Master Degree / Yüksek Lisans Tezleri
Permanent URI for this collectionhttps://hdl.handle.net/11147/3008
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Master Thesis Assesment of Genes That Play Role in Phenolic Compound Degradation in Olive Orchard Microbiome(Izmir Institute of Technology, 2019) Acar, Ertuğrul; Soyer Dönmez, FerdaThe olive tree (Olea Europea L.) is one of the most important fruit trees in Mediterranean countries. Its products, olive oil and table olives, are important components of the Mediterranean diet and widely consumed all around the World. Olives and virgin oil provide a rich source for phenolic compounds. The plant phenolics are secondary metabolites, and possesses several common biological and chemical properties. In this study, microorganisms were collected from soil, olive leaves, fruits, and Olive fruit fly larva and Olive mill wastewater (OMWW). They were characterized by 16S rRNA analysis. The microorganisms that were tolerant to phenolic compounds were selected in order to seek which genes were associated with the phenolic compound degradation. The genes related to the degradation of the selected organisms were identified by Sanger Sequencing and the level of phenol-degrading gene expression were aimed to be compared by using qPCR and Droplet Digital PCR (ddPCR). Microorganisms which degrade phenolic compounds can be harnessed for the purpose of bioremediation. However, the number of defined phenolic compound degrading microorganisms is still low in the literature. For this reason, many different microorganisms were used at the same time for bioremediation. Investigation of olive orchard microorganisms and phenolic-degrading genes might benefit bioremediation in the future. In this study, 8 different bacterial strains were identified and characterized from olive orchards. After that, their phenol hydroxylase and catechol 1,2 dioxygenase genes tried to be sequenced with primers designed by using of reference strains in NCBI database.Master Thesis Extraction of Phenolic Compounds From Hazelnut Shell Waste(Izmir Institute of Technology, 2018) Şengün, Duygu; Yüksel Özşen, AslıThe main objective of this study is to obtain phenolic compounds from hazelnut shell waste by extraction and to add value to hazelnut shell wastes. Soxhlet extraction, ultrasonic extraction and combined extraction (soxhlet followed by ultrasonic extraction) methods were used for the extraction of hazelnut shell to obtain phenolic and antioxidant compounds. The effect of extracting solvent (ethanol, methanol, n-hexane, acetone and chloroform), extraction time (8h, 2 cycle and 3 cycle) (1 cycle = 20 min for hexane, 25 min for chloroform, 40 min for ethanol, 45 min for methanol and 35 min for acetone), solid-liquid ratio (4, 8 and 12 g / 250 ml) and size of hazelnut shell (1 mm and 2 mm) were investigated on the phenolic content and antioxidant capacity. Gas Chromatography equipped with a Mass Spectrometry (GC-MS) was used for the analysis of liquid products obtained from the extraction of hazelnut shell. Palmitic acid and oleic acid variations were detected at high ratios. The combined extraction method, which was composed of soxhlet and ultrasonic extractions, resulted in a significant increase in the yield of extraction. Also, higher yield was obtained from methanol and ethanol extraction because of the higher polarity of the solvents. On the other hand, it was observed that there was no significant effect of the extraction time on the extraction yield. The highest phenolic content was 0.166 mg gallic acid equivalent/ml and this value was obtained with methanol by combined extraction using 4 g hazelnut shell and 250 ml solvent.