Studies on the lignin of the bamboo species Phyllostachys makinoi Hay.

Milled wood lignin(MWL) isolated from Phyllostachysmakinoi was investigated by chemical and physical methods. The bamboo ligninis 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 compared to wood lignin. With NaOH and TFA mainly an arabinoxylanwith a Xyl: Ara ratio of 14:1 was extracted from bamboo saw dust. The ligninproportion in the NaOH extract, which derives mainly from the secondary walls has a lower methoxyl content, the ligninproportion in the TFA extract, which derives from the compound middle lamellaehas a higher methoxyl content compared to MWL.