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Modified-release (MR) dosage forms are designed to extend drug release over time, thereby maintaining stable plasma concentrations and reducing dosing frequency. However, their bioavailability is typically below 100% due to incomplete drug release and presystemic metabolism, and limitations in drug permeability across the gastrointestinal epithelium, all of which can restrict the fraction of the drug reaching systemic circulation. Consequently, studying the in vivo bioavailability of MR...
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Improving a drug's stability in the gastrointestinal (GI) tract is paramount for enhancing its bioavailability and therapeutic effectiveness. Various strategies are employed to protect the drug from the harsh gastric milieu and to ensure its release and absorption at the desired site within the GI tract.Polymer coatings are one such method used to shield drugs from the stomach's acidic environment. By preventing premature drug release, these coatings improve the bioavailability of unstable...
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Polymeric carriers enhance targeted drug delivery by increasing efficacy while minimizing off-target effects. These carriers comprise a biodegradable polymeric backbone integrated with functional elements that enable targeting, improve physicochemical properties, and regulate drug release.Targeting MechanismsThe targeting ability of polymeric carriers is mediated by a homing device, which is a molecular recognition component designed to selectively bind to specific tissues or cells. Monoclonal...
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After oral administration, poor permeability often limits the rate at which drugs are absorbed through the intestinal epithelium. Enhancing drug permeability is crucial for effective therapy, and several strategies have been developed to overcome this challenge.One effective strategy involves the use of lipid-based formulations. These formulations enhance dissolution and solubility, targeting physiological mechanisms to increase drug absorption. This includes stimulating bile salt secretion,...
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Related Experiment Video

Updated: May 4, 2026

Self-Nanoemulsification of Healthy Oils to Enhance the Solubility of Lipophilic Drugs
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Simvastatin Solid Lipid Nanoparticles for Oral Delivery: Formulation Development and In vivo Evaluation.

S G Padhye1, Mangal S Nagarsenker1

  • 1Department of Pharmaceutics, Bombay College of Pharmacy, Santacruz (E), Mumbai-400 098, India.

Indian Journal of Pharmaceutical Sciences
|January 10, 2014
PubMed
Summary

Solid lipid nanoparticles effectively enhanced simvastatin oral bioavailability. Optimized formulations showed high drug entrapment and small particle size, leading to improved cholesterol reduction in vivo.

Keywords:
Bioavailabilityhyperlipidemiasimvastatinsolid lipid nanoparticles

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Area of Science:

  • Pharmaceutical Sciences
  • Nanotechnology
  • Drug Delivery

Background:

  • Solid lipid nanoparticles (SLNs) are a promising strategy for enhancing oral drug bioavailability.
  • Simvastatin, a Biopharmaceutical Class 2 drug, exhibits poor oral bioavailability (5%).

Purpose of the Study:

  • To prepare and optimize simvastatin-loaded solid lipid nanoparticles (SLNs) using hot melt emulsification.
  • To characterize the optimized SLNs for physical stability and in vivo performance.

Main Methods:

  • Simvastatin SLNs were prepared via hot melt emulsification and optimized for lipid/surfactant concentration and drug loading.
  • Characterization included entrapment efficiency, particle size analysis, electron microscopy, X-ray diffraction (XRD), and differential scanning calorimetry (DSC).
  • Dry adsorbed nanoparticles were prepared for improved stability, and pharmacodynamic studies were conducted.

Main Results:

  • Optimized SLNs achieved entrapment efficiencies >96% and particle sizes <200 nm using glyceryl behenate/palmitostearate and Tween 80.
  • Electron microscopy confirmed spherical morphology; XRD and DSC indicated amorphization of simvastatin within the lipid matrix.
  • Dry adsorbed nanoparticles exhibited good flow and reconstitution properties.

Conclusions:

  • Hot melt emulsification is effective for preparing simvastatin SLNs with excellent entrapment and suitable particle size.
  • The amorphized state of simvastatin in SLNs contributes to improved bioavailability, as evidenced by enhanced cholesterol reduction.
  • Developed SLN formulations offer a viable approach to overcome the oral bioavailability challenges of simvastatin.