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Anthocyanins Lab Report

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Anthocyanins have a positive charge on the molecule that enables to absorb light and thus have colour. Anthocyanidins are anthocyanins without sugar in their structure. They are pelargonidin, cyaniding and delphindin. As pH changes, the colour of anthocyanin also changes. In the acid conditions, the molecules have positive charge on the oxygen atom due to the acidity of the cell in which these compounds are formed. This common form at a pH of 3.0 or less, maintains or shifts the hue towards red. However, as the pH is increased toward a weak acid or even neutral solution, the oxonium which is the positively charged oxygen form is changed to the quinine form. The quinine form has a violet colour. In an alkaline medium still another change takes

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