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Related Concept Videos

Pore Transport and Ion-Pair Transport01:17

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Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited  but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
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Drug Delivery Systems: Different Types01:27

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Conventional oral drug products, termed immediate-release (IR) formulations, are engineered to promptly release their active pharmaceutical ingredient (API) upon ingestion, typically in tablets or capsules. This rapid release often results in swift drug absorption and consequent pharmacodynamic effects, although the timing and intensity can vary depending on the drug's properties. Prodrugs within these formulations require metabolic conversion to activate their pharmacodynamic effects,...
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Modified-Release Drug Delivery Systems: Overview01:19

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Modified-release dosage forms are designed to address the limitations of drugs with short biological half-lives. These forms maintain stable therapeutic drug concentrations over extended periods, reducing the need for frequent dosing. A consistent drug level helps minimize peak-trough fluctuations, which can reduce adverse effects, lower the risk of drug resistance, and improve overall treatment effectiveness.One common type of modified-release form is the extended-release (ER) formulation. ER...
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Modified-Release Drug Delivery Systems: Classification01:23

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

Modified-Release Drug Delivery Systems: Site-Targeted

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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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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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Formulation of Diblock Polymeric Nanoparticles through Nanoprecipitation Technique
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Nonequilibrium Solution-Based Assemblies from Bottlebrush Block Copolymers for Drug Delivery.

Jeonghun Lee1, Chiraz Toujani2, Yao Tang3

  • 1School of Materials Science and Engineering, Colorado State University, Fort Collins, Colorado 80523, United States.

ACS Nano
|May 9, 2025
PubMed
Summary

Zwitterionic bottlebrush block copolymers self-assemble into nanoparticles with unique properties. These nonequilibrium nanoparticles offer superior drug loading compared to equilibrium micelles, showing promise for drug delivery platforms.

Keywords:
assembly kineticsbottlebrush copolymerdrug deliverymicellesnanoparticleszwitterionic polymers

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Area of Science:

  • Polymer science
  • Materials science
  • Nanotechnology

Background:

  • Self-assembly kinetics of block copolymers can lead to complex nanostructures.
  • Diblock bottlebrush assembly in solution is not well understood.
  • Zwitterionic polymers offer unique properties for biomedical applications.

Purpose of the Study:

  • Investigate the nonequilibrium self-assembly of nanoparticles from zwitterionic diblock bottlebrushes.
  • Compare nanoparticle structures and properties to equilibrium micelles.
  • Understand the influence of assembly kinetics on nanostructure formation and drug delivery capabilities.

Main Methods:

  • Utilized microscopy and light scattering techniques.
  • Performed molecular simulations for microscopic understanding.
  • Assessed hemocompatibility, colloidal stability, and drug encapsulation efficiency.

Main Results:

  • Nonequilibrium nanoparticles exhibited lower aggregation numbers and frustrated core packing compared to micelles.
  • Nanoparticles showed lower hydrophilic chain density on the surface.
  • Both structures demonstrated excellent hemocompatibility and stability under various conditions.
  • Nanoparticles achieved superior drug loading for a BCS class II drug.

Conclusions:

  • Assembly and stabilization kinetics significantly impact zwitterionic bottlebrush nanostructures.
  • Nonequilibrium nanoparticles present a promising platform for enhanced drug delivery.
  • Further optimization of these systems could lead to advanced therapeutic applications.