p27 ELISA
Procedure
Dilute p27 monoclonal antibody 1:1000 (v/v) in Carbonate Coating Buffer. Add 100 µl/well and incubate o/n @ 4°C or 1 hr @37°C. Wash 3X with TBST (pour onto plate, empty into sink, hit onto towel 3x to clear wells). Block plate by adding 270 µl/well of BSA/TBS solution. Incubate @37°C for 1 hr. Wash 3x withTBST. Dilute samples and standards in assay buffer and add 100 µl/well (the highest concentration of standards is added to 200 µl then serially diluted in 100 µl assay buffer on the plate). Incubate @ RT for 1 hr while shaking. Meanwhile let TMB solution equilibrate to RT. Wash plate 3x and add 100 µl/well rabbit polyclonal anti-p27 antibody diluted 1:1000 in assay buffer. Incubate 1 hr @ RT with shaking. Wash plate 3x and add 100 µl/well anti-rabbit HRP conjugated antibody diluted 1:1000 in assay buffer. Incubate 1 hr @ RT w/shaking. Wash 3x and add 100 µl/well TMB. Allow to develop w/o shaking for up to 15 min. @ RT. Inactivate TMB with 1 N HCL and read @ A450 with TMB-S program in a plate reader.
Materials
| Carbonate Coating Buffer | TBS | Assay buffer |
| 25 mM sodium bicarbonate | 10 mM Tris, pH 7.4 | PBS |
| 25 mM sodium carbonate | 8 g/L NaCl (137 mM) | 0.1% w/v BSA |
| pH to 9.7 | 0.2 g/L KCL (2.7 mM) | 0.1% v/v Tween-20 (Sigma P7949) |
TBST TBS + 0.05% Tween 20
BSA/TBS TBS + 2% w/v BSA
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