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Effects of hot‐water and steam blanching of sliced potato on polyphenol oxidase activity

2018; Wiley; Volume: 54; Issue: 2 Linguagem: Inglês

10.1111/ijfs.13951

1365-2621

Roberto Moscetti, Flavio Raponi, Danilo Monarca, Giacomo Bedini, Serena Ferri, Riccardo Massantini,

Phytochemicals and Antioxidant Activities

Summary The worldwide potato production is considered the fourth‐most important food sector due to the increasing use of potatoes as raw materials for high‐convenience food. Enzymatic browning, due to polyphenol oxidase ( PPO ), is related to unacceptability by consumer. Among antibrowning agents, thermal treatments are viable alternatives. In this study, the efficacy of hot‐water and steam blanching at 80–90 °C of potato slices (1‐cm thick) was evaluated in terms of colour changes as well as PPO inactivation kinetics, substrate specificity and transition state parameters. In general, all treatments [1] bleached the slices, [2] inactivated PPO and [3] reduced its kinetic efficiency. Results from thermal inactivation kinetics promoted hot‐water blanching at 90 °C for approx. 2 min as the fastest treatment to obtain enzymatic‐stable potato slices. Moreover, steam blanching required more energy (53.93 ± 1.24 kJ mol −1 ) than hot‐water treatment (41.41 ± 4.51 kJ mol −1 ) to reach the transition state and then to unfold the PPO enzyme.