Title:Formulation, Preparation, and Evaluation of Bifunctional Micelle
with Glycyrrhizic Acid Containing Emodin for Toxicity Attenuation
Application
Volume: 21
Issue: 4
Author(s): Qixiao Wang, Chenlu Gu, Michael Adu-Frimpong, Qiumin Xu, Hao Chi, Xiu Li, Clayton Takura Chingozho, Deerdi Meng, Haizhen Fu, Shanshan Tong*Ximing Xu
Affiliation:
- Department of Pharmacy, Jiangsu University, Zhenjiang, P.R. China
Keywords:
Caco-2 cells, toxicity, intestinal absorption, hydrophobic drug, glycyrrhizic acid, P-glycoprotein.
Abstract:
Objective: To prepare GA-Emo micelles and investigate the feasibility of using GA as both a
bifunctional drug and carrier.
Methods: The preparation of GA-Emo micelles was accomplished via the thin-film dispersion method
with GA as the carrier. Size distribution, entrapment efficiency, and drug loading were used to evaluate
the characteristics of micelles. The absorption and transport properties of the micelles in Caco-2 cells
were investigated, while their pharmacodynamics in mice were preliminarily studied.
Results: The optimal formulation featured a GA/Emo in weight ratio of 2:1 and an encapsulation efficiency
of 23.68%. The optimized GA/Emo was characterized as small uniform spheres with an average
micellar size of 168.64 ± 5.69 nm, a polydispersity index of 0.17 ± 0.01, and an electrically negative
surface (−35.33 ± 0.94 mV). Absorption and transport experiments with Caco-2 cells showed that the
absorption of GA-Emo micelles in small intestines was mainly passive transport, amid their transport
volume being significantly higher than that of Emo monomer. The intestinal wall thickness of the GAEmo
micelles group was significantly lower than that of the Emo group, which meant that the colonic
toxicity of the micelles was lower than unincorporated Emo.
Conclusion: The advantages of GA as a bifunctional micelle carrier in formulation characters, drug
release, and toxicity attenuation provide a new idea for the application of the GA of natural medicine in
drug delivery for toxicity reduction.