Åbo Akademi University, Process Chemistry Centre, c/o Laboratory of Wood and Paper Chemistry, Turku/Åbo, Finland.
Carbohydr Res. 2012 May 1;352:151-8. doi: 10.1016/j.carres.2012.01.005. Epub 2012 Jan 26.
Norway spruce O-acetyl-galactoglucomannans (GGM) are water-soluble hemicelluloses that have potential to be produced in large scale as a side product of the mechanical pulping industry or by hot-water extraction of wood. Chemical modification is often needed to tailor such water-soluble polysaccharides into industrially valuable compounds. In this work, treatment of GGM with butyric and benzoic anhydride in pyridine/dimethylformamide rendered GGM derivatives, which were hydrophobic and partially soluble in organic solvents. The degree of substitution can be adjusted by varying the quantity of the reagent and reaction temperature. The dn/dc value for the benzoyl ester of GGM was determined in 0.05 M LiBr DMSO in order to obtain accurate molar mass analysis with SEC-MALLS-RI. Novel substances with adjusted hydrophobicity can thus be prepared on one step synthesis from natural hemicelluloses, which then showed a slight increase in the molar mass upon esterification.
挪威云杉 O-乙酰半乳糖基甘露聚糖（GGM）是水溶性半纤维素，有可能作为机械制浆工业的副产物或通过热水提取木材大量生产。通常需要对这种水溶性多糖进行化学修饰，将其转化为具有工业价值的化合物。在这项工作中，用丁酸酐和苯甲酸酐在吡啶/二甲基甲酰胺中处理 GGM，得到了疏水的部分可溶于有机溶剂的 GGM 衍生物。通过改变试剂的用量和反应温度，可以调节取代度。通过在 0.05 M LiBr DMSO 中测定 GGM 的苯甲酰酯的 dn/dc 值，从而可以使用 SEC-MALLS-RI 进行准确的摩尔质量分析。可以通过一步合成从天然半纤维素制备具有调整后疏水性的新型物质，酯化后摩尔质量略有增加。
