Journal
ACTA PHARMACEUTICA SINICA B
Volume 11, Issue 9, Pages 2914-2923Publisher
INST MATERIA MEDICA, CHINESE ACAD MEDICAL SCIENCES
DOI: 10.1016/j.apsb.2021.04.018
Keywords
Isosteviol; Cyclodextrin metal-organic framework; Drug loading; Nanoclusters; Solubility; Bioavailability
Categories
Funding
- Na-tional Science Foundation for Young Scientists of China [81803441]
- National Science and Technology Major Projects for the Major New Drugs Innovation and Development (China) [2018ZX09721002-009]
- National Natural Science Foundation of China [81873019]
- University Synergy Innovation Program of Anhui Province [GXXT-2020-025]
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The study found that Cyclodextrin metal-organic framework (CD-MOF) has a promising effect on improving the solubility and bioavailability of isosteviol (STV). The inclusion mechanism plays a primary role when STV loading ratio is low, while the nanocluster mechanism is responsible for the increased bioavailability at high loading ratios.
Cyclodextrin metal-organic framework (CD-MOF) as a highly porous supramolecular carrier could be one of the solutions to the insolubility of isosteviol (STV). The solubility of STV was lower than 20.00 ng/mL at pH 1.0 and pH 4.5, whilst its solubility increased to 20,074.30 ng/mL at pH 6.8 and 129.58 ng/mL in water with a significant pH-dependence. The in vitro release profiles of STV from STV@CD-MOF (0.5:1) were pH-independent in distinct pH media and closed to be thoroughly released but no such release profiles were observed for STV@CD-MOF (1:1) owing to nanoclusters formation. The bioavailability of STV@CD-MOF (1:1) in rats was 8.67-fold higher than that of STV, and was 1.32- and 1.27-fold higher than that of STV@CD and STV@CD-MOF (0.5:1). Our results indicated that the inclusion mechanism played a primary role when STV in CD-MOF was at a low loading ratio, while the increasement in bioavailability at a high loading ratio, which was attributed to the nanocluster mechanism. This was confirmed by molecular simulation. In conclusion, CD-MOF is a promising system for STV loading, overcoming the insolubility and to improve the bioavailability of this natural compound. (C) 2021 Chinese Pharmaceutical Association and Institute of Materia Medica, Chinese Academy of Medical Sciences. Production and hosting by Elsevier B.V.
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