A. vera is also known for useful secondary metabolites.1,17 Anthraquinones, tricyclic aromatic quinines are the major secondary metabolites that are abundantly present. Among the naturally occurring anthraquinone derivatives, Aloe emodin and chrysophanol are the major compounds.18 The tricyclic aromatic quinines of Aloe have been proposed to be synthesized via the type III polyketide biosynthesis pathway.