Halo-Trap Magnetic Agarose

Halo-Trap Magnetic Agarose are affinity beads for immunoprecipitation of Halo-tag fusion proteins. It comprises a Halo-tag Nanobody /VHH conjugated to Magnetic Agarose beads.


Immunoprecipitation/ Co-IP
Mass spectrometry
On-bead enzyme assays
ChIP/ RIP analysis

Product Size Code Price Buy
Product Halo-Trap Magnetic Agarose Size 250 µL (10 reactions) Code otma-10 Price $ 275
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Product Halo-Trap Magnetic Agarose Size 500 µL (20 reactions) Code otma-20 Price $ 475
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Product Halo-Trap Magnetic Agarose Size 2.5 mL (100 reactions) Code otma-100 Price $ 2050
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Product Halo-Trap Magnetic Agarose Size 5 mL (200 reactions) Code otma-200 Price Please inquire
Product Halo-Trap Magnetic Agarose Size 10 mL (400 reactions) Code otma-400 Price Please inquire
Product Halo-Trap Magnetic Agarose Kit Size 500 µL (20 reactions) Code otmak-20 Price $ 595
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Product Binding Control Magnetic Agarose Size 500 µL (20 reactions) Code bmab-20 Price $ 75
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Product Halo VHH, recombinant binding protein Size 250 µL Code ot-250 Price Please inquire

Dissociation constant KD of 2 nM

Wash buffer compatibility
2 M urea, 2 M NaCl, 10 mM DTT,  2 % Nonidet P40 Substitute, 2 % Triton X-100


Coupled Nanobody/ VHH
Recombinant, monoclonal anti-Halo single domain antibody (sdAb) fragment

Bead properties
Bead size: ~ 40 µm (cross-linked 6 % Magnetic Agarose beads)
Storage buffer: 20 % EtOH

- SDS sample buffer
- 0.1 mM citric acid pH 3.0
Instead of elution, we recommend on-bead assays like on-bead digestion for MS analysis.

Compatibility with mass spectrometry
The Halo-Trap is optimized for on-bead digestion. Complete tryptic digest results in 6-7 peptides.

Storage instructions
Shipped at ambient temperature. Upon receipt store at 4°C. Stable for one year.

How to cite this product

Should I use an N-terminal or C-terminal fusion tag?

Both the N-terminal or C-terminal fusion tag work well with the traps.

How can I avoid unspecific protein interactions binding to the trap?

For preclearing of your sample we recommend to use our binding controls (bab-20 or bmab-20).

Please find more information in our Troubleshooting guide

How can I elute bound proteins from a trap in their native state?

You can elute your fusion protein of interest with 0.2 M glycine pH 2.5 at room temperature. Pipette the beads up and down for 60-120 seconds and repeat this step. Ensure to neutralize your supernatant immediately afterwards by adding 1 M Tris base pH 10.4.

How many mammalian cells are required for an immunoprecipitation reaction?

For one immunoprecipitation reaction, we recommend using ~10^6 - 10^7 mammalian cells. The yield is also dependent on the expression level of your protein of interest and the interaction partners.

How much cell extract should I use for an immunoprecipitation reaction?

For other type of cells than mammalian cells, we recommend using 0.5 - 1.0 mg of cell extract.

Do I need to elute bound proteins from the beads for mass spectrometry analysis?

No, you can directly conduct an on-bead digestion after immunoprecipitation. This procedure allows faster and more efficient sample preparation and a potential higher yield.
Please find more information here:

Preomics kit

Protocol on-bead digestion

Do I need to elute my protein of interest from the beads for enzymatic assays?

No, you can directly perform your enzymatic assay on the beads if the active center is not blocked.

Please find more information in our application note "enzymatic activity assay"

What is the amount of trap slurry I need for one immunoprecipitation reaction?

25 µL slurry are sufficient for one pull-down reaction as the affinity of the traps is very high.


  • Halo Trap recognizes Halo fusion proteins that are already bound to chloralkane-based ligands of the Halo-tag, e.g. dyes, biotin, etc.
  • Halo-Trap can be used for affinity purification
  • Bound Halo-fusion protein can be eluted without protease
  • Structure and function are characterized

Halo-Trap Magnetic Agarose Kit

The Halo-Trap Magnetic Agarose is also available in a kit, including:

  • Halo-Trap Magnetic Agarose
  • lysis*, wash and elution buffers

*The lysis buffer provided is suitable for mammalian cells. For other cell types use another suitable lysis buffer.

Binding Control for Magnetic Agarose Beads

  • Control for unspecific binding of proteins, DNA, etc. to beads
  • Pre-clearing of cell lysate
  • Binding Control for Halo-Trap Magnetic Agarose

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Only for research applications, not for diagnostic or therapeutic use!