Abstract
The interaction of aspartame (APM) with selected hydrocolloids was investigated observing solution characteristics and using scanning electron microscopy. The presence of hydrocolloids improved the solubility of APM in the following decreasing order: CMC and acacia gum>κ-carrageenan and pectin>locust bean gum>guar gum>xanthan>amylopectin. Thus, low-viscosity solutions of charged hydrocolloids were the most effective in improving APM solubility. The maximum amount of APM which could be held in solution in the presence of CMC and acacia gum at 5°C was 5.7 and 5.4%, respectively. Scanning electron micrographs revealed co-precipitates of APM with the hydrocolloids and smaller APM crystals than those obtained from the control solution. The mechanism of stabilization of the APM solutions is consistent with a binding of APM to hydrophobic portions of hydrocolloids, which are enhanced at the low pH.
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