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Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
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Magnetic and Thermal-sensitive Poly(N-isopropylacrylamide)-based Microgels for Magnetically Triggered Controlled Release
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Nonpolymeric thermosensitive supramolecules.

José E Betancourt1, José M Rivera

  • 1Department of Chemistry, University of Puerto Rico, Rio Piedras Campus, Rio Piedras, Puerto Rico.

Journal of the American Chemical Society
|November 4, 2009
PubMed
Summary
This summary is machine-generated.

Novel 2'-deoxyguanosine derivatives self-assemble into supramolecular hexadecamers, exhibiting a tunable lower critical solution temperature (LCST) phenomenon. These smart materials form nanoscopic globules above their transition temperature, offering alternatives to traditional polymers.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Biochemistry

Background:

  • Self-assembly of nucleosides into complex structures is crucial for understanding biological processes and developing new materials.
  • The lower critical solution temperature (LCST) phenomenon, where solubility decreases with increasing temperature, is a key characteristic of smart polymers.
  • Developing novel molecules that exhibit controlled self-assembly and thermosensitive behavior is an active area of research.

Purpose of the Study:

  • To synthesize and characterize 2 -deoxyguanosine derivatives capable of self-assembly in aqueous media.
  • To investigate the lower critical solution temperature (LCST) behavior of these derivatives.
  • To explore the potential of these supramolecular assemblies as novel thermosensitive materials.

Main Methods:

  • Synthesis of 2 -deoxyguanosine derivatives.
  • Spectroscopic analysis (e.g., NMR, UV-Vis) to confirm structure and assembly.
  • Calorimetry (e.g., Differential Scanning Calorimetry) to determine transition temperatures.
  • Electron microscopy (e.g., TEM, SEM) to visualize supramolecular structures and morphology.
  • Tuning of transition temperature by modifying molecular structure.

Main Results:

  • 2 -deoxyguanosine derivatives self-assemble into discrete supramolecular hexadecamers in aqueous solution.
  • These hexadecamers exhibit a distinct lower critical solution temperature (LCST) phenomenon.
  • Above the transition temperature (T(t)), supramolecules aggregate into uniform nanoscopic spherical globules.
  • The T(t) can be modulated by altering the hydrophilicity of the derivative, allowing for tunable thermosensitivity.
  • The observed self-assembly and LCST behavior are distinct from traditional polymer systems.

Conclusions:

  • 2 -deoxyguanosine derivatives represent a new class of molecules that form well-defined supramolecular structures with tunable thermosensitivity.
  • These findings introduce a novel paradigm for designing smart thermosensitive materials based on nucleoside self-assembly.
  • The developed materials offer properties complementary to existing polymeric systems, opening avenues for new applications in responsive materials and nanotechnology.