This paper includes the results of the first study about the phenolic characteristics and antimicrobial analyses of Geranium ibericum subsp. jubatum species found in Turkey. In present work the phenolic contents of different parts of the G. ibericum (flower, root, leaf) were determined by HPLC-DAD and LC-MS/MS. Following phenolic compounds were investigated: catechin, protocatechuic acid, gallic acid, ellagic acid, chlorogenic acid, 4-hydroxybenzaldehyde, p-coumaric acid, rutin, naringenin, kaempferol. According to the results obtained, the root and flower parts of the plant are very rich in ellagic acid (3473.57 µg g-1 dry plant) and catechin (2228.76µg g-1 dry plant). Chlorogenic acid level (54.570 µg g-1 dry plant) is also high in the roots. The amount of protocatechuic acid (122.5 µg g-1 dry plant) and gallic acid (725.34 µg g-1 dry plant) is high in the leaves. In addition, the total extract of G. ibericum obtained from leaf, flower, and root were tested against six gram-negative bacteria, and Candida albicans. The G. ibericum extract was nearly as effective as commercial antibiotics at some concentrations for Acinetobacter baumannii, Klebsiella pneumonia, Proteus mirabilis, and Bacillus cereus.
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