Apparent molar volumes and apparent molar heat capacities of aqueous N-acetyl-D-glucosamine at temperatures from 278.15 K to 368.15 K and of aqueous N-methylacetamide at temperatures from 278.15 K to 393.15 K at the pressure 0.35 MPa

We determined apparent molar volumes V-phi from densities measured with a vibrating-tube densimeter at 278.15 <= (T/K) <= 368.15 and apparent molar heat capacities C-p,C-phi with a twin fixed-cell, differential, temperature-scanning calorimeter at 278.15 <=, (T/K) <= 363.15 for aqueous solutions of N-acetyl-D-glucosamine at in from (0.01 to 1.0) mol center dot kg(-1) and at p = 0.35 MPa, We also determined V-phi at 278.15 <= (T/K) <= 368.15 and C-p,(phi) at 278.15 <= (T/K) <= 393.15 for aqueous solutions of N-methylacetamide at in from (0.015 to 1.0) mol center dot kg(-1) and at p = 0.35 MPa. Empirical functions of in and T for each compound were fitted to our results, which are then compared to those for N,N-dimethylacetamide. Estimated values of Delta V-r(m)(m, T) and Delta C-r(p,m)(m, T) for formation of aqueous N-acetyl-D-glucosamine from aqueous D-glucose and aqueous acetamide are calculated and discussed. (c) 2006 Elsevier Ltd. All rights reserved.