Research Uncovers Insights into Thermodynamics of Mechanically Stretched Oligosaccharides

Strategic Insights -

Researchers from the Birla Institute of Technology and Science have employed steered molecular dynamics (SMD) simulation to study the inherent resistance of oligosaccharides to mechanical stretching. The research, published in the Journal of Chemical Information and Modeling, has provided new insights into the thermodynamics of mechanically stretched oligosaccharides, shedding light on the role of anomeric nature and glycosidic linkages on force-extension curves. By analyzing the behavior of hexameric d-glucopyranosides in aqueous solution, the study found that b-oligos tend to be stiffer than their a-counterparts, with the exception of (1,3)-linked systems.

Key Takeaways:

  • The research employed SMD simulation to study the inherent resistance of oligosaccharides to mechanical stretching.
  • The study found that b-oligos tend to be stiffer than their a-counterparts, with the exception of (1,3)-linked systems.
  • The b-(1,4) and a-(1,3) oligos having relatively straight backbones are stiffest, while curled up a/b-(1,2) and a/b-(1,6) oligos have low elastic modulus.
  • The free-energy change associated with stretching is highest in the b-(1,4) and a-(1,3) systems and least in b-(1,6).
  • Temperature dependence of free-energy changes indicates an increase in entropy as the solvated a-(1,6) and b-(1,4) oligos are stretched in a temperature domain of 280-450 K.
  • Kernel density estimation (KDE) of the angle subtended at the glycosidic link of the oligos under stress brings out the clear contrast in the inherent resistance to stretch.

Statistics:

  • The study involved the analysis of hexameric d-glucopyranosides in aqueous solution.
  • The research found that b-oligos are stiffer than a-oligos in most cases, with the exception of (1,3)-linked systems.
  • The elastic modulus of oligos shows a clear contrast in the inherent resistance to stretch, with broadening of the angle distributions in oligos with curls that recoil during pulling.
  • The study indicates an increase in entropy as the solvated a-(1,6) and b-(1,4) oligos are stretched in a temperature domain of 280-450 K.

Sources:

  • NewsRx. Birla Institute of Technology and Science Reports Findings in Science (Effect of Anomers and Glycosidic Linkages on the Thermodynamics of Mechanically Stretched Oligosaccharides). Physics Week. July 29, 2025; p 14.
  • Effect of Anomers and Glycosidic Linkages on the Thermodynamics of Mechanically Stretched Oligosaccharides. Journal of Chemical Information and Modeling, 2025.
  • Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA (American Chemical Society - www.acs.org; Journal of Chemical Information and Modeling - www.pubs.acs.org/journal/jcisd8)
  • Durba Roy, Dept. of Chemistry, Birla Institute of Technology and Science, Pilani, Hyderabad Campus, Jawahar Nagar, Kapra Mandal, Medchal District, Hyderabad, Telangana 500078, India.