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Bioavailability Enhancement of Paclitaxel via a Novel Oral Drug Delivery System: Paclitaxel-Loaded Glycyrrhizic Acid Micelles

Department of Pharmacy, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Derek J. McPhee
Molecules 2015, 20(3), 4337-4356;
Received: 7 November 2014 / Revised: 19 February 2015 / Accepted: 25 February 2015 / Published: 6 March 2015
(This article belongs to the Section Medicinal Chemistry)
Paclitaxel (PTX, taxol), a classical antitumor drug against a wide range of tumors, shows poor oral bioavailability. In order to improve the oral bioavailability of PTX, glycyrrhizic acid (GA) was used as the carrier in this study. This was the first report on the preparation, characterization and the pharmacokinetic study in rats of PTX-loaded GA micelles The PTX-loaded micelles, prepared with ultrasonic dispersion method, displayed small particle sizes and spherical shapes. Differential scanning calorimeter (DSC) thermograms indicated that PTX was entrapped in the GA micelles and existed as an amorphous state. The encapsulation efficiency was about 90%, and the drug loading rate could reach up to 7.90%. PTX-loaded GA micelles displayed a delayed drug release compared to Taxol in the in vitro release experiment. In pharmacokinetic study via oral administration, the area under the plasma concentration-time curve (AUC0→24 h) of PTX-loaded GA micelles was about six times higher than that of Taxol (p < 0.05). The significant oral absorption enhancement of PTX from PTX-loaded GA micelles could be largely due to the increased absorption in jejunum and colon intestine. All these results suggested that GA would be a promising carrier for the oral delivery of PTX. View Full-Text
Keywords: glycyrrhizic acid; micelles; oral bioavailability; paclitaxel glycyrrhizic acid; micelles; oral bioavailability; paclitaxel
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Yang, F.-H.; Zhang, Q.; Liang, Q.-Y.; Wang, S.-Q.; Zhao, B.-X.; Wang, Y.-T.; Cai, Y.; Li, G.-F. Bioavailability Enhancement of Paclitaxel via a Novel Oral Drug Delivery System: Paclitaxel-Loaded Glycyrrhizic Acid Micelles. Molecules 2015, 20, 4337-4356.

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