Some bioactive extracts have been proven to be effective antioxidants [4]. For example green tea extract has been evaluated as being able to act in the preservative treatment of fresh-cut lettuce. Different quality markers, such as respiration, browning, ascorbic acid, and carotenoid content were evaluated. Several tea extract concentrations (0.25, 0.5, and 1 g/100 mL) at different tempera- tures (20°C and 50°C) were tested. Optimal tea extract treatments (0.25 g/100 mL at 20°C) were compared with chlorine (120 ppm at 20°C). High tea extract concentrations (0.5 g/100 mL and 1.0 g/100 mL) prevented ascorbic acid and carotenoid losses. No significant differences were observed between chlorine and the optimal tea extract concentrations (0.25 g/100 mL at 20°C) in the browning appearance and sensory properties. Tea extract kept the antioxidant activity of the samples better than chlorine did [9].
Some bioactive extracts have been proven to be effective antioxidants [4]. For example green tea extract has been evaluated as being able to act in the preservative treatment of fresh-cut lettuce. Different quality markers, such as respiration, browning, ascorbic acid, and carotenoid content were evaluated. Several tea extract concentrations (0.25, 0.5, and 1 g/100 mL) at different tempera- tures (20°C and 50°C) were tested. Optimal tea extract treatments (0.25 g/100 mL at 20°C) were compared with chlorine (120 ppm at 20°C). High tea extract concentrations (0.5 g/100 mL and 1.0 g/100 mL) prevented ascorbic acid and carotenoid losses. No significant differences were observed between chlorine and the optimal tea extract concentrations (0.25 g/100 mL at 20°C) in the browning appearance and sensory properties. Tea extract kept the antioxidant activity of the samples better than chlorine did [9].
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