The effects of direct-electric-current (DC) on secondary plant compounds and antioxidant activity in harvested
tomato fruits were investigated. A new technology was developed to supply DC to the tomatoes.
Different intensities of DC (100–500 mA) with varied application times (15–60 min) were applied during
postharvest. Almost all DC treatments significantly affected the secondary metabolism, resulting in an
accumulation of carotenoids, phenolic compounds, and antioxidant activity in tomatoes. In the present
study, optimal DC treatments were found in order to obtain the highest content of all investigated secondary
plant compounds. After an adaptation time (AT) of 2 h, the maximum contents of lycopene
(122.4%), ß-carotene (140.4%), total phenol (120.0%), and antioxidant activity (126.5%) were attained with
a DC treatment of 500 mA for 15 min. The results changed after an adaptation time of 24 h (AT 24 h),
where the highest contents of lycopene (128.7%), ß-carotene (129.6%), total phenol (113.6%), and antioxidant
activity (120.9%) were obtained using the same DC treatment (500 mA), but with an application
time of 30 min. Therefore, the application of DC in harvested tomato fruits may be appropriate to improve
the health-promoting properties of tomatoes.
2010 Elsevier Ltd. All rights reserved.
The effects of direct-electric-current (DC) on secondary plant compounds and antioxidant activity in harvestedtomato fruits were investigated. A new technology was developed to supply DC to the tomatoes.Different intensities of DC (100–500 mA) with varied application times (15–60 min) were applied duringpostharvest. Almost all DC treatments significantly affected the secondary metabolism, resulting in anaccumulation of carotenoids, phenolic compounds, and antioxidant activity in tomatoes. In the presentstudy, optimal DC treatments were found in order to obtain the highest content of all investigated secondaryplant compounds. After an adaptation time (AT) of 2 h, the maximum contents of lycopene(122.4%), ß-carotene (140.4%), total phenol (120.0%), and antioxidant activity (126.5%) were attained witha DC treatment of 500 mA for 15 min. The results changed after an adaptation time of 24 h (AT 24 h),where the highest contents of lycopene (128.7%), ß-carotene (129.6%), total phenol (113.6%), and antioxidantactivity (120.9%) were obtained using the same DC treatment (500 mA), but with an applicationtime of 30 min. Therefore, the application of DC in harvested tomato fruits may be appropriate to improvethe health-promoting properties of tomatoes. 2010 Elsevier Ltd. All rights reserved.
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