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Production of optically pure d-lactic acid from brown rice using metabolically engineered Lactobacillus plantarum

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Abstract

Simultaneous saccharification and fermentation (SSF) of d-lactic acid was performed using brown rice as both a substrate and a nutrient source. An engineered Lactobacillus plantarum NCIMB 8826 strain, in which the ʟ-lactate dehydrogenase gene was disrupted, produced 97.7 g/L d-lactic acid from 20% (w/v) brown rice without any nutrient supplementation. However, a significant amount of glucose remained unconsumed and the yield of lactic acid was as low as 0.75 (g/g-glucose contained in brown rice). Interestingly, the glucose consumption was significantly improved by adapting L. plantarum cells to the low-pH condition during the early stage of SSF (8–17 h). As a result, 117.1 g/L d-lactic acid was produced with a high yield of 0.93 and an optical purity of 99.6% after 144 h of fermentation. SSF experiments were repeatedly performed for ten times and d-lactic acid was stably produced using recycled cells (118.4–129.8 g/L). On average, d-lactic acid was produced with a volumetric productivity of 2.18 g/L/h over 48 h.

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Correspondence to Akihiko Kondo.

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Funding

This work was partly financed by the Strategic Foundational Technology Improvement Support Operation of the Kinki Bureau of Economy, Trade and Industry, Japan. We acknowledge Special Coordination Funds for Promoting Science and Technology, Creation of Innovative Centers for Advanced Interdisciplinary Research Areas (Innovative Bioproduction Kobe) from the Ministry of Education, Culture, Sports, Science and Technology, Japan. We also thank the Japan Society for the Promotion of Science (JSPS), KAKENHI Grant (16K18299).

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The authors declare that they have no conflict of interest.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Okano, K., Hama, S., Kihara, M. et al. Production of optically pure d-lactic acid from brown rice using metabolically engineered Lactobacillus plantarum . Appl Microbiol Biotechnol 101, 1869–1875 (2017). https://doi.org/10.1007/s00253-016-7976-8

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  • DOI: https://doi.org/10.1007/s00253-016-7976-8

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