Abstract
Essential oils have great potential in the field of food industry as they effectively prevent the presence of several bacterial and fungal pathogens. Essential oils are complex volatile compounds, synthesized naturally in different plant parts during the process of secondary metabolism. The main goal of this work was to made a qualitative evaluation antibacterial properties of 24 chemotyped essential oils against the growth of Bacillus subtillis. This gram positive bacteria is responsible for rope disease in bread preservation processes. The study was carried out using disk-diffusion in agar method. Biological activity is observed in five essential oils from Cymbopogon Martinii var. motia, Thymus vulgaris QT Linanol, Thymus satureioides, Mentha piperita and Eugenia caryophyllus. The first three have in common some terpenic derivatives: Geraniol, Linalool and Carvacrol. The Cymbopogon Martinii essential oil, is one of the botanicals with the highest geraniol content (up to 93%), showed more activity antimicrobial. A contributing role of this knowledge could be the design of Cymbopogon Martinii essential oil formula, can be used in bakery industry as preservative, such as nano-encapsulation for bakery doughs, active packaging of baked products or surface disinfectants.
Highlights
Essential oils (EO) are aromatic and volatile liquids extracted from plants material, such as flowers, aerial parts, roots, bark, leaves and fruits (Burt, 2004)
EOs and their constituents play a key role in exerting antimicrobial activity, the result of screening of twenty-four EOs (Table 1S) was evaluated against B. subtillis
The inhibition of EOs was show as inhibition diameter against the bacterial grow (Table 1), while the control with vegetal oil does not affect the growth of bacteria
Summary
Essential oils (EO) are aromatic and volatile liquids extracted from plants material, such as flowers, aerial parts, roots, bark, leaves and fruits (Burt, 2004). The chemical composition of EOs is complex, one of them, there may have around of 20-60 different bioactive components, and only two or three are the major components at concentration within range to 20-70%; the others are in traces. These composition of EOs from a one species of plant can differ from the geographic location, the hardvesting seasons or extraction method [1, 2]. EOs are secondary metabolites formed by plants, their main role is to protect them against conditions of biotic and abiotic stress. The exact mechanism of Proceedings 2019, 2019 www.mdpi.com/journal/proceedings bacteriostatic or bactericidal activity and antimicrobial effects of EOs are not exactly known, they are known to cause structural and functional damage to the membrane of bacteria by various antimicrobial mechanisms or alteration of proton pump [5,6,7,8,9]
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