title: Ultrasound-Assisted Extraction and Biological Activities of Extracts ofBrassica oleraceavar.capitata.
abstract: In this work, the antioxidant and antimicrobial activities ofBrassica oleraceavar.capitataextracts obtained through ultrasound-assisted extraction are evaluated. The extracts obtained using the best extraction conditions were subjected to different hydrolysis conditions before their use in the biological tests. The crude and hydrolysed extracts were characterized using gas chromatography coupled with a mass detector. The use of ultrasound at 30 °C with 60% (by volume) solvent enabled obtaining a richer extract. All extracts had antioxidant activities against DPPH (13.0-80.0%), superoxide (35.2-63.2%) and peroxyl (89.3-99.5%) radicals, but the use of hydrolysed extracts considerably improved the antioxidant activities. Antimicrobial activities only of the hydrolysed extracts ofBrassica oleraceavar.capitatawere detected. It was confirmed that antioxidant activity of vegetable extracts can be considerably increased when hydrolysis is applied as a pretreatment to their extraction.
authors.affiliation: Post-Graduate Program in Pharmaceutical Sciences, Federal University of Santa Maria, Camobi Campus, 97105-900 Santa Maria, RS, Brazil.
authors.forename: Valéria
authors.initials: V
authors.lastname: Dal Prá
authors.affiliation: Post-Graduate Program in Pharmaceutical Sciences, Federal University of Santa Maria, Camobi Campus, 97105-900 Santa Maria, RS, Brazil.
authors.forename: Carolina Bolssoni
authors.initials: CB
authors.lastname: Dolwitsch
authors.affiliation: Federal University of Fronteira Sul, Centro, 97900-000 Cerro Largo, RS, Brazil.
authors.forename: Fernanda Oliveira
authors.initials: FO
authors.lastname: Lima
authors.affiliation: Medical and Nursing Department, Federal University of Viçosa, Av. Peter Henry Rolfs, s/n, 36570-000 Viçosa, Brazil.
authors.forename: Camilo
authors.initials: C
authors.lastname: Amaro de Carvalho
authors.affiliation: Post-Graduate Program in Pharmaceutical Sciences, Federal University of Santa Maria, Camobi Campus, 97105-900 Santa Maria, RS, Brazil.
authors.forename: Carine
authors.initials: C
authors.lastname: Viana
authors.affiliation: Post-Graduate Program in Chemistry, Federal University of Santa Maria, Camobi Campus, 97105-900 Santa Maria, RS, Brazil.
authors.forename: Paulo Cícero
authors.initials: PC
authors.lastname: do Nascimento
authors.affiliation: Post-Graduate Program in Pharmaceutical Sciences, Federal University of Santa Maria, Camobi Campus, 97105-900 Santa Maria, RS, Brazil; Post-Graduate Program in Chemistry, Federal University of Santa Maria, Camobi Campus, 97105-900 Santa Maria, RS, Brazil.
authors.forename: Marcelo
authors.initials: M
authors.lastname: Barcellos da Rosa
keywords: Brassica oleracea var. capitata; biological activity; hydrolysis of extracts; ultrasound-assisted extraction