Patent ID: 7442299

Claim:
A solid phase extraction cartridge comprising a porous resin packed inside an open-ended container, said porous resin comprising at least one ion-exchange functional group, at least on hydrophilic polar component and at least on hydrophobic component, wherein said porous resin is a compound of formula I: and salts thereof, wherein the order of A, B and C may be random, block, or a combination of random and block; wherein 1 100 < ( p + n ) m < 100 1 and 1 500 < p n < 100 1 ; wherein A is selected from the group consisting of wherein B is selected from the group consisting of wherein C is A or modified A, wherein modified A is selected from the group consisting of and wherein X is selected from the group consisting of SO 3 H, CH 2 CO 2 H, CH 2 CH(CO 2 H) 2 , CO 2 H, PO 3 H 2 , PO 2 H 2 , CH 2 PO 3 H 2 , CH 2 CI, CH 2 NH 2 , CH 2 N[(CH 2 ) y CH 3 ] 2 wherein y is any integer from 0 to 18, CH 2 N+[(CH 2 ) y′ CH 3 ] 3 D − wherein y′ is any integer from 0 to 18 and D − is an anion, SO 2 NHR wherein R is polyethylenimine, and CH 2 NHR wherein R is polyethylenimine.