Reaction orders, rate constants and actvation energies were evaluated for 5-hydroxymethyl methyl furfural (HMF) accumulation and brown pigment formation (BPF) in pekmez and its model systems stored at 55, 65, an 75 deg C over 10 days at pH 4.0. The model systems and their compositions were decided by considering the major pekmez components. Accumulation of HMF and BPF were the highest in pekmez and they were the smallest in model. ANOVA showed that the effects of temperature on both accumulation of HMF and BPF were significant (p<0.05).
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