DiaPharma Group, Inc.

For Research Use Only. Not For Use In Diagnostic Procedures.

1. Capture Antibody (FXII-EIA-C): One yellow-capped vial containing 0.5 ml of polyclonal affinity purified anti-FXII antibody for coating plates.
2. Detecting Antibody (FXII-EIA-D): One red-capped vial containing 0.5 ml of peroxidase conjugated polyclonal anti-FXII antibody for detection of captured F.XII.

Note: Antibodies are supplied in a 50% (v/v) glycerol solution for storage at -10 to -20°C. Keep vials tightly capped. Do not store in frost-free freezers.

Principle of Sandwich-style ELISA

Affinity-purified antibody to FXII is coated onto the wells of a microtitre plate. Any remaining binding sites on the plastic wells are blocked with an excess of bovine serum albumin. The plates are washed and plasma or other fluids containing FXII are applied. The coated antibody will capture the FXII in the sample. After washing the plate to remove unbound material, a peroxidase conjugated second antibody to FXII is added to the plate to bind to the captured FXII. After washing the plate to remove unbound conjugated antibody, the peroxidase activity is expressed by incubation with o-phenylenediamine (OPD). After a fixed development time the reaction is quenched with the addition of H2SO4 and the color produced is quantified using a microplate reader. The color generated is proportional to the concentration of FXII present in the sample.

Assay Procedure:

1. Coating of plates: Dilute the capture antibody 1/100 in coating buffer (preferably in a polypropylene tube) and immediately add 100 microliters to every well in the plate. Incubate overnight @ 2-8°C or for 2 hours @ 22°C.
2. Blocking: Empty contents of plate and add 150 μl of blocking buffer to every well and incubate for 90 minutes @ 22°C. Wash plate X 3 with wash buffer.
3. Samples: Reference plasma is diluted 1/500 (100%) then serial 1/2's down to 1/16000 (3.13%). Sample plasmas are diluted 1/1000, 1/2000 & 1/4000. All dilutions are made in HBS-BSA-T20 sample diluent. Apply 100 microliters/well and incubate plate @ 22°C for 60 minutes. Wash plate X 3 with wash buffer.
4. Detecting Antibody: Dilute the detecting antibody 1/100 in HBS-BSA-T20 sample diluent and apply 100 microliters to each well. Incubate plate @ 22°C for 60 minutes. Wash plate X 3 with wash buffer.
5. OPD Substrate: Apply 100 microliters of freshly prepared OPD substrate to every well. Allow color to develop for 5-10 minutes then stop color reaction with the addition of 50 microliters/well of 2.5 M H2SO4. The plate can be read at a wavelength of 490 nm.

Related Products:

• GAFXII-IG - Goat anti-human FXII, whole IgG from antiserum
• GAFXII-AP - Goat anti-human FXII, affinity purified IgG
• GAFXII-HRP - Goat anti-human FXII, IgG-peroxidase conjugate
• SAFXII-IG - Sheep anti-human FXII, whole IgG from antiserum
• SAFXII-AP - Sheep anti-human FXII, affinity purified IgG
• FXII-DP - Plasma deficient in FXII, immune-depleted