Microalgal lipid production using the hydrolysates of rice straw pretreated with gamma irradiation and alkali solution
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- Microalgal lipid production using the hydrolysates of rice straw pretreated with gamma irradiation and alkali solution
- Joe, Min-Ho
Lee, Sung Gu
Han, Se Jong
- Biotechnology & Applied Microbiology; Energy & Fuels
- Rice straw; Pretreatment; Microalgae; Gamma ray irradiation; Lipid
- Issue Date
- Joe, Min-Ho., et al. 2015. Microalgal lipid production using the hydrolysates of rice straw pretreated with gamma irradiation and alkali solution. Biotechnol Biofuels. 8: 125
- Background: Lignocellulosic biomass has long been recognized as a potential sustainable source of sugars for biofuels. However, many physicochemical structural and compositional factors inhibit the enzymatic digestibility of
the lignocellulosic biomass. In this study, efficient pretreatment method of rice straw (RS) was developed and the RS hydrolysate was applied in the cultivation of microalgae for lipid production.
Results: Gamma ray irradiation (GRI) and alkali solution were used for the pretreatment, and saccharification was carried out with lignocellulolytic enzymes. When RS was pretreated by combined GRI and alkali method, the glucose and
xylose saccharification yield after enzymatic hydrolysis increased up to 91.65 and 98.84 %, respectively. The enzymatic hydrolysate from the RS pretreated with the combined method was used to cultivate Chlorella protothecoides for lipid
production. The maximum concentrations of biomass and fatty acid methyl ester of cells were 6.51 and 2.95 g/L, respectively. The lipid content of C. protothecoides from RS hydrolysate was comparable to that from glucose, and the
lipid composition was similar between different carbon sources.
Conclusion: These results demonstrate that the combined pretreatment with gamma irradiation was highly effective in preparing hydrolysate, and the rice straw hydrolysate could be used as an alternative carbon source for microalgal
lipid production for biofuel.
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