Evaluation of Proton Nuclear Magnetic Resonance Spectroscopy for Determining the Yield of Fatty Acid Ethyl Esters Obtained by Transesterification
This study systematically evaluates the use of proton nuclear magnetic resonance (1H NMR) spectroscopy for determining the composition of soybean oil ethyl transesterification product mixtures by comparing the compositions measured by 1H NMR spectroscopy and high-performance liquid chromatography (H...
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| Published in: | Energy & fuels Vol. 29; no. 11; pp. 7343 - 7349 |
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| Main Authors: | , , , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
American Chemical Society
19-11-2015
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| Online Access: | Get full text |
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| Summary: | This study systematically evaluates the use of proton nuclear magnetic resonance (1H NMR) spectroscopy for determining the composition of soybean oil ethyl transesterification product mixtures by comparing the compositions measured by 1H NMR spectroscopy and high-performance liquid chromatography (HPLC). The influence of the sample composition on the results is also discussed. For many of the samples, the triacylglycerol (TAG), diacylglycerol (DAG), monoacylglycerol (MAG), and fatty acid ethyl ester (FAEE) contents could be determined by HPLC. When the conversion of the TAGs into FAEEs is incomplete, the evaluation of the FAEE content by 1H NMR spectroscopy must be performed with caution because of overlapping signals in the spectrum. In this study, three equations were used to calculate the ethyl ester content from the 1H NMR results. The contents calculated using eq 3 agree with the HPLC results the best, as shown by the slope obtained by linear regression of the two data sets. |
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| ISSN: | 0887-0624 1520-5029 |
| DOI: | 10.1021/acs.energyfuels.5b01636 |