Atividade antioxidante e teor de fenólicos em couve-manteiga (brassica oleracea l. var. acephala) submetida a diferentes sistemas de cultivo e métodos de preparo

Abstract

Atividade antioxidante e teor de fenólicos em couve-manteiga (brassica oleracea l. var. acephala) submetida a diferentes sistemas de cultivo e métodos de preparo Conclui-se que a combinação de sistema de cultivo orgânico e cocção em calor seco pode ser eficiente para preservação e ou aumento do teor de compostos fenólicos e da atividade antioxidante em talos e, principalmente, em folhas de couve. ARTIGOS / ARTICLES CIÊNCIAS BIOLÓGICAS E DA SAÚDEPalavras chave: Alimento funcional. Compostos fenólicos. Cromatografia.The study evaluated the influence of cropping systems and methods of preparation on the antioxidant activity and phenolic content in kale leaf and stalks (Brassica Oleracea L. var. acephala). Kale samples cultivated in organic and conventional systems were analyzed. The vegetable was weighed, cleaned and stems were separated from leaves. After separation, the samples were submitted to the following modes of preparation: raw (fresh kale); dry heat (braised kale) and moist heat (kale immersed in boiling water). Each treatment consisted of three (3) repetitions. The samples were subjected to analysis of antioxidant Resumo

Chemical characterization of the species Raphanus sativus L. under different conditions of fertilization and water stress conditions

“…When evaluating methanolic extracts of leaves and stems of Brassica oleracea L. var. acephala (kale) in organic and conventional systems, Rigueira et al (2016) also observed greater antioxidant potential in leaves.…”

“…sativus extracts grown under water stress and without fertilization showed higher antioxidant potential (Table 2). Water stress is an abiotic factor that induces the production of phenolic compounds as the plant tends to produce defense substances against unfavorable factors present in the environment (Rigueira, Bandeira, Chagas, & Milagres, 2016).…”

“…Compared to the data presented in the literature, the radish root samples evaluated in this study showed higher DPPH free radical scavenging activity, suggesting that environmental factors, fertilization, and water stress may have influenced the results observed for antioxidant capacity. When evaluating vegetables in conventional and organic systems, Rigueira et al (2016) and Arbos, Freitas, Stertz, & Dornas (2010) found that vegetables under organic fertilization tend to have higher antioxidant activity. Moreover, studying the methanolic extract of B. oleracea leaves at a concentration of 0.1g mL -1 , in organic and conventional systems, Rigueira et al (2016) found a percentage of DPPH reduction equal to 68.6 ± 1.2 and 44.7 ± 1.8%, respectively.…”

Quality of pomegranate peel cultivar Valenciana as determined by different drying methods

“…Bras. Frutic., Jaboticabal, 2020, v. 42, n. 2: (e-431) addition of water from the application of ascorbic acid (AA) which, together with high temperature, can cause a severe denaturation of the compounds present in the pomegranate peel, in an effect similar to the technique of moist heat (RIGUEIRA et al, 2016). Comparisons within the levels of ascorbic acid application showed that the drying chamber treatment at 60±2°C presented a higher content of total phenolic compounds and flavonoids in the absence of AA, while the SD treatment displayed a reverse pattern, with higher values recorded when ascorbic acid was applied (Table 3).…”

Effect of rosemary, garlic, pepper and lemongrass extracts in postharvest of organic Brassica oleracea L. leaves

“…Kale leaf (Brassica oleracea) consumption in Brazil has gradually increased, due to the new ways of uses in the culinary and the recent discoveries about nutraceuticals properties (Novo et al 2010). Kale leaf is a vegetable rich in proteins, carbohydrates, fibers, calcium, iron, vitamin A, niacin and vitamin C, besides being also a great source of antioxidants and phenolic compounds (Rigueira et al 2016).…”