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Effect of the extraction process on the phenolic compounds profile and the antioxidant and antimicrobial activity of extracts of pecan nut [Carya illinoinensis (Wangenh) C. Koch] shell

2013; Elsevier BV; Volume: 52; Linguagem: Inglês

10.1016/j.indcrop.2013.11.031

1872-633X

Ana Cristina Pinheiro do Prado, Helen Silvestre da Silva, Sheila Mello da Silveira, Pedro Luiz Manique Barreto, Cleide Rosana Werneck Vieira, Marcelo Maraschin, Sandra Regina Salvador Ferreira, Jane Mara Block,

Essential Oils and Antimicrobial Activity

In this study, the effect of the extraction processes (infusion, infusion followed by spray drying, ethanol extraction and supercritical extraction) on the total content and profile of phenolic compounds, antioxidant and antimicrobial activities of extracts of pecan nut shell were studied. The extract obtained through infusion followed by atomization in a spray dryer showed significantly higher (p < 0.05) contents of total phenolic compounds (590.78 mg GAE/g) and condensed tannins (412.10 mg CE/g), and significantly greater antioxidant activity (ABTS and DPPH assays) as compared with extracts obtained by infusion only, ethanol extraction and supercritical extraction. Five major phenolic compounds (gallic, chlorogenic and p-hydroxybenzoic acids, epigallocatechin and epicatechin gallate) were identified and quantified by HPLC in the obtained extracts. The minimum inhibitory concentration and minimum bactericidal concentration against Listeria monocytogenes, Staphylococcus aureus, Vibrio parahaemolyticus and Bacillus cereus were significantly lower (p < 0.05) for the extract obtained through infusion followed by atomization in a spray dryer when compared to the other extracts.