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    Antimicrobial activities, toxicity and phenolic composition of Asphodeline anatolica E. Tuzlaci leaf extracts from Turkey
    (TAYLOR & FRANCIS LTD, 2016) Marino, Andreana; Zengin, Gökhan; Nostro, Antonia; Ginestra, Giovanna; Dugo, Paola; Cacciola, Francesco; Miceli, Natalizia
    The antimicrobial activity of acetone, methanol and aqueous extracts of Asphodeline anatolica E. Tuzlaci leaves was evaluated against American type culture collection, food and clinical isolates (Listeria monocytogenes and Staphylococcus aureus including methicillin-resistant strains-MRSA). Biofilm formation, toxicity and characterisation of the polyphenolic content were analysed. The acetone extract demonstrated a higher antibacterial activity against S. aureus including MRSA strains, L. monocytogenes and Pseudomonas aeruginosa than against other extracts. No effect was observed in biofilm formation. The extracts resulted non-toxic against Artemia salina Leach. The phytochemical screening of extracts indicated that they mainly contained six polyphenols identified as catechin 3-O-gallate, protocatechuic acid, diosmin, rutin, cirsimaritin and kaempferol glucoside. This study is the first report on antimicrobial activity and phenolic content of A. anatolica and contributes to enrich the literature data on the biological properties of this plant. A. anatolica leaves have a potential as source of natural antimicrobial compounds.
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    In vitro activity of plant extracts against biofilm-producing food-related bacteria
    (ELSEVIER SCIENCE BV, 2016) Nostro, Antonia; Guerrini, Alessandra; Marino, Andreana; Tacchini, Massimo; Di Giulio, Mara; Grandini, Alessandro; Akın, Mehtap
    The identification of effective antimicrobial agents also active on biofilms is a topic of crucial importance in food and industrial environment For that purpose methanol extracts of Turkish plants, Ficus carica L. Juglans regia L, Olea europaea L, Punica granatum L. and Rhus coriaria L, were investigated. Among the extracts, P. granatum L. and R. coriaria L showed the best antibacterial activity with minimum inhibitory concentrations (MIC) of 78-625 mu g/ml for Listeria monocytogenes and Staphylococcus aureus and 312-1250 mu g/ml for Escherichia coli and Pseudomonas aeruginosa. SubMICs produced a significant biofilm inhibition equal to 80-60% for L. monocytogenes and 90-80% for S. aureus. The extracts showed also the highest polyphenol content and the strongest antioxidant activity. Bioassay-guided and HPLC procedures demonstrated the presence of apigenin 4'-O-beta-glucoside in P. granatum L and myricetrin and quercitrin in R. coriaria L. Antigenotoxicity of plant extracts was also observed The present findings promote the value-adding of P. granatum L. and R. coriaria L leaves as natural antimicrobial/antioxidant agents for control of food-related bacterial biofilms. (C) 2016 Elsevier B.V. All rights reserved.