<?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%">Fendi Yoga Wardana</style></author><author><style face="normal" font="default" size="100%">Defi Kartika Sari</style></author><author><style face="normal" font="default" size="100%">Myrna Adianti</style></author><author><style face="normal" font="default" size="100%">Adita Ayu Permanasari</style></author><author><style face="normal" font="default" size="100%">Lidya Tumewu</style></author><author><style face="normal" font="default" size="100%">Tomoyoshi Nozaki</style></author><author><style face="normal" font="default" size="100%">Aty Widyawaruyanti</style></author><author><style face="normal" font="default" size="100%">Achmad Fuad Hafid</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">In vitro Anti-Amebic Activity of Cage Xanthones from Cratoxylum sumatranum Stem Bark Against Entamoeba histolytica</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%">Amoebiasis</style></keyword><keyword><style  face="normal" font="default" size="100%">Bioactivity-guided isolation</style></keyword><keyword><style  face="normal" font="default" size="100%">Cratoxylum sumatranum</style></keyword><keyword><style  face="normal" font="default" size="100%">Entamoeba histolytica</style></keyword><keyword><style  face="normal" font="default" size="100%">NAD kinase</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2020</style></year><pub-dates><date><style  face="normal" font="default" size="100%">May 2020</style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">12</style></volume><pages><style face="normal" font="default" size="100%">452-458</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p class=&quot;rtejustify&quot;&gt;&lt;strong&gt;Background:&lt;/strong&gt; Amoebiasis is caused by&lt;em&gt; Entamoeba histolytica,&lt;/em&gt; which is a pathogenic species living on human colon tissues. The development of new drugs for anti-amebic are still very needed for clinical treatment. &lt;strong&gt;Objective: &lt;/strong&gt;This aims to identify the compounds in &lt;em&gt;Cratoxylum sumatranum&lt;/em&gt; for their anti-amoeba activity. &lt;strong&gt;Materials and Methods: &lt;/strong&gt;In this study we used bioactivity-guided isolation and structural analysis to identified anti-amebic compounds from dichloromethane extract of &lt;em&gt;Cratoxylum sumatranum&lt;/em&gt; stem bark. Their anti-amebic activity was determined by an &lt;em&gt;in vitro&lt;/em&gt; cell-based assay against&lt;em&gt; Entamoeba histolytica &lt;/em&gt;and an enzymatic assay on NAD kinase.&lt;strong&gt; Results:&lt;/strong&gt; Two known compounds from the cage xanthone groups, namely cochinchinoxanthone (1) and cochinchinone D (2), were isolated. The structures of the cage xanthone compounds were established by extensive spectroscopic data analysis. Compound (1) showed the greatest level of anti-amebic activity both in cell-based and enzymatic assay, yielding IC&lt;sub&gt;50&lt;/sub&gt; values of 4.57 and 12.17 μg/mL, respectively. In contrast, compound (2) yielded IC&lt;sub&gt;50&lt;/sub&gt; values of 5.19 and 12.60 μg/mL, respectively. Conclusion: When considering the demonstrated anti-amebic activities, it becomes apparent that these compounds, isolated from &lt;em&gt;Cratoxylum sumatranum &lt;/em&gt;stem bark, have the potential to be further developed into effective anti-amebic medicine against &lt;em&gt;Entamoeba histolytica.&lt;/em&gt;&lt;/p&gt;
</style></abstract><issue><style face="normal" font="default" size="100%">3</style></issue><work-type><style face="normal" font="default" size="100%">Original Article</style></work-type><section><style face="normal" font="default" size="100%">452</style></section><auth-address><style face="normal" font="default" size="100%">&lt;p&gt;&lt;strong&gt;Fendi Yoga Wardana&lt;sup&gt;1&lt;/sup&gt;, Defi Kartika Sari&lt;sup&gt;2&lt;/sup&gt;, Myrna Adianti&lt;sup&gt;2,3&lt;/sup&gt;, Adita Ayu Permanasari&lt;sup&gt;2&lt;/sup&gt;, Lidya Tumewu&lt;sup&gt;2&lt;/sup&gt;, Tomoyoshi Nozaki&lt;sup&gt;4&lt;/sup&gt;, Aty Widyawaruyanti&lt;sup&gt;2,5&lt;/sup&gt;, Achmad Fuad Hafid&lt;sup&gt;2,5,&lt;/sup&gt;* &lt;/strong&gt;&lt;/p&gt;

&lt;p&gt;&lt;sup&gt;1&lt;/sup&gt;Graduate Program of Pharmaceutical Sciences, Faculty of Pharmacy, Universitas Airlangga, Surabaya, 60115, INDONESIA.&lt;/p&gt;

&lt;p&gt;&lt;sup&gt;2&lt;/sup&gt;Natural Product Medicine Research and Development, Institute of Tropical Disease, Universitas Airlangga, Surabaya, 60115, INDONESIA.&lt;/p&gt;

&lt;p&gt;&lt;sup&gt;3&lt;/sup&gt;Department of Health, Faculty of Vocational Education, Universitas Airlangga, Surabaya, 60115, INDONESIA.&lt;/p&gt;

&lt;p&gt;&lt;sup&gt;4&lt;/sup&gt;Department of School of International Health, Laboratorium of Biomedical Chemistry, The University of Tokyo, Tokyo, 113-0033, JAPAN.&lt;/p&gt;

&lt;p&gt;&lt;sup&gt;5&lt;/sup&gt;Department of Pharmacognosy and Phytochemistry, Faculty of Pharmacy, Universitas Airlangga, Surabaya, 60115, INDONESIA.&lt;/p&gt;
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