南京林业大学学报(自然科学版) ›› 1986, Vol. 10 ›› Issue (01): 9-18.doi: 10.3969/j.jssn.1000-2006.1986.01.002

• 研究论文 • 上一篇    下一篇

重阳木木质素的研究——Ⅱ、今、古重阳木木质素的对比

邰瓞生   

  1. 南京林学院林产化学工程系
  • 出版日期:1986-03-18 发布日期:1986-02-18

STUDIES OF LIGNIN FROM BISCHOFIA POLYCARPA (LEVL.) AIRY-SHAW ——I. COMPARITIVE STUDIES OF RECENT AND ANCIENT B. POLYCARPA LIGNINS

Tai Diesheng   

  1. Department of Chemical Processing of Forest Products
  • Online:1986-03-18 Published:1986-02-18

摘要: <正>一、前言 1971年,在湖北宜昌葛洲坝附近兴修水利工程中,发现了埋于长江江底沙石层下的古树层。本文研究的古重阳木是江底沙石层下古树层中较完整的一株树木。出土时尚有较完整的树根形态与第一枝椏痕迹,仅树干表面炭化龟裂,内部材质较完好,是世界上木材天然保存极为罕见的发现,经碳14同位素测定距今已有6570±110年。 今、古重阳木化学成份比较分析的结果已证明古木在乏气条件下半纤维素首先分解,损失较多;纤维素含量下降不多,而木质素最稳定。

Abstract: Both the recent and ancient B. polycarpa MWLS were characterized by chemical and spectral methods. No remarkable structural differences between the recent and ancient lignins were found. The slight changes of the lignin structure were revealed by the decrease of the molecular weight and methtoxyl groups, and the increase of the hydroxyl groups, chromophores and the condensed units.