Tocilizumab Antibody Kit ELISA

N° du produit ABIN2862665

Détail du produit

Antigène: Tocilizumab Antibody

Épitope: Free Chain

Reactivité: Chemical, Humain

Méthode de détection: Colorimetric

Type de méthode: Sandwich ELISA

Application: ELISA

Fonction: Enzyme immunoassay for the semi-quantitative determination of free antibodies to Tocilizumab in human serum and plasma samples.

Marque: ImmunoGuide®

Type d'échantillon: Serum, Plasma (EDTA - heparin)

Analytical Method: Semi-Quantitative

Specificité: Free antibodies against Tocilizumab (RoActemra®, Actemra®)S creening test was performed with 92 different native and RF-negative human sera. All produced OD450nm values (ranged from 0.047 to 0.094) less than the cut-off value (3x0.060).

Sensibilité: 10 ng/mL

Attributs du produit: This test does not measure the antibodies if they already are bound to the drug Tocilizumab

Ingrédients:

• 1 x 12 x 8 Microtiter Plate Break apart strips pre-coated with the drug Tocilizumab.
• 1 x 2 mL Positive Control Ready to use. Contains reactive antibody, proteins, stabilizer and <15mM NaN3.
• 1 x 2 mL Negative Control Ready to use. Contains human serum, stabilizer and <15mM NaN3.
• 1 x 60 mL Assay Buffer Blue colored. Ready to use. Contains proteins and <15mM NaN3.
• 1 x 12 mL Enzyme Conjugate Red colored. Ready to use. Contains horseradish peroxidase(HRP)-conjugated Tocilizumab, Proclin ® and stabilizers.
• 1 x 12 mL TMB Substrate Solution Ready to use. Contains 3,3',5,5'-Tetramethylbenzidine (TMB).
• 1 x 12 mL Stop Solution Ready to use. 1 N Hydrochloric acid (HCl).
• 1 x 50 mL Wash Buffer, Concentrate (20x) Contains buffer, Tween ® 20 and Kathon TM .
• 2 x 1 Adhesive Seal For sealing microtiter plate during incubation.

Matériel non inclus:

• Micropipettes (< 3 % CV) and tips to deliver 5-1000 μL.
• Bidistilled or deionised water and calibrated glasswares (e.g. flasks or cylinders).
• Wash bottle, automated or semi-automated microtiter plate washing system.
• Microtiter plate reader capable of reading absorbance at 450 nm (reference wavelength at 600-650 nm is optional).
• Absorbent paper towels, standard laboratory glass or plastic vials, and a timer.

Information d'application

Indications d'application:

• Before performing the assay, samples and assay kit should be brought to room temperature (about 30 minutes beforehand) and ensure the homogeneity of the solution.
• All Standards should be run with each series of unknown samples.
• Standards should be subject to the same manipulations and incubation times as the samples being tested.
• All steps of the test should be completed without interruption.
• Use new disposable plastic pipette tips for each reagent, standard or specimen in order to avoid cross contamination.

Commentaires:

Antibody to Tocilizumab ELISA is also suitable for using by an automated ELISA processor.

Volume d'échantillon: 5 μL

Durée du test: 2.5 h

Plaque: Pre-coated

Protocole: The Antibody to Tocilizumab ELISA is a sandwich type ELISA for the determination of free antibodies against Tocilizumab in serum and plasma samples. During the first incubation period, antibodies to Tocilizumab in patient serum/plasma samples are captured by the drug Tocilizumab coated on the wall of the microtiter wells. After washing away the unbound components from samples, a peroxidase-labelled Tocilizumab conjugate is added and then incubated. Antibody to Tocilizumab, if present in sample, will make a bridge, with its two identical Fab arms, between the Tocilizumab coated on the well and the other Tocilizumab labeled with peroxidase. After a second washing step, the bound enzymatic activity is detected by addition of tetramethylbenzidine (TMB) chromogen-substrate. Finally, the reaction is terminated with stop solution. The positive reaction is related to the presence of antibodies to Tocilizumab in the sample.

Préparation des réactifs:

Wash Buffer: Dilute 10 mL Wash Buffer (up to 200 mL) at the ratio of 1:20 with distilled water.
Warm up at 37 °C to dissolve crystals. Mix vigorously.
Store at 2-8 °C for up to 4 weeks.
Prepare Wash Buffer before starting the assay procedure.

Prélèvement de l'échantillon: Normal serum or plasma collection

Préparation de l'échantillon:

Serum/ Plasma: Dilute Serum/ Plasma (Sample) at the ratio of 1:101 with Assay Buffer.
For dilution at 1:101, 5 μL Sample + 500 μL Assay Buffer
Negative and Positive Controls are ready-to-use and should NOT be diluted with the assay buffer.

