Isolation of alkaliphilic bacteria for production of high optically pure L-(+)-lactic acid
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- Yokaryo Hiroto
- Okinawa Prefectural Industrial Technology Center
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- Tokiwa Yutaka
- Okinawa Prefectural Industrial Technology Center
抄録
Lactic acid bacteria that grow under alkaline conditions (pH 10) were isolated from various sources in Okinawa (Japan). These alkali-tolerant and alkaliphilic bacteria were classified as follows: Microbacterium sp. (1 strain), Enterococcus spp. (9 strains), Alkalibacterium spp. (3 strains), Exiguobacterium spp. (5 strains), Oceanobacillus spp. (3 strains) and Bacillus spp. (7 strains) by 16S rRNA gene sequencing. By fermentation, many strains were able to convert glucose into mainly L-(+)-lactic acid of high optical purity in alkaline broth. This result indicated that valuable L-(+)-lactic acid-producing bacteria could be isolated efficiently by screening under alkaline conditions. Six strains were selected and their ability to produce lactic acid at different initial pH was compared. Enterococcus casseliflavus strain 79w3 gave the highest lactic acid concentration. Lactic acid concentration and productivity were 103 g L−1 (optical purity of 99.5% as L-isomer) and 2.2 g L−1 h−1, respectively when 129 g L−1 of glucose was used by batch fermentation.
収録刊行物
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- The Journal of General and Applied Microbiology
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The Journal of General and Applied Microbiology 60 (6), 270-275, 2014
公益財団法人 応用微生物学・分子細胞生物学研究奨励会