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Volume 39 Number 3 Volume 39 Number 4 Volume 39 Number 5

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Research articles

ScienceAsia 39(2013): 363-368 |doi: 10.2306/scienceasia1513-1874.2013.39.363


An aubasidan-like β-glucan produced by Aureobasidium pullulans in Thailand


Pongtharin Lotrakula,*, Pantakarn Unhapattaratitikula, Tosak Seelananb, Sehanat Prasongsuka, Hunsa Punnapayaka

 
ABSTRACT:     The nutrient assimilation profile of two non-pullulan-producing strains of Aureobasidium pullulans (NRRL 58539 and NRRL 58543) isolated in Thailand was investigated. Similar nutrient assimilation was observed between both strains and the pullulan-producing A. pullulans NRRL 58560. All three strains weakly assimilated methyl-α-D-glucoside and lactose. For the exopolysaccharide (EPS) production, NRRL 58539 and NRRL 58543 preferred NaNO3 as the sole nitrogen source. Enzyme sensitivity assays, infrared spectroscopy, and nuclear magnetic resonance analyses of the EPSs revealed a broad structural similarity to aubasidan and not to pullulan. This is the first report of an aubasidan-like β-glucan produced by A. pullulans in Thailand.

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a Plant Biomass Utilization Research Unit, Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok 10330 Thailand
b Plants of Thailand Research Unit, Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok 10330 Thailand

* Corresponding author, E-mail: pongtharin.l@chula.ac.th

Received 9 Oct 2012, Accepted 29 Mar 2013