Yeh Ting-Feng, Chang Mao-Ju, Chang Wan-Jung
School of Forestry and Resource Conservation, National Taiwan University , Number 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan.
J Agric Food Chem. 2014 Nov 5;62(44):10768-75. doi: 10.1021/jf504461c. Epub 2014 Oct 27.
Chemical components of lignocellulosic biomass may impede biofuel processing efficiency. To understand whether the heartwood of Acacia confusa is suitable for biofuel application, extractive-free heartwood of A. confusa was subjected to dilute acid (DA) or sulfite pretreatments. Sugar recoveries were used to evaluate the performance of different pretreatments. Cell wall properties, such as 4-O-alkylated lignin structures, S/G ratios, and xylan contents, of the pretreated samples showed significant correlations with the enzymatic saccharification of glucan. The 4% bisulfite-pretreated samples produced higher total sugar recoveries than DA-treated samples. The highest total sugar recoveries from DA and sulfite pretreatment were 52.0% (170 °C for 20 min) and 65.3% (4% NaHSO3 and 1% H2SO4), respectively. The results also demonstrated that the existence of extractives in the heartwood of A. confusa hindered the sugar recoveries from both the pretreatments and enzymatic saccharification. Total sugar recoveries were reduced 11.7-17.7% in heartwood samples with extractives.
木质纤维素生物质的化学成分可能会阻碍生物燃料的加工效率。为了解台湾相思树的心材是否适合用于生物燃料，对台湾相思树的无抽提物心材进行了稀酸（DA）或亚硫酸盐预处理。糖回收率用于评估不同预处理的性能。预处理样品的细胞壁特性，如4-O-烷基化木质素结构、S/G比和木聚糖含量，与葡聚糖的酶促糖化显示出显著相关性。4%亚硫酸氢盐预处理的样品比DA处理的样品产生更高的总糖回收率。DA和亚硫酸盐预处理的最高总糖回收率分别为52.0%（170℃，20分钟）和65.3%（4%NaHSO3和1%H2SO4）。结果还表明，台湾相思树心材中抽提物的存在阻碍了预处理和酶促糖化过程中的糖回收。有抽提物的心材样品的总糖回收率降低了11.7-17.7%。
