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Bioelectrochemical Detoxification of Phenolic Compounds during Enzymatic Pre-Treatment of Rice Straw
( Sanath Kondaveeti ),( Raviteja Pagolu ),( Sanjay K. S. Patel ),( Ashok Kumar ),( Aarti Bisht ),( Devashish Das ),( Vipin Chandra Kalia ),( In-won Kim ),( Jung-kul Lee ) 한국미생물 · 생명공학회 2019 Journal of microbiology and biotechnology Vol.29 No.11
The use of lignocellulosic biomass such as rice straw can help subsidize the cost of producing value-added chemicals. However, inhibitory compounds, such as phenolics, produced during the pre-treatment of biomass, hamper the saccharification process. Laccase and electrochemical stimuli are both well known to reduce phenolic compounds. Therefore, in this study, we implemented a bioelectrochemical detoxification system (BEDS), a consolidated electrochemical and enzymatic process involving laccase, to enhance the detoxification of phenolics, and thus achieve a higher saccharification efficiency. Saccharification of pretreated rice straw using BEDS at 1.5 V showed 90% phenolic reduction (Ph<sub>r</sub>), thereby resulting in a maximum saccharification yield of 85%. In addition, the specific power consumption when using BEDS (2.2 W/Kg Ph<sub>r</sub>) was noted to be 24% lower than by the electrochemical process alone (2.89 W/kg Ph<sub>r</sub>). To the best of our knowledge, this is the first study to implement BEDS for reduction of phenolic compounds in pretreated biomass.