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

Modified-Release Drug Delivery Systems: Rate-Programmed II

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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Preparation of Thermoresponsive Nanostructured Surfaces for Tissue Engineering
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Preparation of Thermoresponsive Nanostructured Surfaces for Tissue Engineering

Published on: March 1, 2016

Controlling responsive emulsion properties via polymer design.

Robert T Woodward1, Rebecca A Slater, Sean Higgins

  • 1Department of Chemistry, University of Liverpool, Crown Street, Liverpool, UKL69 7ZD.

Chemical Communications (Cambridge, England)
|June 13, 2009
PubMed
Summary
This summary is machine-generated.

Subtle modifications to copolymer surfactant structure and end groups significantly alter the behavior of pH-responsive emulsions. These findings are crucial for developing advanced emulsion technologies.

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Published on: April 16, 2018

Area of Science:

  • Polymer Chemistry
  • Colloid and Surface Science
  • Materials Science

Background:

  • Emulsions are critical in various industries, including pharmaceuticals, food, and cosmetics.
  • Controlling emulsion stability and behavior, particularly in response to environmental stimuli like pH, is a key challenge.
  • Branched copolymers offer unique properties for stabilizing emulsions due to their complex architectures.

Purpose of the Study:

  • To investigate how variations in copolymer surfactant architecture and chain-end functionality affect the behavior of pH-responsive branched copolymer-stabilized emulsions.
  • To elucidate the structure-property relationships governing emulsion performance under changing pH conditions.
  • To provide insights for designing novel emulsion systems with tunable properties.

Main Methods:

  • Synthesis of various branched copolymers with systematically altered architectures and chain-end functionalities.
  • Characterization of copolymer structures using techniques such as Nuclear Magnetic Resonance (NMR) spectroscopy and Gel Permeation Chromatography (GPC).
  • Emulsification of oil-in-water systems using the synthesized copolymers and evaluation of emulsion properties (e.g., droplet size, stability, pH-responsiveness) through dynamic light scattering (DLS) and visual observation.

Main Results:

  • Demonstrated that minor changes in copolymer surfactant architecture, such as branching density and chain length, significantly impact emulsion droplet size and stability.
  • Showcased that specific chain-end functionalities (e.g., charged groups, hydrophobic/hydrophilic moieties) critically influence the pH-responsive behavior, leading to tunable emulsion phase transitions.
  • Observed a direct correlation between the degree of branching and the effectiveness of pH-induced emulsion destabilization or stabilization.

Conclusions:

  • The study confirms that copolymer surfactant design is a powerful tool for controlling emulsion behavior in a pH-dependent manner.
  • Tailoring copolymer architecture and chain-end functionality allows for the precise engineering of pH-responsive emulsions for specific applications.
  • These findings pave the way for the development of smart emulsion systems with on-demand stability control.