Abstract
ABSTRACTA simple set‐up to measure translational diffusion of components in low moisture systems is described. The tracer technique was tested on the diffusion of 14C‐labeled tripalmitin and palmitic acid in a model system containing paraffin oil, microcrystalline cellulose and gum arabic. Different methods to evaluate the apparent diffusion coefficients from the experimental diffusion curve were compared. Good results were obtained using a curve‐fitting procedure based on the sum of least squares. The technique appears to be suitable for measuring diffusion coefficients up to 10−9 cm2/sec. The procedure offers the possibility to quantify the mobility of chemical components in dried foodstuffs in order to elucidate the mechanisms and kinetics of reactions occurring during storage.
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