With Type-II magnetic beads, antibodies after biotination can associate with magnetic beads. In addition to the antibodies listed in Table I, MagQu does supply customer-designed antibody-coated magnetic beads, which also help you bind your antibodies onto magnetic beads. For versatile biomedical applications such as immunoassay, cell sorting, protein purification, MRI contrast enhancement etc., Type-III magnetic beads of 20 to 160 nm in diameter are available in MagQu's product series, as listed in the following table.

Through chemical modification of dextran, the magnetic beads are functionalized with amino group NH3+.  Thus, the beads become electrically positive and easily bind with electrically negative-charge molecules.  For example, NH3+ shows high affinity with nucleic acids.  Thus, Type IV magnetic reagent is useful to magnetically label nucleic acids for applications such as nucleic-acid purification and magnetofection.