<?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%">Meri Susanti</style></author><author><style face="normal" font="default" size="100%">Sanusi Ibrahim</style></author><author><style face="normal" font="default" size="100%">Yahdiana Harahap</style></author><author><style face="normal" font="default" size="100%">Dachriyanus</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Comparison between High Performance Thin Layer Chromatography and High Performance Liquid Chromatography Methods for Determination of Rubraxanthone in the Stem Bark Extract of Garcinia cowa Roxb</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%">Garcinia cowa Roxb</style></keyword><keyword><style  face="normal" font="default" size="100%">High Performance Liquid Chromatography</style></keyword><keyword><style  face="normal" font="default" size="100%">High performance Thin layer Chromatography</style></keyword><keyword><style  face="normal" font="default" size="100%">rubraxanthone</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%">November 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%">s42-s47</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;Objectives:&lt;/strong&gt; To develop simple, rapid, accurate methods for determination of rubraxanthone in the stem bark extract of &lt;em&gt;Garcinia cowa&lt;/em&gt; using High Performance Thin Layer Chromatography (HPTLC) and High Performance Liquid Chromatography (HPLC). &lt;strong&gt;Methods:&lt;/strong&gt; The HPTLC method was performed on aluminum plate precoated with silica gel 60 F254 using Chloroform: Ethyl acetate: Methanol: Formic acid (88:2:2:8) as a developing system. Quantification was achieved using densitometric measurements at 243 nm. The HPLC method involved a 5 &amp;mu;m C18 column and an isocratic solvent using 0.4% formic acid: methanol (12:88) with a flow rate 1 mL minute-&lt;sup&gt;1&lt;/sup&gt;. Quantitation was also achieved with ultraviolet detection at 243 nm based on peak area. All necessary validation tests for both methods were done for their comparison. The results obtained by these two different quantification methods were compared by Tukey&amp;rsquo;s-test. &lt;strong&gt;Results:&lt;/strong&gt; Both assays provided good linearity, accuracy, precision, specificity and limits of detection and quantitation for determination of rubraxanthone in The Stem Bark extract of &lt;em&gt;G. cowa.&lt;/em&gt; &lt;strong&gt;Conclusion:&lt;/strong&gt; Both methods revealed reasonable validation parameters concerning linearity, accuracy, precision, specificity and limits of detection and quantitation. A statistical comparison of the quantitative analysis of rubraxanthone in extract did not show any statistically significant difference between two analysis methods. As both methods were found to be equal, they therefore can be used for the analysis of rubraxanthone in the Stem Bark extract of &lt;em&gt;G. cowa&lt;/em&gt;.&lt;/p&gt;</style></abstract><issue><style face="normal" font="default" size="100%">6s</style></issue><work-type><style face="normal" font="default" size="100%">Original Article</style></work-type><section><style face="normal" font="default" size="100%">s42</style></section><auth-address><style face="normal" font="default" size="100%">&lt;p&gt;&lt;strong&gt;Meri Susanti&lt;sup&gt;1&lt;/sup&gt;, Sanusi Ibrahim&lt;sup&gt;2&lt;/sup&gt;, Yahdiana Harahap&lt;sup&gt;3&lt;/sup&gt;, Dachriyanus&lt;sup&gt;1,&lt;/sup&gt;*&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;&lt;sup&gt;1&lt;/sup&gt;Faculty of Pharmacy, Andalas University, West Sumatra, 25163, INDONESIA.&lt;/p&gt;
&lt;p&gt;&lt;sup&gt; 2&lt;/sup&gt;Department of Chemistry, Faculty of Mathematics and Natural Sciences, Andalas University, West Sumatra, 25163, INDONESIA.&lt;/p&gt;
