Streptavidin Recombinant r-SA Core Streptavidin Recombinant r-cSA

Streptavidin Recombinant 
General description
Streptavidin is a tetrameric protein secreted by Streptomyces avidinii which binds firmly to biotin. Streptavidin is widely used in molecular biology through its unique high affinity for the vitamin biotin. The dissociation constant (Kd) of the biotin-streptavidin complex is about ~10-15 mol/L. The strong affinity recognition of biotin and biotinylated molecules has made streptavidin one of the most important components and laboratory kits. The streptavidin/biotin system has one of the biggest free power of association of yet observed for noncovalent binding of a protein and small ligand in aqueous solution (K_assoc = 10**14). The complexes are also extremely stable over a wide range of temperature and pH.

Streptavidin Recombinant r-SA
CAS NO.: 
Source: Escherichia coli.(No animal components are used in the manufacturing process of this product, animal-free material.)
Form: Lyophilized
Formulation: Lyophilized from 5mM PB(Na2HPO4, NaH2PO4, pH6.0)
Mol. Weight: Subunit monomer 16.5kDa Tetramer 66.5kDa 
Appearance: White powder
Purity:  ≥95% (SDS-PAGE)
Specific activity: ≥15U/mg(Green)
Isoelectric Point: 6.42
A280nm(1 mg/mL): 2.689 
Endotoxin:  < 0.1EU/μg (kinetic LAL)
Reconstitution: Dissolve with distilled water
Package: 1mg,10mg,100mg,500mg
Storage&Shift life: -20ºC 3years 
Application: Lab Reasearch

Core Streptavidin Recombinant r-cSA
CAS NO.: 
Source: Escherichia coli.(No animal components are used in the manufacturing process of this product, animal-free material.)
Form: Lyophilized
Formulation: Lyophilized from 5mM PB(Na2HPO4, NaH2PO4, pH7.4)
Mol. Weight: Subunit monomer 13.3kDa Tetramer 53.2 kDa 
Appearance: White powder
Purity:  ≥95% (SDS-PAGE)
Specific activity: ≥16U/mg(Green)
Isoelectric Point: 6.09
Endotoxin:  < 0.1EU/μg (kinetic LAL)
Reconstitution: Dissolve with distilled water
Package: 1mg,10mg,100mg,500mg
Storage&Shift life: -20ºC 3years 
Application: Lab Reasearch

Core Streptavidin Recombinant r-cSA (with insert cysteine residue)
CAS NO.: 
Source: Escherichia coli.(No animal components are used in the manufacturing process of this product, animal-free material.)
Form: Lyophilized
Formulation: Lyophilized from 5mM PB(Na2HPO4, NaH2PO4, pH7.4)
Mol. Weight: Subunit monomer 13.5kDa Tetramer 54 kDa 
Appearance: White powder
Purity:  ≥95% (SDS-PAGE)
Specific activity: ≥16U/mg(Green)
Isoelectric Point: 6.04
Endotoxin:  < 0.1EU/μg (kinetic LAL)
Reconstitution: Dissolve with distilled water
Package: 1mg,10mg,100mg,500mg
Storage&Shift life: -20ºC 3years 
Application: Lab Reasearch
Limitations: For LABORATORY RESEARCH USE ONLY and is not approved for use in humans or clinical.