Bioactive Compounds, Antioxidant Activity and Color of Hydroponic Tomato Fruits at Different Stages of Ripening

Abstract

This experiment was carried out in order to study the simultaneous effect of on-vine ripening and examined cultivars on fruit quality, color development and antioxidant content in two different types of tomatoes. 'Admiro' and 'Komet' (normal average fruit weight) and 'Cheramy' (cherry type) cultivars grown in hydroponic culture were used. Dry matter, soluble solids, titratable acidity, ascorbic acid, lycopene, β-carotene, total phenolic, total flavonoid content and hydrophilic antioxidant activity were measured in six ripening stages. Color of fruits was determined by CIELab system. The L*, a*, b* values were used to calculate hue angle (h o ), chroma (C*) and a* to b* ratio. In all analysed cultivars total phenolic content increased as ripening progressed, reached the maximum at the pink stage and subsequently declined, while the trend of ascorbic acid was cultivar dependent. DPPH radical scavenging activity showed significant moderately strong positive correlations with total phenolics and ascorbic acid. The content of β-carotene increased constantly during ripening while lycopene content registered a sharp rise, especially in the last stage of ripening when 47.2% of the lycopene content was accumulated. During ripening the lightness (L*) decreased because tomato fruit colour became darker while the ratio of red to green colour increased as a result of carotenoids synthesis. Among color indexes, hue angle (h o

Quality Parameters of Juice Obtained from Hydroponically Grown Tomato Processed with High Hydrostatic Pressure or Heat Pasteurization

“…As noted by these authors, the TPC found in commercially available tomato juices ranged from approximately 2.0 to 9.4 mg GAE/g dm. On the other hand, the concentration of polyphenols in the fresh, untreated juice was almost 30% and 40% higher than that found in hydroponically grown tomatoes [ 24 , 25 ]. However, as demonstrated in the literature, the plant genotype and growth conditions are key determinants of the nutritional quality of the obtained product [ 26 ].…”

Changes in Vegetative and Reproductive Growth and Quality Parameters of Strawberry (Fragaria × ananassa Duch.) cv. Chandler Grown at Different Substrates

“…Total carotenoids are one of the most important antioxidants found in strawberries. It is reported that increase in total carotenoids is enhanced with the process of photosynthesis [35]. e process of photosynthesis occurs mainly due to the presence of chlorophyll, and it has been reported that chlorophyll and carotenoids are positively correlated with each other.…”

Composition, polyphenol bioavailability, and health benefits of aronia berry: a review

“…Aronia berry has a significantly higher polyphenol and antioxidant content than most fruits and vegetables (Nour et al, 2015;Jakobek and Seruga, 2012;Pérez-Jiménez, 2010). Aronia berry total polyphenols range from 1.0 to 3.6 g/100 g fwb (Denev et al, 2018;Nour et al, 2015). The primary polyphenols in aronia berries include anthocyanins, proanthocyanidins, flavonols, and phenolic acids.…”