本研究用鹼水解及次臨界流體萃取的方式將台灣蔗渣成分分離。蔗渣的鹼水解係利用濃度0、1、2 或4 M 的氫氧化鈉溶液，在120 °C 下進行；而次臨界流體萃取則是控制反應溫度於120、140、160 或180 °C，並設定反應起始壓力於13 bar。本研究探討鹼水解及次臨界流體萃取對蔗渣溶解度的影響，並探討在兩種反應中不同條件下萃取出的酚酸（對香豆酸、阿魏酸、香草醛、丁香酸、甲糠醛、對羥基苯甲酸）及中性糖（木糖、葡萄糖、阿拉伯糖、半乳糖、甘露糖、鼠李糖、糖醛酸）之含量，以及過濾後剩下固態成分之化學組成（水份含量、元素分析），並利用傅立葉轉換紅外線光譜分析儀及核磁共振儀探討固態之結構。此外，本研究並使用熱重／熱示差分析儀做蔗渣經鹼水解及次臨界水萃取後固態成份的熱分析。

A set of experimental trials intended to fractionate Taiwanese sugarcane bagasse during alkaline and subcritical water treatments. The alkaline treatments of sugarcane bagasse were done at 120 °C using 0, 1, 2 and 4 M sodium hydroxide. While, the subcritical water treatments were done in a reactor at 120, 140, 160 and 180 °C and 13 bar. Following a study on the effects of both alkali and subcritical water treatments on the solublization rate of sugarcane bagasse is carried out. The soluble phenolic acids (p-coumaric acid, ferulic acid, vanillin, syringic acid, 5-hydroxymethyl-furfural, and p-hydroxybenzoic acid) and neutral sugar (d-xylose, d-glucose, l-arabinose, galactose, mannose, rhamnose and uronic acid) contents of different liquid fractions resulted from both alkali and subcritical treatment of the sugarcane bagasse were determined and discussed. Also, the chemical compositions (moisture content and elemental analysis) and structural elucidation (FT-IR, 1H-NMR, and 13C-NMR spectral data) of different solid fractions of alkali and subcritical treated bagasse are analyzed and explained. Moreover, thermal analysis of different solid fractions resulted from the alkaline and subcritical treatments of sugarcane bagasse were investigated using thermogravimetric analysis (TGA), and differential thermal analysis (DTA) techniques.

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