Solid dispersion of quercetin-PVP K-30 and its effects on the antioxidant activity
Abstract
Background: Quercetin (3,3’,4’,5,7-pentahydroxil-flavon) is a flavone and secondary metabolite known as flavonoid. Quercetin belongs to class II BCS that has low solubility and high permeability. The poor solubility of quercetin restricts the accessibility and bioavailability. Objectives: To increase the solubility, dissolution, and antioxidant activity in a solid dispersion system. Methods: Preparation of quersetin-PVP K-30 solid dispersion was conducted using the freeze-drying method at -96°C for 24 hours with a ratio of 1:1, 1:0.5, and 0.5:1 and a 1:1 physical mixture of quercetinPVP K-30. The solid dispersion of quercetin-PVP K-30 was characterized by Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD) analysis, and FT-IR spectrophotometric analysis. Solubility test was analyzed using a UV-Vis spectrophotometer, dissolution test was done using a paddle-type dissolution tester, dissolved quercetin concentrations were analyzed using a UV-Vis spectrophotometer, and antioxidant activity was determined using the DPPH method in a UV-Vis spectrophotometer. Results: SEM analysis showed the formation of quercetin-PVP K-30 solid dispersion using the freeze-drying method, and the form changed into anhydrate as seen from the XRD results with the presence of new crystalline peaks in solid dispersion, which were not seen in pure quercetin and PVP K-30. Quercetin-PVP K-30 solid dispersion could increase the solubility by 54-fold at a ratio of 0.5:1 with 94.36%±0.85 quercetin…
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