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    Influence of geographic origin on agronomic traits and phenolic content of cv. Gemlik olive fruits
    (Academic Press Inc Elsevier Science, 2018) Ben Ghorbal, Akram; Leventdurur, Sezgi; Agirman, Bilal; Boyaci-Gunduz, C. Pelin; Kelebek, Haşim; Carsanba, Erdem; Darici, Merve
    In this work olive samples of Gemlik variety originated from Turkish regions Serinyol, Bahce, Saricam, Tarsus and Mudanya were harvested at five different times during fruit maturation. The results showed an important effect of environmental factors on the ripening progression based on the agronomic fruit traits and phenolic fraction. Differences in the technological use of olive fruits were observed among samples of different origins. The phenolic compounds of 25 olive samples were analyzed by HPLC-DAD-ESI-MS/MS, and 9 phenolics belonging to different families of phenols were identified and quantified. The harvest time and the geographical location were observed to interact and quantitatively govern the phenolic compounds production during maturation of olive fruits. Gemlik olive phenolic compounds can be used as a marker of each growing area and as a predictor of the optimal harvesting date, to optimize the organoleptic and nutritional value of the end product.
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    Natural Microflora of Different Types of Foods
    (Springer International Publishing Ag, 2019) Erten, Huseyin; Agirman, Bilal; Boyaci-Gunduz, Cennet Pelin; Carsanba, Erdem; Leventdurur, Sezgi
    The sources of thousands of different microorganisms in foods could be either natural or external. The microorganisms in foods are divided into three groups as molds, yeast and bacteria. Natural microflora of foods influences the quality, availability and quantity of products. Molds are generally known as spoilage microorganisms in foods. Therefore, usage of them in food processing is limited (i.e. mold ripened cheese, soybean fermented foods). Conversely, yeasts and bacteria are widely used as important microorganisms in food industry. They have ability to ferment sugars to some industrially important compounds such as ethanol, lactic acid, acetic acid and carbon dioxide. In addition, they can contribute to the texture, flavor and safety of foods. The microorganisms intrinsically existing in food play a key role in processing of numerous foods especially plant based fermented foods, milk and meat based fermented products. The aim of the present chapter is to discuss the natural microflora belonging to different foods and also to explain their functions during food processing.