ABSTRACT

This research was conducted to identify and compare the chemical compositions in Persian silk tree (Albizia julibrissin Durazz.) from different parts of wood and bark, using Fourier Transform Infrared (FTIR) Spectroscopy, gas and liquid chromatography coupled to mass spectrometry (GC-MS, LC-MS), and elemental analysis. FTIR analysis showed significant differences in the chemical structure of bark and wood at peaks that belong to the cellulose and hemicelluloses. According to the results, the C-O-C asymmetric stretch vibration in cellulose and hemicelluloses peak of Persian silk tree was lower in the bark and ѵC=O in quinone or p-quinone peak was higher in the bark. The results of GC-MS showed 12 chemical constituents in the bark and 43 in the wood, respectively. Among these, hexadecanoic acid and inositol were in common. According to the LC-MS analyses, bark samples were rich in lignan compositions and triterpenoid saponins, whereas wood was poor in these compositions. Altogether 61 compositions have been tentatively identified and described from bark and wood tissues; many of them were identified for the first time. Energy-dispersive X-ray (EDX) spectrometry illustrated that the bark contained iron and aluminium, sodium, phosphorus, sulphur and chlorine, while these elements did not exist in wood.

摘要

本研究旨在鉴定和比较波斯合欢树 ( Albizia julibrissin ) 中的化学成分Durazz.) 来自木材和树皮的不同部分，使用傅里叶变换红外 (FTIR) 光谱、气相色谱和液相色谱与质谱（GC-MS、LC-MS）和元素分析相结合。FTIR 分析表明，在属于纤维素和半纤维素的峰处，树皮和木材的化学结构存在显着差异。结果表明，合欢树纤维素和半纤维素的COC不对称伸缩振动峰在树皮中较低，而醌或对醌峰中的ѵC=O在树皮中较高。GC-MS 的结果显示树皮中有 12 种化学成分，木材中有 43 种化学成分。其中，十六烷酸和肌醇是常见的。根据 LC-MS 分析，树皮样品富含木脂素成分和三萜皂甙，而木材在这些成分中的含量很差。总共从树皮和木材组织中初步鉴定和描述了 61 种成分；他们中的许多人是第一次被确认。能量色散 X 射线 (EDX) 光谱分析表明，树皮中含有铁和铝、钠、磷、硫和氯，而这些元素在木材中是不存在的。