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Related Concept Videos

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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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Site-targeted drug delivery systems enhance therapeutic efficacy while minimizing systemic toxicity and treatment costs. Unlike conventional methods, these systems ensure precise drug delivery, improving bioavailability and reducing side effects. Targeted drug delivery is classified into three levels. First-order targeting directs drugs to the capillary beds of specific organs or tissues. Second-order targets specific cell types, such as tumor cells, using receptor-mediated interactions.
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Upon entering the systemic circulation, drugs can distribute into the interstitial and intracellular fluid of various tissue cells. This distribution is facilitated by the binding of drugs to different cellular components within tissues, which may lead to drug accumulation in specific areas. Drugs bound to tissue components serve as reservoirs that release free drugs back into the system, prolonging the drug's overall action. However, this accumulation can also result in local toxicity.
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Related Experiment Video

Updated: Mar 13, 2026

Encapsulation of Cancer Therapeutic Agent Dacarbazine Using Nanostructured Lipid Carrier
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Drug distribution in nanostructured lipid particles.

Siavash Saeidpour1, Silke B Lohan2, Agnieszka Solik3

  • 1Berlin Joint EPR Lab, Freie Universität Berlin, Fachbereich Physik, Berlin, Germany.

European Journal of Pharmaceutics and Biopharmaceutics : Official Journal of Arbeitsgemeinschaft Fur Pharmazeutische Verfahrenstechnik E.V
|October 30, 2016
PubMed
Summary

Designing effective lipid nanoparticles for drug delivery remains challenging. This study reveals that Dexamethasone primarily binds to the surface of nano-sized lipid particles, enabling easy release.

Keywords:
3-(Carboxy)-2,2,5,5-tetramethyl-1-pyrrolidinyloxy (PubChem CID: 519874)Dermal drug deliveryDexamethasoneDexamethasone (PubChem CID: 5743)Drug delivery systemElectron paramagnetic resonance (EPR) spectroscopyLipidsNanoparticlesPropylene glycol monocaprylate (Capryol® 90) (PubChem CID: 53630264)SpinlabelStearoyl macrogolglycerides (Gelucire® 50/13) (PubChem SID: 135354605)Witepsol (ChemIDplus: 0091744422)

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Area of Science:

  • Materials Science
  • Pharmaceutical Sciences
  • Biophysics

Background:

  • Developing lipid-based nanoparticles for drug delivery requires understanding drug-lipid interactions and localization.
  • Efficient drug loading and controlled release from nanoparticles are critical for therapeutic efficacy.

Purpose of the Study:

  • To investigate the interactions and localization of Dexamethasone within nano-sized lipid particles (NLPs) composed of specific lipids.
  • To characterize the dynamic behavior and microenvironment of Dexamethasone within these NLPs.

Main Methods:

  • Utilized Electron Paramagnetic Resonance (EPR) spectroscopy at various frequencies and temperatures.
  • Employed spin-labeling of Dexamethasone with DxPCA to probe its interactions and mobility.
  • Investigated DxPCA in individual lipid components and within the formulated NLPs.

Main Results:

  • EPR analysis indicated that DxPCA (spin-labeled Dexamethasone) is primarily associated with the surface of the NLPs.
  • Magnetic and dynamic parameters revealed the polarity and mobility of DxPCA within the lipid microenvironment.
  • Dilution experiments demonstrated the potential for easy release of Dexamethasone from the nanoparticles.

Conclusions:

  • Dexamethasone localizes on the surface of the investigated nano-sized lipid particles.
  • The surface localization facilitates straightforward release, which is a key consideration for topical anti-inflammatory drug delivery.