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A technology of xylo-oligosaccharide and yield, applied in the fields of food and chemical industry, can solve the problems of no further processing of hydrolysis residue, waste of hemicellulose components, complicated process flow, etc. Residual reduction effect
Inactive Publication Date: 2016-04-06
INST OF PROCESS ENG CHINESE ACAD OF SCI
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[0003] China Agricultural University disclosed the "preparation method of xylooligosaccharides" (application number 01131171.1), using various corn cobs as raw materials, after pretreatment with alkali metal hydroxides, direct pyrolysis under the action of a weak acid catalyst, and then using Enzymatic preparation of xylo-oligosaccharides, and finally refined to obtain high-purity xylo-oligosaccharide products, but the yield of this invention is low, and there is no further treatment of the hydrolysis residue, resulting in the waste of some hemicellulose components
Li Xiufang and others disclosed "the method of using biological straw to prepare xylo-oligosaccharides, dissolving pulp and bio-fuel". The residual enzymolysis slag after enzymolysis was pulped, washed and screened, delignified, pretreated, and bleached. Prepare a series of treatments such as dissolving pulp, so as to utilize the enzymolysis residue. The process of this invention is complicated and consumes a lot of energy
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Embodiment 1
[0020] Raw material preparation: After the corn stalks are air-dried, use a high-speed mill to pulverize them until the particle size is below 2mm; Raw material processing: Put the above corn stalk powder into a heat-resistant container, soak in boiling water for 2 hours, separate the solid-liquid to take the filter residue, and use it again for 80 Soak in % ethanol for 2 hours to remove water-soluble and fat-soluble impurities in the corn stalk raw material, separate the solid-liquid from the treated mixture and take the filter residue, dry at 60°C until the solid content is greater than 90%, and then mix with 1:10 (w / v) Solid-to-liquid ratio Add 6% (w / v) sodium chlorite, and use 10% (w / v) HAc to adjust the pH to 3.6-3.8, then treat at 75°C for 4h; xylan preparation: the above Treat corn stalks with 10% (w / v) NaOH solution, set the solid-to-liquid ratio of 1:10 (w / v), treat at 105°C for 2 hours, and take the filtrate after solid-liquid separation; adjust the filtrate with con...
Embodiment 2
[0023] The preparation, enzymatic hydrolysis, purification steps and related parameters of xylan in this example are the same as those in Example 1. In the subsequent steps, 0.8% (v / v) acetic acid was used for acid hydrolysis at 140° C. for 60 minutes.
[0024] It was determined that under this condition, the yield of xylooligosaccharides in the acid hydrolysis process was 6.4%, the total yield of xylooligosaccharides reached 49%, and the total yield of monosaccharides reached 11.2%, that is, the total yield of sugars was 60.2%.
Embodiment 3
[0026] The preparation, enzymatic hydrolysis, purification steps and related parameters of xylan in this example are the same as those in Example 1. In the subsequent steps, 1% (v / v) acetic acid was used for acid hydrolysis at 160° C. for 120 minutes.
[0027] It was determined that under this condition, the yield of xylooligosaccharides in the acid hydrolysis process was 9.7%, the total yield of xylooligosaccharides reached 52.3%, and the total yield of monosaccharides reached 14.6%, that is, the yield of total sugars was 66.9%.
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Abstract
The invention discloses a method for raising the yield of xylooligosaccharide and belongs to the fields of chemical engineering and food. The method comprises of treating corn straw as the raw material, firstly, sequentially conducting air drying and pulverization, conducting soaking treatment with water and ethyl alcohol for removing water soluble impurities and fat soluble impurities in the raw material, and then conducting lignin removal treatment through a sodium chlorite method; secondly, obtaining a xylan extracting solution through an alkaline extraction method, and after pH is adjusted to be neutral, conducting concentration for removing salt; finally, conducting depolymerization treatment on xylan through an enzymolysis method and an acidolysis method in sequence, and conducting centrifugation, activated carbon treatment and freeze-drying, so that a xylooligosaccharide product is obtained. The method has the following advantages that xylan liquid obtained through the method is subjected to a hydrolysis reaction, and the complex separating and drying steps in the preparation process are omitted; enzymolysis residues are subjected to acetic acid treatment at the high temperature, the yield of the xylooligosaccharide can be raised, and no excessive influence can be caused to the acidic and basic property of the product; the straw is utilized as the raw material, so that good economic benefits and ecological significance are achieved.
Description
technical field [0001] The invention relates to a method for increasing the yield of xylooligosaccharides, which belongs to the technical fields of chemical industry and food. Background technique [0002] At present, the hydrolysis methods for degrading hemicellulose into xylooligosaccharides are mainly divided into four types: enzymatic hydrolysis, acid hydrolysis, self-hydrolysis, and chemical enzymatic hydrolysis. Among them, enzymatic hydrolysis relies on its mild reaction conditions and low pollution. , has become the mainstream method for the preparation of xylooligosaccharides. However, at present, the yield of xylo-oligosaccharides produced by single enzymatic or acid hydrolysis is generally not high. Insufficient binding sites for enzymes and sugars, etc. Acid degradation is more thorough, but there is no specificity of bond breaking. Therefore, if a method of organically combining enzymatic hydrolysis and acid hydrolysis to achieve a higher yield of xylo-oligos...
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