Phytochemical and allelopathic studies of Terminalia catappa L. (Combretaceae)

Publication date: April 2012 Source:Biochemical Systematics and Ecology, Volume 41 Author(s): Tatiana de Gouveia Baratelli , Anne Caroline Candido Gomes , Ludger A. Wessjohann , Ricardo Machado Kuster , Naomi Kato Simas The allelopathic potential of Terminalia catappa L. Combretaceae fruits and leaves on Lactuca sativa L. (lettuce), Euphorbia heterophylla L. and Commelina benghalensis L. was studied. Bioassays indicated the highest activity for dichloromethane and ethyl-acetate fractions of ethanolic extracts from fruits, and the mean effective concentration (EC50) was determined. 2-Pentadecanone; vanillic, siringic, ferulic, p-coumaric, palmitic and stearic acids were characterized in the dichloromethane fraction, and 3,4,4′-tri-O-methyl ellagic acid and β-sitosterol-3-O-β-d-glucoside were isolated from it. No allelopathic effects were observed when the dichloromethane extracts of T. catappa fruit or leaf extracts were applied to the weeds E. heterophylla and C. benghalensis. Bioassays with seasonal sampling revealed an influence on the allelochemical potential of T. catappa. Considering the methodology adopted and the experimental results, the allelopathic activity of T. catappa seems to be related to the interaction of different groups of substances, some of them identified and characterized in this work. Highlights ► Terminalia catappa fruits exhibited allelopathic activity on Lactuca sativa model. ► β-Sitosterol-3-O-β-d-glucoside was active as an alle...

Source: Biochemical Systematics and Ecology - November 1, 2014 Category: Biochemistry Source Type: research