2.4.4. Solid phase extraction of neotame
Two milliliter of filtrate was introduced in SPE cartridge previously
conditioned with 3 ml methanol followed by 20 ml HPLC
water. The flow rate through the cartridge was lower than 1 ml/
min. The cartridge was then washed with 10 ml HPLC water to
remove impurities. Neotame absorbed on the cartridge was eluted
with 3 ml of methanol. The eluate was concentrated to dryness by
nitrogen drying. The residue was dissolved in 1 ml of methanol and
filtered through a 0.22 lm membrane filter. A 20 ll aliquot of the
filtrate was injected into the HPLC