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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

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Neutron diffraction and computer simulation studies of D-xylose.

Philip E Mason¹, George W Neilson, John E Enderby

¹Department of Food Science, Stocking Hall, Cornell University, Ithaca, NY 14853, USA.

Journal of the American Chemical Society

|August 4, 2005

Summary

Neutron diffraction with isotopic substitution (NDIS) and molecular dynamics (MD) revealed D-xylose

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Area of Science:

Biophysical Chemistry
Structural Biology
Computational Chemistry

Background:

Understanding the structure of carbohydrates in solution is crucial for biological processes.
D-xylose is a fundamental pentose sugar with implications in various biological systems.
Detailed atomic-level structural information in aqueous solution is often challenging to obtain.

Purpose of the Study:

To investigate the atomic-level structure and hydration of D-xylose in aqueous solution.
To determine the preferred rotameric conformation of hydroxyl groups in D-xylose.
To validate molecular dynamics (MD) simulations against experimental neutron diffraction with isotopic substitution (NDIS) data.

Main Methods:

Neutron diffraction with isotopic substitution (NDIS) experiments were performed on D-xylose solutions.
Specific isotopic labeling of D-xylose with deuterium at the C4 hydrogen position was employed.
Molecular dynamics (MD) simulations were conducted to model the D-xylose-water system.

Main Results:

NDIS experiments provided atomic-level structural insights into D-xylose in solution.
MD simulations showed good agreement with the experimental NDIS data.
The study identified a strongly disfavored trans conformation (180 degrees) for the hydroxyl group at C4, consistent with MD findings.

Conclusions:

NDIS, combined with MD simulations, is a powerful approach for studying carbohydrate structure in solution.
The study successfully determined hydroxyl group conformations of D-xylose, a first for NDIS.
The findings contribute to a deeper understanding of sugar-water interactions and carbohydrate chemistry.