Antioxidant activity and bioaccessibility of phenolic compounds in white, red, blue, purple, yellow and orange edible flowers through a simulated intestinal barrier. (May 2020)

• Record Type: Journal Article
• Authors: de Morais, Janne S.; Sant'Ana, Anderson S.; Dantas, Aline M.; Silva, Beatriz S.; Lima, Marcos S.; Borges, Graciele C.; Magnani, Marciane
• Is Part Of: Food research international. Volume 131(2020)
• Publication Date: 2020-05
• Subjects: Bioaccessible phenolics -- Cosmos sulphureus -- Rosa chinensis -- Antioxidant capacity -- Anthocyanins -- In vitro digestion; Food -- Analysis -- Periodicals; Food industry and trade -- Periodicals; Food industry and trade -- Canada -- Periodicals; Food Technology -- Periodicals; Food -- Periodicals; Food-Processing Industry -- Periodicals; Aliments -- Industrie et commerce -- Périodiques; Aliments -- Industrie et commerce -- Canada -- Périodiques; Aliments -- Recherche -- Périodiques; Food industry and trade; Canada; Periodicals; Electronic journals; 664.005
• DOI: 10.1016/j.foodres.2020.109046
• Languages: English
• ISSNs: 0963-9969

Abstract

Graphical abstract: Highlights: Phenolic acids, stilbenes, flavanol, anthocyanin, flavonol and flavanone were detected in all flowers. The orange flower cosmos presented the highest content of phenolic compounds. Bioaccessibility of phenolics varied among the compounds and within the flower source. Before in vitro digestion mini rose displayed the highest activity in FRAP and DPPH assays. The dialyzed fraction of cravine showed the highest activity in DDPH assay. Cosmos and mini rose are source of bioaccessible phenolics with great antioxidant activity. Abstract: This study assessed the phenolics and their bioaccessibility through an in vitro digestion system coupled to a simulated intestinal barrier in eight edible flowers of distinct colors, namely mini rose, torenia, mini daisy, clitoria, cosmos, cravine, begonia and tagete. The antioxidant activity of the flowers before in vitro digestion, in their derived dialyzed and non-dialyzed fractions was evaluated using distinct approaches. All flowers presented in their composition phenolic acids, stilbenes, flavanol, anthocyanin, flavonol and flavanone, however distinct compounds and contents were found in each flower. The bioaccessibility varied among the phenolics and within the flower source (p < 0.05). Cosmos presented the highest (p < 0.05) content of phenolics and activity in ORAC assay before in vitro digestion and in dialyzed and non-dialyzed fraction; the observed activity was correlated (r = 0.9) to its major compounds, hesperidin and rutin, as well as to caftaric acid and procyanidin B2. Mini rose displayed the highest antioxidant activity in FRAP and DPPH assays before in vitro digestion; its dialyzed and non-dialyzed fraction showed the highest activity in FRAP, correlated to pelargonidin 3, 5-diglucoside, catechin, epicatechin galate, epicagocatechin galate, procyanidin A2, quercitin 3-glucoside and trans- resveratrol (r = 0.9). In DPPH assay, mini rose showed the highest activity in the non-dialyzed fraction, while cravine showed the highest activity in the dialyzed fraction, which was mainly correlated to syringic acid (r = 1.0), pelargonidin 3, 5-diglucoside and epicatechin (r = 0.9). Results show great variability in the phenolic composition and their bioaccessibility among the edible flowers studied. Our findings indicate cosmos and mini rose as sources of bioaccessible phenolics with great antioxidant activity.