Effects of 63DE (dextrose equivalent) commercial corn syrup on the state behavior and crystal growth
rate of sucrose and corn syrup mixtures in thin films (1.08 mm) were investigated using DSC and polarized
light microscopy. Glass transition temperature (Tg) and solubility temperature increased significantly
as moisture content decreased from 16.75% to 3.75%. Additionally, higher levels of corn syrup
depressed solubility temperature but at the levels studied, showed no apparent effect on Tg.
Addition of corn syrup significantly decreased sucrose crystal growth rate. For systems containing 14%
and 30% corn syrup, growth rates measured between 40 and 120 C ranged from 5.6 to 3400 lm2/min
and 1.8 to 470 lm2/min, respectively. Growth rate dispersion (GRD) was observed for all conditions
and the extent of the GRD increased with increasing growth rate. By overlaying crystallization rate zones
on the state diagram, the competing effects of supersaturation driving force and molecular mobility
inhibition on sucrose crystal growth rates were clearly observed.
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