Immobilized metal ion affinity chromatography (IMAC) resins are commonly used to purify his-tagged proteins, also untagged recombinant or native proteins. The chemical affinity of the resins is based on the coordination bonds between amino groups (histidine, tryptophan, cysteine, etc.) on protein surface and transition metal ions (Ni+2, Co+2, etc.) immobilized on the resins.

IMAC resins supplied by Amerigo Scientific are made from rigid, 80 µm mono-sized polymethacrylate matrix that carries iminodiacetic acid (IDA) chelating ligand or nitrilotriacetic acid (NTA) chelating ligand. The Ni2+ charged IMAC resin products include UniIDA-80Ni and UniNTA-80Ni. The uncharged IMAC resin products include UniIDA-80L and UniNTA-80, which can chelate with varied metal ions such as Cu2+, Ni2+, Zn2+ and Co2+.


Characteristics UniIDA-80L UniNTA-80L UniIDA-80Ni UniNTA-80Ni
Matrix Mono-Sized Crosslinked Polymethacrylate Resin
Chelating Ligand IDA NTA IDA NTA
Metal Ion Charged Uncharged Uncharged Ni+2 Ni+2
Particle Size ~80 µm
Metal Ion Capacity ~30 μm/mL (Ni2+) ~50 μm/mL (Ni2+) ~30 μm/mL (Ni2+) ~50 μm/mL (Ni2+)
Dynamic Binding Capacity NA NA > 20mg His-tagged protein > 15mg His-tagged protein
pH Range 2-12 2-12 2-12 2-12
Maximum Pressure (MPa) 0.5 0.5 0.5 0.5


Product Name Cat. No. Particle Diameter Pore Size Size
UniIDA-80L 04085-080100 80 μm   10ml; 30ml; 100ml; 1L
UniNTA-80L 04086-080100 80 μm   10ml; 30ml; 100ml; 1L
UniIDA-80Ni 04087-080100 80 μm   10ml; 30ml; 100ml; 1L
UniNTA-80Ni 04088-080100 80 μm   10ml; 30ml; 100ml; 1L


  • Rigid, mono-sized matrix enables high flow rate operation
  • Tolerant of NaOH and high concentration reducing agents, simplified sample pretreatment, much improved protein activity protection
  • Competitive binding capacity
  • Minimal ligand loss, stable in cleaning, and long service life

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