Materials and Methods. Isopropanol
used as the eluting medium ensured the most efficient extraction
of ITCs from the sorbent with recoveries of analytes falling in the
range of 86–106%, while ethanol in the range 76–97%. Methanol
gave less satisfactory results; the recoveries were in the range of
62–81%. For the purpose of further experiments, isopropanol was
selected as an eluting medium also for another reason described
in the next section, i.e. high yield of ITC derivatization achieved
in its presence