HAHA ELISA Kit

Catalog No. ABIN1305178

Product Details HAHA ELISA Kit

Target: HAHA (Human Anti-Human Antibody (HAHA))

Reactivity: Human

Detection Method: Colorimetric

Method Type: Sandwich ELISA

Detection Range: 0.1-27 μg/mL

Minimum Detection Limit: 0.1 μg/mL

Application: ELISA

Purpose: This ELISA (enzyme-linked immunosorbent assay) kit is produced for the quantitative determination of human anti-human (IgG) antibody (HAHA) levels in patient serum or plasma samples. It detects both HAHA-IgG and HAHA-IgM subtypes. The test might be used as an aid for detection of patients with positive HAHA that may affect prescribed diagnosis and treatment involving humanized monoclonal antibody.

Brand: ED™

Sample Type: Serum, Plasma

Analytical Method: Quantitative

Characteristics: This HAHA ELISA is a ready-to-use test kit with well-breakable microtiter plate and simple test procedures. It also provides a wide measurement range without high dose hook effect.

Components: 1. Human IgG Coated Microplate
Two vials each containing 0.5mL of a different level of HAHA in a liquid protein matrix with a non-azide based preservative. Refer to vials for exact concentration range for each control.
Both controls should be stored at 2-8 °C and are stable until the expiration date on the kit box.

Material not included: 1. Precision single channel pipettes capable of delivering 25 µL, 50 µL, 100 µL, and 1000 µL etc.
2. Repeating dispenser suitable for delivering 100 µL.3. Disposable pipette tips suitable for above volume dispensing.
4. Disposable 12 x 75 mm or 13 x 100 glass tubes.
5. Disposable plastic 100 mL and 1000 mL bottle with caps.
6. Aluminum foil.
7. Deionized or distilled water.
8. Plastic microtiter well cover or polyethylene film.
9. ELISA multichannel wash bottle or automatic (semi-automatic) washing system.
10. Spectrophotometric microplate reader capable of reading absorbance at 450 nm.

Application Details

Sample Volume: 50 μL

Assay Time: 4 h

Plate: Pre-coated

Protocol: Assay standards, controls and patient samples are directly added to wells of a microplate that is coated with highly purified human IgG. After the first incubation period, the HAHA binds to the human IgG on the wall of microtiter well and unbound proteins in each microtiter well are washed away. Then a horseradish peroxidase (HRP)-labeled human antibody is added to each microtiter well and a sandwich of well coated human IgG HAHA HRP-Conjugated human antibody is formed. The unbound HRP conjugated human antibody is removed in the subsequent washing step. For the detection of this immunocomplex, the well is then incubated with a substrate solution in a timed reaction and then measured in a spectrophotometric microplate reader. The enzymatic activity of the immunocomplex bound to HAHA on the wall of the microtiter well is directly proportional to the amount of HAHA in the sample. A standard curve is generated by plotting the absorbance versus the respective HAHA concentration for each standard on point-to-point or 4 parameter curve fit. The concentration of HAHA in test samples is determined directly from this standard curve.

Reagent Preparation:

(1) Prior to use allow all reagents to come to room temperature. Reagents from different kit lot numbers should not be combined or interchanged.
(2) ELISA Wash Concentrate must be diluted to working solution prior use. Please see REAGENTS section for details.

Sample Collection: Only 50 µL of human serum or plasma is required for HAHA measurement in duplicate. No special preparation of individual is necessary prior to specimen collection. In the case of serum, whole blood should be collected and must be allowed to clot for a minimum of 30 minutes at room temperature before the serum is separated by centrifugation (850 ? 1500xg for 10 minutes). The serum should be separated from the clot within three hours of blood collection and transferred to a clean test tube. Serum or plasma samples should be stored at 2 - 8 C if the assay is to be performed within 72 hours. Otherwise, patient samples should be stored at - 20 °C or below until measurement. Avoid repeated (more than three times) freezing and thawing of specimen.

