Changes in Thermal Stability and Degradation Kinetics of Amylose-lycopene Complexes
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Abstract:
To investigate the thermal stability of amylose-lycopene complexes (ALCs), the changes in the lycopene content, retention rate, and antioxidant activity of ALCs were investigated at 50 ℃, 70 ℃, 90 ℃, 110 ℃, and 130 ℃, respectively, with lycopene standard as the control, and the thermal degradation kinetics were further investigated. The results showed that the thermal stability of ALCs was better than that of the control group, and they protected the present lycopene. The contents of lycopene in ALCs with treatment conditions of 50 ℃ (4 h) and 130 ℃ (1 h) were 12.55 μg/mL and 11.06 μg/mL, respectively, which were significantly higher than 10.80 μg/mL and 8.43 μg/mL of lycopene standard (p<0.05). The lycopene retention, and antioxidant activity of ALCs decreased gradually with increasing ambient temperature and treatment duration, although they were significantly better than those of the lycopene standard control. After treatment at 90 ℃ for 10 h, the lycopene retention rate and antioxidant activity of ALCs decreased to 66.59% and 23.83%, respectively, which were significantly better than 44.19% and 4.81% in the control group (p<0.05). Furthermore, the thermal degradation behavior of lycopene in ALCs accorded with the equation 1/Ct-1/C0=kt+b. The degradation rate constant k showed a positive correlation with temperature, while degradation half-life and one-tenth-life showed a negative correlation with temperature. These results suggest that ALCs may effectively protect lycopene with excellent thermal stability. The thermal degradation process of lycopene in ALCs accords with the second-order degradation kinetic model.
