The densities, rho and speeds of sound, u of D(+)-glucose and D(-)-ribose in water and in (0.10, 0.20, 0.30, and 0.40) mol center dot kg (1) aqueous protic ionic liquid (3-hydroxy propylammonium formate) solutions were measured at temperatures, T = (298.15 to 318.15) K. Infinite dilution standard partial molar volume, V-2(infinity) and standard partial molar isentropic compressibility, K-s,2(infinity) have been calculated, which were used to evaluate the standard transfer volumes, Delta V-t(2)infinity and Delta K-t(s,2)infinity. The Delta V-t(2)infinity and Delta K-t(s,2)infinity values for monosaccharides decrease in the order: D(+)-glucose > D(-)-ribose. The transfer parameters are positive and increase with molalities of ionic liquid (IL) and with temperature. Further, the expansion coefficients, (partial derivative V-2(infinity)/partial derivative T)(P), its derivative (partial derivative V-2(2)infinity/partial derivative T-2)(P), pair (V-AB and K-AB) and triplet (V-ABB and K-ABB) volumetric interaction coefficients and hydration numbers, N-w have also been calculated and used to discuss the solvation behaviour of monosaccharides. The variation in the taste quality of monosaccharides in the presence of IL has also been studied from apparent massic volume, v(phi) and apparent massic isentropic compressibility, K-phi,K-m parameters. (C) 2013 Elsevier Ltd. All rights reserved.