<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Iwara A. Iwara</style></author><author><style face="normal" font="default" size="100%">Godwin O. Igile</style></author><author><style face="normal" font="default" size="100%">Friday E. Uboh</style></author><author><style face="normal" font="default" size="100%">Mbeh U. Eteng</style></author><author><style face="normal" font="default" size="100%">Patrick .E. Ebong</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Analysis of bioactive constituents of n-hexane and methanol fractions of Vernonia calvoana Extracts using Gas Chromatography- Mass Spectrometry</style></title><secondary-title><style face="normal" font="default" size="100%">Pharmacognosy Journal</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Bioactive constituents</style></keyword><keyword><style  face="normal" font="default" size="100%">Methanol</style></keyword><keyword><style  face="normal" font="default" size="100%">n-hexane</style></keyword><keyword><style  face="normal" font="default" size="100%">Vernonia calvoana</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2018</style></year><pub-dates><date><style  face="normal" font="default" size="100%">August 2018</style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">10</style></volume><pages><style face="normal" font="default" size="100%">854-858</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p style=&quot;text-align: justify;&quot;&gt;&lt;strong&gt;Aim:&lt;/strong&gt; Bioactive constituents of n-hexane and methanol fractions of &lt;em&gt;Vernonia calvoana&lt;/em&gt; (VC) leaves were evaluated using Gas chromatography-Mass spectrometry. &lt;strong&gt;Method:&lt;/strong&gt; 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 &amp;ndash; 120&amp;mu;m) 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&amp;mu;m film thickness). &lt;strong&gt;Result:&lt;/strong&gt; 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. &lt;strong&gt;Conclusion:&lt;/strong&gt; 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.&lt;/p&gt;</style></abstract><issue><style face="normal" font="default" size="100%">5</style></issue><work-type><style face="normal" font="default" size="100%">Original Article</style></work-type><section><style face="normal" font="default" size="100%">854</style></section><auth-address><style face="normal" font="default" size="100%">&lt;p style=&quot;text-align: justify;&quot;&gt;&lt;strong&gt;Iwara A. Iwara*, Godwin O. Igile, Friday E. Uboh, Mbeh U. Eteng, Patrick .E. Ebong &lt;/strong&gt;&lt;/p&gt;
&lt;p style=&quot;text-align: justify;&quot;&gt;Department of Biochemistry, Faculty of Basic Medical Sciences, University of Calabar, P.M.B 1115, Calabar, NIGERIA.&lt;/p&gt;</style></auth-address></record></records></xml>