Influence of Protein-Phenolic Complex on the Antioxidant Capacity of Flaxseed (Linum usitatissimum L.) Products

Autor(es)

Drummond e Silva, Fernanda Guimaraes ; Miralles, Beatriz ; Hernandez-Ledesma, Blanca ; Amigo, Lourdes ; Iglesias, Amadeu Hoshi ; Reyes Reyes, Felix Guillermo ; Maria Netto, Flavia

• Tipo de documento: Artigo Científico
• Fonte: Journal of Agricultural and Food Chemistry; v. 65, n. 4, p. 800-809, FEB 1 2017.
• Citações Web of Science: 9

Resumo

The impact of the naturally present phenolic compounds and/or proteins on the antioxidant capacity of flaxseed products (phenolic fraction, protein concentrates, and hydrolysates) before and after simulated gastrointestinal digestion was studied. For that, whole and phenolic reduced products were assessed. Four glycosylated phenolic compounds (secoisolariciresinol and ferulic, p-coumaric, and caffeic acids) were identified in flaxseed products. Phenolic fraction exerts the highest antioxidant capacity that increased by alkaline hydrolysis and by simulated gastrointestinal digestion. The action of Alcalase and digestive enzymes resulted in an increase of the antioxidant capacity of whole and phenolic reduced products. Principal component analysis showed that proteinaceous samples act as antioxidant is by H+ transfer, while those samples containing phenolic compounds exert their effects by both electron donation and H+ transfer mechanisms Protein/peptide-phenolic complexation, confirmed by fluorescence spectra, exerted a positive effect on the antioxidant capacity, mainly in protein concentrates. (AU)

• Processo FAPESP: 10/52680-7 - Atividade antioxidante e bioacessibilidade na forma livre e em emulsao de hidrolisados de linhaca (linum usitatissimum l.);
• Beneficiário: Flavia Maria Netto
• Modalidade de apoio: Auxílio à Pesquisa - Regular