New stevia amino acid sweeteners, stevia glycine ethyl ester (ST-GL) and stevia L-alanine methyl ester
(ST-GL), were synthesised and characterised by IR, NMR (1H NMR and 13C NMR) and elemental analysis.
The purity of the new sweeteners was determined by HPLC and their sensory properties were evaluated
relative to sucrose in an aqueous system. Furthermore, the stevia derivatives (ST-GL and ST-AL) were
evaluated for their acute toxicity, melting point, solubility and heat stability. The novel sweeteners were
stable in acidic, neutral or basic aqueous solutions maintained at 100 C for 2 h. The sweetness intensity
rate of the novel sweeteners was higher than sucrose. Stevia amino acid (ST-GL and ST-AL) solutions had
a clean sweetness taste without bitterness when compared to stevioside. The novel sweeteners can be
utilised as non-caloric sweeteners in the production of low-calorie food.
New stevia amino acid sweeteners, stevia glycine ethyl ester (ST-GL) and stevia L-alanine methyl ester(ST-GL), were synthesised and characterised by IR, NMR (1H NMR and 13C NMR) and elemental analysis.The purity of the new sweeteners was determined by HPLC and their sensory properties were evaluatedrelative to sucrose in an aqueous system. Furthermore, the stevia derivatives (ST-GL and ST-AL) wereevaluated for their acute toxicity, melting point, solubility and heat stability. The novel sweeteners werestable in acidic, neutral or basic aqueous solutions maintained at 100 C for 2 h. The sweetness intensityrate of the novel sweeteners was higher than sucrose. Stevia amino acid (ST-GL and ST-AL) solutions hada clean sweetness taste without bitterness when compared to stevioside. The novel sweeteners can beutilised as non-caloric sweeteners in the production of low-calorie food.
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