Abstract
Supercritical methanolysis (SCM) of pretreated wheat straw (WS) with the white-rot fungus Trichoderma sp. AH was investigated. Structural change of pretreated WS was examined by Fourier transform infrared spectrometric analysis and chemical analysis as well as observation with a scanning electron microscope. The optimal pretreatment (PT) time of WS was 5 days of incubation, obtaining the maximum methanol-soluble portion (MSP) yield of 38.3% at 260 °C, compared with MSP yield of 24.6% of raw WS. According to the detailed compositional analysis of MSPs from SCM of raw and pretreated WS, after 5 days of incubation, PT with Trichoderma sp. AH enhanced conversion, specificity and content of esters significantly. Especially, the relative contents of methyl palmitate, methyl (9Z,12Z)-octadeca-9,12-dienoate, and methyl (E)-octadec-11-enoate in MSPs were increased dramatically. Therefore, the study brings out the potential of PT with Trichoderma sp. AH for facilitating conversion and specificity of biomass in liquefaction.
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