Detoxification of Jatropha curcas kernel cake by a novel Streptomyces fimicarius strain

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• 作者：Xing-Hong Wang ; Lingcheng Ou ; Liang-Liang Fu ; Shui Zheng ; Ji-Dong Lou ; Jos¨¦ Gomes-Laranjo ; Jiao Li ; Changhe Zhang
• 关键词：Jatropha curcas ; Biodiesel ; Kernel cake detoxification ; Solid state fermentation ; Streptomyces fimicarius YUCM 310038
• 刊名：Journal of Hazardous Materials
• 出版年：2013
• 出版时间：15 September, 2013
• 年：2013
• 卷：260
• 期：Complete
• 页码：238-246
• 全文大小：1653 K

文摘

A huge amount of kernel cake, which contains a variety of toxins including phorbol esters (tumor promoters), is projected to be generated yearly in the near future by the Jatropha biodiesel industry. We showed that the kernel cake strongly inhibited plant seed germination and root growth and was highly toxic to carp fingerlings, even though phorbol esters were undetectable by HPLC. Therefore it must be detoxified before disposal to the environment. A mathematic model was established to estimate the general toxicity of the kernel cake by determining the survival time of carp fingerling. A new strain (Streptomyces fimicarius YUCM 310038) capable of degrading the total toxicity by more than 97 % in a 9-day solid state fermentation was screened out from 578 strains including 198 known strains and 380 strains isolated from air and soil. The kernel cake fermented by YUCM 310038 was nontoxic to plants and carp fingerlings and significantly promoted tobacco plant growth, indicating its potential to transform the toxic kernel cake to bio-safe animal feed or organic fertilizer to remove the environmental concern and to reduce the cost of the Jatropha biodiesel industry. Microbial strain profile essential for the kernel cake detoxification was discussed.