To assess potential analyte losses occurring specifically during
the drying by Speedvac concentrator and reconstitution steps, 3
centrifuge tubes containing 10mL anhydrous grade methanol were
spiked with 100 ng of the target analytes before being vacuum dried
for 3 h and reconstituted in anhydrous acetonitrile. The results of
this assessment are presented in Table 6. Further potential losses
after reconstitution in anhydrous acetonitrile and during drying
under nitrogen gas were also assessed with various drying times
of 5 min, 30 min and 1 h. The results of these assessments are also
presented in Table 6.