Densities, viscosities and water activities of ternary NaCl–glucose syrup–water systems from 283.1 to 298.1 K

Abstract

The densities and viscosities of ternary NaCl–glucose syrup–water systems were measured in the 283.1–298.1 K temperature range and the water activities were measured at 298.1 K. NaCl and glucose syrup molalities ranged from 0 to 6.0 mol kg −1 and from 0 to 1.91 mol kg −1, respectively. “Dextrose equivalent” (DE) glucose syrup value was 21 and the median molecular weight was 1.007 (kg mol −1). Experimental density, viscosity and water activity data were fitted by a five-parameter correlation, an eight-parameter polynomial and a five-parameter polynomial correlation, respectively with deviations of less than 0.5%, 2.3% and 0.9%, respectively. The presence of NaCl was found to be responsible for excess volume. There was a major contribution of interaction terms in the calculation of the ternary viscosity, particularly for high viscosity. While these ternary systems are used in the dehydration–impregnation soaking (DIS) process, the technological consequences of the findings were discussed in terms of DIS process optimization, mass transfers, solution management.