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Related Concept Videos

Site-Targeted Drug Delivery Systems: Polymeric Carriers01:24

Site-Targeted Drug Delivery Systems: Polymeric Carriers

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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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Modified-Release Drug Delivery Systems: Site-Targeted01:24

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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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Parenteral Drug Delivery Systems: Injectables, Implants, and Infusion Devices01:28

Parenteral Drug Delivery Systems: Injectables, Implants, and Infusion Devices

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Parenteral drug delivery systems play a crucial role in modern therapeutics by enabling the direct administration of drugs into the systemic circulation, bypassing the gastrointestinal tract. These systems are particularly valuable for poorly absorbed oral medications that are unstable in the digestive environment or require rapid onset or sustained therapeutic levels. Delivery is achieved through intravenous, intramuscular, or subcutaneous routes, each selected based on the drug's properties...
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Drug Distribution: Tissue Binding01:21

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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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Modified-Release Drug Delivery Systems: Rate-Programmed II01:19

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Rate-programmed drug delivery systems release drugs in a controlled manner to maintain therapeutic levels. Three main designs include reservoir, matrix, and hybrid systems.Reservoir systems consist of a drug core enclosed within a membrane that controls drug release. In non-swelling reservoir systems, polymers like ethyl cellulose or polymethacrylates are used. These do not hydrate in aqueous media and control release through membrane thickness, porosity, or insolubility. This type includes...
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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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Related Experiment Video

Updated: Mar 5, 2026

Polyelectrolyte Complex for Heparin Binding Domain Osteogenic Growth Factor Delivery
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Polyelectrolyte Complex Based Interfacial Drug Delivery System with Controlled Loading and Improved Release

David Vehlow1,2, Romy Schmidt3, Annett Gebert4

  • 1Department of Polyelectrolytes and Dispersions, Leibniz Institute of Polymer Research Dresden, Hohe Strasse 6, Dresden D-01069, Germany. vehlow@ipfdd.de.

Nanomaterials (Basel, Switzerland)
|March 28, 2017
PubMed
Summary

This study developed a new polyelectrolyte complex (PEC) coating for drug delivery systems (DDS). The PEC system offers controlled drug loading and release, with enhanced stability and reduced initial drug burst for antibiotics and bisphosphonates.

Keywords:
attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR)biocompatibilitydrug deliveryhMSCpolyelectrolyte complexrifampicinerisedronate

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Area of Science:

  • Biomaterials Science
  • Drug Delivery Systems
  • Polymer Chemistry

Background:

  • Polyelectrolyte complexes (PECs) are promising for drug delivery but often lack controlled loading and exhibit burst release.
  • Existing PEC systems struggle with stability and efficient drug retention.

Purpose of the Study:

  • To develop an improved interfacial drug delivery system (DDS) using polyelectrolyte complex (PEC) coatings.
  • To achieve controlled drug loading and enhanced release performance of antibiotics and bisphosphonates.
  • To evaluate the PEC system's properties on a clinically relevant implant material.

Main Methods:

  • Complexation of poly(l-lysine) (PLL) with a mixture of cellulose sulfates (CS) to form PECs.
  • Integration of rifampicin (RIF) and risedronate (RIS) as model drugs.
  • Characterization of PEC properties including centrifugation, drug loading, release kinetics, and adhesion.
  • Evaluation of PEC biocompatibility and bioactivity on Ti40Nb implant material using human mesenchymal stem cells (hMSC).

Main Results:

  • The developed PEC system demonstrated controlled drug loading and improved release performance.
  • Centrifugation allowed for drug loading assessment, reduced initial burst, and enhanced residual drug amounts.
  • PEC coatings exhibited good adhesion and drug release properties on Ti40Nb implant material.
  • Unloaded PECs supported hMSC proliferation and bone mineral production, while RIS-loaded PECs showed cytotoxicity after 48 hours.

Conclusions:

  • The novel PEC system offers advantages in drug loading, release control, and stability for DDS applications.
  • The PEC system's performance is influenced by pH and ionic strength.
  • While unloaded PECs are biocompatible, drug-loaded PECs require careful toxicity assessment for in vivo applications.