Citrus leaf essential oils: chemical composition, antioxidant activity, and selective antibacterial effects on foodborne and starter culture bacteria during fermentation Citrus Leaf Essential Oils in Lactic Fermentation…
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Abstract
Natural preservation of fermented foods is increasingly important due to consumer demand for safe, additive-free products. This study evaluated lemon (Citrus limon) and mandarin (Citrus reticulata) leaf essential oils as natural preservatives for fermented foods. Chemical analysis using GC/MS showed limonene as the major compound in lemon leaf essential oil (57.96%) and dimethyl anthranilate in mandarin leaf essential oil (54.97%). Antioxidant activity was measured via DPPH and ABTS assays, confirming significant radical scavenging capacity. Antibacterial activity was assessed against food spoilage bacteria using disc diffusion and MIC determination. The smallest inhibition zone was observed for Escherichia coli ATCC 23922 (6.33 ± 0.76 mm) and the largest for Bacillus cereus ATCC 11798 (19.83 ± 0.28 mm), with MICs inversely related to inhibition diameters. Importantly, the impact on fermentation parameters was also investigated. For Streptococcus thermophilus LMS8, lactic acid production reached 8.1 g.L-1 in control cultures and slightly decreased to 7.5 g.L-1 with 50 µL of essential oils, while growth and sugar utilization remained comparable. Lactiplantibacillus plantarum LMF6 exhibited unaffected growth and acidification capacity, with lactic acid levels similar to controls. Citrus leaf essential oils selectively inhibit harmful bacteria while preserving normal fermentation, making them promising natural bio-preservatives for fermented foods.
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References
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