Abstract
Dynamic rheological and thermal characteristics of ten Korean acacia honeys with different moisture contents (18.4 to 20.4 percent) were evaluated as a function of moisture content using both a controlled stress rheometer for small-deformation oscillatory measurements and a differential scanning calorimeter (DSC). The honey samples displayed a liquid-like behavior at a subzero temperature (-5°C) with loss modulus (G") predominating over storage modulus (G'), showing a high dependence on frequency. Plots of dynamic moduli (G' and G") and complex viscosity (?*) versus moisture content gave better exponential relationships (R2 = 0.95-0.97) than the tan delta values (R2 = 0.89). Glass transition temperatures at onset (To) showed a better linear relationship (R2 = 0.87) with moisture content compared to those at midpoint (Tm) (R2 = 0.84) and endpoint (Te) (R2 = 0.81). The dynamic rheological parameters more closely correlated with moisture content as compared to the glass transition temperatures, indicating that dynamic rheological measurements at a subzero temperature are better physical parameters to estimate the quality of honeys.
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