Possibility of Soil Mangrove-Derived Oleaginous Yeast Rhodotorula mucilaginosa on Nutritionally Optimized Medium for Lipid Production for Alternative Biodiesel Feedstock

Authors

  • Salinee Sriwongchai
  • Sripanya Prasongsuk
  • Noppichai Leerat
  • Rujirat Kitleartpornpairoat

Abstract

Lipid-derived from oleaginous yeast is now being considered as promising for biodiesel feedstock. In this study, oleaginous yeasts were screened and isolated from soil mangrove samples collected in the eastern region of Thailand. A total of fifty one isolates were obtained, and preliminarily examined as potential lipid producer by cultivating in a nitrogen-limiting medium containing 50 g/L of glucose as a sole carbon source. Only twenty three isolates were observed the accumulation of intracellular lipid granule. It was found that the yeast strain SMY40 accumulated the highest lipid content 29.44% of their dry biomass weight, which was defined as oleaginous yeast and identified to be a Rhodotorula mucilaginosa. Optimization of nutritional parameters and culture condition were carried out to improved biomass and lipid production of R. mucilaginosa SMY40.Under the optimal condition; 1.67 g/L YNB w/o aa-AS with initial pH of 4.7 containing 70 g/L glucose and 10.0 g/L urea, incubation temperature at 30°C, orbital shaking speed at 150 rpm for 120 h of cultivation time, 4.40 g/L of dry biomass, 1.76 g/L of cellular lipid accumulation and up to 40.00%of accumulated lipid of total dry biomass weight were produced. The produced lipid composition from R. mucilaginosa SMY40 contained the high proportion of C16 and C18 fatty acids. The extracted lipids were mainly 20.21% palmitic acid (C16:0), 2.40% palmitoleic acid (C16:1), 5.85% stearic acid (C18:0), 51.64% oleic acid (C18:1) and 12.17% linoleic acid (C18:2) thatiscomparable to conventional vegetable oils. The results suggest that the extracted lipids of R. mucilaginosa SMY40 could be used as feedstock for biodiesel production.Keywords: Rhodotorula mucilaginosa, oleaginous yeast, soil mangrove, extracted lipid, biodiesel feedstock

Author Biography

Sripanya Prasongsuk

 

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Published

2018-02-08