Exopolysaccharide (pullulan) production from sugarcane bagasse hydrolysate aiming to favor the development of biorefineries

Exopolysaccharide (pullulan) production from sugarcane bagasse hydrolysate aiming to favor the development of biorefineries

Pullulan is a biopolymer used in food industry produced by Aureobasidium pullulans from starch. In the present work, sugarcane bagasse (SCB) hydrolysate was evaluated as an alternative substrate in fermentation process assisted by blue LED lights. The best fermentation conditions in Erlenmeyer flask...

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Bibliographic Details
Published in:International journal of biological macromolecules Vol. 127; pp. 169 - 177
Main Authors: Terán Hilares, R., Resende, J., Orsi, C.A., Ahmed, M.A., Lacerda, T.M., da Silva, S.S., Santos, J.C.
Format: Journal Article
Language:English
Published: Netherlands Elsevier B.V 15-04-2019
Subjects:
Biorefinery
Pullulan
Sugarcane bagasse
Pullulan
Biorefinery
Sugarcane bagasse
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Summary:Pullulan is a biopolymer used in food industry produced by Aureobasidium pullulans from starch. In the present work, sugarcane bagasse (SCB) hydrolysate was evaluated as an alternative substrate in fermentation process assisted by blue LED lights. The best fermentation conditions in Erlenmeyer flasks were 25.3 °C, stirring speed of 232 rpm and yeast extract concentration of 1.88 g/L, yielding 25.19 g/L of pullulan, that corresponded to yield of 0.48 g/g and 0.28 g/(L·h) of volumetric productivity. By using a column bubble photobioreactor, similar yield values were obtained. Thermal properties of the produced pullulan as glass transition (Tg) and melting (Tm) temperatures were 38 °C and 160 °C, respectively, which were similar to the corresponding values of commercial food grade pullulan. Therefore, SCB hydrolysate is a promising substrate to produce good quality pullulan (86% of purity) with application in food industry, besides to represent a new alternative for biorefineries. [Display omitted] •Sugarcane bagasse hydrolysate is a potential substrate for pullulan production.•Sugars present in the hydrolysate are converted to pullulan by yeast-like fungus.•Bubble column reactor showed a good performance for pullulan production.•Properties of pullulan from SCB are comparable to commercial food grade pullulan.•Pullulan production is a promising alternative in a biorefinery context.
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ISSN:0141-8130
1879-0003
DOI:10.1016/j.ijbiomac.2019.01.038