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Mouse IgE ELISA Protocol
Coat with Capture Antibody
- Shake plate to ensure all wells are covered by capture antibody solution.
- Cover the plate and incubate for 1 hour at 37°C or overnight at 4°C.
- Wash the plate 3X with PBS/Tween®*. For each wash, wells are filled with 200 µl PBS/Tween ® and allowed to stand at least 1 min prior to aspirating or dumping. As a final step, tap plate on paper towels to remove excess buffer.
Blocking
- Block the plate with 200 µl blocking buffer* per well.
- Cover the plate and incubate at RT for 30 min.
- Wash the plate 3X with PBS/Tween ®, as in Section I, Step 4, of this protocol.
Apply Standards and Samples
- Leave column 1 as blank wells (i.e., no antigen added, 100 µl per well blocking buffer only). Use columns 2 and 3 for duplicates of the standard, 100 µl per well: dilute purified mouse IgE a standard (cat. no. 557079, clone C38-2; or cat. no. 553481, clone 27-74) or mouse IgE a standard (cat. no. 557080, clone C48-2) in a series of 8 two-fold dilutions, in blocking buffer, starting at 0.5 µg/ml. Use the remaining columns to add samples at various dilutions in blocking buffer, 100 µl per well.
- Cover the plate and incubate for at least 1 hour at RT or overnight at 4°C. b
- Wash the plate 3X with PBS/Tween®, as in Section I, Step 4, of this protocol.
Incubation with Detection Antibody:
- Dilute biotinylated anti-mouse IgE (cat. no. 553419, clone R35-118) to 2 µg/ml a in blocking buffer. Add 100 µl per well.
- Cover the plate and incubate at RT for 1 hour.
- Wash the plate 6X with PBS/Tween®, as in Section I, Step 4, of this protocol.
Add Streptavidin-Horseradish Peroxidase (SAv-HRP):
- Dilute Avidin-HRP (cat. no. 554058) or Streptavidin-HRP (cat. no. 554066) 1:1000 in blocking buffer c . Add 100 µl per well.
- Cover the plate and incubate at RT for 30 min.
- Wash the plate 6X with PBS/Tween® , as in Section I, Step 4, of this protocol.
Add Substrate and Develop:
- Thaw substrate (ABTS) buffer* within 20 min of use. Add 11 µl of 30% H 2 O 2 (Sigma, Cat. No. H1009) to 11 ml substrate buffer and vortex. Immediately add 100 µl per well and allow to develop at RT for 20-30 min. Color reaction can be stopped by adding 50 µl per well of SDS/DMF Solution* (optional).
- Read the plate at 405 nm.
Solutions:
Coating Buffer : PBS, pH 7.2 - 7.4
PBS/Tween ® : PBS pH 7.2-7.4, Tween ® -20, 0.05%
Substrate Buffer :
ABTS (3-ethylbenzthiazoline-6-sulfonic acid, Sigma Cat. No. A-1888), 150 mg
0.1 M citric acid (e.g., Fisher anhydrous, Cat. No. A-940), 500 ml
Adjust pH to 4.35 with NaOH pellets
Aliquot at 11 ml per vial and store at -20°C
SDS/DMF Solution :
40% SDS (80 g SDS in 200 ml dd H 2 O)
Add 200 ml DMF (N.N-dimethyl formamide)
PBS Solution :
NaCl, 80.0 g
Na 2 HPO 4 , 11.6 g
KH 2 PO 4 , 2.0 g
KCl, 2.0 g
Add H 2 O to 10 liter
Adjust pH to 7.2 - 7.4
Blocking Buffer :
PBS, pH to 7.2 - 7.4
10% Fetal calf serum or 1% BSA
Notes
- In most cases, coating the plate with primary mAb at 2 µg/ml, 100 µl per well and detecting with the biotinylated secondary mAb at 2 µg/ml, 100 µl per well yields a very satisfactory signal. However, for optimal signal, researchers should titrate each mAb over a range of concentrations (e.g., 1 - 8 µg/ml).
- Recommended incubation times for optimal sensitivity.
- Streptavidin/Avidin-HRP conjugate from another supplier may be substituted and diluted according to the manufacturer's recommendation.
For troubleshooting information and details on ELISA techniques, please visit the page.
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