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        Degradation Kinetics of Anthocyanins from Purple Sweet Potato (Ipomoea batatas L.) as Affected by Ascorbic Acid

        Jing Li,Huige Song,Nan Dong,Guohua Zhao 한국식품과학회 2014 Food Science and Biotechnology Vol.23 No.1

        Storage (4oC and 25oC, 28 days) and thermal(70oC-90oC, 6 h) stabilities of purple sweet potatoanthocyanins (PSPAs) with varying concentrations ofascorbic acid (AA) were investigated in a model soft drinkmedium. For storage stability, the model drink wassterilized at 85oC for 15 min prior to storage. Zero-orderkinetics and first-order kinetics were fitted for storagedegradation at 4oC and 25oC, respectively. However, alldata for thermal degradation fitted first-order kinetics. Thetemperature dependence on degradation was modeled afterthe Arrhenius equation. Storage degradation of PSPAs wasincreased by the presence of AA (40-360 mg/L). Retardedthermal degradation was be achieved by adding 120 mg/Lof AA, while accelerated thermal degradation resultedfrom 360 mg/L of AA. Heat treatment did not markedlychange the DPPH radical-scavenging activity of PSPAs.

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