Studies of disaccharide solvation-molecular dynamics versus HPLC retention

Molecular dynamics simulations have been used to assess the conformational behaviour of seven disaccharides in aqueous solution. Solvation decreased the overall conformational fluctuations of the sugars, compared to in vacuo simulations using a high dielectric constant. The most significant finding was a linear correlation between the experimental chromatographic retention parameter K' and a molecular modelling parameter based on the next-nearest oxygen - oxygen distances in the disaccharides. The results support previous proposals for a stereospecific hydration model for carbohydrates and demonstrate the utility of a combined experimental/ molecular modelling approach to its study.