竹材(台湾桂竹)的化学和超微结构的研究

<正>对竹材(台湾桂竹)试样的化学组成作了分析研究。对浸提前后及解聚产物的细胞壁结构用电子显微镜进行了观察。定量测定的结果,浸提物为2.6％,木素25.5％,α-纤维素45.3％,多糖24.6％。主要多糖是聚木糖-阿拉伯糖。木糖与阿拉伯糖之比为17:1。电镜照片显示出次生壁中有木素和多糖的层状沉积物。木素很明显地溶解在碱性和酸性试剂中。NaoH溶液主要从次生壁中除去细胞壁物质,而三氟醋酸从复合胞间层除去物质。

A CHEMICAL AND ULTRASTRUCTURAL STUDY OF THE BAMBOO SPECIES PHYLLOSTACHYS MAKINOI HAY.

A sample of Phyllostachys makinoi was investigated by analysis of its chemical composition and electron microscopic observations of the cell wall structure before and after extraction as well as degradation procedures. The quantitative determination resulted in 2.6% extractives, 25.5% lignin, 45.3% alpha-cellulose, and 24.6% pol-yoses. The main polyose is an arabinoxylan with a Xyl: Ara ratio of about 17:1. The electron micrographs show a lamellar deposition of lignin and polyoses within the secondary walls. Lignin is obviously soluble by parts in alkaline as well as in acidic reagents. Sodium hydroxyde solution removes cell wall substance mainly from the secondary walls, whereas trifluoroacetic acid removes substance from the compound middle lamellae.