Characterization of Lawsonia inermis (Henna) as Vegetable Tanning Material

Abstract

Phytochemical studies on the chemistry of polyphenolic constituents, isolation and identification have revealed that henna leaves contain condensed tannin (11.12%). The components leucocyandin, epicatechin, catechin and quercitrin were identical with that of the authentic samples. Main colouring substance of henna (The lawsone) was identified as 2- hydroxy-1,4-naphthoquinone.Analysis of henna leaves extract was studied by ultraviolet (UV). The spray drying of aqueous henna leaves extract gave about 33-35% yield, a brown and fine powder using the co-current spray drier apparatus.