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¹ Department of Food Processing, Egirdir Vocational School, Isparta University of Applied Science, 32200, Isparta, Turkey DOI : 10.16882/HortiS.882469 Viewed : 2019 - Downloaded : 1076 Apple is one of the delicious fruit consumed by people. Apple cider vinegar was made through the traditional method and the changes occurred during the 8 week fermentation period were determined in this research. Total titratable acidity, pH, total soluble solids (°brix), total phenolic contents, Oxygen Radical Absorbance Capacity (ORAC) and Trolox Equivalent Antioxidant Capacity (TEAC) assays, phenolic contents were determined. Total phenolic substance, ORAC and TEAC values increased significantly weekly and reached the highest level in the 3^rd week. Total phenolic substance, ORAC and TEAC values of 3^rd week apple vinegar were determined as 1110.63 mg GAE L^-1, 10.92 mM and 21.11 μmol TE mL^-1, respectively. Apple vinegar samples had gallic acid, catechin, epicatechin, chlorogenic acid, and p-coumaric acid. The major phenolic substances in apple vinegar were gallic acid and chlorogenic acid. While gallic acid value of 3^rd and 4^th week apple vinegar were detected 11.91 and 23.69 mg L^-1, respectively; chlorogenic acid value of 4^th and 5^th week apple vinegar were found 46.36 and 49.71 mg L^-1. Antioxidant activity and phenolic substances values were not significant reduction during the acetic acid fermentation. In this study, the formation process of the functional and sensory properties of apple cider vinegar due to the change in the weekly antioxidant and bioactive component content of apple cider vinegar was emphasized. Keywords : Apple cider vinegar, Chlorogenic acid, ORAC, TEAC, Weekly antioxidant activity changes