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Essential Oil Yield, Composition, Antioxidant and Microbial Activity of Wild Fennel (Foeniculum vulgare Mill.) from Monte Negro Coast

The aim of this work was to compare the chemical composition and antioxidant activity of the essential oils from two plant parts (leaves and stems) of fennel, wild-grown in the Montenegro seaside. The chemical composition of the isolated essential oils was determined by gas chromatography with mass spectrometry (GC/MS) and flame ionization detection (GC/FID). The yield of the fennel essential oils (FEOs) from leaves (0.83%) was four times higher than that from the fennel stems (0.21%). Forty-six compounds were identified from leaves’ FEOs and were mainly aromatic compounds (68.5%), monoterpenes (17.8%), and others, where the most abundant compounds were (E)-anethole (51.4%) and methyl chavicol (9.3%). Forty-seven compounds were identified in the FEOs from stems, which were mainly aromatic compounds (69.7%), oxygen-containing monoterpenes (14.9%), where the most abundant compounds were also (E)-anethole (55.7%) and methyl chavicol (7.8%). The FEOs from stems showed higher antioxidant activity, with an EC50 value of 2.58 mg/mL, than in the fennel leaves, which had an EC50 value of 6.91 mg/mL. The FEOs show superior antimicrobial activity against Candida albicans (45.3 mm) and Bacillus subtilis (24.0 mm). Isolated essential oils could be used as a safer alternative to synthetic additives in the food industry.