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| Fatty acid composition detection and quality identification of linseed oil based on nuclear magnetic resonance technology |
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| KeyWord:NMR linseed oil fatty acid composition quality identification |
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| Abstract: |
| The fatty acid composition and quality identification of linseed oil produced in Shanxi province were studied by nuclear magnetic resonance (NMR). Firstly, gas chromatography-mass spectrometry (GC-MS) method was used to detect and confirm the difference in fatty acid composition between pure linseed oil and adulterated linseed oil. Secondly, the characteristic peaks of the different fatty acids in the adulterated linseed oil were identified by the hydrogen nuclear magnetic resonance spectrum (1H NMR) and carbon nuclear magnetic resonance spectrum (13C NMR) so as to quickly determine whether the linseed oil was adulterated. Finally, the contents of fatty acids in linseed oil were quantitatively calculated by 1H NMR method and national standard GC method, respectively. The results showed that compared with the pure linseed oil, the adulterated linseed oil contained eicosenoic acid and erucic acid; the 1H NMR and 13C NMR characteristic peaks of eicosenoic acid and erucic acid could be used to qualitatively identify whether linseed oil was adulterated; the content of linolenic acid in linseed oil calculated by 1H NMR method was consistent with that by GC method. The detection of fatty acid composition in linseed oil based on NMR technology can quickly identify the quality of linseed oil. |
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