Screening of Xylose-Utilizing Oleaginous Yeasts from Fermented Bio-extracts for Microbial Oil Production

Authors

  • Salinee Sriwongchai Natural Resources and Environment Program, Faculty of Science and Social Sciences, Burapha University Sakaeo Campus
  • Chanisa Aksornsamai
  • Rujirat Kitleartpornpairoat

Abstract

Biodiesel is a renewable alternative to petroleum-based diesel fuel and environment friendly energy which made from various vegetable oils, animal fats and waste cooking oils through transesterification. Nowadays, microbial oils from oleaginous microorganisms are recognized as promising alternative biodiesel feedstock, especially, oleaginous yeast oils. In this study, oleaginous xylose-utilizing yeasts which produce microbial oil were screened from fermented bio-extract samples. Nineteen differently morphological yeast isolates were isolated on YPD agar medium and twelve yeast isolates could grow and utilize xylose as carbon sources on xylose medium. Microbial oil production of xylose-utilizing yeasts was investigated on nitrogen-limiting medium containing 30.0 g/L of xylose as a sole carbon source; initial pH 5.5; temperature at 30◦C and orbital shaking at 150 rpm for 120 h.                It was found that the yeast isolate FBY3-3 accumulated the intracellular lipid about 23.21% by dry cell weight that called oleaginous yeast. The isolate FBY3-3 was identified as a Pichia kudriavzevii FBY3-3. The extracted oils of             P. kudriavzevii FBY3-3 predominantly contained long chain fatty acids such as palmitic acid (C16:0) and oleic acid (C18:1) that comparable to conventional vegetable oils. The results suggest that P. kudriavzevii FBY3-3 has a potential for microbial oil production and could be used as alternative biodiesel feedstock.          Keywords : oleaginous yeasts, xylose, microbial oils, screening

Author Biography

Salinee Sriwongchai, Natural Resources and Environment Program, Faculty of Science and Social Sciences, Burapha University Sakaeo Campus

   

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Published

2019-02-26