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Updated: Nov 1, 2025

Assembly of Cell Mimicking Supported and Suspended Lipid Bilayer Models for the Study of Molecular Interactions
Published on: August 3, 2021
Combination of Phospholipid Complex and Matrix Dispersion
Ravi Kumar Chakravarti1, Shamandeep Kaur2, Sanjaya K Samal2
1Department of Pharmaceutical Technology (Formulations), National Institute of Pharmaceutical Education and Research, Sector-67, S.A.S Nagar, Punjab, 160062, India.
This study developed simvastatin-phospholipid complex (SIM-PLC)-loaded matrix dispersion (SIM-PLC-MD) to overcome poor drug dissolution. The novel SIM-PLC-MD formulation significantly enhanced simvastatin
Area of Science:
- Pharmaceutical Sciences
- Drug Delivery Systems
- Formulation Development
Background:
- Phospholipid complexation improves drug solubility but can lead to poor dissolution rates due to phospholipid stickiness.
- Simvastatin (SIM) is a lipid-lowering drug with suboptimal dissolution characteristics.
- Developing advanced formulations is crucial to enhance the therapeutic efficacy of poorly soluble drugs like simvastatin.
Purpose of the Study:
- To fabricate simvastatin-phospholipid complex (SIM-PLC)-loaded matrix dispersion (SIM-PLC-MD) using Soluplus®.
- To augment the dispersibility and dissolution of SIM-PLC without compromising the complexation.
- To evaluate the enhanced oral bioavailability and hypolipidemic activity of the developed formulation.
Main Methods:
- Fabrication of SIM-PLC and SIM-PLC-MD using solvent evaporation and discontinuous solvent evaporation techniques.
- Characterization of complexation using FTIR, crystallinity using PXRD and SEM, and colloidal structure using TEM.
- Assessment of hydrophilicity via partition coefficient, solubility, dispersibility, and dissolution studies.
- Pharmacokinetic evaluation in Sprague Dawley rats and efficacy studies for lipid reduction.
Main Results:
- FTIR confirmed successful complexation; PXRD and SEM showed absence of simvastatin crystallinity.
- TEM revealed self-assembly into colloidal structures, indicating good redispersion potential.
- SIM-PLC-MD exhibited significantly increased hydrophilicity, solubility, and dispersibility compared to SIM-PLC and plain SIM.
- Dissolution rates were accelerated by 2.53-fold (pH 1.2) and 1.5-fold (pH 6.8) for SIM-PLC-MD.
- Oral bioavailability of SIM was enhanced 3.19-fold with SIM-PLC-MD versus 1.83-fold with SIM-PLC.
- SIM-PLC-MD significantly reduced triglycerides and cholesterol levels in rats.
Conclusions:
- The matrix dispersion strategy effectively improved the dispersibility and dissolution of simvastatin-phospholipid complexes.
- SIM-PLC-MD formulation demonstrated significantly enhanced oral bioavailability and hypolipidemic efficacy.
- This approach offers a promising strategy for improving the delivery and therapeutic outcomes of poorly soluble drugs.
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