the alkaline method.

[0027] The extraction conditions are: solid-liquid ratio 1:5, the lye used for extraction is an aqueous NaOH solution with a concentration of 8% (w / v), the extraction time is 12 hours, and the temperature is room temperature.

[0028] Then, the acetate, NaOH concentration and color of the obtained hemicellulose extract were measured and compared, and the hemicellulose was washed with 95% (v / v) ethanol equivalent to 3 times the volume of the extract, and the hemicellulose was washed with 75% ethanol. Finally, the color and purity of the dried hemicellulose powder were compared, and the results are shown in Table 1.

[0029] Table 1: Whether the method of the present invention is used for pretreatment affects...

Example Embodiment

[0032] Example 3

[0033] Take 100g of corncob, after flattening treatment (thickness 0.8~5cm), add 400mL of pretreatment solvent, 6g / L NaOH aqueous solution, place in a sterilization pot and heat up to 100℃, keep warm and cook for 20min, take out the triangle Bottle (pH of the cooked mixture in the Erlenmeyer flask = 10), press out the liquid, and determine the acetate concentration in the filtrate to be 0.45%. The filter residue is washed once with hot water, squeezed out and then dried for hemicellulose extraction.

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Abstract

The invention discloses a straw pretreatment method for hemicellulose production. The method comprises the following steps: mixing the straw with a pretreatment solution, insulating and boiling the obtained mixture for 0-60 min under a heating condition, performing solid-liquid separation on the boiled mixture, collecting the solid, rinsing for extracting the hemicellulose; and the pretreatment solution is an alkaline solution with the concentration of 1-20g/L, and the dosage of the pretreatment solution is the amount when the pH value of the boiled mixture is controlled to 10-11. The hemicellulose deacetylation reaction and the raw material cleaning and purifying process are integrated to a pretreatment step, so that the hemicelluloses alkali dissolution and extraction is the other independent process, and the problems of dark color of the product hemicellulose directly extracted by alkali liquor, the difficult guarantee of the food sanitation, the nonrenewable acetates in the extracted alkali liquor through a film filtering method, and the dark color of the product can be effectively avoided.

Description

technical field [0001] The invention relates to the extraction of active components in straw, in particular to a straw pretreatment method for hemicellulose production. Background technique [0002] Hemicellulose is a component of plant cell walls, a renewable polysaccharide second only to cellulose in nature, and its content in the skin and straw of various grains reaches 15-40% of the dry weight of the material. It is a resource with important development significance. [0003] Utilization as dietary fiber is an important application direction of hemicellulose. In order to improve the safety of food hygiene, hemicellulose is extracted for the purpose of food application, and the raw materials are pretreated to remove possible harmful substances such as fungi. Toxicity, pesticide residues, are essential to improve product safety. [0004] There is a tight bond between the hemicellulose and lignin in the straw, and it is also soluble in alkaline solution, which makes it di...

Claims

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Application Information

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IPC IPC(8): C08B37/14
Inventor 周玉恒陈海珊石国良蔡爱华
Owner GUANGXI INST OF BOTANY THE CHINESE ACAD OF SCI
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