竹材(台湾桂竹)木素的研究

<正>用化学和物理方法研究了从台湾桂竹中分离出来的磨木木素(MWL)。从甲氧基含量高以及红外光谱中各吸收峰可知在竹材木素中富含丁香基。芳香环的特殊的吸收峰是由末端对-香豆酯基引起的。在紫外吸收光谱中在280nm范围内的最大消光系数比起木材木素来向长波方向移动。从竹粉中用氢氧化钠和三氟醋酸浸提出来的主要是阿拉伯木聚糖,其中木糖与阿拉伯糖之比为14:1。从次生壁中被氢氧化钠浸提出来的木素组成中甲氧基含量低于MWL中含量;从复合胞间层中用三氟醋酸浸提出来的木素组成中甲氧基含量较MWL中高。

STUDIES ON THE LIGNIN OF BAMBOO SPECIES PHYLLOSTACHYS MAKINOI HAY

Milled wood lignin (MWL) isolated from Phyllostachys makinoi was investigated by chemical and physical methods. The bamboo lignin is rich in syringyl units, which is indicated by a high methoxyl content and respective bands in the IR spectrum. The distinct absorption bands for aromatic ring vibrations are attributed to final p-coumaryl ester groups. In the UV spectrum the extinction maximum in the range of 280 nm is shifted to longer wavelengths as compared to wood lignin. With NaOH and TFA, mainly arabinoxylan with an Xyl : Ara ratio of 14 : 1 was extracted from bamboo saw dust. The Hgnin proportion in the NaOH extract derived mainly from the secondary walls has a lower methoxyl content, while the lignin proportion in the TFA extract derived from the compound middle lamellae has a higher methoxyl content than in the MWL.