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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hot water cooking under general conditions cannot deacetylate the hemicellulose in the plant material, let alone dissolve the large molecule lignin

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

Embodiment 1

[0024] Take 10g of bagasse, put it in a 250ml Erlenmeyer flask, add 80mL of pretreatment solution, the pretreatment solution is 10g / L NaOH aqueous solution, soak the bagasse and immediately pour out 50mL of the liquid, the remaining solid-liquid ratio is 1:3, put Heat to 100°C in a sterilizing pot, heat-preserve and cook for 10 minutes, take out the triangular flask (pH of the mixture after cooking in the triangular flask=11), press out the liquid, wash the residue once with water, combine the two filtrates, a total of 50mL, namely For the pretreatment of waste water, its pH=10.5, and the concentration of acetate in it was determined to be 0.19%.

Embodiment 2

[0026] The unpretreated bagasse 100g (the same batch of raw materials as in Example 1) and all the remaining solids after the pretreatment in Example 1 were used to extract hemicellulose by alkaline method respectively.

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

[0028]Carry out acetate, NaOH concentration, color and luster to the obtained hemicellulose extracting liquid then and measure contrast, and with the 95% (v / v) ethanol alcohol precipitation that is equivalent to 3 times of extracting liquid volume, 75% ethanol washing hemicellulose, Finally, the color and purity of the dried hemicellulose powder were compared, and the results are shown in Table 1.

[0029] Table 1: whether to adopt the method pretreatment of the present invention to the impact of bagasse extraction hemicellulose result...

Embodiment 3

[0033] Take 100g of corn cobs, crush them (thickness is 0.8-5cm), add 400mL of pretreatment solvent, the pretreatment solvent is 6g / L NaOH aqueous solution, put it in a sterilizer and raise the temperature to 100°C, keep it warm for 20min, and take out the triangular corncob. bottle (pH=10 of the mixture after cooking in the Erlenmeyer flask), press out the liquid, and measure the acetate concentration in the filtrate to be 0.45%. The filter residue was washed once with hot water, squeezed and dried in the air 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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