Inalbon María Cristina, Mocchiutti Paulina, Zanuttini Miguel
Facultad de Ingeniería Química, Instituto de Tecnología Celulósica, Universidad Nacional del Litoral, Santiago del Estero, Santa Fe, Argentina.
Bioresour Technol. 2009 Apr;100(7):2254-8. doi: 10.1016/j.biortech.2008.10.054. Epub 2008 Dec 17.
The removal of native acetyl groups from hardwood O-acetyl-glucuronoxylan has a strong effect on physical characteristics, accessibility and structure of this polymer. The removal also has effects on the swelling and ion transport capacity of the cell wall of hardwoods. In this work, a kinetic expression for Eucalyptus wood deacetylation is determined. Two liquid mediums are considered: a simple alkaline one and another with a higher sodium concentration. The kinetic expression is a power law for the acetyl content and the concentrations in the liquid medium dependence, and is an Arrhenius type expression for temperature dependence. The kinetic expression can be useful to predict the physical properties of wood since the analysis of deacetylation effects on effective capillarity (ECCSA) shows that the acetyl content is a determining factor of wood ionic transport capacity.
从阔叶木O - 乙酰 - 葡糖醛酸木聚糖中去除天然乙酰基，对该聚合物的物理特性、可及性和结构有强烈影响。这种去除还对阔叶木细胞壁的膨胀和离子传输能力有影响。在这项工作中，确定了桉木脱乙酰化的动力学表达式。考虑了两种液体介质：一种简单的碱性介质和另一种具有较高钠浓度的介质。该动力学表达式是关于乙酰含量和液体介质中浓度依赖性的幂律，以及关于温度依赖性的阿伦尼乌斯型表达式。由于对有效毛细作用（ECCSA）的脱乙酰化效应分析表明乙酰含量是木材离子传输能力的决定性因素，所以该动力学表达式可用于预测木材的物理性质。
