CRYSTALLIZATION OF ICE IN AQUEOUS-SOLUTIONS OF GLYCEROL AND DIMETHYL-SULFOXIDE 2 - ICE CRYSTAL-GROWTH KINETICS

The crystallization of ice in aqueous solutions of glycerol and dimeth yl sulfoxide (Me2SO) has been studied using a combined DSC-video micro scope technique. The solutions investigated were 50w/w% glycerol and 4 5w/w% Me2SO; both of these solutions have a solute concentration of ap proximately 16 mol%. The rates of growth of the external surfaces of i ce crystals from both of these solutions were determined over broad te mperature ranges. The growth rates were found to be generally independ ent of time, particularly at lower temperatures. The ice crystal growt h rate in the glycerol solution became negligible at a significantly h igher temperature than in the Me,SO solution. Addition of anti-freeze protein from the winter flounder at concentrations of 1.7 and 9.9 mg g (-1) was found to have no significant effect on the ice crystal growth rates in 50w/w% glycerol solutions. (C) 1998 Academic Press.