&lt;p&gt;&lt;sup&gt;3&lt;/sup&gt;Faculty of Pharmacy, Universitas Indonesia, 16424, INDONESIA.&lt;/p&gt;</style></auth-address></record><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%">Dachriyanus</style></author><author><style face="normal" font="default" size="100%">Nova Susanti Asjar</style></author><author><style face="normal" font="default" size="100%">Meri Susanti</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Determination of Rubraxanthone in the Latex of Asam Kandis (Garcinia cowa Roxb) by Reverse Phase High Performance Liquid Chromatography.</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%">Counterfeiting</style></keyword><keyword><style  face="normal" font="default" size="100%">Isocratic method</style></keyword><keyword><style  face="normal" font="default" size="100%">Latex of Garcinia cowa Roxb</style></keyword><keyword><style  face="normal" font="default" size="100%">RP-HPLC</style></keyword><keyword><style  face="normal" font="default" size="100%">rubraxanthone</style></keyword><keyword><style  face="normal" font="default" size="100%">Standarization</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2017</style></year><pub-dates><date><style  face="normal" font="default" size="100%">February 2017</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://phcogj.com/fulltext/317</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">9</style></volume><pages><style face="normal" font="default" size="100%">288-291</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;Context:&lt;/strong&gt; Rubraxanthone is a major compound found in &lt;em&gt;Garcinia cowa&lt;/em&gt; Roxb which has various biological activities. This compound is likely to be responsible for the pharmacological activities of this plant. The latex of this plant was one of the source of this compound. To prevent counterfeiting, it is essential to develop a method of analysis to determine the levels of these compounds in the latex of &lt;em&gt;G. cowa&lt;/em&gt;. &lt;strong&gt;Aims:&lt;/strong&gt; To develop and validated a reverse phase-high performance liquid chromatography (RP-HPLC) technique for determination of rubraxanthone in the latex of &lt;em&gt;G. cowa&lt;/em&gt;. &lt;strong&gt;Settings and Design:&lt;/strong&gt; RP-HPLC analysis. &lt;strong&gt;Methods and Material:&lt;/strong&gt; The sample was powdered and dissolve in methanol and then subjected to Reverse Phase High Performace Liquid Chromatoraphy (RP-HPLC). Separation was carried out in a reversed-phase column Shimadzu Shimp-pack VP&amp;ndash;ODS (4.6 x 250 mm). The elution was performed with isocratic solvent using formic acid 0.4 % v/v in methanol (15:85) with a flow rate 1 ml/minute. The solvents used for the mobile phase were filtered through membrane filter (0.45 mm pore size) and degassed before use. Total running time was 20 minutes and the sample injection volume of injection was 20 ml. While the wavelength of the UV-VIS detector was set at 243.2 nm. &lt;strong&gt;Results:&lt;/strong&gt; The detection and the quantitation limits of rubraxanthone were 1.119 mg/mL and 3.731 &amp;mu;g/mL, respectively. A regression analysis was performed, with the observation of good linearity (r = 0.998). The values obtained for precision and accuracy determination are in agreement with ICH guidelines. It was found that rubraxanthone in dichloromethane extract of latex &lt;em&gt;G. cowa&lt;/em&gt; was 56.56%. &lt;strong&gt;Conclusions:&lt;/strong&gt; The results demonstrated that the developed method is a reliable HPLC technique for determination of rubraxanthone in the latex of &lt;em&gt;G. cowa&lt;/em&gt;.&lt;/p&gt;</style></abstract><issue><style face="normal" font="default" size="100%">2</style></issue><work-type><style face="normal" font="default" size="100%">Original Article</style></work-type><section><style face="normal" font="default" size="100%">288</style></section><auth-address><style face="normal" font="default" size="100%">&lt;p style=&quot;text-align: justify;&quot;&gt;&lt;strong&gt;Dachriyanus*, Nova Susanti Asjar, Meri Susanti &lt;/strong&gt;&lt;/p&gt;
&lt;p style=&quot;text-align: justify;&quot;&gt;Department of Andalas University, Kampus Limau Manis, Padang, West Sumatra, Indonesia.&amp;nbsp;&lt;/p&gt;</style></auth-address></record></records></xml>