<?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%">Norhafizoh Abdul Somat</style></author><author><style face="normal" font="default" size="100%">Zaini Yusoff</style></author><author><style face="normal" font="default" size="100%">Che Puteh Osman</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Chemical Constituents from Diospyros discolor Willd. and their Acetylcholinesterase Inhibitory Activity</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%">Acetylcholinesterase</style></keyword><keyword><style  face="normal" font="default" size="100%">Ebenaceae</style></keyword><keyword><style  face="normal" font="default" size="100%">Flavonoid</style></keyword><keyword><style  face="normal" font="default" size="100%">Triterpenes</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%">November 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%">1547-1551</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;&lt;em&gt;Diospyros discolor&lt;/em&gt; is commonly known as ‘buah mentega’ and traditionally used to treat various diseases. Many compounds especially triterpenes in &lt;em&gt;Diospyros&lt;/em&gt; sp. were reported to inhibit acetylcholinesterase (AChE) and butyrylcholinesterase enzymes &lt;em&gt;in vitro &lt;/em&gt;and &lt;em&gt;in vivo.&lt;/em&gt; &lt;em&gt;D. discolor &lt;/em&gt;was reported to contain triterpenes, yet to be investigated for their AChE inhibitory activity. &lt;em&gt;D. discolor&lt;/em&gt; leaves extract showed high (95.80 ± 1.57 %) AChE inhibitory activity at the concentration of 100 μg/mL. &lt;strong&gt;Objective:&lt;/strong&gt; The aim of the present study is to identify chemical constituents from &lt;em&gt;D. discolor &lt;/em&gt;and their AChE inhibitory activity. &lt;strong&gt;Materials and Methods:&lt;/strong&gt; The leaves and stem barks of &lt;em&gt;D. discolor&lt;/em&gt; were air dried, powdered and successively extracted using n-hexane, dichloromethane and methanol. The solvents were evaporated to obtain dried crude extracts. The compounds were purified using exhaustive chromatographic procedures and their structures were determined by analyses of spectral data. The AChE inhibitory activity was carried out using Ellman’s method. &lt;strong&gt;Results: &lt;/strong&gt;A new flavonol, 7,4’-dihydroxy-5,3’,5’-trimethoxyflavonol &lt;strong&gt;(1)&lt;/strong&gt;, along with five known flavonoids &lt;strong&gt;(2-6)&lt;/strong&gt; and six known triterpenes &lt;strong&gt;(7-13)&lt;/strong&gt; were isolated from the leaves and stem barks of &lt;em&gt;D. discolor. &lt;/em&gt;Selected compounds were evaluated for AChE inhibitory activity, in which stigmast-4-ene- 3-one &lt;strong&gt;(7)&lt;/strong&gt; showed the lowest inhibition concentration with an IC&lt;sub&gt;50 &lt;/sub&gt;value of 11.77 ± 2.11 μM. &lt;strong&gt;Conclusion:&lt;/strong&gt; A new flavonol &lt;strong&gt;(1) &lt;/strong&gt;and twelve known compounds were identified and characterized. Even though &lt;em&gt;D. discolor&lt;/em&gt; extracts showed high percent inhibition against AChE enzyme, the isolated compounds showed moderate inhibition.&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%">1547</style></section><auth-address><style face="normal" font="default" size="100%">&lt;p class=&quot;rtejustify&quot;&gt;&lt;strong&gt;Norhafizoh Abdul Somat&lt;sup&gt;1,2&lt;/sup&gt;, Zaini Yusoff&lt;sup&gt;3&lt;/sup&gt;, Che Puteh Osman&lt;sup&gt;1,2,&lt;/sup&gt;* &lt;/strong&gt;&lt;/p&gt;

&lt;p class=&quot;rtejustify&quot;&gt;&lt;sup&gt;1&lt;/sup&gt;Atta-ur-Rahman Institute for Natural Product Discovery, Universiti Teknologi MARA, Cawangan Selangor, Kampus Puncak Alam, 42300 Bandar Puncak Alam, Selangor, MALAYSIA.&lt;/p&gt;

&lt;p class=&quot;rtejustify&quot;&gt;&lt;sup&gt;2&lt;/sup&gt;Faculty of Applied Sciences, Universiti Teknologi MARA, 40450 Shah Alam, MALAYSIA.&lt;/p&gt;

&lt;p class=&quot;rtejustify&quot;&gt;&lt;sup&gt;3&lt;/sup&gt;Faculty of Applied Sciences, Universiti Teknologi MARA, Cawangan Perlis, Kampus Arau, 02600 Arau, Perlis, MALAYSIA.&lt;/p&gt;
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