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Determination of totaltrans fatty acids in foods: Comparison of capillary-column gas chromatography and single-bounce horizontal attenuated total reflection infrared spectroscopy

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Journal of the American Oil Chemists’ Society

Abstract

The totaltrans fatty acid content of 18 food products was determined, after acid hydrolysis, extraction and methylation of fatty acids, by gas chromatography with a polar 100% cyanopropylsiloxane capillary column and by single-bounce horizontal attenuated total reflection spectroscopy (SB-HATR). Thetrans fatty acid methyl esters (FAME) of 9-hexadecenoate (9t-16:1), 9-octadecenoate (9t-18:1), and 9,12-octadecadienoate (9t,12t-18:2) were identified by comparison of their retention times with those of known standards and quantitated. The isomersc,t- andt,c-18:2 were identified from their published retention times and included in the quantitation oftrans FAME. Neat 50-μL portions of the FAME that were used for gas-chromatographic analysis also were analyzed by SB-HATR. This technique requires neither weighing nor quantitative dilution of test portions prior to spectroscopic quantitation of isolated double bonds oftrans configuration. A symmetric 966-cm−1 absorption band on a horizontal background was obtained from unhydrogenated soybean oil FAME as the reference material. For 9 of 11 products withtrans fat content>5% of total fat, results obtained by SB-HATR were higher than those obtained by gas chromatography. Results obtained by the gaschromatographic procedure were slightly to significantly higher than those obtained by SB-HATR for the six foods in whichtrans fat content was <5% of total fat.

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Authors and Affiliations

  1. Office of Scientific Analysis and Support, Center for Food Safety and Applied Nutrition, Food and Drug Administration, 20204, Washington, DC

    Magdi M. Mossoba

  2. Food and Drug Administration, Office of Food Labeling (HFS-175), 200 C. St., S. W., 20204, Washington, DC

    Laila H. Ali, Gerald Angyal, Carol M. Weaver & Jeanne I. Rader

Authors
  1. Laila H. Ali
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  2. Gerald Angyal
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  3. Carol M. Weaver
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  4. Jeanne I. Rader
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  5. Magdi M. Mossoba
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Ali, L.H., Angyal, G., Weaver, C.M. et al. Determination of totaltrans fatty acids in foods: Comparison of capillary-column gas chromatography and single-bounce horizontal attenuated total reflection infrared spectroscopy. J Am Oil Chem Soc 73, 1699–1705 (1996). https://doi.org/10.1007/BF02517975

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  • DOI: https://doi.org/10.1007/BF02517975

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