Abstract
In this paper, the stability of anthocyanins in morning glory in the presence of different ions was analyzed by spectrophotometry. The anthocyanin extract was obtained by heating and reflux. Then the maximum absorption wavelength of anthocyanin was obtained by specific characteristic absorbance of anthocyanin, and the concentration of anthocyanin was calculated. Six different metal ions were added to the anthocyanin solution to determine the influence of the stability of anthocyanin by measuring the absorbance value. Through the analysis, we obtained calcium ions which can promote the stability of anthocyanins. Finally, we find the best concentration ratio of calcium ion and anthocyanin. Through the study, we found that when the concentration of anthocyanin and calcium ion is 1:7, the best color retention effect is achieved.
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