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Development and Validation of HPLC Method for Determination of Quercetin in Hydrogel Transdermal Patches Loaded with Red Onion Peel Extract: doi.org/10.26538/tjnpr/v6i8.8. Trop J Nat Prod Res. 2022;6(8):1210-1214. Accessed January 2, 2026. https://www.tjnpr.org/index.php/home/article/view/1289