title: Biochemical composition, antimicrobial activities,and anti-quorum-sensing activities of ethanol and ethyl acetate extracts from Hypericum connatum Lam. (Guttiferae).
abstract: We studied the polyphenol composition and antioxidant activity of the ethanolic and ethyl acetate extracts of Hypericum connatum (Guttiferae), in addition to their antimicrobial and antiquorum-sensing (AQS) properties. The extracts exhibited a similar polyphenol content and a notable antioxidant activity, which was stronger in the ethanolic extract (EC50=3.2 μg/mL). Ultrahigh-performance liquid chromatography analyses revealed different polyphenol profiles, with rutin and apigen being the main components of the ethanolic extract and caffeic acid, (-)-epicatechin and p-coumaric acid being abundant in the ethyl acetate extract. The ethyl acetate extract exhibited a more effective antimicrobial activity than the ethanolic extract against the pathogens Staphylococcus aureus, Bacillus cereus, Escherichia coli, and Pseudomonas aeruginosa. For the first time, AQS activity was detected in H. connatum: the ethanolic extract inhibited the production of violacein, a quorum-sensing-regulated pigment, in a Chromobacterium violaceum tester strain, without interfering with its growth.
authors: Institute of Food Science, National Research Council ISA-CNR, Avellino, Italy.
authors: Florinda
authors: F
authors: Fratianni
authors: Filomena
authors: F
authors: Nazzaro
authors: Aurelio
authors: A
authors: Marandino
authors: Maria Del Rosario
authors: Mdel R
authors: Fusco
authors: Raffaele
authors: R
authors: Coppola
authors: Vincenzo
authors: V
authors: De Feo
authors: Laura
authors: L
authors: De Martino
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D001409:Bacillus cereus / Q000187:drug effects; D002861:Chromobacterium / Q000187:drug effects / Q000502:physiology*; D004926:Escherichia coli / Q000187:drug effects; D020902:Hypericum / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D059808:Polyphenols / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D053038:Quorum Sensing / Q000187:drug effects*; D013211:Staphylococcus aureus / Q000187:drug effects
chemical_list: D000900:Anti-Bacterial Agents; D010936:Plant Extracts; D059808:Polyphenols