An improved method for preparing Catechin (98%) isolated from Acacia catechu having antioxidant activity which comprises purification and re-purification of raw materials by known methods to obtain an analytically pure sample fit for the biological studies, maximizing the active content by diffusion, dissolving crude catechin mixture in DM water and boiling the same, filtering the suspension formed & the contents evaporated, the filtrate thus obtained was further left at RT for suitable hours viz 35-40 hrs, and the first crop of the partially purified mixture was obtained the ethanolic extract after second de-colorization (using active charcoal) was distilled under vacuum & the residue re-dissolved in hot DM water, the contents were left to stand for overnight or maximum upto 24 hrs and the precipitate filtered and air dried to yield the product which is Catechin (98%).
