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首页> 外文期刊>Bioprocess and Biosystems Engineering >Improvement of radio frequency (RF) heating-assisted alkaline pretreatment on four categories of lignocellulosic biomass
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Improvement of radio frequency (RF) heating-assisted alkaline pretreatment on four categories of lignocellulosic biomass

机译：对四类木质纤维素生物质进行射频（RF）加热辅助碱性预处理的改进

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Pretreatment plays an important role in making the cellulose accessible for enzyme hydrolysis and subsequent conversion because it destroys more or less resistance and recalcitrance of biomass. Radio frequency (RF)-assisted dielectric heating was utilized in the alkaline pretreatment on agricultural residues (corn stover), herbaceous crops (switchgrass), hardwood (sweetgum) and softwood (loblolly pine). Pretreatment was performed at 90 A degrees C with either RF or traditional water bath (WB) heating for 1 h after overnight soaking in NaOH solution (0.2 g NaOH/g Biomass). Pretreated materials were characterized by chemical compositional analysis, enzyme hydrolysis, scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The glucan yields of RF-heated four categories of hydrolysates were 89.6, 72.6, 21.7, and 9.9 %. Interestingly, RF heating raised glucan yield on switchgrass and sweetgum but not on corn stover or loblolly pine. The SEM images and FTIR spectra agreed with results of composition analysis and hydrolysis. GC-MS detected some compounds only from RF-heated switchgrass. These compounds were found by other researchers only in high-temperature (150-600 A degrees C) and high-pressure pyrolysis processes.
机译：预处理在使纤维素可用于酶水解和后续转化中起着重要作用，因为它或多或少地破坏了生物质的抗性和顽固性。射频（RF）辅助介电加热用于对农业残留物（玉米秸秆），草本作物（柳枝switch），硬木（甜木）和软木（活叶松）进行碱性预处理。在NaOH溶液（0.2 g NaOH / g生物质）中浸泡过夜后，在90 A摄氏度下用RF或传统水浴（WB）加热进行1 h预处理。通过化学成分分析，酶水解，扫描电子显微镜（SEM）和傅里叶变换红外光谱（FTIR）对预处理的材料进行表征。 RF加热的四类水解产物的葡聚糖产率分别为89.6％，72.6％，21.7％和9.9％。有趣的是，RF加热提高了柳枝and和甘蔗的葡聚糖产量，但没有增加玉米秸秆或火炬松的葡聚糖产量。 SEM图像和FTIR光谱与组成分析和水解的结果一致。 GC-MS仅从RF加热的柳枝detected中检测到一些化合物。其他研究人员仅在高温（150-600 A摄氏度）和高压热解过程中发现这些化合物。

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