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Colour and stability of pure anthocyanins in¯uenced by pH including the alkaline region

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Academic year: 2019

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Fig. 1. Structures of petanin (top) and cyanidin 3-glucoside (bottom).
Table 2. Visible absorption maxima ( max , nm) and molar absorptivity (", m ÿ 1 cm ÿ 1 ) for 1.03 10 ÿ 4 m petanin and 2.06 10 ÿ 4 m cyanidin 3-glucoside chloride salts 1 h after dissolution in bu€ered solutions (pH 1±9) at room temperature
Fig. 5. UV/Visible spectra of 1.0310 ÿ 4 m petanin as chloride salt taken 1 h after dissolution in bu€ered solutions at pH 1.0
Table 4. Absorbance of petanin and cyanidin 3-glucoside measured at pH 1±9 during 60 days of storage at 23 C in the dark using air atmosphere

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