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Summary - The kinetics of 5-hydroxymethylfurfural (HMF) formation upon UHT processing of buffalo milk over a temperature range of 130-145 oC and exposure time of 3.3-22.7 sec was studled using a pilot scale directly heated UHT plant. The formation reaction of total HMF could be - described by a constant z-value of 32.5 oC (010 =2.03). The reaction rate constants for total HMF formation obtained in this study could be expressed by Arrhenius as weil as absolute reaction rate theories. The formation of total HMF had an activation energy of 93.9 kJ/mol. The activation enthalpy (L1W)and free energy of activation (,1G') were 90.5 and 102.9 kJ/mol, respectively, for the temperature range of 130-145 oC. The activation entropy (,1S') was found to be negative and was very small (- 30.2 J/moI.K).

Formation kinetics of total hydroxymethylfurfural during UHT processing of buffalo milk