01968nas a2200217   4500008004100000245016700041210006900208260001900277300001200296490000700308520119800315653002501513653001901538653003201557653002801589100002101617700002501638700002101663700002701684856003901711       2019                        eng d00aEvaluation of Antioxidant Activity and Phytochemical Screening of Leaves, Barks, Stems and Fruits of Alphitonia philippinensis (Rhamnaceae) From Brunei Darussalam0 aEvaluation of Antioxidant Activity and Phytochemical Screening o  cSeptember 2019  a951-9610 v113 a<p class="rtejustify">Phytochemical screening of Alphitonia philippinensis extracts revealed the presence of cardiac glycosides, tannins, saponins and steroids in different plant parts. Total phenolic content (TPC), total flavonoid content (TFC) and total flavonol content (TFlC) were measured using spectrophotometric methods where gallic acid and quercetin were the standards. Antioxidant activity of extracts was assessed using 1,1-diphenyl-2-picrylhydrazyl (DPPH), 2,2̉-azino-bis(3- ethylbenzothiazoline-6-sulfonic acid) (ABTS), free radical scavenging and ferric reducing antioxidant power (FRAP) assays using ascorbic acid and trolox were used as standards. Among the four different crude methanol extracts studies, leaves showed highest antioxidant capacity. EC<sub>50</sub> values of the leaves extract from DPPH and ABTS method found 32 and 45 μg/mL respectively. The higher antioxidant activity of the leaves extract could be correlated with the presence of higher total phenolic content, total flavonoid, and total flavonol contents. According to antioxidant contents and assay results leaves extract possesses highest antioxidant property following fruits, barks and stems.</p>
10aAntioxidant property10aphilippinensis10aPhytochemical investigation10aTotal Phenolic Contents1 aAhmed, Jamiuddin1 aSalim, Kamariah, Abu1 aLim, Linda, B.L.1 aJama, Abdalla, Mohamed  uhttps://www.phcogj.com/article/960