Study on Kinetics of Lipid Oxidation of Whole Milk Powder

[Objective] To study lipid oxidation of whole milk powder under different storage temperature.[Method] The effects of time and temperature on lipid oxidation of whole milk powder were studied with TBA value as evaluation index,and the kinetic analysis of both the extent and the rate of lipid oxidation were respectively investigated.[Result] The results showed that the relationship between lipid oxidation and time can be described by a first order model when storage temperature is from 30 ℃ to 40 ℃,and can be described by both a first order model and a more accurate zero order model when storage temperature is from 50 ℃.The activation energy of lipid oxidation of whole milk powder fit to a first order model is 29.81 kJ/mol.[Conclusion] The rate constant of lipid oxidation with storage temperature from 30 ℃ to 50 ℃ can be calculated by using the kinetic model between lipid oxidation and temperature.