Enhanced L-(+)-lactic acid production by an adapted strain of Rhizopus oryzae using corncob hydrolysate

Dongmei Bai, S.Z. Li, Z.L. Liu, Z.F. Cui

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Corncob is an economic feedstock and more than 20 million tons of corncobs are produced annually in China. Abundant xylose can be potentially converted from the large amount of hemicellulosic materials in corncobs, which makes the crop residue an attractive alternative substrate for a value-added production of a variety of bioproducts. Lactic acid can be used as a precursor for poly-lactic acid production. Although current industrial lactic acid is produced by lactic acid bacteria using enriched medium, production by Rhizopus oryzae is preferred due to its exclusive formation of the-isomer and a simple nutrition requirement by the fungus. Production of-L-(+)-lactic acid by R. oryzae using xylose has been reported; however, its yield and conversion rate are poor compared with that of using glucose. In this study, we report an adapted R. oryzae strain HZS6 that significantly improved efficiency of substrate utilization and enhanced production of L-(+)-lactic acid from corncob hydrolysate. It increased L-(+)-lactic acid final concentration, yield, and volumetric productivity more than twofold compared with its parental strain. The optimized growth and fermentation conditions for Strain HZS6 were defined.
    Original languageEnglish
    JournalApplied Biochemistry and Biotechnology
    Volume144
    Issue number1
    Pages (from-to)79-85
    ISSN0273-2289
    DOIs
    Publication statusPublished - 2008

    Keywords

    • xylose utilization
    • fermentation
    • lignocellulosic feedstocks
    • adaptation

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