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A Preliminary Comparison of Antioxidants of Tomato Fruit Grown Under Organic and Conventional Systems

Division of Postharvest Technology, King Mongkut’s University of Technology Thonburi, Bangkok 10150, Thailand
Lake Rajada Office, Adams Enterprises Ltd., Bangkok 10110, Thailand
Author to whom correspondence should be addressed.
Academic Editors: Varit Srilaong, Mantana Buanong, Chalermchai Wongs-Aree, Sirichai Kanlayanarat and Douglas D. Archbold
Horticulturae 2017, 3(1), 21;
Received: 7 December 2015 / Revised: 30 August 2016 / Accepted: 9 September 2016 / Published: 30 December 2016
(This article belongs to the Special Issue Quality Management of Organic Horticultural Produce)
Organic farming is rapidly growing due to its perceived potential for producing higher nutritional quality. However, studies of organically- and conventionally-grown crops have not always shown differences between the systems. The objective of this research was to compare the antioxidant activities of organically-grown tomato to those from a conventional production system during postharvest cold storage. “Tub Tim Dang” tomato (Solanum lycopersicum L.) fruit were harvested at the breaker stage of maturity from both organic and conventional farms. Fruit were cold-stored at 10 °C for 20 days, and samples were collected at intervals to measure the activities of superoxide dismutase (SOD), catalase (CAT) and ascorbate peroxidase (APX) activities, and total antioxidant activity by the 2,2′-diphenyl-1-picrylhydrazyl (DPPH) and ferric reducing antioxidant power (FRAP) assays. The activities of SOD, CAT and APX of organic tomato fruit did not differ from those of conventional fruit during cold storage. In addition, there was no effect of production system on FRAP activity. In contrast, DPPH activity of organic tomato fruit was lower than conventional fruit through 10 days of cold storage, but it was higher at 15 and 20 days. These results indicated that organic production did not have a significant effects on these antioxidant traits of tomato. View Full-Text
Keywords: tomato; antioxidant enzyme; DPPH; FRAP tomato; antioxidant enzyme; DPPH; FRAP
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Uthairatanakij, A.; Aiamla-or, S.; Jitareerat, P.; Maneenoi, A. A Preliminary Comparison of Antioxidants of Tomato Fruit Grown Under Organic and Conventional Systems. Horticulturae 2017, 3, 21.

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