Abstract
Lignocellulosic biomass is currently considered as one of the promising feedstock for petroleum diesel alternative, together with single cell oils. Rice bran, which is a very abundant waste especially in Asia, could be utilized better than just as cattle feed. Dilute acid hydrolysis using 3 % H2SO4 at 90 °C was found to be able to maximize the sugar produced from raw rice bran without prior oil extraction (TRS = 54.91 g/L). Activated carbon was used for removing most furan inhibitors from rice bran hydrolysate (RBH) after hydrolysis and resulted in a TRS of 50.10 g/L. RBH was then neutralized using calcium hydroxide and diluted to a TRS concentration of 30 g/L. RBH was used to culture Yarrowia lipolytica PO1g, resulting in a comparable results of lipid content to that cultured in complex medium (YPD). The highest crude lipid content obtained from Y. lipolytica cultivated in RBH with addition of 10 g/L yeast extract was 23.94 % (biomass = 14.3 g/L), while the optimum result obtained using YPD was at a C/N ratio of 9.5 (biomass reached 14.7 g/L) and crude lipid content was 28.42 %. Furthermore, lipid and γ-oryzanol can be recovered after dilute acid hydrolysis.
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Abbreviations
- BF3 :
-
Boron trifluoride
- FA:
-
Fatty acids
- FFA:
-
Free fatty acids
- C/N:
-
Carbon to nitrogen
- YPD:
-
Yeast extract-peptone-dextrose
- RB:
-
Rice bran
- DRB:
-
Defatted rice bran
- URBH:
-
Unsieved rice bran hydrolysate
- SRBH:
-
Sieved rice bran hydrolysate
- UDRBH:
-
Unsieved defatted rice bran hydrolysate
- HMF:
-
Hydroxymethylfurfural
- HPLC:
-
High performance liquid chromatography
- TRS:
-
Total reducing sugars
- HTGC:
-
High Temperature Gas Chromatography
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This work was supported by Ministry of Science and Technology (MOST 103-2221-E-011-148).
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Sutanto, S., Go, A.W., Chen, KH. et al. Maximized Utilization of Raw Rice Bran in Microbial Oils Production and Recovery of Active Compounds: A proof of concept. Waste Biomass Valor 8, 1067–1080 (2017). https://doi.org/10.1007/s12649-016-9685-z
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DOI: https://doi.org/10.1007/s12649-016-9685-z