Authors: Suleeporn Kitcha Benjamas Cheirsilp
Publish Date: 2014/03/28
Volume: 173, Issue: 2, Pages: 522-534
Abstract
This study attempted to enhance biomass and lipid productivity of an oleaginous yeast Trichosporonoides spathulata by coculturing with microalgae Chlorella spp optimizing culture conditions and encapsulating them in alginate gel beads The coculture of the yeast with microalgae Chlorella vulgaris var vulgaris TISTR 8261 most enhanced overall biomass and lipid productivity by 16fold of the yeast pure culture at 48 h and by 11fold at 72 h After optimization and scaleup in a bioreactor this coculture produced the highest biomass of 122 g/L with a high lipid content of 47 The dissolved oxygen monitoring system in the bioreactor showed that the microalgae worked well as an oxygen supplier to the yeast This study also showed that the coencapsulated yeast and microalgae could grow and produce lipid as same as their free cells did Therefore it is possible to apply this encapsulation technique for lipid production and simplification of downstream harvesting process This coculture system also produced the lipid with high content of saturated fatty acids indicating its potential use as biodiesel feedstock with high oxidative stabilityThis research was financial supported by the Graduate School of Prince of Songkla University and the Higher Education Research Promotion and National Research University Project of Thailand Office of the Higher Education Commission The first author thanks to the Palm Oil Products and Technology Research Center POPTEC for supporting her scholarship Thanks also to Dr Brian Hodgson for his assistance with the English
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