Assay Procedure:

(1) Place a sufficient number of human IgG coated microwell strips/wells in a holder to run HAHA standards, controls and unknown samples in duplicate.
(2) Test Configuration
(3) Add 25 µL of standards, controls and patient samples into the designated microwell
(4) Add 100 µL of assay buffer to each well
(5) Cover the plate with one plate sealer and incubate plate at room temperature, shaking for 45 minutes.
(6) Prepare HAHA Tracer antibody working solution by 1:21 fold dilution of the HRP-conjugated human antibody with the tracer Antibody Diluent . For each strip, it is required to mix 1 mL of the tracer antibody diluent with 50 µL of the tracer antibody in a clean test tube.
(7) Remove plate sealer. Aspirate the contents of each well. Wash each well 5 times by dispensing 350 µL of working wash solution into each well and then completely aspirating the contents. Alternatively, an automated microplate washer can be used.
(8) Add 100 µL of above diluted HRP-conjugated Human Antibody working solution to each of the wells.
(9) Cover the plate with a plate sealer and an aluminum foil to and incubate plate at room temperature, shaking for 45 minutes.
(10) Remove plate sealer. Aspirate the contents of each well. Wash each well 5 times by dispensing 350 µL of working wash solution into each well and then completely aspirating the contents. Alternatively, an automated microplate washer can be used.
(11) Add 100 µL of ELISA HRP Substrate into each of the wells.
(12) Cover the plate with a plate sealer and also with an aluminum foil to avoid exposure to light. (13) Incubate plate at room temperature for 20 minutes (14) Remove the aluminum foil and plate sealer. Add 100 µL of ELISA Stop Solution into each of the wells. Mix gently. (15) Read the absorbance at 450 nm within 10 minutes in a microplate reader NOTE: to reduce the background, one can set the instrument to dual wavelength measurement at 450 nm with background wavelength correction set at 595 nm or 620 nm or 630 nm.

Calculation of Results:

1. Calculate the average absorbance for each pair of duplicate test results.
   2. Subtract the average absorbance of the STD 1 (0 µg/mL ) from the average absorbance of all other readings to obtain corrected absorbance.
   3. The standard curve is generated by the corrected absorbances of all standard levels on the ordinate against the standard concentration on the abscissa using point-to-point or log-log paper. Appropriate computer assisted data reduction programs may also be used for the calculation of results. We recommend using 4-parameter or Point-to-Point curve fit. The HAHA concentrations for the controls and patient samples are read directly from the standard curve using their respective corrected absorbance.

Assay Precision: The intra-assay precision was validated by measuring one control sample in a single assay with eight replicate determinations. The inter-assay precision is validated by measuring one control sample in duplicate in 6 individual assays.

Restrictions: For Research Use only

Handling

Precaution of Use: The reagents must be used in a professional laboratory environment and are for research use only. Source material (e.g. highly purified bovine serum albumin) of bovine serum was derived in the contiguous 48 United States. It was obtained only from healthy donor animals maintained under veterinary supervision and found free of contagious diseases. Wear gloves while performing this assay and handle these reagents as if they are potentially infectious. Avoid contact with reagents containing TMB, hydrogen peroxide, or sulfuric acid. TMB may cause irritation to skin and mucous membranes and cause an allergic skin reaction. TMB is a suspected carcinogen. Sulfuric acid may cause severe irritation on contact with skin. Do not get in eyes, on skin, or on clothing. Do not ingest or inhale fumes. On contact, flush with copious amounts of water for at least 15 minutes. Use Good Laboratory Practices.

Storage: 4 °C

Target Details for HAHA

Target: HAHA (Human Anti-Human Antibody (HAHA))

Target Type: Antibody

Background: Clinically, humanized monoclonal antibodies (IgG) and their fragments are used in vivo diagnosis procedure (radionuclides) and treatment for patients with various diseases. In patients, even a single dose injection of a humanized monoclonal antibody or its fragment may induce immune response directed against this foreign protein (immunogen). Also, people with autoimmune diseases, such as rheumatoid arthritis, lupus, etc. produce autoantibody against human IgG. In the circulation, the presence of human antibody against human IgG would bind to the injected humanized antibody therapeutics or diagnosis and, therefore, diminish the efficacy of either in-vivo diagnosis or treatment. Especially, the HAHA would increase the risk of anaphylactic complications to subsequent administration of the humanized monoclonal antibody-based therapy. The presence of HAHA in patient serum or plasma specimens may cause both false positive and false negative immunoassay test results depending on assay principles and monoclonal antibodies used in the assay system,