Degradation Kinetics of Pigments from Pitaya (Hylocereus polyrhizus) under Different pH Conditions

Abstract

Abstract: The effect of pH 2.0—9.0 on the maximum absorption wavelength of pitaya pigment extract was analyzed. Meanwhile, we studied the degradation kinetics of the pigment extract. It was found that pitaya pigment extract showed maximum absorption at 532, 534, 536, 534, 535, 536, 538 nm and 543 nm, respectively under the conditions of 28 ℃ and pH 2.0—9.0. The degradation of the extract obeyed first-order reaction at specific pH levels. A parabolic relationship between rate constant (k) and pH was found. At pH levels between 4.0 and 6.0, smaller k values were obtained and the extract was stable.

Key words: pitaya (Hylocereus polyrhizus), betanin, degradation, kinetics

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