Electrochemical detoxification of phenolic compounds in lignocellulosic hydrolysate for butyric acid and butanol production
- Electrochemical detoxification of phenolic compounds in lignocellulosic hydrolysate for butyric acid and butanol production
- 이경민; 민경선; 우한민; 한성옥; 엄영순
- Detoxification; Lignocellulosic hydrolysates; Electrochemical method
- Issue Date
- WCCE9 & APCChE2013
- Due to climate change and depletion of fossil fuels, research interest has been focused on production of fuels and chemicals from lignocellulose because it is the most abundant renewable resource and does not compete with food chain. For obtaining fermentable sugars, lignocellulose is usually hydrolyzed by diluted acid, but phenolics generated during the hydrolysis often inhibit microbial fermentation. Herein, we developed an electrochemical method for the removal of phenolics in lignocellulosic hydrolyates to reduce inhibitory effects on fermentation. Phenolics such as p-coumaric acid, ferulic acid, vanillin, and syringaldehyde were used as model compounds. The oxidation potential of each compound was determined using cyclic voltammetry and then the removal of phenolics was examined through electrical oxidation. The removal efficiency of p-coumaric acid, ferulic acid, vanillin, and syringaldehyde was 78, 77, 82, and 95 %, respectively, when 0.5 g/L of each compound was used. The detoxified medium remarkably improved the growth and metabolite production of Clostridum tyrobutyricum (a butyric acid-producing microbe) and Clostridium beijerinckii (a butanol-producing microbe) to the level of the control. The electrochemical system was then employed to treat rice straw hydrolysate and the treated hydrolysate was used to grow C. tyrobutyricum and C. beijerinckii. As a result, butyric acid and butanol production using the treated hydrolysate were about 95 % and 85 % of those with a conventional clostridia medium, respectively, whereas there was little production of metabolites without treatment, suggesting that the electrochemical method can be a promising technology for detoxification of lignocellulosic hydrolysates.
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