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 Epub Date: 2025-01-11 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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微波辅助四氢呋喃-水系统预处理水稻秸秆提高糖产量和平台化学品的生成

研究了微波（MW）辅助四氢呋喃-水（THF-H2O）预处理系统在低温低温下对水稻秸秆（RS）的处理效率。实验在不同的温度和时间范围内进行，以100℃和40 min为最佳预处理条件，总还原糖得率高（72.4%）。在常规加热条件下，总糖收率仅为21.3%。组成分析表明，与未处理的RS相比，MW预处理RS的纤维素含量有所提高，FTIR和XRD的结构表征表明，MW预处理RS的结晶度指数较低，LC-HRMS分析表明，MW-和tr预处理体系的水解液分别存在12（12）和8(8)个平台化学物质。重要的平台化学物质的存在和糖产量的提高标志着mw辅助THF-H2O系统在低温和低时间要求的生物炼制中使用的效率。

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