Pretreatment of rice straw using a microwave-assisted tetrahydrofuran-water system for enhanced sugar yield and generation of platform chemicals

Q1 Environmental Science

Bioresource Technology Reports Pub Date : 2025-02-01 DOI:10.1016/j.biteb.2025.102026

Lakshana G. Nair, Pradeep Verma

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Abstract

The current study investigates the efficiency of a microwave (MW)-assisted Tetrahydrofuran-water (THF-H₂O) pretreatment system on rice straw (RS) at low temperatures and time ranges. Experiments were performed at different temperatures and time ranges, and 100 °C and 40 min were optimized as the best pretreatment conditions due to high total reducing sugar yields (72.4 %). Under conventional heating (TR), the same conditions resulted in only 21.3 % total sugar yield. Composition analysis reveals an improved cellulose content in the MW-pretreated RS compared to untreated RS. Structural characterization by FTIR and XRD indicates lower crystallinity indices of the MW-pretreated RS. LC-HRMS analyses of the hydrolysate of MW- and TR-pretreated systems revealed the presence of twelve (12) and eight (8) platform chemicals, respectively. The presence of important platform chemicals and enhanced sugar yields marks the efficiency of the MW-assisted THF-H₂O system for use in biorefineries with low temperature and time requirements.

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