Tapping the bioactivity potential of residual stream from its pretreatments may be a green strategy for low-cost bioconversion of rice straw

Xingxuan CHEN, Xiahui WANG, Yiyun XUE, Tian-Ao ZHANG, Jiajun HU, Yiu Fai TSANG, Min-Tian GAO

Research output: Contribution to journalArticle

4 Citations (Scopus)

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. Copyright © 2018 The Author(s).
Original languageEnglish
Pages (from-to)507-524
JournalApplied Biochemistry and Biotechnology
Volume186
Issue number3
Early online dateApr 2018
DOIs
Publication statusPublished - Nov 2018

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Bioconversion
Straw
Bioactivity
Antioxidants
Anti-Infective Agents
Antimicrobial agents
Costs and Cost Analysis
Acids
Assays
Costs
Saccharification
Biofuels
Microorganisms
Glucose
Recovery
Growth
Oryza
Experiments

Citation

Chen, X., Wang, X., Xue, Y., Zhang, T.-A., Hu, J., Tsang, Y. F., & Gao, M.-T. (2018). Tapping the bioactivity potential of residual stream from its pretreatments may be a green strategy for low-cost bioconversion of rice straw. Applied Biochemistry and Biotechnology, 186(3), 507-524. doi: 10.1007/s12010-018-2751-1

Keywords

  • Rice straw
  • Antioxidant activity
  • Phenolic compounds
  • Pretreatment
  • Biorefinery