Streptavidin

Streptavidin Coated Surface is a powerful and universal instrument for binding any biotinylated molecule.

Streptavidin is the most popular and widely available biotin-binding protein for research methods. It is a tetrameric protein (M.W. 60 kDa) with very high affinity for biotin (Ka=10 ^–15 M). Biotin is a small molecule which can be conjugated to many proteins without losing or altering their activity. Each protein can bind many biotin molecules. The bond is the strongest known non-covalent biological interaction.

The Streptavidin Coating is a surface treatment that allows to bind any biotinylated molecule (Antibodies – Antigens – Proteins – Peptides – Polysaccharides – Oligonucleotides – DNA fragments etc.). It finds a special application for those molecules which do not offer reliable bonding by passive adsorption or adsorb in an unfavorable orientation. For example,  Streptavidin Coated Plates are suitable with ELISA assays protocol.

Each subunit of Streptavidin binds one molecule of Biotin giving at Streptavidin Coated Surface a greater assay sensitivity. Streptavidin-Biotin binding main features are specificity, stability, and affinity.

96-Well Plates

• Streptavidin Coated 96-Well Plates
• Streptavidin Coated 96-Well Breakable Strip Plates
• Streptavidin Coated 96-Well Strip Plates
• Streptavidin Coated 96-Well Solid Plates

Other 96-Well Plates

PCR Products

• Streptavidin Coated PCR 8 strip tubes
• Streptavidin Coated PCR plates

Other PCR Products

Special Products

• Streptavidin Coated 12×75 mm Tubes

Biomat’s Streptavidin Coated plates and tubes have the following characteristics:

• Ready to use
• Manufactured under ISO:9001 guidelines
• Post-coated (blocked) for low non specific binding and long-term stability
• All lots are tested for uniformity and reproducibility
• Certificate of Quality is released for every lot
• For Research Use Only

Also, Streptavidin Coated Products ensures:

Uniformity

The Streptavidin Coated products show a CV% less than 5 using biotin-HRP as detector and TMB as substrate.

Storage and Stability

The Streptavidin coated products, if unopened, are stable at 2-8°C until the expiration date printed on the label. If opened, store in closed pouch with desiccant and use within the expiration date.

Coating

Streptavidin is coated using 200 µl/well. 

The following parameters were analysed to determine the functional features of the Streptavidin coated plates, 

1. Binding capacity towards Biotin.
2. Specificity towards Biotin.
3. Binding capacity towards Biotinylated IgG.
4. Stability tests: 

1. • Endurance under strong chemical contacts.
   • Shelf life at 37°C.
   • Temperature stress (transport simulation).
   • Long storage.
   • Binding capacity towards Biotin.

1. Binding capacity towards Biotin

Streptavidin coated wells (and BSA saturated control wells ) were incubated with a calibrated Biotin solution. Subsequently, aliquots of this solution, concomitantly with Biotin standards, were mixed with biotinylated peroxidase and transferred into new empty Streptavidin coated wells. From the amount of enzyme bound to the solid phase, the Biotin content of the samples was calculated.

This value was compared with the amount of biotin originally added; from the difference (corrected for-non specific binding of biotin to the control wells), the capacity of the wells for biotin was derived.

2. Specificity towards biotin

Streptavidin Coated Wells were incubated with solutions of biotinylated peroxidase and non biotinylated peroxidase (blanks) as a catcher in a ELISA format using TMB as substrate.

3. Binding capacity towards biotinylated HIgG

Streptavidin coated wells were incubated with biotinylated HIgG in an ELISA format using HIgG-HRP as a detector and TMB as substrate.

See binding capacity and specificity technical notes.

4. Stability tests

Endurance under strong chemical contacts

Endurance under strong chemical contacts was determined following method 1 (Biotinylated IgG from 500 to 0 ng/ml)  where the first washing step was substituted by the following incubations:

Shelf life at 37°C

Streptavidin coated wells maintained for 15 days at 37°C in comparison with standard stored at 4°C, were analysed with method 1 (biotinylated IgG =100 ng/ml).

Long storage

Streptavidin coated wells were maintained for 30 months in a warehouse without air conditioning (temperature range from 10°C to 40 °C ) in comparison with samples stored at 4°C (standard condition ).

The results show the exceptional stability of the coating.

Temperature stress (transport simulation)

Stability was checked under different temperatures as those which may occur during transport.

See stability tests technical notes.

Streptavidin Coated Microplates Available

Streptavidin 96 Well Solid Plates

Streptavidin 96 Well Strip Plates

Streptavidin 96 Wells Breakable Strip Plates

Coating

Streptavidin is coated using 100 µl/tube.

Binding capacity towards biotin

Streptavidin coated PCR 8 strips tubes  were incubated with biotin solutions containing biotinylated peroxidase for 30’ R.T.  After the washing step, the PCR strips tubes  were incubated with TMB and blocked with sulphuric acid 1N. The O.D. values were read at 450 nm

See binding capacity technical note

Streptavidin Coated PCR Products Available

Streptavidin PCR 8 Strip Tubes

Streptavidin PCR plates

Coating

Streptavidin is coated using 500 µl/tube.

Binding capacity towards biotin

Streptavidin coated tubes 12×75 were incubated with biotin solutions (from 0 to 195.2 ng/ml) containing 4 ng/ml of biotinylated peroxidase for 30’ R.T. After the washing step, the streptavidin tubes 12×75 were incubated with TMB and blocked with sulphuric acid 1N. The O.D. values were read at 450 nm.

See binding capacity technical note

Streptavidin Coated 12×75 mm Tubes Available

Streptavidin 12×75 mm Tubes