Journal of Analytical and Applied Pyrolysis ( IF 6 ) Pub Date : 2018-04-07 Maris Lauberts, Liga Lauberte, Alexandr Arshanitsa, Tatiana Dizhbite, Galina Dobele, Oskars Bikovens, Galina Telysheva
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量成分的结构转化，重点是获得可提取的有价值的化学物质
使用Py-GC / MS-FID，FTIR，GC-FID对微波（MW）辅助焙烧在不同温度（150-300°C）下引发的麦草和白杨木材化学结构的改性进行了比较研究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。建立了由于生物质干馏而形成的可提取化学物质的方法。在250-280°C的温度下，焙干后两种生物质的亲水性可萃取化学物质的形成增加最为明显。提取物的抗氧化活性通过自由基DPPH的测试进行评估
。两种烘焙生物质的提取物的UPLC-ESI-MS / MS分析表明，存在木质素-碳水化合物复合物片段。据检测，类黄酮单体曲霉素及其衍生物是小麦秸秆亲水性提取物中的主要化合物。研究结果为有价值的木质纤维素破坏产品的价值评估提供了有用的信息，这些产品可以从烘焙过的木材和谷物生物质中提取。
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