Abstract
Tomato is one of the commonly consumed vegetables with high antioxidant capacity. The objective of the present study is to compare the antioxidant property of organic and conventional tomatoes. For the experiment, organic samples were procured from Era Organic Foods, (IMO Certified) Bangalore. Same variety of conventional tomato was obtained from same agro climatic zone. The samples were freeze dried using a lyodryer (LT5BC ISI lyphilization system, USA) and stored at 4 C in dark. The tomato extract was prepared in a solvent consisting of methanol (69%), ethanol (20%), HCl (10%) and water (1%). Total antioxidant capacity was estimated using Free Radical scavenging activity using 2, 2 Diphenyl-1-picryl hydrazyl (DPPH),β Carotene bleaching method, Linoleic acid emulsion system-thiocyanate method and Ferric-reducing antioxidant power(FRAP) methods. The results reveal that organic tomatoes have higher antioxidant ability than conventional tomatoes. These differences are significantly higher in case of DPPH method, β Carotene bleaching method but not significant in case of Linoleic acid emulsion system-thiocyanate method and Ferric- reducing antioxidant power method.
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