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Citation: CHENG Shi, WANG Xin, LIU Bao-Lin. Low-field Nuclear Magnetic Resonance Relaxation Characteristics of Fatty Acids with Different Chain Lengths and Degree of Unsaturation[J]. Chinese Journal of Analytical Chemistry, ;2018, 46(2): 281-287. doi: 10.11895/j.issn.0253-3820.171056 shu

Low-field Nuclear Magnetic Resonance Relaxation Characteristics of Fatty Acids with Different Chain Lengths and Degree of Unsaturation

School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

Received Date: 1 July 2017
Revised Date: 28 November 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (No. 31201365).

The chemical structure of fatty acid has a great influence on the relaxation characteristic of lipid. In this work, the low-field nuclear magnetic resonance (LF-NMR) relaxation characteristics of fatty acids with different chain lengths or degree of saturation were investigated firstly, and then the relaxation characteristics of binary or ternary fatty acid mixtures were studied. The result showed that except acetic acid, the T₂ relaxation time and T_2W decreased as the carbon chain length increased; but as the unsaturated degree increased, these measures all increased. For the binary fatty acid system, the T₂ relaxation time and T_2W of palmitic acid-oleic acid and stearic acid-oleic acid all increased as oleic acid ratio increased. While for the linoleic acid-oleic acid system, only when the oleic acid ratio was above 40%, the relaxation response changed significantly. For the ternary fatty acid system, the T₂ relaxation time of each linoleic acid/oleic acid/stearic acid system increased with the increase of linoleic acid ratio, while the area ratio S₂₁ decreased, and S₂₂ increased. The higher ratio of oleic acid and the change of the peak area ratio were relatively reduced, and the relative increases of T_2W changed more slowly.
- Fatty acid,
- Chain length,
- Degree of unsaturation,
- Low-field nuclear magnetic resonance,
- Relaxation characteristics
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