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Journal of Food Quality
Volume 2017 (2017), Article ID 5020742, 8 pages
Research Article

A Study on Organic Tomatoes: Effect of a Biostimulator on Phytochemical and Antioxidant Activities

Tennessee State University, 3500 John A. Merritt Blvd., Nashville, TN 37209, USA

Correspondence should be addressed to Ying Wu

Received 12 July 2017; Revised 28 October 2017; Accepted 7 November 2017; Published 10 December 2017

Academic Editor: Senem Kamiloglu

Copyright © 2017 Varinder Sidhu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The objective of the present study is to investigate nutritional and antioxidant activity of four types of organic tomato cultivars. The differences in tomato quality are also tested between groups with or without treatment using an organic biostimulator, Stimplex. Total phenolic compounds (TPC), lycopene, -carotene, DPPH free radical scavenging activity, reducing power, and color parameters were investigated in the current study. The results showed that there was no significant difference in TPC among cultivars regardless of Stimplex treatment. Higher lycopene and -carotene were obtained in Stimplex treated tomatoes. Lycopene and -carotene contents were significantly different among cultivars (). DPPH scavenging activity in controlled group was significantly higher than that in the Stimplex treated tomatoes (). No significant difference in reducing power was detected among cultivars treatment groups. The study showed that the darker the tomato color, the higher the lycopene and -carotene contents and the stronger the reducing power.