Strong cation exchange cartridge

An appropriate portion of the water extract (Figure 2, fraction 2) is eluted slowly through a conditioned SCX (100 or 200 mg) cation-exchange cartridge or a strong cation-exchange resin material... 

The approximate relative selectivity for strong cation-exchange is shown in h igure 6.5. Hydrogen ion is only weakly held compared to the majority of other cations. This fact is important in that the majority of the SPE cartridges... 

S, Q, IP, N Chicken muscle QuEChERS liquid extraction with 1% (v/v) acetic acid/ACN and sodium sulfate, followed by d-SPE clean-up with a Bondesil-NH2 sorbent (plus additional strong cation exchange clean-np with Bond Elnt SCX cartridges for NMZs) 15... 

There ate several examples of the use of lEC systems for purification, isolation, and separation of heterocyclic bases. Based on ion-exchange SPE, a first and reliable procedure for the extraction of food tetrahydro-(S-carboline, is accomplished on strong cation-exchange (SCX-benzenesulfonic acid cartridges) columns. Water and/or alcoholic extracts of polyhydroxy alkaloids containing many other polar constituents are also purified by the use of resins. The acidified aqueous solution is iplied to the column and unretained neutral or acidic substances are eluted with water. The alkaloids, which... 

Sample preparation Condition a SPEC 3 mL 15 mg MPl nonpolar reversed-phase/ strong cation exchange SPE Cartridge (Ansys) with 500 xL MeOH and 500 tL 40 mM formic acid. Mix 1 mL plasma with 15 tL 20 ng/mL IS and 1 mL 100 mM formic acid, add to the SPE cartridge, rinse tube with 0.5-1 mL water, add rinse to the SPE cartridge, wash with 500 xL water, dry under vacuum, wash with two 500 tL portions of toluene dichloromethane 60 40, dry under vacuum, elute with 600 tL toluene methylformate 20 80. Evaporate the eluate to dr3mess under a stream of nitrogen at 30°, reconstitute the residue with 125 p,L MeOH water 50 50, inject a 35 p.L aliquot. 

Sample preparation Condition a Bond Elut SCX strong cation exchange SPE cartridge with 1 mL MeOH, 1 mL water, and 1 mL 1 mM pH 7.0 disodium hydrogen phosphate buffer. Mix 500 tiL plasma or 100 tiL urine with 100 tiL 20-50 xg/mL IS in water and 100-500 16% trichloroacetic acid, add the supernatant to the SPE cartridge, wash... 

Fig. 4. General guidelines for selecting the type of SPE cartridge to be used. SAX, strong anion exchange amino, amino column SCX, strong cation exchange WCX, weak cation exchange RP, reverse phase NP, normal phase IE, ion exchange.

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