4.8 Article

L-lactic acid production from starch by simultaneous saccharification and fermentation in a genetically engineered Aspergillus oryzae pure culture

Journal

BIORESOURCE TECHNOLOGY
Volume 173, Issue -, Pages 376-383

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.09.094

Keywords

Aspergillus oryzae; L-lactic acid; Starch; Lactate dehydrogenase

Funding

  1. Special Coordination Funds for Promoting Science and Technology
  2. Creation of Innovation Centers for Advanced Interdisciplinary Research Areas (Innovative Bioproduction Kobe) from Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan

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Lactic acid is a commodity chemical that can be produced biologically. Lactic acid-producing Aspergillus oryzae strains were constructed by genetic engineering. The A. oryzae LDH strain with the bovine L-lactate dehydrogenase gene produced 38 g/L of lactate from 100 g/L of glucose. Disruption of the wild-type lactate dehydrogenase gene in A. oryzae LDH improved lactate production. The resulting strain A. oryzae LDHD871 produced 49 g/L of lactate from 100 g/L of glucose. Because A. oryzae strains innately secrete amylases, A. oryzae LDHD871 produced approximately 30 g/L of lactate from various starches, dextrin, or maltose (all at 100 g/L). To our knowledge, this is the first report describing the simultaneous saccharification and fermentation of lactate from starch using a pure culture of transgenic A. oryzae. Our results indicate that A. oryzae could be a promising host for the bioproduction of useful compounds such as lactic acid. (C) 2014 Elsevier Ltd. All rights reserved.

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