Volume 5, Issue 2 (June 2018)                   J. Food Qual. Hazards Control 2018, 5(2): 41-48 | Back to browse issues page


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Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina – Laboratório Associado, Escola Superior de Bio-tecnologia, Rua Arquiteto Lobão Vital 172, 4200-374 Porto, Portugal , pcteixeira@porto.ucp.pt
Abstract:   (444 Views)
Background: Plant-derived Essential Oils (EOs) have shown remarkable antimicrobial activity against spoilage and pathogenic microorganisms isolated from food products. The objective of the current study was to determine in vitro antimicrobial effects of selected EOs against these microorganisms.
Methods: Antimicrobial activity of EOs against food-borne and spoilage microorganisms was screened by disk diffusion assay; then, the Minimum Inhibitory Concentration (MIC) and Minimal Bactericidal Concentration (MBC) were determined. Statistical analysis was done using SPSS 23.0 software for Windows.
Results: Oregano and thyme EOs showed the highest antimicrobial activity and the lowest MICs, while anise, fennel, garlic, and ginger showed a lower activity with significant differences (p<0.05). It was demonstrated that Salmonella Typhimurium, Escherichia coli, Proteus mirabilis, and Yersinia enterocolitica were the most sensitive bacteria to all the EOs tested (p<0.05). Among Gram-positive bacteria, Listeria innocua was demonstrated to be the most sensitive to most of the EOs (p<0.05). Furthermore, Staphylococcus aureus and Listeria monocytogenes were shown to be more sensitive than Enterococcus spp. (p<0.05). Yeasts were significantly (p<0.05) more sensitive than bacteria and were inhibited by most of the EOs.

Conclusion: The use of the analyzed EOs may be interesting to food processors because of their antimicrobial properties. However, it is necessary to test their use in food products and gauge their sensory implications.

DOI: 10.29252/jfqhc.5.2.3
Full-Text [PDF 498 kb]   (184 Downloads)    
Type of Study: Original article | Subject: Special
Received: 18/03/03 | Accepted: 18/04/29 | Published: 18/06/23

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