Acid-base stability and degradation kinetics of Amylose-Lycopene Complexes
In order to study the acid-base stability and degradation kinetics of Amylose-Lycopene Complexes(ALCs),the changes in lycopene absorbance in ALCs in different ratios of dimethyl sulfoxide were studied based on UV visible absorption spectroscopy.The effects of different pH values on the color and UV visible absorption spectra of ALCs were analyzed,and their degradation kinetics were studied.The results show that compared with the mixed solvent of dimethyl sulfoxide and water,the characteristic absorption peak of ALCs in dimethyl sulfoxide solvent shows a significant blue shift;ALCs aggregate in an H-shaped manner in a dimethyl sulfoxide aqueous solution system.When the volume ratio of dimethyl sulfoxide to water is 1:1,ALCs exhibit good solubility in acidic and weakly alkaline environments;When the pH of the solution exceeds 12,ALCs exhibit flocculation and sedimentation phenomenon.The degradation of ALCs in dimethyl sulfoxide and dimethyl sulfoxide:water ratio of 1:1 follows second-order reaction kinetics,and the degradation in pH environments of 2,7,and 12 follows zero order reaction kinetics.The half-life of ALCs in different pH environments is 185.54 h(pH=2)>34.45 h(pH=12)>29.50 h(pH=7).The study provides a theoretical basis for the study of stable environments for ALCs.
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