Oil oxidation in the emulsions was determined based on the headspace oxygen consumption as a loss of reactant (oxygen) in the oil oxidation, and the hydroperoxide contents were also determined as a primary product of oil oxidation. Monitoring of oxygen consumption is a very useful tool for the analysis of oil oxidation in an emulsion since it does not require extracting the oil phase before analysis and focuses on the loss of substrate in the oxidation reactions (Kristinova and others 2009). It also enables continuous monitoring of the oxygen concentration in the system and easy changes of environmental conditions such as light as well as addition of prooxidants and antioxidants to the system during the oxidation process. Thus, the oxygen consumption has been employed to provide direct information on the oil oxidation in emulsions (Mozuraityte and others 2006; Mozuraityte and others 2008; Carvajal and others 2009: Kristinova and others 2009: An and Choe 2011; Kristinova and others 20 Headspace oxygen content was determined by gas chromatography (GC; Lee and Choe 2011) using a YL 6100 gas chromatograph (Younglin In strument Co., Ltd., Anyang, Korea) equipped with a autosampler and a thermal conductivity detector. The injection volume was 5 mL. A column was the stainless steel column packed with