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Chemical analysis of exopolysaccharide fractions and lipid compounds of the microalga Heterosigma akashiwo grown in vitro by Daniella Cristine Lopes; Juliana Bello Baron Maurer; Fabíola Regina Stevan-Hancke; Luis Antônio de Oliveira Proença; Selma Faria Zawadzki-Baggio is a Earth and Planetary Sciences article available to read on EtoBox.
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## Abstract We report on (i) __in vitro__ growth conditions for different growth stages of __Heterosigma akashiwo__ and (ii) isolation, purification and structural investigation of the exopolysaccharide fraction (EXO). Cell polysaccharide fractions were analyzed for chemical composition, and we performed a comparison of the lipid components between cultures subjected to either a light/dark cycle of 12 h/12 h or 24 h of light. Man, Rha and Gal were the main monosaccharides in the EXO fraction. Following the purification step, the EXO fraction yielded EXO1.0 and EXO1.5 fractions. A linkage analysis of the EXO1.0 fraction indicated the presence of a highly branched polysaccharide with a (1→4)-linked mannan backbone, and analysis of EXO1.5 indicated the presence of a complex rhamnan consisting mainly of 2- and 4-linked Rha units with the non-reducing end of Gal and Rha. In cultures subjected to a 12 h/12 h light/dark cycle, palmitic and myristic acids were the most abundant lipids, and no polyunsaturated acid was detected. However, in cultures subjected to 24 h of light, no myristic acid was detected, and stearic and palmitic acids were the most abundant fatty acids. A polyunsaturated
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- Author
- Daniella Cristine Lopes; Juliana Bello Baron Maurer; Fabíola Regina Stevan-Hancke; Luis Antônio de Oliveira Proença; Selma Faria Zawadzki-Baggio
- Publisher
- Walter de Gruyter GmbH
- Published
- 2012
- Language
- EN
- Field
- Earth and Planetary Sciences (Physical Sciences)