ANALYSIS OF MATERIALS AND RESIDUES IN FOOD continued


analyzed in two ways—either with the ATR in contact with the filter and then subtracting the clean filter spectrum (Figure 2) or by pressing the ATR down, then lifting it up and analyzing the residue left on the ATR tip itself. The latter is shown in Figure 4—a significantly cleaner spectrum as


Figure 4 – Analysis of the white residue on the ATR tip.


exhibited an ester peak (around 1750 cm-1 filter spectrum.


), which is prominent in the Figure 5 – Dark particle contains fatty acid and amide material.


Figure 3 is from a region of the filter that was in the flow, but not showing a specific particulate. The entire filter was covered with a white residue, which this spectrum identifies as a fatty acid. This material could be


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