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Title of Journal: Appl Biochem Biotechnol

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Abbravation: Applied Biochemistry and Biotechnology

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Springer US

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DOI

10.1006/snmr.2002.0075

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1559-0291

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Production and Properties of Two Novel Exopolysacc

Authors: Nadja Radchenkova Spasen Vassilev Ivan Panchev Gianluca Anzelmo Iva Tomova Barbara Nicolaus Margarita Kuncheva Kaloyan Petrov Margarita Kambourova
Publish Date: 2013/06/30
Volume: 171, Issue: 1, Pages: 31-43
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Abstract

Synthesis of innovative exocellular polysaccharides EPSs was reported for few thermophilic microorganisms as one of the mechanisms for surviving at high temperature Thermophilic aerobic sporeforming bacteria able to produce exopolysaccharides were isolated from hydrothermal springs in Bulgaria They were referred to four species such as Aeribacillus pallidus Geobacillus toebii Brevibacillus thermoruber and Anoxybacillus kestanbolensis The highest production was established for the strain 418 whose phylogenetic and phenotypic properties referred it to the species A pallidus Maltose and NH4Cl were observed to be correspondingly the best carbon and nitrogen sources and production yield was increased more than twofold in the process of culture condition optimization After purification of the polymer fraction a presence of two different EPSs electroneutral EPS 1 and negatively charged EPS 2 in a relative weight ratio 322 was established They were heteropolysaccharides consisting of unusual high variety of sugars six for EPS 1 and seven for EPS 2 Six of the sugars were common for both EPSs The main sugar in EPS 1 was mannose 693  smaller quantities of glucose 112 galactosamine 63  glucosamine 54  galactose 47 and ribose 29  were also identified The main sugar in EPS 2 was also mannose 339  followed by galactose 179  glucose 155  galactosamine 117  glucosamine 81  ribose 53  and arabinose 49  Both polymers showed high molecular weight and high thermostability

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