Page 329 - Tandem Techniques
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The differences that can be observed between different methods of sample preparation are demonstrated
in Figure 8.18. The foreground spectrum was obtained from a small drop of dextrose sugar solution
applied to the surface of the sample collection disk and evaporated. The spot appeared as a round clear
deposit. The middle spectrum was obtained from a potassium bromide pellet made from the same
dextrose sugar. The third spectrum was obtained from a mineral oil mull of the dextrose sample, which
was smeared on the disk surface. The latter two spectra share many of the fine structure artifacts
associated with matrix effects. It is apparent that for certain samples this type of sampling give
improved spectra over those produced by the more conventional sampling procedures. An example of
the use of the tandem instrument for analyzing natural products is the assay of natural orange juice
concentrate.
Figure 8.19.
Spectra of Three Peaks from the Separation
of a Sample of Natural Orange Juice
Courtesy of Lab Connections Inc.
