<?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%">Shalina Sebayang</style></author><author><style face="normal" font="default" size="100%">Raendi Rayendra</style></author><author><style face="normal" font="default" size="100%">Ietje Wientarsih</style></author><author><style face="normal" font="default" size="100%">Bambang Pontjo Priosoeryanto</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Antioxidant Activity and Tyrosinase Inhibition of Avocado (Persea americana Mill.) Leaves and Seeds Extracts</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%">Persea americana Mill; tyrosinase inhibition; DPPH; L-DOPA</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2025</style></year><pub-dates><date><style  face="normal" font="default" size="100%">August 2025</style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">17</style></volume><pages><style face="normal" font="default" size="100%">420-424</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; Ultraviolet radiation (UVR) can stimulate melanin production in the skin, leading to hyperpigmentation. One way to reduce melanin formation is by inhibiting the enzyme tyrosinase. Often discarded as waste, avocado leaves and seeds are rich in flavonoids with potential tyrosinase-inhibiting properties. &lt;strong&gt;Objectives:&lt;/strong&gt; This study aimed to perform phytochemical screening, measure antioxidant and tyrosinase inhibitor activities, and explore the correlation between free radical scavenging and tyrosinase inhibition in ethanol extracts of young avocado leaves (EAL(O)) and old avocado leaves (EAL(Y)), as well as the ethyl acetate extract of avocado seeds (EAS). &lt;strong&gt;Methods:&lt;/strong&gt; Antioxidant activity was assessed using the &lt;em&gt;2,2-Diphennyl-1-picrylhydrazyl &lt;/em&gt;(DPPH) method, while tyrosinase inhibition was evaluated in vitro with mushroom tyrosinase and L-DOPA as a substrate. &lt;strong&gt;Results: &lt;/strong&gt;The results of the antioxidant activity test using the DPPH method yielded IC&lt;sub&gt;50&lt;/sub&gt; values for EAL(Y), EAL(O), and EAS of 17.9±0.15 μg/mL, 15.33±0.02 μg/ mL, and 745.66±6.08 μg/mL, respectively. Tyrosinase inhibition tests indicated that EAL(Y), EAL(O), and EAS could significantly inhibit tyrosinase activity (&lt;em&gt;P &lt;/em&gt;&amp;lt;0.01), with IC&lt;sub&gt;50&lt;/sub&gt; values of 10133.26±140.12 μg/mL, 8496.20±155.06 μg/mL, and 48375.8±553.06 μg/mL, respectively. The correlation coefficients between tyrosinase inhibition and antioxidant activity for EAL(Y), EAL(O), and EAS were r = 0.955, r = 0.947, and r = 0.991, respectively. &lt;strong&gt;Conclusion: &lt;/strong&gt;These findings suggest that EAL(Y), EAL(O), and EAS may be potential natural skin-whitening agents due to their flavonoid content and antioxidant and anti-tyrosinase properties.&lt;/p&gt;
</style></abstract><issue><style face="normal" font="default" size="100%">4</style></issue><work-type><style face="normal" font="default" size="100%">Original Article</style></work-type><section><style face="normal" font="default" size="100%">420</style></section><auth-address><style face="normal" font="default" size="100%">&lt;p class=&quot;rtejustify&quot;&gt;&lt;strong&gt;Shalina Sebayang&lt;sup&gt;1*&lt;/sup&gt;, Raendi Rayendra&lt;sup&gt;2&lt;/sup&gt;, Ietje Wientarsih&lt;sup&gt;3&lt;/sup&gt;, Bambang Pontjo Priosoeryanto&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;Doctoral Program of Animal Biomedical Sciences Graduate School of IPB University, Bogor, INDONESIA&lt;/p&gt;

&lt;p class=&quot;rtejustify&quot;&gt;&lt;sup&gt;2&lt;/sup&gt;Faculty of Medicine, Syarif Hidayatullah Islamic University, Jakarta, INDONESIA&lt;/p&gt;

&lt;p class=&quot;rtejustify&quot;&gt;&lt;sup&gt;3&lt;/sup&gt;Division of Veterinary Pathology, School of Veterinary Medicine and Biomedical Sciences of IPB University, Bogor, INDONESIA&lt;/p&gt;
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