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Study on Physiochemical Properties of Pigment from Purple Potato

Likang Qin

Abstract

The physiochemical properties of the pigment from purple potato, an exceptional variation of potato (Solanlum tuberosum L.), were studied. The results indicated that the pigment from purple potato is anthocyanin composition, which has good water-solubility and is stable to heat and metal ions such as Cu2+, Fe2+, Fe3+, Al3+, Mg2+ and Ca2+ in acid environment, but sensitive to light, oxidizer and high concentration reducer in acid environment. The maximum absorption wavelength of this pigment is 528 nm when the pH value is 3. Cu2+ and Fe2+ can enhance colour.

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Key concepts: Pigment, Chemistry, Metal ions in aqueous solution, Solubility, Absorption (acoustics), Anthocyanin, Metal, Composition (language)