Efficient secretion of (R)-3-hydroxybutyric acid from Halomonas sp. KM-1 by nitrate fed-batch cultivation with glucose under microaerobic conditions.

Abstract:

:To establish a sustainable society, commodity chemicals need to be developed from biomass resources. Recently, (R)-3-hydroxybutyric acid ((R)-3-HB), a monomer of bioplastic poly-(R)-3-hydroxybutyric acid (PHB), has attracted attention for its possible use in the chemical industry. Halophilic bacteria have been considered for bioprocess applications due to certain characteristics such as the ability to grow in media containing high levels of the starting carbon source and the ability to be rarely contaminated. A halophilic bacterium Halomonas sp. KM-1 stores PHB intracellularly under aerobic conditions and secretes (R)-3-HB under microaerobic conditions. In this study, we optimized culture conditions to maximize (R)-3-HB secretion by KM-1 cells. By a simple nitrate fed-batch cultivation, Halomonas sp. KM-1 secreted 40.3g/L (R)-3-HB with a productivity of 0.48g L(-1)h(-1) with 20% (w/v) glucose. This level is one of the highest recorded productivity of (R)-3-HB to date.

journal_name

Bioresour Technol

journal_title

Bioresource technology

authors

Kawata Y,Ando H,Matsushita I,Tsubota J

doi

10.1016/j.biortech.2014.01.073

subject

Has Abstract

pub_date

2014-03-01 00:00:00

pages

400-3

eissn

0960-8524

issn

1873-2976

pii

S0960-8524(14)00098-4

journal_volume

156

pub_type

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