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The aim of this study was to examine the antimicrobial activities of ethanol extracts of five plants containing furanocoumarins. Antimicrobial activities of ethanol extracts of Astrodaucus orientalis (L.) Drude, Bifora radians Bieb., Conium maculatum L., Crithmum maritimum L., Daucus carota L., and standard furanocoumarins (umbelliferone, xanthotoxin, and bergapten) were tested against Escherichia coli, Pseudomonas aeruginosa, Bacillus subtilis, Staphylococcus aureus, and Candida albicans using a microdilution method. The minimum inhibition dilution (MID) values of the extracts were determined. Astrodaucus orientalis showed the highest antibacterial activity.

Eleven species of the Boraginaceae family collected in Turkey were analyzed with respect to the amount of γ‐linolenic acid as well as fatty acid composition. γ‐Linolenic acid was found in all species, except for Heliotropium lasiocarpum Fisch. & Mey. and Heliotropium dolosum De Not. Seed oil content ranged from 1.5% in H. lasiocarpum to 22.0% in Anchusa leptophylla ssp. leptophylla. The content of γ‐linolenic acid ranged from 1.7% of total fatty acids in Paracaryum racemosum (Schreber) Britten var. racemosum to 13.7% in A. leptophylla Roemer & Shultes ssp. leptophylla. According to data from our study, A. leptophylla ssp. leptophylla (13.7%), Anchusa azurea Miller var. azurea (11.9%) and Echium plantagineum L. (12.2%) might be considered as new sources of γ‐linolenic acid.

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