Qualitative and quantitative determination of lignin in different types of Iraqi Phoenix dactylifera Date palm pruning woods

Abstract

The target of this study is to find analytical data base for Iraqi phoenix date palm pruning woods, which produced by pruning process at the season of date palm production. Lignin has been extracted and purified for five  types of Iraqi date palm using Klason lignin method. The weight of the extracted lignin ranged from (0.473 g – 0.600 g) and the lignin % ranged from (23.5 – 30). The other ingredients (waxes, oils, resin, and proteins of wood gums) % ranged from (11.2 – 53.5). FT– IR Characterization showed that the (-OH) phenolic group appear in Digal lignin structure only and dis appear in other lignin samples, and the (4-O-5 inter monomeric lignin linkage) showed moderate to weak  intensity peaks for all studied samples except the Humrani sample at (1271 cm-1) has a strong intensity peak. Also (DODO inter monomeric lignin linkage) showed strong intensity peaks for each (Humrani at 1116 cm-1, and Tibarzal at 1111 cm^-1). UV – Vis. Characterization showed that the lowest absorption maximum (267 nm) corresponds to Basrawi lignin sample, While the highest absorption maximum (297 nm) corresponds to Tibarzal lignin sample.

Keywords: Qualitative and quantitative determination , pruning woods, lignin, Phoenix dactylifera.