Multidimensional gas chromatography (MDGC) could be an appropriate technique to overcome identification issues in complex food samples such as caramel. MDGC enables the selection of a targeted fraction on the first dimension.
The fraction is then re-separated on a second column that exhibits a different stationaryphase. Another advantage of this technique is the use of 282 L. Paravisini et al. / Food Chemistry 167 (2015) 281–289
cryo-trapping between the two dimensions that can enhance sensitivity by focusing analytes prior to the second separation.