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Title: Effects of malaxation temperature and harvest time on the chemical characteristics of olive oils
Authors: Jolayemi, Olusola Samuel
Tokatlı, Figen
Özen, Banu
Keywords: Classification
Fatty acid profile
Harvest time
Malaxation temperature
Multivariate regression
Olive oil composition
Oxidative stability
Phenolic profile
Issue Date: 15-Nov-2016
Publisher: Elsevier Ltd.
Source: Jolayemi, O. S., Tokatlı, F., and Özen, B. (2016). Effects of malaxation temperature and harvest time on the chemical characteristics of olive oils. Food Chemistry, 211, 776-783. doi:10.1016/j.foodchem.2016.05.134
Abstract: 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 O2/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.
ISSN: 0308-8146
Appears in Collections:Food Engineering / Gıda Mühendisliği
PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collection
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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