title: Solvents effects on the mechanism of cellulose hydrolysis: A QM/MM study.
abstract: This article reports a combined quantum mechanics/molecular mechanics (QM/MM) investigation on the acid hydrolysis of cellulose in water using two different models, cellobiose and a 40-unit cellulose chain. The explicitly treated solvent molecules strongly influence the conformations, intramolecular hydrogen bonds, and exoanomeric effects in these models. As these features are largely responsible for the barrier to cellulose hydrolysis, the present QM/MM results for the pathways and reaction intermediates in water are expected to be more realistic than those from a former density functional theory (DFT) study with implicit solvent (CPCM). However, in a qualitative sense, there is reasonable agreement between the DFT/CPCM and QM/MM predictions for the reaction mechanism. Differences arise mainly from specific solute-solvent hydrogen bonds that are only captured by QM/MM and not by DFT/CPCM.
authors: Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470, Mülheim an der Ruhr, Germany.
authors: Claudia
authors: C
authors: Loerbroks
authors: Andreas
authors: A
authors: Heimermann
authors: Walter
authors: W
authors: Thiel
mesh_terms: D002236:Carbohydrate Conformation; D002482:Cellulose / Q000737:chemistry*; D006027:Glycosides; D006868:Hydrolysis; D008958:Models, Molecular; D011789:Quantum Theory; D012997:Solvents
chemical_list: D006027:Glycosides; D012997:Solvents; D002482:Cellulose
keywords: cellulose; combined quantum mechanics molecular mechanics method; reaction mechanisms; solvation