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Related Concept Videos

Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism01:21

Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism

658
Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
Some polymorphic crystals possess lower aqueous solubility than their amorphous counterparts, leading to incomplete absorption. For instance, the oral suspension of Chloramphenicol, which...
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Updated: Jan 13, 2026

Injectable Supramolecular Polymer-Nanoparticle Hydrogels for Cell and Drug Delivery Applications
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Zn-IMP 3D Coordination Polymers for Drug Delivery: Crystal Structure and Computational Studies.

Hafiz Zeshan Aqil1, Yanhong Zhu2, Masooma Hyder Khan1

  • 1Key Laboratory of Cluster of Science of Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China.

Polymers
|January 10, 2026
PubMed
Summary

Two novel coordination polymers (CPs) were developed as metal-organic frameworks for hydroxyurea (HU) drug delivery. CP-1 demonstrates superior binding and pH-responsive release for targeted delivery compared to CP-2.

Keywords:
Zn–IMPcoordination polymershydroxyurea bindingpH-dependent molecular dynamicstargeted drug delivery

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Area of Science:

  • Materials Science
  • Medicinal Chemistry
  • Nanotechnology

Background:

  • Coordination polymers (CPs) are increasingly explored for medical applications due to their potential for biosafety and environmental friendliness.
  • Developing novel CPs as drug carriers requires understanding their structural, binding, and release characteristics.

Purpose of the Study:

  • To engineer two novel 3D coordination polymers using zinc-inosine-5'-monophosphate (Zn-IMP) and bpe/azpy linkers as potential drug carriers for hydroxyurea (HU).
  • To evaluate and compare the drug delivery capabilities, binding affinities, and pH-responsive release profiles of the synthesized CPs.

Main Methods:

  • Crystal structure characterization using SCXRD, PXRD, solid-state CD, FTIR, and TGA.
  • Solution phase studies (UV-vis, CD) to analyze mechanistic pathways and chirality.
  • Computational evaluation including molecular docking and multi-pH molecular dynamics (MD) simulations.

Main Results:

  • Synthesized 3D CPs with a P21 space group and chiral distorted tetrahedral geometry.
  • CP-1 exhibited stronger binding affinity (ΔG = -10.87 ± 0.12 kcal·mol⁻¹) for HU than CP-2 (ΔG = -7.59 ± 0.26 kcal·mol⁻¹) at normal and basic pH.
  • CP-1 showed a more compact cavity and significant pH-responsive drug release in acidic conditions, indicating targeted delivery potential.

Conclusions:

  • CP-1 is a promising candidate for targeted hydroxyurea drug delivery due to its strong binding, structural stability, and enhanced pH-responsive release.
  • CP-2 may function as a complementary carrier with weaker binding and faster release properties.