Person: UYLAŞER, VİLDAN
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UYLAŞER
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VİLDAN
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Publication Profile and total content of phenolics and antioxidant activity of commercial table olives from Turkey(Wageningen Academic Publishers, 2015-01-01) Yıldız, Gökçen; Uylaşer, Vildan; Yıldız, Gökçen; UYLAŞER, VİLDAN; Uludağ Üniversitesi/Ziraat Fakültesi/Gıda Mühendisliği Bölümü; JUE-9939-2023; AAG-8410-2021Phenolic compounds, total phenolic content and antioxidant activity of five commercial table olives (Domat, Edremit green, Kalamata, Edremit black and Gemlik) from Turkey were investigated. Quantitative analysis of phenolic compounds was done by high-performance liquid chromatography and 11 compounds were identified in table olives. The major phenolic compounds detected in olive samples were hydroxytyrosol and tyrosol, respectively. In general, Domat type table olive had higher levels of phenolic compounds, while dry salted Gemlik olives were poor in phenolic compounds compared to other table olives. Total phenolic content of the olive samples (wet basis) range between 229.12 and 415.34 mg caffeic acid/100 g. Antioxidant activity of olives (wet basis) was not related to their phenolics content, the latter showing more variation depending on the olive type. Domat olives (10.01 mu mol Trolox equivalents/g) had significantly (P<0.05) higher antioxidant activity than the other table olives.Publication Determination of phenolic profile of Gemlik olive cultivar(Natl Inst Science Communication-Niscair, 2023-07-01) Yıldız, Esra; Uylaşer, Vildan; UYLAŞER, VİLDAN; Bursa Uludağ Üniversitesi/Ziraat Fakültesi/Gıda Mühendisliği Bölümü.; AAG-8410-2021The effect of variation of harvest time and location on the total phenolic content, antiradical scavenging activity and phenolic compounds composition of leaves of Gemlik olive cultivar obtained from two different location (Gemlik and Mudanya in Marmara Region of Turkey) were investigated. It was determined that the highest total phenolic content (373.36 and 336.70) were observed in April for both region. Among the olive leave samples the highest (93.69%) antioxidant activities were determined in olive leaves grown in Mudanya and harvested in December and (93.86%) in either olive leaves grown in Gemlik and harvested in April. Determination of phenolic compounds in olive leaves was carried out by LC-DAD-ESI-MS/MS. The results of analysis phenolic compounds showed that oleuropein content ranged from 94.21 mg/kg to 860.21 mg/kg in olive leaves. Differences were observed in the concentration of phenolic compounds depending on the harvest time and location in all olive leaf samples.