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Stimuli-activated drug delivery systems are designed to release drugs in response to specific physical, chemical, or biological stimuli. These systems often utilize hydrogels—three-dimensional, hydrophilic polymer networks capable of swelling in aqueous environments and retaining significant fluid volumes. Upon exposure to particular stimuli, these hydrogels undergo structural transitions that allow the embedded drug to be released. Due to this adaptive behavior, such systems are also...
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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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Continuous-release drug delivery systems offer a strategic approach to maintaining therapeutic drug levels over extended periods following oral administration. By modulating the release rate of active pharmaceutical ingredients, these systems minimize fluctuations in plasma concentrations, which enhances clinical efficacy and reduces the need for frequent dosing. Such characteristics make them particularly advantageous in managing chronic diseases where patient adherence and stable drug...
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Drug Delivery Systems Based on Hydroxyethyl Starch.

Constantinos M Paleos1,2, Zili Sideratou1, Dimitris Tsiourvas1

  • 1NCSR "Demokritos", Institute of Nanoscience and Nanotechnology , 15310 Aghia Paraskevi, Attiki Greece.

Bioconjugate Chemistry
|April 22, 2017
PubMed
Summary
This summary is machine-generated.

Hydroxyethyl starch (HES) is a promising polysaccharide for developing novel drug delivery systems (DDSs). HES-based conjugates, nanocapsules, and hydrogels show extended plasma half-life and promising efficacy, suggesting future clinical applications.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Hydroxyethyl starch (HES) possesses advantageous biological properties.
  • Polysaccharides are increasingly explored for drug delivery systems (DDSs).
  • There is a need for novel DDSs with enhanced efficacy and plasma half-life.

Purpose of the Study:

  • To design and synthesize novel drug delivery systems (DDSs) using hydroxyethyl starch (HES).
  • To evaluate the efficacy and pharmacokinetic properties of HES-based DDSs.
  • To explore the potential clinical applications of HES-based drug delivery formulations.

Main Methods:

  • Synthesis of HES conjugates with anticancer molecules and therapeutic proteins.
  • Preparation and characterization of HES-based nanocapsules and hydrogels.
  • In vitro and in vivo evaluation of drug delivery system performance, including plasma half-life extension.

Main Results:

  • HES conjugates, nanocapsules, and hydrogels were successfully synthesized.
  • These HES-based formulations demonstrated extended plasma half-life.
  • In vitro and in vivo studies showed promising results for HES-based DDSs.

Conclusions:

  • HES is a versatile polysaccharide for constructing effective drug delivery systems.
  • HES-based DDSs offer enhanced efficacy and pharmacokinetic profiles.
  • Further research and multifunctionalization of HES systems may lead to clinical applications.