Abstract
Global tomato production is currently around 180 million tons, of which more than a quarter undergoes processing. The removed peels, seeds, and vascular tissues usually end up in landfills, creating environmental pollution. In order to highlight the alternative use of these vegetal wastes, our study investigated 10 tomato varieties in terms of carotenoids content, phenolic composition, and their related antioxidant and antimicrobial activities. Tomato peels extracts were screened by high performance liquid chromatography with diode-array detection (HPLC/DAD) for qualitative and quantitative analyses. The extracts were tested against six bacterial strains to determine their antimicrobial effect; the 1,1-diphenyl-2-picrylhydrazyl (DPPH) assay was applied to estimate their antioxidant capacity. Total carotenoids content was significantly higher in Ţărănești roz, a local variety (5.31 ± 0.12 mg/100 g DW), while Mirsini, a commercial hybrid, presented significantly higher total phenolic content (155 ± 2 mg/100 g DW) compared to the mean value of all analyzed samples. The methanolic extracts of tomato peels presented acceptable antimicrobial activity against Staphilococcus aureus and Bacillus subtilis, and the mean antioxidant activity was 201 ± 44 µmol Trolox/100 g DW tomato peels. Considering that tomato peels have lycopene, β-carotene, lutein, and different phenolic compounds in their composition, tomato industrial by-products could represent a source of natural bioactive molecules with applicability in nutraceuticals and food industry.
Highlights
Tomatoes (Solanum lycopersicum) are one of the most popular vegetables worldwide with an annual production of approximately 180 million tons above (FAOSTAT, 2017)
In our previous study we investigated the bioactive and antioxidant properties of extracts from several tomato varieties’ processing wastes in order to examine how bioactivity relates to their composition
The aim of the present study is to evaluate the phenolic compounds and carotenoids content of a different fraction, namely tomato peels, of ten tomato varieties processing waste through Ultrasound-assisted extraction (UAE) and to determine the antioxidant and antimicrobial capacities of the extracts
Summary
Tomatoes (Solanum lycopersicum) are one of the most popular vegetables worldwide with an annual production of approximately 180 million tons above (FAOSTAT, 2017). Due to their content in bioactive components, tomatoes and their consumption are linked to important health benefits, like improving heart health and preventing some oxidative stress-related diseases [1]. The main production regions are located in temperate zones; the crop has a seasonal trend, most of the tomatoes being processed between the months of July and December. Tomato processing results in various food products like sauces, canned tomatoes, ketchup or juice. About a quarter of the total tomato production undergoes processing, which means that tomato peels, seeds, and small amounts of pulp
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