Abstract
This work was carried out to exploit the feasibility of microemulsion combining apigenin/hydroxypropyl-β-cyclodextrin (API/HP-β-CD) complex as the carrier for improving the solubility of API, a bioactive flavonoid with various pharmacological activities. The API/HP-β-CD complex in solid state was prepared by solvent-freeze-drying method and characterized by FT-IR, PXRD and 1H NMR. To further increase the solubility of API, the complex of HP-β-CD with food-grade cosurfactant-free microemulsion was constructed. The aqueous solubility of API significantly increases in the HP-β-CD/Microemulsion complex, via solubilizing dominantly into the “palisade” layer, minor outer phase and inner core. The HP-β-CD modified microemulsion improves the cumulative percentage of API released. Moreover, API loaded in microemulsions with HP-β-CD had a higher antioxidant activity than that without HP-β-CD.
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Support of this work by the National Natural Science Foundation of China (31271933, 31071603) is gratefully acknowledged. The authors also thank Dr. F. Liu for help in UV–Vis spectroscopy analysis.
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Zhao, X., Wang, Z. & Li, X. Preparation, in-vitro release and antioxidant potential of formulation of apigenin with hydroxypropyl-β-cyclodextrin modified microemulsion. J Incl Phenom Macrocycl Chem 86, 93–102 (2016). https://doi.org/10.1007/s10847-016-0644-x
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DOI: https://doi.org/10.1007/s10847-016-0644-x