Journal
FOOD CHEMISTRY
Volume 211, Issue -, Pages 776-783Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2016.05.134
Keywords
Olive oil composition; Malaxation temperature; Harvest time; Phenolic profile; Fatty acid profile; Oxidative stability; Classification; Multivariate regression
Funding
- Turkey Scholarships Program for International Students (YTB)
- Federal University of Technology Akure
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The aim of the study was to determine the effects of harvest time and malaxation temperature on chemical composition of olive oils produced from economically important olive varieties with a full factorial experimental design. The oils of Ayvalik and Memecik olives were extracted in an industrial two-phase continuous system. The quality parameters, phenolic and fatty acid profiles were determined. Harvest time, olive variety and their interaction were the most significant factors. Malaxation temperature was significant for hydroxytyrosol, tyrosol, p-coumaric acid, pinoresinol and peroxide value. Early and mid-harvest oils had high hydroxytyrosol and tyrosol (maximum 20.7 mg/kg) and pigment concentrations (maximum chlorophyll and carotenoids as 4.6 mg/kg and 2.86 mg/kg, respectively). Late harvest oils were characterized with high peroxide values (9.2-25 meq O-2/kg), stearic (2.4-3.1%) and linoleic acids (9.3-10.4%). Multivariate regression analysis showed that oxidative stability was affected positively by hydroxytyrosol, tyrosol and oleic acid and negatively by polyunsaturated fatty acids. (C) 2016 Elsevier Ltd. All rights reserved.
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