The Strep Tactin beads based on superparamagnetic beads are designed for rapid and efficient separation Strep(II)-tag protein. The Strep-tag is a synthetic peptide consisting of eight amino acids (Trp-Ser-His-Pro-Gln-Phe-Glu-Lys). Generally, it does not interfere with folding or bioactivity. Thus, there is no need for removing the tag. Strep-tagged proteins can be isolated in one step from crude cell lysates. Because the Strep-tag elutes under gentle, physiological conditions it is especially suited for generation of functional proteins. The proteins obtained are bioactive and display a very high purity (above 99%).

Product name NO. Spec Packing Unit Unit Price Add Cart
BeaverBeads™ Strep-Tactin 70808-5 5mL 5 mL, 10%(v/v), 30-150 μm $
BeaverBeads Magrose Strep-Tactin kit 70808-K10 10%(v/v), 30-150 μm 5mL, 10%(v/v), 30-150 μm $
BeaverBeads™ Strep-Tactin 70808-50 50mL 50mL, 10%(v/v) ,30-150 μm $
BeaverBeads™ Strep-Tactin 70808-250 250mL 250 mL, 10%(v/v), 30-150 μm $

1. High capability of antibody binding.
2. Time-saving, simple and mild.
3. Obtained high-purity protein by one-Step.
4. No need removing the tag.


Designation BeaverBeads™  Magrose Strep-Tactin
Bead Diameter (µm) 30μm~150μm
Ligand density ~6mg Strep-Tactin /mL Gel
Protein Binding Capacity ~7mg Strep-tag II protein/mL Gel
Slurry Concentration 10%(v/v)  Suspension
Storage solution 1×PBS(0.1%Tween-20+0.05%NaN3)
Storage temperature 2 ~ 8 °C for long; NO FREEZE
Binding/Washing Buffer 10mM Tris-HCl, 150mM NaCl, 1mM EDTA, pH8.0
Elution Buffer 2.5mM desthiobiotin in Binding Buffer
Regeneration Buffer 0.5M NaOH or 1mM HABA


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