@article {698, title = {Analysis of bioactive constituents of n-hexane and methanol fractions of Vernonia calvoana Extracts using Gas Chromatography- Mass Spectrometry}, journal = {Pharmacognosy Journal}, volume = {10}, year = {2018}, month = {August 2018}, pages = {854-858}, type = {Original Article}, chapter = {854}, abstract = {

Aim: Bioactive constituents of n-hexane and methanol fractions of Vernonia calvoana (VC) leaves were evaluated using Gas chromatography-Mass spectrometry. Method: The leaves were harvested, cleaned and air dried for 7 days. They were ground to yield 5kg weight powder which was macerated and extracted in 8000 mL of 80\% ethanol for 48 hours, yielding 310.3g (6.2\%) of crude extract after evaporation of the solvent. The paste (251.8g) was subjected to column chromatography over silica gel (mesh 60 \– 120\μm) and eluted with 1.5L of n-hexane and methanol respectively. The fractions were analyzed for bioactive constituents using Gas chromatography-Mass spectrometry (GC-MS) (30m x 0.25mm ID x 0.25\μm film thickness). Result: The results of GC-MS analysis showed the presences of twelve compounds with phytol (46.67\%), 8,11,14-eicosatrienoic acid (33.40\%), octadecanoic acid (11.25\%), pentadecane carboxylic acid (10.69\%), 9, 12, 15-octadecatrien-1-ol (8.12\%) and ethyl palmitate (7.68\%) in the n-hexane fraction, while methanol fraction was observed to have 14 compounds with oleic acid (33.40\%), hexadecanoic acid (12.49\%), 2-butanone (14.32\%), palmitadehyde (8.36\%), 11-octadecenoic acid (5.56\%), Z-4-nonadecen-1-ol-acetate (5.36\%) and limonene Oxide (4.37\%) as well as other compounds in trace concentrations. Conclusion: it may be concluded from the results that, extracts of Vernonia calvoana contain various bioactive components that may be exploited as a good source of new drug for pharmaceutical industries.

}, keywords = {Bioactive constituents, Methanol, n-hexane, Vernonia calvoana}, doi = {10.5530/pj.2018.5.144}, author = {Iwara A. Iwara and Godwin O. Igile and Friday E. Uboh and Mbeh U. Eteng and Patrick .E. Ebong} }