半纤维素降解产物糖醛酸的测定方法研究进展

Research Progress in the Determination of Uronic Acid of Hemicellulose Degradation Product

关键词:  半纤维素  4-O-甲基葡萄糖醛酸  己烯糖醛酸

Key Words:hemicelluose  4-O-methylglucuronic acid  hexene uronic acid

摘要:木质纤维是制造材料、能源和化学品的重要资源。关于木质纤维中纤维素、木素和半纤维素分离的工作多年来一直是人们关注的课题。探究半纤维素的降解和结构变化对于实现植物纤维三大素分离、拓宽生物质精炼的新模式具有重要意义，将为制浆造纸工艺和生物质基材料的发展提供新方法和新思路。本文重点阐述了半纤维素在碱性蒸煮过程中的主要降解产物4-O-甲基葡萄糖醛酸（meGlcA）及其转化物己烯糖醛酸（HexA）含量的测定方法，meGlcA含量的准确测定有助于改进制浆蒸煮工艺条件，提高纤维分离的纯度和成纸质量，更好实现纤维素高值化利用；HexA在制浆过程中影响着漂白工艺化学品的消耗，测定其成分变化能够为降低漂白剂用量提供基础。

Abstract:Lignocellulose plant is an important natural resources for manufacturing material， energy， and chemicals， the fractionation of cellulose， lignin， and hemicellulose is a hot topic being concerned for years. Exploring the degradation rules of hemicellulose and the change of its structure is of great significance to achieve efficient separation of the plants’ three main components. This paper expounded the determination methods of the main degradation products of hemicelluloses during alkaline cooking process， i.e.， 4-O-methylglucuronic acid （meGlcA） and its derivative hexane uronic acid （HexA）. Accurately determining the content of meGlcA would help improve the pulping process and the purity of separated fibers and the quality of resultant paper， so as to achieve high-value application of cellulose. HexA affects the consumption of bleaching chemicalsin bleaching process， its determination could provide helpful message to bleaching stage.