Improved Oral Bioavailability Using a Solid Self-Microemulsifying Drug Delivery System Containing a Multicomponent...

Area of Science:

• Pharmacology and Pharmaceutics
• Natural Product Chemistry
• Drug Delivery Systems

Background:

• Salvia miltiorrhiza contains lipophilic and hydrophilic active compounds.
• Low oral bioavailability of these compounds limits therapeutic efficacy.
• A unified drug delivery system is needed to improve absorption.

Purpose of the Study:

• To develop a solid self-microemulsifying drug delivery system (S-SMEDDS).
• To enhance the oral bioavailability of Salvia miltiorrhiza active constituents.
• To evaluate the in vitro and in vivo performance of the S-SMEDDS.

Main Methods:

• Formulation of a prototype SMEDDS using solubility studies and phase diagrams.
• Characterization of SMEDDS properties: self-emulsification, stability, morphology, droplet size, PDI, and zeta potential.
• Preparation of S-SMEDDS via freeze-drying and evaluation of in vitro release and in vivo oral absorption in rats.

Main Results:

• The S-SMEDDS successfully loaded both lipophilic and hydrophilic Salvia constituents.
• In vitro release studies showed 60-80% release of active components within 20 minutes.
• In vivo studies demonstrated significantly improved oral absorption of Salvia constituents compared to a drug suspension.

Conclusions:

• The developed S-SMEDDS effectively increases the dissolution rate and oral bioavailability of Salvia's active components.
• S-SMEDDS represents a promising oral delivery strategy for Salvia extract.
• This approach may be applicable to other multicomponent natural product drugs.