Abstract A comparative study of the modification of chemical structure of wheat straw and aspen wood initiated by microwave (MW) assisted torrefaction at different temperatures (150–300 °C) was carried out using Py-GC/MS-FID, FTIR, GC-FID and wet chemistry procedures as the main analytical tools. Differences in wood and wheat straw thermal transformations in the course of MW assisted torrefaction were revealed. Formation of extractable chemicals as the result of biomasses torrefaction was established. The most significant increase in formation of hydrophilic extractable chemicals was found for the both biomasses after torrefaction in the range of 250–280 °C. Antioxidant activity of extracts was assessed by the test with a free radical DPPH . The UPLC-ESI–MS/MS analysis of extracts from the both torrefied biomasses showed the presence of lignin-carbohydrate complex fragments. It was detected that a flavonoid monomer tricin and its derivatives were the dominant compounds in hydrophilic extracts from wheat straw. The results of the study provide useful information for valorization of potentially valuable lignocellulosic destruction products, which can be extracted from torrefied wood and cereal biomass.

中文翻译：

---

微波辅助烘焙引起的木材和谷物生物质成分的结构转变，重点是获得可提取价值的化学品

摘要 使用 Py-GC/MS-FID、FTIR、GC-在不同温度（150-300°C）下微波辅助烘焙对小麦秸秆和白杨木化学结构的改性进行了比较研究。 FID 和湿化学程序作为主要分析工具。揭示了 MW 辅助烘焙过程中木材和小麦秸秆热转化的差异。确定了由于生物质烘焙而形成的可提取化学品。在 250–280 °C 的范围内烘焙后，两种生物质的亲水性可提取化学品的形成增加最显着。提取物的抗氧化活性通过自由基 DPPH 的测试来评估。UPLC-ESI-MS/MS 对来自两种烘焙生物质的提取物的分析表明存在木质素-碳水化合物复合碎片。经检测，小麦秸秆亲水提取物中的主要化合物是黄酮类单体三辛酸及其衍生物。该研究的结果为有价值的木质纤维素破坏产品的估值提供了有用的信息，这些产品可以从烘焙木材和谷物生物质中提取。