直链淀粉-番茄红素复合物的氧稳定性及降解动力学研究
Oxygen stability and degradation kinetics of amylose-lycopene complexes
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摘要:以直链淀粉-番茄红素复合物(ALCs)为研究对象,对其结构进行表征,研究了N 2和O 2处理条件下ALCs中番茄红素保留率和抗氧化活性的变化,并进一步构建番茄红素降解动力学模型。结果表明:直链淀粉包合番茄红素形成了V-型单螺旋结构,且番茄红素与直链淀粉发生的分子链缠绕使ALCs的双螺旋含量增加;N 2处理条件下,ALCs中番茄红素的质量浓度和抗氧化活性高于O 2处理条件,且降解较缓慢;N 2环境下处理24 h后,ALCs中番茄红素保留率和DPPH清除率分别为(85.17±0.42)%和(35.74±0.01)%,均显著高于对照组的(59.74±0.06)%和(17.20±0.01)%;O 2环境下处理24 h后,ALCs中番茄红素保留率和DPPH清除率分别为(77.09±0.90)%和(33.24±0.03)%,均显著高于对照组的(50.32±0.42)%和(16.32±0.09)%;N 2和O 2处理条件下,ALCs中番茄红素的降解均符合二级动力学模型,降解速率常数分别为6.0×10 -4μg/(mL·h)和8.0×10 -4μg/(mL·h),其半衰期( T 1/2)分别为115.92 h和86.94 h、十分之一衰期( T 9/10)分别为17.57 h和13.18 h,均显著优于对照组。因此,ALCs具有良好的氧稳定性,可较好保持番茄红素质量浓度和抗氧化活性,对番茄红素具有有效的保护作用。
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关键词:
- 直链淀粉-番茄红素复合物/
- 氧稳定性/
- 降解动力学/
- 结构表征
Abstract:The structure of amylose-lycopene complexes (ALCs) was characterized, and the changes of lycopene retention and antioxidant activity in ALCs treated with N 2or O 2were studied, and the kinetic model of lycopene degradation was further developed. Results showed that lycopene encapsulated by amylose formed a V-type helix structure, and the molecular chain winding of lycopene and amylose increased the double helix content of ALCs. The content and antioxidant activity of lycopene in ALCs treated with N 2were higher than those treated with O 2, and the degradation was slower. After 24 h treatment in N 2, the retention rate of lycopene and the clearance rate of DPPH in ALCs were (85.17±0.42)% and (35.74±0.01)%, respectively, which were significantly higher than those in the control group (59.74±0.06)% and (17.20±0.01)% ( P< 0.01). After 24 h treatment in O 2, the retention rate of lycopene and the clearance rate of DPPH in ALCs were (77.09±0.90)% and (33.24±0.03)%, respectively, which were significantly higher than those of lycopene standard (50.32±0.42)% and (16.32±0.09)% in the control group. Under the condition of N 2and O 2treatment, the degradation of lycopene in ALCs conformed to the second-order kinetic model, the degradation rate constants were 6.0×10 -4μg/(mL·h) and 8.0×10 -4μg/(mL·h), respectively, and the lifetimes of T 1/2was 115.92 h and 86.94 h, respectively, and the T 9/10was 17.57 h and 13.18 h, respectively, which were significantly better than those in the control group. Therefore, the ALCs was effective in enhance lycopene stability, and better maintained the content and antioxidant activity of the lycopene. -
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