<?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%">Helmi</style></author><author><style face="normal" font="default" size="100%">Nanang Fakhrudin</style></author><author><style face="normal" font="default" size="100%">Arief Nurrochmad</style></author><author><style face="normal" font="default" size="100%">Ari Sudarmanto</style></author><author><style face="normal" font="default" size="100%">Zullies Ikawati</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Caesalpinia sappan L. Wood is a Potential Source of Natural Phosphodiesterase-1 Inhibitors</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%">Brazilin</style></keyword><keyword><style  face="normal" font="default" size="100%">Caesalpinia sappan L.</style></keyword><keyword><style  face="normal" font="default" size="100%">Herbal cognitive enhancer</style></keyword><keyword><style  face="normal" font="default" size="100%">Phosphodiesterase inhibitor</style></keyword><keyword><style  face="normal" font="default" size="100%">Phytotheraphy</style></keyword><keyword><style  face="normal" font="default" size="100%">Tetraacetylbrazilin</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%">September 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%">1206-1217</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;Introduction: &lt;/strong&gt;A decrease in cAMP and cGMP levels in the brain is linked to human cognitive problems. The degradation of cellular cAMP and cGMP is attributed to phosphodiesterases (PDEs), which constitute a superfamily of enzymes. The inhibition of PDE1 is a promising mechanism to increase cAMP and cGMP levels associated with cognitive disorders. &lt;em&gt;Caesalpinia sappan&lt;/em&gt; L. (CS) wood is a natural coloring agent usually consumed as a traditional refreshment or drink by people in Yogyakarta, Indonesia. However, scientific evidence regarding the inhibitory activity of CS wood against PDE1 has yet to be obtained. This study aimed to investigate the potency of CS wood as a PDE1 inhibitor. &lt;strong&gt;Methods: &lt;/strong&gt;The ethanol extract of CS wood and its fractions were evaluated &lt;em&gt;in vitro&lt;/em&gt; by using a cyclic nucleotide phosphodiesterase assay kit. The presence of brazilin in the extract and fractions was analyzed by thin-layer chromatography.&lt;em&gt; In silico &lt;/em&gt;assay was performed using MOE software to obtain insights into the interaction between compounds in the CS wood and the enzyme. &lt;strong&gt;Results: &lt;/strong&gt;Ethanol extract and ethyl acetate soluble fraction effectively inhibited the PDE1 activity. Interestingly, brazilin, the major compound in CS wood, also exhibited a potent inhibitory effect on the enzyme. The &lt;em&gt;in silico &lt;/em&gt;assay revealed that the interaction between tetraacetylbrazilin and brazilin with the PDE1B active site involved hydrogen bonding and π–π interactions. &lt;strong&gt;Conclusion: &lt;/strong&gt;Ethanol extract, ethyl acetate soluble fraction, and brazilin inhibited the PDE1 activity. CS wood and its chemical constituent could be developed as natural cognitive enhancers.&lt;/p&gt;
</style></abstract><issue><style face="normal" font="default" size="100%">6</style></issue><work-type><style face="normal" font="default" size="100%">Original Article</style></work-type><section><style face="normal" font="default" size="100%">1206</style></section><auth-address><style face="normal" font="default" size="100%">&lt;p class=&quot;rtejustify&quot;&gt;&lt;strong&gt;Helmi&lt;sup&gt;1&lt;/sup&gt;, Nanang Fakhrudin&lt;sup&gt;2,&lt;/sup&gt;*, Arief Nurrochmad&lt;sup&gt;3&lt;/sup&gt;, Ari Sudarmanto&lt;sup&gt;4&lt;/sup&gt;, Zullies Ikawati&lt;sup&gt;3&lt;/sup&gt; &lt;/strong&gt;&lt;/p&gt;

&lt;p class=&quot;rtejustify&quot;&gt;&lt;sup&gt;1&lt;/sup&gt;Faculty of Pharmacy, Universitas Gadjah Mada, Sekip Utara, Yogyakarta 55281, INDONESIA.&lt;/p&gt;

&lt;p class=&quot;rtejustify&quot;&gt;&lt;sup&gt;2&lt;/sup&gt;Department of Pharmaceutical Biology, Faculty of Pharmacy, Universitas Gadjah Mada, Sekip Utara, Yogyakarta 55281, INDONESIA.&lt;/p&gt;

&lt;p class=&quot;rtejustify&quot;&gt;&lt;sup&gt;3&lt;/sup&gt;Department of Pharmacology and Clinical Pharmacy, Faculty of Pharmacy, Universitas Gadjah Mada, Sekip Utara, Yogyakarta 55281, INDONESIA.&lt;/p&gt;

&lt;p class=&quot;rtejustify&quot;&gt;&lt;sup&gt;4&lt;/sup&gt;Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Universitas Gadjah Mada, Sekip Utara, Yogyakarta 55281, INDONESIA.&lt;/p&gt;
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