Electrochemical detoxification of phenolic compounds in lignocellulosic hydrolysate for Clostridium fermentation
- Electrochemical detoxification of phenolic compounds in lignocellulosic hydrolysate for Clostridium fermentation
- 이경민; 민경선; 최옥경; 김기연; 우한민; 김연제; 한성옥; 엄영순
- Electrochemical detoxification; Phenolic compounds; Clostridium fermentation; Lignocellulosic hydrolysate
- Issue Date
- Bioresource technology
- VOL 187, 228-234
- Lignocellulosic biomass is being preferred as a feedstock in the biorefinery, but lignocellulosic hydrolysate usually contains inhibitors against microbial fermentation. Among these inhibitors, phenolics are highly toxic to butyric acid-producing and butanol-producing Clostridium even at a low concentration. Herein, we developed an electrochemical polymerization method to detoxify phenolic compounds in lignocellulosic hydrolysate for efficient Clostridium fermentation. After the electrochemical detoxification for 10 h, 78%, 77%, 82%, and 94% of p-coumaric acid, ferulic acid, vanillin, and syringaldehyde were removed, respectively. Furthermore, 71% of total phenolics in rice straw hydrolysate were removed without any sugar-loss. Whereas the cell growth and metabolite production of Clostridium tyrobutyricum and Clostridium beijerinckii were completely inhibited in un-detoxified hydrolysate, those in detoxifying rice straw hydrolysate were recovered to 70–100% of the control cultures. The electrochemical detoxification method described herein provides an efficient strategy for producing butanol and butyric acid through Clostridium fermentation with lignocellulosic hydrolysate.
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