ABSTRACT: The influence of different heat treatments on color and antioxidant properties of tomato purees was investigated. The treatments were designed to produce the same total thermal effect against spoilage microorganisms. Although the development of nonenzymatic browning reactions occurred by increasing process temperature, no changes in redness were observed in the heated samples, due to the “masking” effect of lycopene. Also, the heat treatments had equivalent effect on the chain-breaking activity of the aqueous and lycopene tomato fractions. However the redox potential values increased as the heating temperature increased. All data together showed that the thermal resistance constant z values for color and chain-breaking activity were close to 10°C, but lower than 10°C for reducing properties.
Effect of Equivalent Thermal Treatments on the Color and the Antioxidant Activity of Tomato Purees / M., Anese; Falcone, Pasquale Massimiliano; V., Fogliano; M. C., Nicoli; R., Massini. - In: JOURNAL OF FOOD SCIENCE. - ISSN 0022-1147. - 67:9(2002), pp. 3442-3446. [10.1111/j.1365-2621.2002.tb09603.x]
Effect of Equivalent Thermal Treatments on the Color and the Antioxidant Activity of Tomato Purees
FALCONE, Pasquale Massimiliano;
2002-01-01
Abstract
ABSTRACT: The influence of different heat treatments on color and antioxidant properties of tomato purees was investigated. The treatments were designed to produce the same total thermal effect against spoilage microorganisms. Although the development of nonenzymatic browning reactions occurred by increasing process temperature, no changes in redness were observed in the heated samples, due to the “masking” effect of lycopene. Also, the heat treatments had equivalent effect on the chain-breaking activity of the aqueous and lycopene tomato fractions. However the redox potential values increased as the heating temperature increased. All data together showed that the thermal resistance constant z values for color and chain-breaking activity were close to 10°C, but lower than 10°C for reducing properties.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
