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Adamczak, Artur; Ożarowski, Marcin; Karpiński, Tomasz M
Journal of clinical medicine, 12/2019, Letnik: 9, Številka: 1Journal Article
Among natural substances widespread in fruits, vegetables, spices, and medicinal plants, flavonoids and organic acids belong to the promising groups of bioactive compounds with strong antioxidant and anti-inflammatory properties. The aim of the present work was to evaluate the antibacterial activity of 13 common flavonoids (flavones, flavonols, flavanones) and 6 organic acids (aliphatic and aromatic acids). The minimal inhibitory concentrations (MICs) of selected plant substances were determined by the micro-dilution method using clinical strains of four species of pathogenic bacteria. All tested compounds showed antimicrobial properties, but their biological activity was moderate or relatively low. Bacterial growth was most strongly inhibited by salicylic acid (MIC = 250-500 μg/mL). These compounds were generally more active against Gram-negative bacteria: and than Gram-positive ones: and . An analysis of the antibacterial effect of flavone, chrysin, apigenin, and luteolin showed that the presence of hydroxyl groups in the phenyl rings A and B usually did not influence on the level of their activity. A significant increase in the activity of the hydroxy derivatives of flavone was observed only for . Similarly, the presence and position of the sugar group in the flavone glycosides generally had no effect on the MIC values.
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in: SICRIS
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