Preparation, characterization, and in vivo evaluation of a self-nanoemulsifying drug delivery system (SNEDDS) loaded with morin-phospholipid complex

Abstract

Background

As a poorly water-soluble drug, the oral application of morin is limited by its low oral bioavailability. In this study, a new self-nanoemulsifying drug delivery system (SNEDDS), based on the phospholipid complex technique, was developed to improve the oral bioavailability of morin.

Methods

Morin-phospholipid complex (MPC) was prepared by a solvent evaporation method and characterized by infrared spectroscopy and X-ray diffraction. After formation of MPC, it was found that the liposolubility of morin was significantly increased, as verified through solubility studies. An orthogonal design was employed to screen the blank SNEDDS, using emulsifying rate and particle size as evaluation indices. Ternary phase diagrams were then constructed to investigate the effects of drug loading on the self-emulsifying performance of the optimized blank SNEDDS. Subsequently, in vivo pharmacokinetic parameters of the morin-phospholipid complex self-nanoemulsifying drug delivery system (MPC-SNEDDS) were investigated in Wistar rats (200 mg/kg of morin by oral administration).

Results

The optimum formulation was composed of Labrafil^® M 1944 CS, Cremophor^® RH 40, and Transcutol^® P (3:5:3, w/w), which gave a mean particle size of approximately 140 nm. Oral delivery of the MPC-SNEDDS exhibited a significantly greater C_max (28.60 μg/mL) than the morin suspension (5.53 μg/mL) or MPC suspension (23.74 μg/mL) (all P < 0.05). T_max was prolonged from 0.48 to 0.77 hours and to 1 hour for MPC and MPC-SNEDDS, respectively. In addition, the relative oral bioavailability of morin formulated in the MPC-SNEDDS was 6.23-fold higher than that of the morin suspension, and was significantly higher than that of the MPC suspension (P < 0.05).

Conclusion

The study demonstrated that a SNEDDS combined with the phospholipid complex technique was a promising strategy to enhance the oral bioavailability of morin.

Keywords:

• morin
• phospholipid complex
• self-nanoemulsifying drug delivery system
• oral bioavailability

Acknowledgments

This work was funded by the National Basic Research Program of China (973 program, No: 2009CB930300) and supported by the National Science and Technology Major Project of China (Grant No: 2009ZX09310-002). The authors would like to thank Rasa Hamilton (H Lee Moffitt Cancer Center, FL) for editorial assistance.

Disclosure

The authors report no conflicts of interest in this work.