Hazel (Corylus avellana L.) leaves as source of antimicrobial and antioxidative compounds

• Tipo: Artigo em Revista Científica Internacional
• Data: 2007

Autores

Ivo Oliveira (Autor) Outra; Anabela Sousa (Autor) Outra; Patricia Valentao (Autor) FFUP; Paula B Andrade (Autor) FFUP; Isabel C F R Ferreira (Autor) Outra; Federico Ferreres (Autor) Outra; Albino Bento (Autor) Outra; Rosa Seabra (Autor) Outra; Leticia Estevinho (Autor) Outra; Jose Alberto Pereira (Autor) Outra

Revista

Título: Food Chemistry

Vol. 105 Nº 3

Páginas: 1018-1025

ISSN: 0308-8146

Editora: Elsevier

Indexação

ISI Web of Knowledge - 45 Citações

ISI Web of Science

Scopus - 53 Citações

Classificação Científica

FOS: Ciências agrárias > Outras ciências agrárias

CORDIS: Ciências da Saúde

Outras Informações

ID Authenticus: P-004-D5X

DOI: 10.1016/j.foodchem.2007.04.059

Resumo (PT): Aqueous extracts of leaves of different hazel (Corylus avellana L.) cultivars (Cv. M. Bollwiller, Fertille de Coutard and Daviana), were analysed by reversed-phase HPLC/DAD for the definition of their phenolic composition. Antioxidant potential was assessed by the reducing power assay, and the scavenging effect on DPPH (2,2-diphenyl-1-picrylhydrazyl) radicals and β-carotene linoleate model system. Their antimicrobial capacity was also tested against Gram positive (Bacillus cereus, Bacillus subtilis, Staphylococcus aureus) and Gram negative bacteria (Pseudomonas aeruginosa, Escherichia coli, Klebsiella pneumoniae) and fungi (Candida albicans, Cryptococcus neoformans). Eight phenolic compounds were identified: 3-, 4- and 5-caffeoylquinic acids, caffeoyltartaric acid, p-coumaroyltartaric acid, myricetin-rhamnoside, quercetin 3-rhamnoside and kaempferol 3-rhamnoside. A p-coumaric acid, three myricetin and one quercetin derivatives were also detected. The hazel leaves extract presented high antioxidant activity in a concentration-dependent way, in general with similar behaviour of all cultivars. Gram positive bacteria revealed to be very sensitive to hazel leaf extract (MIC 0.1 mg/ml for B. cereus and S. aureus and 1 mg/ml for B. subtilis). However, Gram negative and the fungi displayed much lower sensitivity, being P. aeruginosa and C. albicans resistant at 100 mg/ml. Cv. M. Bollwiller exhibited the most potent antimicrobial activity. <br> <br> Keywords: Hazel leaves; Phenolics; Antioxidant potential; Antimicrobial activity <br> <a target="_blank" href="http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6T6R-4NSX08G-6&_user=2460038&_coverDate=12%2F31%2F2007&_rdoc=18&_fmt=high&_orig=browse&_srch=doc-info(%23toc%235037%232007%23998949996%23663548%23FLA%23display%23Volume)&_cdi=5037&_sort=d&_docanchor=&_ct=60&_acct=C000057398&_version=1&_urlVersion=0&_userid=2460038&md5=feed385fc0d61c0604f56409d4059bdc"> Texto integral</a> <br> <br>

Abstract (EN): Aqueous extracts of leaves of different hazel (Corylus avellana L.) cultivars (Cv. M. Bollwiller, Fertille de Coutard and Daviana), were analysed by reversed-phase HPLC/DAD for the definition of their phenolic composition. Antioxidant potential was assessed by the reducing power assay, and the scavenging effect on DPPH (2,2-diphenyl-l-picrylhydrazyl) radicals and P-carotene linoleate model system. Their antimicrobial capacity was also tested against Gram positive (Bacillus cereus, Bacillus subtilis, Staphylococcus aureus) and Gram negative bacteria (Pseudomonas aeruginosa, Escherichia coli, Klebsiella pneumoniae) and fungi (Candida albicans, Cryptococcus neoformans). Eight phenolic compounds were identified: 3-, 4- and 5-caffeoylquinic acids, caffeoyltartaric acid, p-coumaroyltartaric acid, myricetin-rhamnoside, quercetin 3-rhamnoside and kaempferol 3-rhamnoside. A p-coumaric acid, three myricetin and one quercetin derivatives were also detected. The hazel leaves extract presented high antioxidant activity in a concentration-dependent way, in general with similar behaviour of all cultivars. Gram positive bacteria revealed to be very sensitive to hazel leaf extract (MIC 0.1 mg/ml for B. cereus and S. aureus and I mg/ml for B. subtilis). However, Gram negative and the fungi displayed much lower sensitivity, being P. aeruginosa and C albicans resistant at 100 mg/ml. Cv. M. Bollwiller exhibited the most potent antimicrobial activity.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8