8 ITMP3 / 8éme conférence internationale de photoacoustique et photothermique
J. Phys. IV France 04 (1994) C7-479-C7-482
Dual beam infrared thermal lens spectrometry at 965 cm-l absorption band as a measure of nonconjugated trans fatty acids content in margarine samplesM. Franko1, D. Bicanic2 and P. van de Bovenkamp3
1 Jozef Stefan Institute, Department of Environmental and Analytical Chemistry, Jamova 39, 61111 Ljubljana, Slovenia
2 Laser Photoacoustic Laboratory, Department of Agricultural Engineering and Physics, Agricultural University, Bomenweg 4, 6703 HD Wageningen, The Netherlands
3 Department of Human Nutrition, Biotechnion, Agricultural University, Bomenweg 2, 6703 HD Wageningen, The Netherlands
Dual beam thermal lens spectrometry was applied (at 965 cm-1) for the first time to determine the content of trans unsaturated fatty acids in margarine. An improvement in sensitivity (LOD=0.002%) of more than two orders of magnitude in comparison with traditional infrared technique was achieved.
© EDP Sciences 1994