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Natalizumab ELISA Kit

Reactivity: Human, Mouse, Rat Colorimetric Sandwich ELISA 1.56-50 ng/mL Plasma, Serum
Catalog No. ABIN4886394
  • Target
    Natalizumab
    Reactivity
    Human, Mouse, Rat
    Detection Method
    Colorimetric
    Method Type
    Sandwich ELISA
    Detection Range
    1.56-50 ng/mL
    Minimum Detection Limit
    1.56 ng/mL
    Application
    ELISA
    Purpose
    Quantification of Natalizumab in biological matrices
    Sample Type
    Plasma, Serum
    Analytical Method
    Quantitative
    Specificity
    Natalizumab (Tysabri)
    Cross-Reactivity (Details)
    Human IgG1 and rituximab prepared at 250 ng/mL were assayed
    Sensitivity
    1.5 ng/mL
    Components
    Coated microtiter plate, 96 wells
    Calibrator diluent. - 1.8ml
    Calibrator 12ul
    10X wash buffer - 25ml
    Assay buffer - 50ml
    1000X detection reagent - 17ul
    TMB - 12ml
    TMB stop solution - 12ml
    Plate sealers - 3
    Material not included
    Precision pipettes calibrated to deliver 5-1000μL
    Multi-channel pipette calibrated to deliver 50-200μL
    Plate shaker
    Disposable tips
    Vortex-Mixer
    Distilled or de-ionized water
    Microplate reader capable of reading 450nm with background subtrac
  • Application Notes
    Optimal working dilution should be determined by the investigator.
    Sample Volume
    15 μL
    Assay Time
    2.5 h
    Plate
    Pre-coated
    Protocol
    The Natalizumab ELISA kit is designed to measure free Natalizumab with high specificity and sensitivity . This assay employs the sandwich enzyme immunoassay technique. A precoated anti-Natalizumab 96 well plate is provided. Calibrator, quality control samples and test samples are pipetted into the appropriate wells. Natalizumab present in biological matrices is bound by the immobilized capture antibody. After washing away any unbound substances, enzyme linked detection antibody is added to the wells. The plate is washed to remove any unbound antibody-enzyme reagent and a substrate solution is added to the wells for color development. The color development is proportional to the amount of Natalizumab present in test samples and the concentration is calculated from the standard series.
    Reagent Preparation

    Prepare only the appropriate amount of required reagent on the day of use. Store all reagents as per instructions stated on the label. 1. Wash Buffer (1X) Preparation: Dilute wash buffer concentrate with ultra-pure water 1/10 before use (for example add 20 mL concentrate to 180 mL ultra-pure water). Mix well. 2. Detection Reagent (1X) Preparation: Dilute detection reagent with assay buffer 1/1000 before use (for example add 11 μL concentrate to 11 mL of assay buffer). Mix well. 3. Preparation of Calibrators: Prepare calibrators with concentrations ranging from 2500 ng/mL to 78 ng/mL. The following is an example calibrator curve.

    Sample Collection
    This kit is compatible with EDTA-plasma, heparinplasma and serum samples. Samples can be stored at or below -20 °C for up to 1 year.
    Sample Preparation

    Dilute calibrators and test samples 1/50 with assay buffer (for example add 5μL of prepared calibrator or sample to 245μL of assay buffer). Mix well. Do not store diluted samples.

    Assay Procedure

    This assay employs the sandwich enzyme immunoassay technique. Capture antibody is coated onto a 96 well microplate. Calibrator and test samples are pipetted into the appropriate wells. Natalizumab present in biological matrices is bound by the immobilized anti-Natalizumab antibody. After washing away any unbound substances, enzyme linked anti-Natalizumab antibody is added to the wells. The plate is washed to remove any unbound antibody-enzyme reagent and a substrate solution is added to the wells for color development. The color development is proportional to the amount of Natalizumab present in test samples. The color development is stopped and the intensity of the color is measured.

    Calculation of Results
    1. Construct a standard curve by plotting the absorbance obtained from each standard against concentration. Use a 4 or 5 parameter curve fit. Alternatively a log-log curve fit may be used. 2. The concentration of the unknowns can be read directly from this standard curve using the absorbance value for each sample. 3. Any sample undiluted or diluted still reading greater than the highest standard should be diluted appropriately with calibrator diluent and retested. If the samples have been diluted, the concentration determined from the standard curve must be multiplied by the dilution factor.
    Assay Precision
    Precision: The precision was determined by analyzing samples prepared at 625 ng/mL in 6 replicates on 6 different occasions. Intra-assay coefficient of variation (CV) < 10%. Inter-assay CV < 10%.

    Recovery: 250 ng/mL of Natalizumab was spiked in 10 lots of human serum. Recovery ranges are from 90-108% with an average recovery of 96%.
    Restrictions
    For Research Use only
  • Preservative
    Without preservative
    Precaution of Use
    Read manual completely before beginning
    Storage
    -20 °C
    Storage Comment
    Store kit components at -20°C unless specified otherwise. DO NOT USE past kit expiration date. Some vials contain a small amount of reagents. Spin tubes on pulse setting prior to opening.
    Expiry Date
    12 months
  • Target
    Natalizumab
    Target Type
    Antibody
    Background
    Natalizumab (Tysabri®) is a humanized monoclonal antibody against the cell adhesion molecule α4-integrin used in the treatment of multiple sclerosis and Crohn's disease. Tysabri® and was previously named Antegren®. Natalizumab is administered by intravenous infusion every 28 days and reduces the ability of inflammatory immune cells to attach to and pass through the cell layers lining the intestines and blood- brain barrier.
    Gene ID
    1956
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