Compared with natural streptavidin, the recombinant core streptavidin 4 removes the sequence unrelated to the activity, and only retains the core sequence related to the activity. The stability and solubility of the recombinant core streptavidin 4 are superior to natural streptavidin. The sequence was modified to increase the content of amino groups and improve the efficiency of coupling with ligands or magnetic beads by amino groups (pI:8.93).

Size:：1 mg, 10 mg, 100 mg, 500 mg
Formulation: Freeze dried powder (5mM potassium phosphate buffer, trehalose, pH 7.4)
Mol. Wt.：Tetramer 55.2kDa, Monomer 13.8kDa
Theory pI：8.93
Activity：≥16 U/mg protein（Green improved method）
Purity：≥95%（SDS-PAGE）
Concentration determination: UV absorption method, extinction coefficient E(0.1% at 280 nm) = 3.042
Resources: Escherichia coli (E. coli)
Storage Condition: -20 ℃
Conditions of transport: Ambient Temp
Storage Duration: 3 years