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242 Multidimensional Chromatography

Figure 10.14 Schematic representation of the SFSPE/SFC set-up developed by Murugaverl
and Voorhees (67). Reprinted from Journal of Microcolumn Separation, 3, B. Murugaverl and
K. J. Voorhees, ‘On-line supercritical fluid extraction/chromatography system for trace analy-
sis of pesticides in soybean oil and rendered fats’, pp. 11–16, 1991, with permission from
John Wiley and Sons, Inc.

In 1994, Nam and King (68) developed a SFE
SFC
GC instrumentation system
for the quantitative analysis of organochlorine and organophosphorus pesticide
residues in fatty food samples (chicken fat, ground beef and lard). In this way, SFC
was used as an on-line clean-up step to remove extracted material. The fraction
containing pesticide residues is then diverted and analysed by GC.

10.6 MULTIDIMENSIONAL PLANAR CHROMATOGRAPHY

Thin layer chromatography (TLC) is a very widely used chromatographic technique,
and modern high performance (HP)TLC can be advantageously used instead of
HPLC or GC, in many analytical situations. Much progress in the field of planar
chromatography has been made in recent years, with the literature reporting the use
of MD techniques, the coupling with particular detectors or the use of fully comput-
erized image-processing instruments.