Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

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...
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: Rate-Programmed I01:22

Modified-Release Drug Delivery Systems: Rate-Programmed I

Rate-programmed drug delivery systems (DDS) are designed to release drugs at specific, controlled rates to maintain consistent therapeutic levels. These systems are categorized based on their release mechanisms, including dissolution-controlled DDS, diffusion-controlled DDS, and combined dissolution-diffusion-controlled DDS.In dissolution-controlled DDS, the release rate depends on the slow dissolution of the drug itself or the surrounding matrix. Drugs with inherently slow dissolution rates,...
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...
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...
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...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Robotic versus Open Pancreatoduodenectomy (PORTAL): multicentre, single masked, phase 3, non-inferiority randomised controlled trial.

BMJ (Clinical research ed.)·2026
Same author

Precise Synthesis of Star-Shaped Redox-Responsive Segmented Polyurethanes with Controlled Arm Sequences for Drug Delivery.

Precision chemistry·2026
Same author

Conformational Transduction Amplification in a Biomimetic Polyelectrolyte for Ultrasensitive Imaging of Iron Metabolism.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)·2026
Same author

Scalable hierarchical textile fibers toward personalized wearable atmospheric water harvesting.

Science advances·2026
Same author

Construction and metabolic efficacy evaluation of sleeve gastrectomy and modified Roux-en-Y gastric bypass in a mouse model with obesity and MASLD.

BMC surgery·2026
Same author

Retraction Note: M3 muscarinic acetylcholine receptors regulate epithelial-mesenchymal transition, perineural invasion, and migration/metastasis in cholangiocarcinoma through the AKT pathway.

Cancer cell international·2026
Same journal

From cyclic diaryl λ<sup>3</sup>-bromanes/chloranes to polyfuntionalized biarylsilanes <i>via</i> aryne σ-bonds.

Chemical science·2026
Same journal

Non-equilibrium formation of the elusive dibridged diboranyl (B<sub>2</sub>H<sub>5</sub>) radical and boranes in low-temperature diborane ices.

Chemical science·2026
Same journal

Visible-light-driven ruthenium-catalyzed hydrogenation of manganese nitride complexes to ammonia under ambient conditions.

Chemical science·2026
Same journal

Quantification of mesopore infiltration in a polymer-grafted metal-organic framework.

Chemical science·2026
Same journal

Enhanced and selective oxygen reduction by iron porphyrin with a biguanide residue in the second coordination sphere.

Chemical science·2026
Same journal

Excited-state orbital angular momentum enables all-optical molecular spin coherence.

Chemical science·2026
See all related articles

Related Experiment Video

Updated: Jun 24, 2026

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by &#960;-&#960; Stacking Interactions
10:53

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions

Published on: October 10, 2016

14.2K

Precisely synthesized segmented polyurethanes toward block sequence-controlled drug delivery.

Yuanqing Song1, Chuandong Sun1, Chenxu Tian1

  • 1College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University Chengdu 610065 China hongtan@scu.edu.cn dmmshx@scu.edu.cn.

Chemical Science
|June 3, 2022
PubMed
Summary
This summary is machine-generated.

Precise synthesis of polyurethanes (PUs) with controlled block sequences was achieved. Sequence order impacts self-assembly, affecting nanocarrier performance in vitro and in vivo for biomedical applications.

More Related Videos

Methionine Functionalized Biocompatible Block Copolymers for Targeted Plasmid DNA Delivery
08:09

Methionine Functionalized Biocompatible Block Copolymers for Targeted Plasmid DNA Delivery

Published on: August 6, 2019

5.9K
Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
11:42

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers

Published on: June 20, 2019

7.9K

Related Experiment Videos

Last Updated: Jun 24, 2026

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by &#960;-&#960; Stacking Interactions
10:53

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions

Published on: October 10, 2016

14.2K
Methionine Functionalized Biocompatible Block Copolymers for Targeted Plasmid DNA Delivery
08:09

Methionine Functionalized Biocompatible Block Copolymers for Targeted Plasmid DNA Delivery

Published on: August 6, 2019

5.9K
Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
11:42

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers

Published on: June 20, 2019

7.9K

Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Biomedical Engineering

Background:

  • Constructing polyurethanes (PUs) with defined block structures is challenging.
  • Precise control over molecular weight and sequence is crucial for advanced material properties.

Purpose of the Study:

  • To develop a precise synthetic method for sequence-controlled polyurethanes (PUs).
  • To investigate the impact of segment sequence order on PU self-assembly and nanocarrier behavior.
  • To evaluate the in vitro and in vivo performance of sequence-controlled PUs.

Main Methods:

  • Liquid-phase synthesis using diisocyanate-based iterative protocols.
  • Convergent strategy for assembling multifunctional PUs.
  • Preparation of PUs with varying cationic and anionic segment sequences.

Main Results:

  • Achieved precise synthesis of PUs with controlled molecular weight and block sequences.
  • Demonstrated that sequence order influences self-assembly and surface charge of micelles.
  • Observed significant effects of sequence on protein absorption, cell uptake, biodistribution, and antitumor activity.

Conclusions:

  • Established a versatile platform for precise multiblock PU synthesis.
  • Highlighted the critical role of sequence order in dictating PU nanocarrier functionality.
  • Paved the way for enhanced clinical translation of advanced polyurethanes in biomedicine.