NONENZYMIC BROWNING REACTIONS IN MULTI SUGAR AND AMINO-ACID SYSTEMS

Accelerated storage tests were carried out for accumulation of 5-hydro xy methyl furfural (HMF) and brown pigment formation (BPF) in the mode l systems containing more than one sugar and amino acid. In these test s, the effects of temperature and amino acid type were investigated at pH 3.5. In the model systems with glutamine or arginine, the accumula tion of HMF and BPF were higher than the model systems containing prol ine at 55, 65 and 75C. The presence of more than one amino acid in the model caused an additive increase in HMF accumulation and BPF. The ef fect of temperature on both HMF accumulation and BPF were significant (P<0.05). Both HMF accumulation and BPF were affected significantly (P < 0.05) by the addition of amino acid(s) into sugar solution.