TAILIEUCHUNG - Salmonella A Dangerous Foodborne Pathogen Part 14

Tham khảo tài liệu 'salmonella a dangerous foodborne pathogen part 14', khoa học tự nhiên, công nghệ sinh học phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 314 Salmonella - A Dangerous Foodborne Pathogen Fig. 2. Glandular trichomes of mint gardens observed in electron microscope scan 1000 x before a and after b extraction by steam distillation Lucchesi 2005 . Chemical composition of essential oil Essential oils are composed of a complex mixture. These compounds mainly belong to two families of chemicals terpene compounds and aromatic compounds. The terpene compounds are hydrocarbons of general formula C5H8 n formed from isoprene units Figure 3 and are represented in essential oils mainly monoterpenes sesquiterpenes and rarely few diterpenes. These compounds may be acyclic monocyclic bicyclic or tricyclic Paris 1981 . Fig. 3. Isoprene. The aromatic compounds are derived from phenylpropane which are characteristic of certain species such as cinnamaldehyde in cinnamon essential oil eugenol in the cloves anethol and aldehyde anasique in the essential oils of anise and fennel Fig. 10 Paris 1981 . Aldehyde cinnamique OMe Anethol Aldehyde anisique Fig. 4. Examples of aromatic compounds. Use Thyme Essential Oils for the Prevention of Salmonellosis 315 The majority of the components of EO are monoterpenes they represent 90 of most essential oils. They are volatile usually easily driven by steam have often pleasant odor Lamart 1994 . By the diversity of their structure they can be classified into several groups Bakkali 2008 Table 3 . Several factors may be responsible of the chemical polymorphism of essential oils. The most important are climate soil time harvest and method of storage and retrieval. Genetic factors Echeverrigaray 2001 and the growth cycle Hance 2003 may also influence this variability. Bakkali 2008 . The use of essential oils is of great interest in many areas. Thus the species most studied for their antibacterial and antifungal properties biological activities belong to the Lamiaceae family Thyme oregano savory lavender mint rosemary sage and hyssop. Biosynthesis of essential oil Essential oils are .

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