•  VertiPak™ SAX/Carbograph SPE is double-layer SPE tube
    that contains both VertiPak™ Carbograph (upper layer) and
    VertiPak™ SAX (lower layer) sorbents that separated by
    PE frit.
•  Specially used for multi-residue pesticides in foods e.g.
    fruits, vegetables.
•  VertiPak™ SAX is the strongest anion-exchanger that offer
    minimum non-polar secondary interaction. As quaternary
    amine functional group is always charged, SAX is an
    excellent choice for removing of weak acids, and reducing
    of matrix compounds induced ion-suppression.
•  VertiPak™ Carbograph is non-porous graphitized carbon
    black. Its surface contains oxygen complexs forming
    positively charged chemical heterogeneities on surface
    offering rapid primary reversed-phase interaction for  
    multiresidue pesticides.
•  Tube format is available in 7 tube sizes.
•  Tubes are packaged in zip sealing bag protective from
    moisture and light.
•  Includes a Performance report including the QC results, lot
    chromatogram and lot recovery test.