The effect of volatile fatty acids as a sole carbon source on lipid accumulation by Cryptococcus albidus for biodiesel production |
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Authors: | Fei Qiang Chang Ho Nam Shang Longan Choi Jin-dal-rae Kim Nagjong Kang JongWon |
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Affiliation: | a Biochemical Engineering Lab, Department of Chemical and Bimolecular Engineering, KAIST, Daejeon 305-701, Republic of Korea b EewsBiotech, KAIST building N28-3105, KAIST, Daejeon 305-701, Republic of Korea c College of Biological and Chemical Engineering, Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, PR China |
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Abstract: | The use of volatile fatty acids (VFAs) for microbial lipid accumulation was investigated in flask cultures of Cryptococcus albidus. The optimum culture temperature and pH were 25 °C and pH 6.0, respectively, and the highest lipid content (27.8%) was obtained with ammonia chloride as a nitrogen source. The lipid yield coefficient on VFAs was 0.167 g/g of C. albidus with a VFAs (acetic, propionic, butyric acids) ratio of 8:1:1, which was in good agreement with a theoretically predicted lipid yield coefficient of the VFAs as a carbon source. The major fatty acids of the lipids accumulated by C. albidus were similar to those of soybean oil and jatropha oil. A preliminary cost analysis shows that VFAs-based biodiesel production is competitive with current palm and soybean based biodiesels. Further process development for lower aeration cost and higher lipid yield will make this process more economical. |
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Keywords: | Volatile fatty acids (VFAs) Microbial lipids Biodiesel Cryptococcus albidus Economic analysis |
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