Abstract
The purpose of this study was to evaluate the antioxidant and antimicrobial properties of extracts of different fractions of two tomato plant cultivars. The stems, roots, leaves, and whole-plant fractions were evaluated. Tomatine and tomatidine were identified by HPLC-DAD. The leaf extracts from the two varieties showed the highest flavonoids, chlorophyll, carotenoids, and total phenolics contents and the highest antioxidant activity determined by DPPH, ABTS, and ORAC. A positive correlation was observed between the antioxidant capacities of the extracts and the total phenolic, flavonoid, and chlorophyll contents. The Pitenza variety extracts inhibited the growth of pathogens such as E. coli O157:H7, Salmonella Typhimurium, Staphylococcus aureus, and Listeria ivanovii, yielding inhibition halos of 8.0 to 12.9 mm in diameter and MIC values of 12.5 to 3.125 mg/mL. These results suggest that tomato plant shows well potential as sources of various bioactive compounds, antioxidants, and antimicrobials.
Highlights
Tomato plants belong to the Solanaceae family and are known as a good source of phenolic compounds, pigments, antioxidants, and other nutrients in the human diet [1]
The leafs of the two varieties of tomato plant evaluated in this study showed the highest contents of tomatine and tomatidine with values of 4.940 and 0.820 and 2.430 and 0.225 mg/ge by Pitenza and Floradade, respectively (Table 1)
We evaluated the presence of glycoalkaloids in the extracts (Table 1), because they could be an indicator of antimicrobial activity
Summary
Tomato plants belong to the Solanaceae family and are known as a good source of phenolic compounds, pigments, antioxidants, and other nutrients in the human diet [1]. The phenolic contents of tomato fruits have been correlated with their antioxidant capacity These compounds prevent oxidative changes in cells by reducing the levels of free radicals [4, 5], and epidemiological reports suggest a direct correlation between the antioxidant capacity of tomatoes and a decreased risk of developing cardiovascular disease and International Journal of Analytical Chemistry cancer [6]. In addition to these properties, tomato byproducts, such as the seeds, represent an attractive source of fiber [7] that shows antimicrobial activities [8]. Tomato plants possess bioactive components with pharmacological and nutritional properties [9]
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