玉米黄色素的热稳定性和降解动力学研究

The stability and thermal degradation kinetics of corn yellow pigment

为了探明玉米黄色素的热降解规律,从降解动力学角度研究了不同加热条件下玉米黄色素的热稳定性。在不同加热温度(50、60、70、80、90℃)下以及不同微波条件(150、300、450、600、750 W)下研究玉米黄色素的降解率和热降解动力学,并给出了玉米黄色素的热降解半衰期和活化能。结果表明:玉米黄色素在不同温度和微波条件下均发生不同程度的降解,并且热降解动力学符合零级动力学反应,在温度(50~90)℃范围内,玉米黄色素的半衰期t1/2分别为232.60、88.30、55.01、33.51 min和21.26 min,活化能Ea为56.995 k J/mol,同时得出了色素降解的速度常数和温度关系的定量方程。从而为玉米黄色素的开发和应用提供了研究基础。

In order to clarify the thermal degradation law of corn yellow pigment, the pigment thermo stability was studied by the way of degradation kinetics. The degration rate and thermal degradation kinetics were studied in the condition of heating conditions （50, 60, 70, 80, 90 ℃） and microwave conditions （150, 300, 450, 600, 750 W）, and the half-life and activation energy of corn yellow pigment were given. The results showed that the pigment thermal degraded in different degrees due to heating and microwave treatment, which was consistent with the zero-order thermal degradation kinetics. The calculated values of half-lives t1/2 were 232.60, 88.30, 55.01, 33.51 min and 21.26 min, and the activation energies（Ea） were 56.995 kJ/mol. Moreover, the standing equation for effect of the temperature on the degradation rate of the pigment was obtained. All ablove this provided scientific evidence for exploiting and utilizing of corn yellow pigment.