Tapping the Bioactivity Potential of Residual Stream from Its Pretreatments May Be a Green Strategy for Low-Cost Bioconversion of Rice Straw |
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Authors: | Xingxuan Chen Xiahui Wang Yiyun Xue Tian-Ao Zhang Jiajun Hu Yiu Fai Tsang Min-Tian Gao |
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Affiliation: | 1.Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences,Shanghai University,Shanghai,China;2.Department of Architecture, Shanghai Academy of Fine Arts,Shanghai University,Shanghai,China;3.Department of Science and Environmental Studies,The Education University of Hong Kong,Ting Kok,Hong Kong, China |
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Abstract: | In this study, it was found that the residual stream from pretreatments of rice straw exhibited high antioxidant activity. Assays based on the Folin–Ciocalteu colorimetric method confirmed that the residual stream contained large amounts of phenolic compounds. Three antioxidant assays were employed to evaluate the bioactivity of the residual stream. Strong linear correlations existed among the release of phenolic compounds, saccharification efficiency, and antioxidant activity. The alkaline pretreatment provided a much greater release of phenolic compounds, especially phenolic acids, compared to the acid pretreatment, and consequently, it had stronger linear correlations than the acid pretreatment. Antibacterial experiments demonstrated the ability of the phenolic compounds in the residual stream to inhibit the growth of microorganisms, indicating the potential of these compounds as antimicrobial agents. To discuss the possibility of the co-production of antimicrobial agents and biofuels/biochemicals, both acid and alkaline pretreatments were optimized using response surface methodology. Under the optimal conditions, 285.7 g glucose could be produced from 1 kg rice straw with the co-production of 3.84 g FA and 6.98 g p-CA after alkaline pretreatment. These results show that the recovery of phenolic compounds from the residual stream could be a green strategy for the low-cost bioconversion of rice straw. |
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