Effect of pH on the Lycopene Stability and Its Degradation Kinetics
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Abstract:
Lycopene is susceptible to degradation affected by light, oxygen, heat, solvents and its environment. In order to investigate the effect of solution environment on lycopene stability, the UV-vis spectroscopy character of lycopene with different solvents and its degradation kinetics were analyzed in thiswork. The solvents were including dimethyl sulfoxide (DMSO), tetrahydrofuran (THF) and acetone. The results showed that the characteristic wavelength of lycopene in different solvents appeared the redshift distribution from acetone of 505 nm to DMSO of 511 nm and THF of 523 nm in UV-vis spectroscopy. Lycopene represented as H-type aggregation and observed the blue shift of the maximum of UV absorption peak in water-organic solvent. The experimental results of degradation kinetics showed that the degradation of lycopene in different solvents conformed to first-order reaction law, and it was stable in acetone solvent with a half-life of 25.48 h. The lycopene were stable in acidic and alkane media, but limitedly resistant to strong acid and alkali solution and strong solvent. These results indicated that lycopene was suitable for keeping stability under weak acid and alkane media of acetone and THF aqueous solutions. This study provided a theoretical basis for processing, packaging, and storage of tomato products.
