Thermal stability of red pitaya pigment in the milk
Objective To explore the effect of heating treatment with different temperature and time on appearance quality of the system mixed with red pitaya pulp pigment and milk.Methods The system mixed with the pulp pigment and milk was heating treated at 70,80 and 90 ℃ for a period of time,than the content of pulp pigment and the color difference parameters in the mixed system were determined by ultraviolet spectrophotometry and color difference analysis method.Results With the increase of time and temperature during heating treatment,the absorbance value of pulp pigment in the mixed system decreased gradually.Under heat treatment of 30 min,there were significant differences in absorption values of the pulp pigment between 80 ℃ and control group,70 ℃,90 ℃ (P ＜ 0.05).The results of color difference analysis showed that there were significantly differences in treatments with different temperatures,at the same time,the correlation with pulp pigment content of the mixed system was high.Conclusion In the heating treatment with 80 ℃,the pulp pigment maintains its stability when mixed with milk and not affects the color changes of the mixed system.The results can provide scientific references for evaluation of the stability of dairy products which contains pulp pigment of red pitaya.
red pitayamilkpulp pigmentstabilityheating treatment
NETL
NSTL
万方数据
维普
