Does anyone know a protocol to remove/eliminate/precipitate tannins from aqueous extracts of plant leaves?
Thank you.
Poly(vinyl alcohol) should bind tannin in water solution, resulting in brown gum-like solid. Also spray drying is very good method to extract tannin from the water solution. I recommend you the work of Antonio Pizzi, who spend almost 40 years studying tannin and other bio-sourced materials.
I have the opposite problem. I extract chokeberry fruits with water-ethanol solutions and tannins (probably) precipitates with anthocyanins during ethanol evaporation. For this reason I loose part of anthocyanins with precipitates.
This causes another problems - with filtration in lab, pilot and production scale.
I cannot use Sephadex - it's very troublesome in industrial scale.
Tannins can be precipitated as a lead tannates on treatment of aqueous solution of it with lead acetate where tannin precipitates as a lead tannate, can be filtered as a solid .
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