Application Aloin, a natural mixed diastereomer (A/B) anthracycline from aloe plant, is studied as an antineoplastic agent that enhances melanogenesis and transglutaminase activity. Aloin A is used as a stabilizer in the preparation of gold and silver nanoparticles. Biochem/physiol Actions Purgative activity in rats requires activation by Eubacterium sp. strain BAR or similar intestinal anaerobe, presumably by conversion to aloe-emodin anthrone.1