Abstract

Bark from trees is considered a worthless raw material. However, this resource could be economically beneficial if utilized efficiently due to its rich chemical compounds. In this study, an ethanol toluene-soluble extractive, alpha-cellulose and lignin obtained from Leucaena leucocephala bark were characterized to determine their chemical functional groups. Based on FTIR spectral analysis, the results indicated that the bands of the functional groups of the extractive from the original bark remain unchanged; however, the absorbance intensity was found to be weaker in the group frequency and fingerprint regions. Removal of extractive, pectin, hemicellulose and lignin from the bark indirectly increased the strong absorbance intensity of cellulose. Broad peaks of OH stretching found in all spectra were assigned to the presence of phenolic OH and aliphatic structures for extractive and aromatic structures of lignin. It was revealed that aromatic functional groups were mainly found in the extractive, while water, carbonyl and ether were the dominant groups in cellulose, and methyl, methylene, carbonyl and carboxyl groups were enriched in lignin.

Graphic abstract

中文翻译：

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天然白花树皮提取物，纤维素和木质素的化学官能团

摘要

树木的树皮被认为是毫无价值的原材料。但是，由于其丰富的化学化合物而得到有效利用，这种资源在经济上可能会具有经济效益。在这项研究中，乙醇溶于甲苯的萃取，α-纤维素和木质素从获得的银合欢表征树皮以确定其化学官能团。基于FTIR光谱分析，结果表明，原始树皮中提取物的官能团的带保持不变。然而，在组频率和指纹区域中发现吸收强度较弱。从树皮中去除提取物，果胶，半纤维素和木质素间接增加了纤维素的强吸收强度。在所有光谱中发现的广泛的OH拉伸峰被认为是酚OH和木质素的萃取和芳族结构的脂族结构的存在。结果表明，芳香族官能团主要存在于萃取物中，而水，羰基和醚是纤维素中的主要基团，而甲基，亚甲基，

图形摘要