Table 2.

Optimisation of SPE semipurification of the ¹⁸F-intermediate

Entry	Dilution of the reaction mixture	Cartridge wash	Loss of 18F-intermediate in SPE waste solution (%)a	n
1	H2O 5 ml	H2O 5 ml	15.3, 16.0	2
2	25% acetonitrile 5 ml	25% acetonitrile 5 ml	Negligible	2

^aProportion of the radioactivity of ¹⁸F-intermediate in the SPE waste solution relative to that of the initial [¹⁸F]fluoride ion (decay corrected)