Effect of Positional Distribution of Linoleic Acid on Oxidative Stability of Triacylglycerol Molecules Determined by 1H NMR. (15th January 2015)

• Record Type: Journal Article
• Authors: Wang, Xiang‐Yu; Yang, Dan; Gan, Lu‐Jing; Zhang, Hua; Shin, Jung‐Ah; Lee, Yong‐Hwa; Jang, Young‐Seok; Lee, Ki‐Teak
• Is Part Of: Journal of the American Oil Chemists' Society. Volume 92:Number 2(2015)
• Page Start: 157
• Page End: 165
• Publication Date: 2015-01-15
• Subjects: 1H NMR -- Linoleic acid -- Positional distribution -- Oxidative stability; Oils and fats -- Periodicals; Soap -- Periodicals; Fats -- Periodicals; Food-Processing Industry -- Periodicals; Acides gras -- Périodiques; Aliments -- Industrie et commerce -- Périodiques; Huiles et graisses -- Périodiques; Savon -- Périodiques; Oliën; Chemie; Oils and fats; Soap; Periodicals; 547.77
• DOI: 10.1007/s11746-015-2590-y
• Languages: English
• ISSNs: 0003-021X

Abstract

Abstract: 1 H nuclear magnetic resonance ( 1 H NMR) was used to determine the effect of positional distribution of linoleic acid (L) on the oxidative stability of triacylglycerols. For this purpose, structured soybean oil (SSO), which had a similar total fatty acid composition but a different L positional distribution than soybean oil (SO), was produced by interesterification reaction. The SO and SSO were oxidized in the dark at 40 °C. Afterwards, 1 H NMR was used to monitor the oxidation process and quantify the main polyunsaturated fatty acid, Z, E ‐ and E, E ‐conjugated forms, hydroperoxides, and aldehydes at different oxidation periods in a single run. After 45 days of oxidation, SSO showed lower L content than SO (9.9 ± 1.1 and 16.8 ± 0.5 %, respectively). Additionally, secondary oxidation products in SSO were shown to be more abundant than in SO (82.3 ± 4.9 and 43.6 ± 0.9 mmol/L oil, respectively). This study indicated that SO, which contains a higher distribution of L at the sn ‐2 position, was more resistant to autoxidation than SSO.