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首页> 外文期刊>RSC Advances >Co-production of solvents and organic acids in butanol fermentation by Clostridium acetobutylicum in the presence of lignin-derived phenolics
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Co-production of solvents and organic acids in butanol fermentation by Clostridium acetobutylicum in the presence of lignin-derived phenolics

机译：在木质素衍生的酚醛酸的存在下，乙醛酸丁醇发酵溶剂和有机酸的共同生产

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Co-production of solvents (butanol, acetone, and ethanol) and organic acids (butyrate and acetate) by Clostridium acetobutylicum using lignocellulosic biomass as a substrate could further enlarge the application scope of butanol fermentation. This is mainly because solvents and organic acids could be used for production of fine chemicals such as butyl butyrate, butyl oleate, etc. However, many phenolic fermentation inhibitors are formed during the pretreatment process because of lignin degradation. The present study investigated the effects of five typical lignin-derived phenolics on the biosynthesis of solvents and organic acids in C. acetobutylicum ATCC 824. Results obtained in 100?mL anaerobic bottles indicated that butanol concentration was enhanced from 10.29 g L ~(?1) to 11.36 g L ~(?1) by the addition of 0.1 g L ~(?1) vanillin. Subsequently, a pH-control strategy was proposed in a 5 L anaerobic fermenter to alleviate the “acid crash” phenomenon and improve butanol fermentation performance, simultaneously. Notably, organic acid concentration was enhanced from 6.38 g L ~(?1) (control) to a high level of 9.21–12.57 g L ~(?1) with vanillin or/and vanillic acid addition (0.2 g L ~(?1) ) under the pH-control strategy. Furthermore, the butyrate/butanol ratio reached the highest level of 0.80 g g ~(?1) with vanillin/vanillic acid co-addition, and solvent concentration reached 13.85 g L ~(?1) , a comparable level to the control (13.69 g L ~(?1) ). The effectiveness and robustness of the strategy for solvent and organic acid co-production was also verified under five typical phenolic environments. In conclusion, these results suggest that the proposed process strategy would potentially promote butanol fermentative products from renewable biomass.
机译：通过使用木质纤维素生物质作为基质的酸纤维菊属植物的梭菌乙酰丁基酸酸酸（丁醇，丙酮和乙醇）和有机酸（丁酸酯和乙酸盐）的共同可以进一步扩大丁醇发酵的应用范围。这主要是因为溶剂和有机酸可用于生产精细化学品如丁酸丁酯，丁酯等。然而，由于木质素降解，在预处理过程中形成了许多酚类发酵抑制剂。本研究研究了五种典型的木质素衍生酚类对C.乙酰丁基ATCC 824中溶剂和有机酸生物合成的影响。在100μlAnaerobic瓶中获得的结果表明，丁醇浓度从10.29g l〜（？1通过添加0.1g l〜（α1）香草蛋白，至11.36g l〜（α1）。随后，在5L厌氧发酵罐中提出了pH调控策略，以缓解“酸碰撞”现象，同时改善丁醇发酵性能。值得注意的是，通过6.38g l〜（α1）（对照）增强有机酸浓度（对照），通过香草蛋白或/和香草酸加入（0.2g l〜（α1）的高水平9.21-12.57g l〜（Δ1） ））在pH控制策略下。此外，用香草蛋白/香草酸的加入达到最高水平的0.80gg〜（α1），溶剂浓度达到13.85g l〜（α1），对照的可比水平（13.69g l〜（？1））。在五种典型的酚类环境下还验证了溶剂和有机酸共同策略的有效性和稳健性。总之，这些结果表明，拟议的过程策略可能会促进来自可再生生物质的丁醇发酵产物。

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