Phenolic acids and flavonoids of peanut by-products: Antioxidant capacity and antimicrobial effects

Author(s)

de Camargo, Adriano Costa ; Bismara Regitano-d'Arce, Marisa Aparecida ; Rasera, Gabriela Boscariol ; Canniatti-Brazaca, Solange Guidolin ; do Prado-Silva, Leonardo ; Alvarenga, Veronica Ortiz ; Sant'Ana, Anderson S. ; Shahidi, Fereidoon

• Document type: Journal article
• Source: Food Chemistry; v. 237, p. 538-544, DEC 15 2017.
• Web of Science Citations: 27

Abstract

Peanut skin (PS) and meal from dry-blanched peanuts (MDBP) were evaluated as sources of phenolic compounds. PS rendered the highest total phenolic content, antioxidant capacity towards ABTS radical cation, DPPH and hydroxyl radicals as well as reducing power. Phenolic acids were present in PS and MDBP whereas proanthocyanidins and monomeric flavonoids were found only in PS as identified by HPLC-DAD-ESI-MSn. Procyanidin-rich extracts prevented oxidation in non-irradiated and gamma-irradiated fish model system. Both extracts inhibited the growth of gram-positive (Bacillus cereus, Staphylococcus aureus, Listeria monocytogenes, Geobacillus stearothermophilus) and gram-negative bacteria (Pseudomonas aeruginosa, Pseudomonas fluorescens, Salmonella Enteritidis, Salmonella Typhimurium, Escherichia coli). Regardless of the strain, phenolic acid-rich extracts showed the lowest minimum inhibitory capacity (MIC); therefore presenting higher antibacterial effect. The MIC of phenolic acid-rich extracts (24-49 mu g phenolics/mL) was higher but comparable to Ampicillin (10 mu g/mL). Thus, phenolics in PS and MDBP may serve as antioxidants and antimicrobial compounds. (C) 2017 Published by Elsevier Ltd. (AU)

• FAPESP's process: 12/17683-0 - GAMMA RADIATION AS A TOOL FOR AGRO-INDUSTRIAL WASTES MICROBIOLOGICAL SAFETY AND ITS EFFECT ON THE ANTIOXIDANT PROPERTIES EVALUATED BY IN VITRO TESTS AND MODEL SYSTEMS
• Grantee: Adriano Costa de Camargo
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 15/00336-4 - Enzyme assited extraction of insoluble-bound phenolics from grape by-products: antioxidant and bioactivity potential
• Grantee: Adriano Costa de Camargo
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate