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• W2034997037 abstract "Polyphenol oxidase (PPO) was extracted from five Sicilian varieties of tomato fruit [Pizzutello, Naomi (Hazera), F1 PS212 (Peto seed), Rosa Maletto, and PO228] and assayed with a method using 3-methylbenzothyazolinone hydrazone (MBTH) as chromophore coupling agent. 3,4-Dihydroxyphenylacetic acid was chosen for tomato PPO activity determination. The tomato PPO had maximum activity at pH 4.8. The pH of juice in ripe fruits is between 4.1 and 4.4, a range in which PPO relative activity is between 74 and 87%. The optimum temperature of activity for tomato PPO was 40 °C; the enzyme showed a good relative activity (55% of the maximum) at cold-storage temperature (4 °C). PPO retained 82% relative activity at an NaCl concentration of 0.1 M; at higher concentrations the PPO became gradually inactivated. The commercial variety Naomi is more susceptible to enzymatic browning than the local varieties Pizzutello, Rosa Maletto and PO228, due to higher PPO activity levels. This result confirms the suitability of these local tomato varieties to national markets. Results from storage tests seem to relate PPO activity with color changes associated with browning and lycopene degradation, because lycopene is an antioxidant agent that reconstitutes the polyphenols oxidized by the action of PPO. Keywords: Tomato fruits; polyphenol oxidase; browning; lycopene content" @default.
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• W2034997037 date "2005-02-15" @default.
• W2034997037 modified "2023-09-25" @default.
• W2034997037 title "Characterization of a Tomato Polyphenol Oxidase and Its Role in Browning and Lycopene Content" @default.
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• W2034997037 doi "https://doi.org/10.1021/jf040336i" @default.
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