Effect of pH on the color and UV-Vis absorption spectra of purple sweet potato pigment

BO Ya-li; WANG Xiao-ying; CHEN You-jun

doi:10.13386/j.issn1002-0306.2013.18.046

BO Ya-li, WANG Xiao-ying, CHEN You-jun. Effect of pH on the color and UV-Vis absorption spectra of purple sweet potato pigment[J]. Science and Technology of Food Industry, 2013, (18): 83-86. DOI: 10.13386/j.issn1002-0306.2013.18.046

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Effect of pH on the color and UV-Vis absorption spectra of purple sweet potato pigment

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Within the common food pH range, the effect of pH on the color and UV-Vis absorption spectra of purple sweet potato pigment was investigated.Results showed that purple sweet potato pigment displayed different colors and different UV-Vis absorption spectra at different pH values.Both of them changed remarkably and showed a similar trend.When the pH of purple sweet potato pigment solution increased from 2.0 to 8.0, the color of the pigment solution gradually changed from red to purple, then to blue, and the characteristic absorption peak of 237nm and 530nm moved to the longer wavelength respectively.

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Science and Technology of Food Industry

Effect of pH on the color and UV-Vis absorption spectra of purple sweet potato pigment

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