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Extraction of hemicellulosic materials

A technology of hemicellulose and cellulose, applied in the field of extraction of hemicellulose raw materials, can solve the problem of uncommon extraction

Inactive Publication Date: 2001-08-22
CAMBRIDGE BIOPOLYMERS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] However, aqueous extraction is only suitable for the lesser classes of gelling hemicelluloses (so this extraction is not universal)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Six extraction pots containing 400 ml of 0.025M sodium acetate buffer (pH 5.0) containing 1% v / v hydrogen peroxide were stirred (200 rpm) at 25°C. To each jar, 8g of corn bran (2% w / v) was added and dispersed over a period of 15 minutes. Potassium hydroxide was then added to raise the pH to 11.5 (approximately 4.2 g per can). Extract at 1, 2.5, 5, 7, 18 and 24 hour intervals.

[0083] Extracted extracts were adjusted to pH 7.0 with acetic acid, filtered to remove bran and refrigerated overnight at 4°C. The dextran precipitate formed overnight was removed by centrifugation. The pH was then adjusted to 5.5 with glacial acetic acid and 1.5 volumes of 99% IMS were added. The pH was then readjusted to 5.0. The precipitate was stirred for 30 minutes and then left at RTP for 1 hour. The supernatant was removed and the precipitate (grinded) was washed 3 times with IMS and dried quickly in a rotary evaporator under vacuum at 50°C.

[0084] The clarity of the recovered AXF / ...

Embodiment 2

[0086] Extracts were prepared as described in Example 1 except that extractions were performed at 2, 3, 4, 5, 6 and 7 hours. Yield increased with extraction time from about 4% w / r / t bran (at 2 hours) to about 11% (at 7 hours).

[0087] The extract is oxidatively gelled. The extract obtained after 2 hours produced a very brittle gel, while the extracts from 6 and 7 hours thickened (but did not gel).

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Abstract

Hemicelluloses may be extracted by alkaline peroxide treatment without removal of ferulate residues. Hemicelluloses prepared in this way retain their ability to gel. Such gelling hemicelluloses may be extracted with a number of different oxidizing species including hydrogen peroxide anion, hydrogen peroxide radical, hydroxyl radical, superoxide radical and oxide radical. A process has thus been developed for producing a hemicellulose gel that may be carried out at cold temperatures, thus facilitating enzymic co-processing, and that is high yielding and produces a gel that is light in color.

Description

field of invention [0001] The present invention relates to a process for the production of hemicellulose gels which have various industrial uses, including the food and pharmaceutical industries, as well as various agricultural uses. Background of the invention [0002] Plant tissue is composed of several different components, including cellulose, hemicellulose, β-glucan, starch, protein, phenolic acids, lignin, waxes, cutin, and suberin. The invention particularly relates to the extraction and processing of hemicellulose. [0003] The term "hemicellulose" is a term used in the art to encompass non-cellulosic, non-starchy plant polysaccharides. Thus, the term includes pentosans, pectins and gums. Some hemicelluloses, including arabinoxylans and pectins, are suitable as substrates for oxidative gelation ("gelling hemicelluloses"): such hemicelluloses often have phenolic group substituents, which Can be cross-linked with certain oxidizing agents. [0004] Arabinoxylans and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/00C12P19/04
CPCC08B37/0045C12P19/04C08B37/0018
Inventor S・J・罗林
Owner CAMBRIDGE BIOPOLYMERS LTD
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