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p. 5, l. 50-53: It is surprising that the SPE columns are equilibrated with acetonitrile, the same solvent as used for elution. It might be expected that the target compound is not very efficiently trapped on the SPE cartridge. Normally, the RP SPE material is activated with organic solvent then equilibrated with water or water/organic solvent (a weakly eluting medium). The latter allows for efficient retention of the sample compound.
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