Serum, Plasma (EDTA, Heparin): The usual precautions for venipuncture should be observed. It is important to preserve the chemical integrity of a blood specimen from the moment it is collected until it is assayed. Do not use grossly hemolytic, icteric or grossly lipemic specimens. Samples appearing turbid should be centrifuged before testing to remove any particulate material.

Storage: 2-8 °C &leq,-20 °C (Aliquots)
Keep away from heat or direct sun light.
Avoid repeated freeze-thaw cycles.
Stability: 3 days at 2-8 °C, 6 months at -20 °C

Procédure de l'essai:

1. Pipette 100 μL of each Ready-to Use Negative Control, Positive Control, and 1:101 Diluted Samples (as described in section 10.2) into the respective wells of microtiter plate. Wells A1: Negative Control B1: Negative Control C1: Positive Control D1 and so on: Diluted samples (Serum/Plasma)
2. Cover the plate with adhesive seal. Shake plate carefully. Incubate 60 min at room temperature (RT) (18-25 °C).
3. Remove adhesive seal. Aspirate or decant the incubation solution. Wash the plate 3 X 300 μL of Diluted Wash Buffer per well. Remove excess solution by tapping the inverted plate on a paper towel.
4. Pipette 100 μL of Enzyme Conjugate (HRP-Tocilizumab) into each well.
5. Cover plate with adhesive seal. Shake plate carefully. Incubate 60 min at RT.
6. Remove adhesive seal. Aspirate or decant the incubation solution. Wash the plate 3 X 300 μL of Diluted Wash Buffer per well. Remove excess solution by tapping the inverted plate on a paper towel.
7. Pipette 100 μL of Ready-to-Use TMB Substrate Solution into each well.
8. Incubate 20 min at RT. Avoid exposure to direct sunlight..
9. Stop the substrate reaction by adding 100 μL of Stop Solution into each well. Briefly mix contents by gently shaking the plate. Color changes from blue to yellow.
10. Measure optical density (OD) with a photometer at 450 nm (Reference at OD620nm is optional) within 15 min after pipetting the Stop Solution.

Calcul des résultats:

For the run to be valid, the OD450 nm of the Positive Control should be ≥ 1.00 and the OD450 nm of each Negative Control should be ≤0.150. If not, improper technique or reagent deterioration may be suspected and the run should be repeated. The results are evaluated by dividing all individual results by the mean OD450nm of the Negative Controls. The results are expressed in arbitrary units (AU/mL).

Range: > 3 AU/mL (Positive)
Range: &leq, 3 AU/mL (Negative)

The results themselves should not be the only reason for any therapeutical consequences. They have to be correlated to other clinical observations.

Précision du teste: Intra-assay CV: <10%.
Inter-assay CV: <10%

Restrictions: For Research Use only

Stockage

Buffer: < 15mM NaN3

Agent conservateur: Sodium azide

Précaution d'utilisation: This product contains Sodium azide: a POISONOUS AND HAZARDOUS SUBSTANCE which should be handled by trained staff only.

Stock: 4 °C

Stockage commentaire: The kit is shipped at ambient temperature and should be stored at 2-8°C.
Keep away from heat or direct sun light.
The storage and stability of specimen and prepared reagents is stated in the corresponding chapters.
The microtiter strips are stable up to the expiry date of the kit in the broken, but tightly closed bag when stored at 2-8°C.

Date de péremption: 24 months

Détail du antigène

Antigène: Tocilizumab Antibody

Classe de substances: Antibody

Sujet: Tocilizumab is a humanized monoclonal antibody (mAb) that specifically targets both soluble interleukin-6 receptor (sIL-6R) and membrane bound interleukin-6 receptor (mIL-6R) with a high affinity, thereby preventing pro-inflammatory effects of IL-6. To present, the application of Tocilizumab is licensed for the treatment of RA, systemic juvenile idiopathic arthritis (sJIA) and Castleman's disease and represents a favorable efficacy in these diseases. In the 24 week, controlled clinical studies, a total of 2876 patients have been tested for anti-Tocilizumab antibodies. Forty-six patients (2 % ) developed positive anti-Tocilizumab antibodies, of whom 5 had an associated, medically significant, hypersensitivity reaction leading to withdrawal. Thirty patients (1 %) developed neutralizing antibodies. The data reflect the percentage of patients whose test results were positive for antibodies to Tocilizumab in specific assays. The Antibody to Tocilizumab ELISA Kit can be efficiently used for monitoring Anti-Tocilizumab antibodies during therapy and offers the clinician a tool for decision on possible preventive measures to reduce Anti- Tocilizumab antibodies.

Poids moléculaire: 144 kDa