Streptavidin Reagents

Streptavidin is a form of avidin produced by Streptomyces avidinii that exhibits somewhat less non-specific binding than egg white avidin, although background staining may still sometimes be a problem. Streptavidin is a homotetrameric protein of approximately 60 kDa composed of four identical subunits of approximately 15 kDa. One molecule of streptavidin binds four molecules of biotin by a non-covalent interaction that is essentially irreversible.

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85878 Streptavidin from Streptomyces avidinii affinity purified, lyophilized from 10 mM potassium phosphate, ≥13 U/mg protein
S4762 Streptavidin from Streptomyces avidinii essentially salt-free, lyophilized powder, ≥13 units/mg protein
S0677 Streptavidin from Streptomyces avidinii recombinant, expressed in E. coli, lyophilized powder
S2890 Streptavidin−Alkaline Phosphatase from Streptomyces avidinii lyophilized powder, 700-2,300 DEA units/mg protein
S6402 Streptavidin−Cy3 from Streptomyces avidinii buffered aqueous solution
S3762 Streptavidin−FITC from Streptomyces avidinii essentially salt-free, lyophilized powder, ≥5 units/mg protein
S3887 Streptavidin–β-Galactosidase conjugate streptavidin 1-2 units/mg protein, lyophilized powder
S9059 Streptavidin−Gold from Streptomyces avidinii ~10 nm nominal (colloidal gold), buffered aqueous glycerol solution
S2415 Streptavidin−Iron Oxide Particles from Streptomyces avidinii buffered aqueous suspension, ~1.5 μm
S9415 Streptavidin−Maleimide from Streptomyces avidinii
S5512 Streptavidin−Peroxidase from Streptomyces avidinii lyophilized powder
S2438 Streptavidin−Peroxidase Polymer, Ultrasensitive
S3402 Streptavidin-R-Phycoerythrin from Streptomyces avidinii buffered aqueous solution