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The aim of this study was to develop a suitable drug-in-adhesive patch for transdermal delivery of koumine. Acrylic polymer Duro-Tak® 87-4287, which contains hydroxyl groups, may significantly enhance the skin permeation of koumine from transdermal patches containing 0.93-3.72% koumine. Among permeation enhancers, 10% azone showed the greatest potential and increased the flux of koumine to 1.48-fold that of the control. Therefore, an optimized patch formulation containing 3.72% koumine and 10% azone in Duro-Tak® 87-4287 that offers good physical pr

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A good linear relation was observed within 0.00 to 7.89% of naringenin relative mass with an R2 of 0.973. The accuracy was determined by the spike and recovery method. The results showed an average 104% recovery. The limit of detection and limit of quantification of the drug loading content were determined to be 0.3 and 1.0%, respectively. The method's robustness is demonstrated by the notable similarities between the calibrations carried out using two different equipment setups at two different institutions.Essential oils (EOs) are kno