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Exopolysaccharide from psychrotrophic Arctic glacier soil bacterium Flavobacterium sp. ASB 3-3 and its potential applications

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Title
Exopolysaccharide from psychrotrophic Arctic glacier soil bacterium Flavobacterium sp. ASB 3-3 and its potential applications
Authors
Sathiyanarayanan, Ganesan
Yi, Da-Hye
Bhatia, Shashi Kant
Kim, Jung-Ho
Seo, Hyung Min
Kim, Yun-Gon
Park, Sung-Hee
Jeong, Daham
Jung, Seunho
Jung, Ji Young
Lee, Yoo Kyung
Yang, Yung-Hun
Subject
Chemistry
Keywords
Exopolysaccharide; Flavobacterium; Arctic glacier soil
Issue Date
2015
Citation
Sathiyanarayanan, Ganesan., et al. 2015. Exopolysaccharide from psychrotrophic Arctic glacier soil bacterium Flavobacterium sp. ASB 3-3 and its potential applications, RSC ADVANCES, 5(103): 84492-84502.
Abstract
A novel exopolysaccharide (EPS) producing psychrotrophic bacterium Flavobacterium sp. ASB 3-3 was isolated from Arctic glacier soil and identified. The optimum fermentation conditions for EPS production were an initial medium pH of 7.2 and an initial inoculum size of 5% (v/v). The maximum yield of EPS (7.25 ± 0.26 g L-1) was obtained after cultivation at 25 °C for 120 h with glycerol as the sole carbon source. The EPS was purified and its structural characteristics were analyzed by 1H and 13C NMR. The predominant repeating units of this EPS are (α, β) D-glucose and D-galactose and it is different from the structure of EPSs produced by other Arctic and Antarctic bacteria, which have mannose units. In addition, EPS has demonstrated a comparable emulsifying property than SDS and flocculating properties with kaolinite, suggesting their potential applications in various industries. The EPS also significantly improved the tolerance of Flavobacterium sp. and Escherichia coli from freeze?thaw cycles, suggesting that it might be used to survive in polar regions and it can have possible usage as microbial cryoprotectants.
DOI
10.1039/C5RA14978A
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