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作 者 ：徐鹿鹿

期 刊 ：林业科学 1984年 20卷 1期 页码：57-65

关键词：落叶松；

摘 要 ：为了从化学方面探讨落叶松水泥刨花板生产中存在的缓凝等问题,对落叶松(Larix gmelini)和黄花落叶松(L. olgensis)阿拉伯半乳聚糖进行了分离和鉴定,并测得其在木材中的含量分别为7.0%和10.2%;分子量分别为53000和44000;糖基组成相同,均有阿拉伯糖基、半乳糖基和两种糖醛酸基,其中半乳糖与阿拉伯糖的分子比约为6:1。扫描电镜和差热分析研究表明,落叶松阿拉伯半乳聚搪对水泥的水化结晶过程有严重的不良影响,它能延缓水泥的凝结并降低水泥固化的强度。

Abstract:The arabinogalactans from Larix gmekini and L. olgensis are isolated and characterized, correspondingly, the cotents are 7% and 10.2%, the molecular weights (MW) are 53000 and 44000, respectively. Both species are resemble each other in sugar composition which includes galactose, arabinose and uronic residues, and the ratio of galactose to arabinose is approximately 6. The results of SEM and DTA show that the effect of arabinogalactan on hydration and crystallization of Portland cement is seriously harmful. It is an inhibitor of setting and hardening of Portland cement.

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