<?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%">Muniyandi Anbukkarasi</style></author><author><style face="normal" font="default" size="100%">Philip A Thomas</style></author><author><style face="normal" font="default" size="100%">Mahalingam Sundararajan</style></author><author><style face="normal" font="default" size="100%">Pitchairaj Geraldine</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Gas Chromatography - Mass Spectrometry Analysis and In vitro Antioxidant Activity of the Ethanolic Extract of the Leaves of Tabernaemontana divaricata</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%">antioxidant activity</style></keyword><keyword><style  face="normal" font="default" size="100%">GC-MS analysis</style></keyword><keyword><style  face="normal" font="default" size="100%">Metal chelating activity.</style></keyword><keyword><style  face="normal" font="default" size="100%">Phytoconstituents</style></keyword><keyword><style  face="normal" font="default" size="100%">Reducing power</style></keyword><keyword><style  face="normal" font="default" size="100%">Tabernaemontana divaricata</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2016</style></year><pub-dates><date><style  face="normal" font="default" size="100%">Oct 2016</style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">8</style></volume><pages><style face="normal" font="default" size="100%">451-458</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;Objective:&lt;/strong&gt; To identify phytoconstituents present in an ethanolic extract of the leaves of &lt;em&gt;Tabernaemontana divaricata &lt;/em&gt;and to evaluate its in-vitro antioxidant potential. &lt;strong&gt;Methods:&lt;/strong&gt; The extract was subjected to gas chromatography- mass spectrometry analysis to identify phytoconstituents, and screened for hydroxyl, superoxide and 1, 1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity, reducing power and metal-chelating activity as a measure of potential antioxidant activity. &lt;strong&gt;Results:&lt;/strong&gt; GC-MS analysis of the extract revealed the presence of 96 phytoconstituents, of which 17 are reported to be bioactive and 11 of these to possess antioxidant potential. When tested&lt;em&gt; in-vitro&lt;/em&gt;, the extract exhibited the most potent radical-scavenging activity at a maximum concentration of 10 mg/ml, scavenging effects of 64%, 67% and 69% and corresponding half maximal inhibitory concentration (IC&lt;sub&gt;50&lt;/sub&gt;) values of 6.7 mg/ml, 6.8 mg/ml and 6.2 mg/ml on hydroxyl, superoxide and DPPH radicals, respectively. Ascorbic acid used as a standard (10 mg/ml) showed scavenging effects of 73%, 73% and 75% and corresponding IC&lt;sub&gt;50 &lt;/sub&gt;values of 5.3 mg/ml, 5.8 mg/ml and 5.2 mg/ml, respectively, on hydroxyl, superoxide and DPPH radicals. At 10 mg/ml, the extract and an ethylenediaminetetraacetic acid standard exhibited 68% and 78%, respectively, chelation of ferrous ions; at the same concentration, the reducing power of the extract and that of a butylated hydroxytoluene standard was found to be 3.855 and 4.308, respectively.&lt;strong&gt; Conclusion:&lt;/strong&gt; These observations strongly suggest that the ethanolic extract of &lt;em&gt;T. divaricata&lt;/em&gt; leaves has potent&lt;em&gt; in-vitro&lt;/em&gt; antioxidant activity and thereby could act as a possible therapeutic agent for oxidative stressinduced pathological states.&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%">451</style></section><auth-address><style face="normal" font="default" size="100%">&lt;p&gt;&lt;strong&gt;Muniyandi Anbukkarasi&lt;sup&gt;1&lt;/sup&gt;, Philip A Thomas&lt;sup&gt;2&lt;/sup&gt;, Mahalingam Sundararajan&lt;sup&gt;1&lt;/sup&gt;, Pitchairaj Geraldine&lt;sup&gt;1*&lt;/sup&gt;&lt;/strong&gt;&lt;/p&gt;

&lt;p&gt;&lt;sup&gt;1&lt;/sup&gt;Department of Animal Science, School of Life Sciences, Bharathidasan University, Tiruchirappalli- 620 024, Tamil Nadu, INDIA.&lt;/p&gt;

&lt;p&gt;&lt;sup&gt;2&lt;/sup&gt;Department of Ocular Microbiology, Institute of Ophthalmology, Joseph Eye Hospital, Tiruchirappalli- 620 001, Tamil Nadu, INDIA.&lt;/p&gt;
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