فهرست مطالب فواد محمودزاده

Chemical preservatives are usually used to reduce or eliminate pathogenic or spoilage microorganisms but their inordinate applications have resulted in toxigenic residuals and adverse effects on consumers, So many researches have been done to substitute the chemicals with naturally occurring compounds, especially plant essential oils. In this study, the chemical compositions of essential Thymus kotschyanus were identified with set GC-MS. Then organoleptic properties, microbial and physicochemical quality of Doogh sample prepared with adding different concentration Thymus kotschyanus essential oil were investigated during 14 day storage. Results of GC-MS analysis indicated that thymol (51.1 %), p-cymene (13.78 %) and γ-terpinene (9.03 %) comprised the highest amount of this EO. T. kotschyanus EO destroyed E.coli O157:H7 in addetive low concentrations to Doogh in same the early days and the MIC that determined by the micro dilution method was 470µg/ml. Based on the results, essential oil doesn’t have significant changes in Doogh physico-chemical properties excepion total solid that essentail Doogh free comparsion with Doogh contain 100 and 200 ppm make significant changes(p<0.05), the Doogh that contain 50 ppm was accepted by panelist. The addition of this EO has no adverse effect on the physicochemical and organoleptic properties of Doogh, also this EO effective substances could be purified and used as natural antibacterial agent, solely or along with others techniques, to prolong food shelf life.

Introduction and Olive oil is one of the important parts of Mediterranean diet. It is considered as unique edible for a single unsaturated fatty acids (oleic acid), pleasant flavor, good stability and special effects of well-being. According to compounds found in olive oil and its impact on human health, this study was conducted to investigate the effect olive oil on Human health. In this study, to access the available studies, searching was carried out in valid scientific databases using the key words Olive Oil, Mediterranean diet, and a total of 76 articles were selected and evaluated. Olive oil contains sterol, phenol compounds and A and E vitamins with useful effects on body and significant reduction of cardiovascular diseases. Olive oil also contributes on chronic diseases prevention such as diabetes, obesity, cancer, oxidation, aging and memory decline. Substituting olive oil instead of other edible ones may protect people against chronic diseases.