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A kind of extraction method of xylan in hickory nut shell

A pecan shell and extraction method technology, which is applied in the production and technical application fields of plant polysaccharides, can solve the problems such as the destruction or degradation of xylan molecules, the high residual rate of pigments and impurities, and the complex decolorization and purification process, and achieves mild extraction conditions. , high product purity, reducing the effect of extraction process steps

Active Publication Date: 2020-04-28
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of these methods require long-term heating, which is easy to damage or degrade xylan molecules. At the same time, the residual rate of pigments and impurities is high, and a complex decolorization and purification process is required; in addition, acid-base reagents severely corrode equipment and consume high energy consumption.
At present, there is no report on the use of this technology to assist in the extraction of xylan from hickory nut shells

Method used

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  • A kind of extraction method of xylan in hickory nut shell
  • A kind of extraction method of xylan in hickory nut shell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Put 4 g of pecan shell powder, 0.2 g of calcium carbonate and 0.2 g of talc into a ball mill, and mill at a speed of 400 rpm for 1 h; weigh 0.75 g of ball mill powder, add 30 mL of water to the obtained ball mill powder, and heat at 50 °C, Under the condition of 150 rpm, the shaking time was 1 h, centrifuged, the filtrate was collected, and freeze-dried to obtain xylan, its HPLC spectrum was as follows: figure 2 As shown, the peak time of its xylan is the same as figure 1 The peak elution time of the standard xylan shown is the same, according to the results of HPLC, combined with the yield of xylan and the calculation method of xylose content, the calculated yield is 9.7%, and the purity is 50.2%.

Embodiment 2

[0028] Put 4 g of hickory nut shells, 0.2 g of microcrystalline cellulose and 0.2 g of talc into a ball mill, and mill at a speed of 400 rpm for 2 h; weigh 0.75 g of ball-milled powder, add 30 mL of water to the obtained ball-milled powder, and heat at 50 °C 1. The shaking time was 1 h at a speed of 150 rpm, centrifuged, the filtrate was collected, and freeze-dried to obtain xylan with a yield of 11.9% and a purity of 48.2%.

Embodiment 3

[0030] Put 8 g of pecan shell powder, 0.4 g of calcium carbonate and 0.4 g of microcrystalline cellulose into a ball mill, and mill at a speed of 800 rpm for 2 h; weigh 0.5 g of ball mill powder, add 20 mL of water to the obtained ball mill powder, and Under the conditions of 150 rpm and 150 rpm, the shaking time was 1 h, centrifuged, the filtrate was collected, and freeze-dried to obtain xylan with a yield of 23.9% and a purity of 56.2%.

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Abstract

The invention discloses a method for extracting xylan from hickory shells. The method comprises the following steps: adding hickory shell powder and a solid phase reagent into a ball mill, grinding the hickory shell powder and the solid phase reagent to obtain ball-milled mixed powder, adding a limited volume of water to the powder, vibrating and centrifuging the obtained solution, collecting theobtained supernatant, and freeze-drying the supernatant to obtain the xylan. The hickory shell powder and the solid phase reagent are commonly ground and crushed under the action of high-energy mechanical force, and water is as the solvent in the extraction process, so the emission of a waste liquid is reduced, the obtained xylan has the advantages of high purity, remarkably improved content of xylose in monosaccharide compositions, good color and no decolorizing, the process flow is simplified, and the production cost is reduced. The method has the advantages of simplicity in operation, shortextraction time, mild extraction conditions, high efficiency, low energy consumption, environmental protection, and easiness in large-scale industrial production, is a method for preparing xylan fromhickory shells, having a good promotion and application prospect, and lays a foundation for the further development and utilization of the xylan in the hickory shells.

Description

technical field [0001] The invention belongs to the technical field of production and technical application of plant polysaccharides, and in particular relates to a method for extracting xylan from hickory nut shells. Background technique [0002] Hickory is a deciduous tree belonging to the genus Hickory in the family Juglandaceae. Its fruit has extremely high nutritional value and unique taste and flavor. The inner husk contains 38.05% lignin, 30.88% cellulose, and 27.26% hemicellulose, among which hemicellulose is an important raw material for the preparation of xylan. But until now, the research on hickory nut shells has mainly focused on small molecular compounds such as flavonoids and brown pigments, and less research on xylan, resulting in a great waste of resources. Xylan is an abundant biomass resource and the most abundant polysaccharide in nature besides cellulose. According to reports, xylan can be degraded into xylooligosaccharides, which have a wide range of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B37/14
CPCC08B37/0003C08B37/0057
Inventor 张琦红任威许文灏苏为科
Owner ZHEJIANG UNIV OF TECH
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