Phytochemical analysis and bioactivity reports of ethnomedicinal plants from West Bengal, India.

The biodiversity-rich forests of the Jhargram subdivision of West Bengal, India houses many lesser-known prospective plants. Four ethnomedicinal plants from this locality- Cleistanthus collinus , Tiliacora racemosa , Eupatorium odoratum , and Sida acuta reported for traditional medical uses by local forest tribes have been analyzed for phytochemical constituents and bioactivity potential, viz., antioxidant, antibacterial and antitumor activity. Cleistanthus and Tiliacora plants were rich in alkaloids while Eupatorium and Sida showed tannin abundance. Tiliacora showed maximum alkaloid content, that is, 711 mg strychnine equivalent/gm dry weight. Consequently, these plant extracts showed decent antioxidant activity which is reflected in their antibacterial and antitumor potencies. Cleistanthus showed strong bactericidal activity against Gram-negative bacteria, particularly against Klebsiella pneumoniae and Pseudomonas aeruginosa , while Tiliacora showed robust antitumor activity against cervical cancer cells SiHa at a 50% inhibitory concentration (IC 50 ) of 86 µg/ml. Hence, the biodiversity-rich Jhargram forest should be conserved to protect the potential repertoire for ethnomedicinal plants.