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A novel method to prepare L-arabinose from xylose mother liquor by yeast-mediated biopurification.

Abstract：

BACKGROUND:L-arabinose is an important intermediate for anti-virus drug synthesis and has also been used in food additives for diets-controlling in recent years. Commercial production of L-arabinose is a complex progress consisting of acid hydrolysis of gum arabic, followed by multiple procedures of purification, thus making high production cost. Therefore, there is a biotechnological and commercial interest in the development of new cost-effective and high-performance methods for obtaining high purity grade L-arabinose. RESULTS:An alternative, economical method for purifying L-arabinose from xylose mother liquor was developed in this study. After screening 306 yeast strains, a strain of Pichia anomala Y161 was selected as it could effectively metabolize other sugars but not L-arabinose. Fermentation in a medium containing xylose mother liquor permitted enrichment of L-arabinose by a significant depletion of other sugars. Biochemical analysis of this yeast strain confirmed that its poor capacity for utilizing L-arabinose was due to low activities of the enzymes required for the metabolism of this sugar. Response surface methodology was employed for optimization the fermentation conditions in shake flask cultures. The optimum conditions were: 75 h fermentation time, at 32.5°C, in a medium containing 21% (v/v) xylose mother liquor. Under these conditions, the highest purity of L-arabinose reached was 86.1% of total sugar, facilitating recovery of white crystalline L-arabinose from the fermentation medium by simple methods. CONCLUSION:Yeast-mediated biopurification provides a dynamic method to prepare high purity of L-arabinose from the feedstock solution xylose mother liquor, with cost-effective and high-performance properties.

journal_name

Microb Cell Fact

journal_title

Microbial cell factories

authors

Cheng H,Wang H,Lv J,Jiang M,Lin S,Deng Z

doi

10.1186/1475-2859-10-43

subject

Has Abstract

pub_date

2011-06-07 00:00:00

pages

43

issn

1475-2859

pii

1475-2859-10-43

journal_volume

10

pub_type

杂志文章

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