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Related Concept Videos

Site-Targeted Drug Delivery Systems: Polymeric Carriers01:24

Site-Targeted Drug Delivery Systems: Polymeric Carriers

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...
Modified-Release Drug Delivery Systems: Stimuli-Activated01:30

Modified-Release Drug Delivery Systems: Stimuli-Activated

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 called...
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...
Intrauterine Drug Delivery Systems01:21

Intrauterine Drug Delivery Systems

Controlled-release systems for intravaginal and intrauterine drug delivery have been developed primarily for the administration of contraceptive steroid hormones. These delivery routes circumvent first-pass hepatic metabolism, thereby enhancing bioavailability and allowing for reduced systemic dosages compared to oral administration. Such approaches contribute to improved therapeutic efficacy and patient compliance, particularly in long-term contraceptive regimens.Intravaginal Drug Delivery...
Modified-Release Drug Delivery Systems: Classification01:23

Modified-Release Drug Delivery Systems: Classification

Modified-release drug delivery systems improve drug efficacy and minimize side effects by controlling the rate and location of drug release. These systems fall into three categories: rate-programmed, stimuli-activated, and site-targeted.Rate-programmed systems release drugs at a predetermined rate, maintaining consistent therapeutic levels and reducing fluctuations that could lead to toxicity or subtherapeutic effects. These systems use polymeric matrices, reservoir-based designs, or osmotic...
Modified-Release Drug Delivery Systems: Site-Targeted01:24

Modified-Release Drug Delivery Systems: Site-Targeted

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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Related Experiment Video

Updated: Jun 2, 2026

Synthesis of Aptamer-PEI-g-PEG Modified Gold Nanoparticles Loaded with Doxorubicin for Targeted Drug Delivery
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Synthesis of Aptamer-PEI-g-PEG Modified Gold Nanoparticles Loaded with Doxorubicin for Targeted Drug Delivery

Published on: June 23, 2020

Biodegradable and temperature-responsive polyurethanes for adriamycin delivery.

Xianke Sun1, Hui Gao, Guolin Wu

  • 1School of Chemistry and Chemical Engineering, School of Materials Science and Engineering, Tianjin University of Technology, Binshuixidao 391, Tianjin 300384, China.

International Journal of Pharmaceutics
|April 23, 2011
PubMed
Summary
This summary is machine-generated.

Researchers developed temperature-sensitive biodegradable polymers using poly (ethylene glycol) (PEG) and L-lysine ester diisocyanate (LDI). LDI-PEG600 nanoparticles showed reversible temperature-responsive drug release, crucial for targeted drug delivery systems.

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Magnetic and Thermal-sensitive Poly(N-isopropylacrylamide)-based Microgels for Magnetically Triggered Controlled Release

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Fabricating Superhydrophobic Polymeric Materials for Biomedical Applications
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Fabricating Superhydrophobic Polymeric Materials for Biomedical Applications

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Synthesis of Aptamer-PEI-g-PEG Modified Gold Nanoparticles Loaded with Doxorubicin for Targeted Drug Delivery
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Magnetic and Thermal-sensitive Poly(N-isopropylacrylamide)-based Microgels for Magnetically Triggered Controlled Release

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Fabricating Superhydrophobic Polymeric Materials for Biomedical Applications
09:22

Fabricating Superhydrophobic Polymeric Materials for Biomedical Applications

Published on: August 28, 2015

Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Biomedical Engineering

Background:

  • Biodegradable polymers are essential for drug delivery systems.
  • Developing polymers with controlled release properties is a key challenge.
  • Temperature-sensitive polymers offer unique advantages for targeted therapies.

Purpose of the Study:

  • To synthesize and characterize novel biodegradable, temperature-sensitive polyurethanes.
  • To investigate the self-assembly and solution properties of these polymers.
  • To evaluate the potential of these polymers for controlled drug encapsulation and release.

Main Methods:

  • Synthesis of polyurethanes from poly (ethylene glycol) (PEG) and L-lysine ester diisocyanate (LDI).
  • Characterization using NMR, FT-IR, and GPC.
  • Turbidity and size measurements for solution properties.
  • Adriamycin (ADR) encapsulation and in vitro release studies.

Main Results:

  • Polyurethanes formed nanoparticles in aqueous solutions via sonication.
  • LDI-PEG600 demonstrated reversible temperature-responsive behavior.
  • Drug release rate significantly increased above the polymer's transition temperature (T(c)).
  • Adriamycin encapsulation efficiency was successful.

Conclusions:

  • LDI-PEG600 based polyurethanes are promising candidates for temperature-triggered drug delivery.
  • The tunable transition temperature allows for controlled release profiles.
  • These materials offer a potential platform for advanced biodegradable drug delivery systems.