Antitumor and antimicrobial activities and inhibition of <i>in-vitro</i> lipid peroxidation by <i>Dendrobium nobile</i>

Abstract

The aim of the study was to determine the antitumor and antimicrobial activities as well as the inhibition of in vitro lipid peroxidation evoked by Dendrobium nobile. Antimicrobial activity of different solvent
extracts of flowers and stem of D. nobile against Escherichia coli, Bacillus subtilis, Proteus, Salmonella typhi and Staphylococcus aureus were analyzed separately. The swiss albino mice were induced with
Dalton’s Lymphoma Ascites (DLA) cell lines and the antitumor effect of D. nobile was studied by administering orally the aqueous extracts of the flowers of D. nobile. The antitumor activity was measured in DLA cell line induced mice. Inhibition of in vitro lipid peroxidation activity of the D. nobile in both liver homogenate and RBC ghosts was also carried out. The aqueous extracts of stem and flower of D. nobile showed better zone of bacterial inhibition than that of ethanol and chloroform
extracts. The plant extracts treated DLA cell induced mice showed better tumor regression, and the flowers of the plant inhibited the in vitro lipid peroxidation, significantly. The present work indicates
that the D. nobile flower extracts possessed antimicrobial and antitumor properties in addition to antiperoxidative activity.