Complement C4 ELISA Kit

Catalog No. ABIN612676

Product Details Complement C4 ELISA Kit

Target: Complement C4 (C4) (Complement 4 (C4))

Reactivity: Human

Detection Method: Colorimetric

Method Type: Competition ELISA

Minimum Detection Limit: 300 ng/mL

Application: ELISA

Purpose: The AssayMax Human complement C4 ELISA (Enzyme-Linked Immunosorbent Assay) kit is designed for detection of human complement C4 in plasma and serum

Brand: AssayMax

Sample Type: Plasma

Analytical Method: Quantitative

Cross-Reactivity (Details): No significant cross-reactivity or interference was observed.

Components: Human Complement C4 Microplate: A 96-well polystyrene microplate (12 strips of 8 wells) coated with a polyclonal antibody against human complement C4. Sealing Tapes: Each kit contains 3 pre-cut, pressure-sensitive sealing tapes that can be cut to fit the format of the individual assay. Human Complement C4 Standard: Human Complement C4 in a buffered protein base (7.5 µg, lyophilized). Biotinylated Complement C4: 1 vial, lyophilized. MIx Diluent Concentrate (10x): A 10-fold concentrated buffered protein base (30 ml). Wash Buffer Concentrate (20x): A 20-fold concentrated buffered surfactant (30 ml, 2 bottles). Streptavidin-Peroxidase Conjugate (SP Conjugate): A 100-fold concentrate (80µl). 1 Chromogen Substrate: A ready-to-use stabilized peroxidase chromogen substrate tetramethylbenzidine (8 ml). Stop Solution: A 0.5 N hydrochloric acid to stop the chromogen substrate reaction (12 ml).

Material not included: Microplate reader capable of measuring absorbance at 450 nm. Pipettes (1-20 µL, 20-200 µL, 200-1000µLand multiple channel). Deionized or distilled reagent grade water.

Application Details

Sample Volume: 25 μL

Assay Time: < 3 h

Plate: Pre-coated

Protocol: This assay employs a quantitative competitive enzyme immunoassay technique that measures human complement C4 in less than 3 hours. A polyclonal antibody specific for human complement C4 has been pre-coated onto a 96-well microplate with removable strips. Complement C4 in standards and samples is competed by a biotinylated complement C4 sandwiched by the immobilized antibody and streptavidin-peroxidase conjugate. All unbound material is then washed away and a peroxidase enzyme substrate is added. The color development is stopped and the intensity of the color is measured.

Reagent Preparation:

Freshly dilute all reagents and bring all reagents to room temperature before use. If crystals have formed in the concentrate, mix gently until the crystals have completely dissolved. MIx Diluent Concentrate (10x): Dilute the MIx Diluent 1:10 with reagent grade water. Store for up to 1 month at 2-8°C. Standard Curve: Reconstitute the 7.5 g of complement C4 Standard with 1.5 ml of MIx Diluent to generate a stock solution of 5 g/ml. Allow the standard to sit for 10 minutes with gentle agitation prior to making dilutions. Prepare duplicate or triplicate standard points by serially diluting the stock solution (5 g/ml) 1:2 with MIx Diluent to produce 2.5, 1.25, 0.625 and 0.313 g/ml solutions. MIx Diluent serves as the zero standard (0 g/ml). Any remaining solution should be frozen at -20°C. Standard Point Dilution [Complement C4] ( g/ml) Standard Stock (5 g/ml) P1 5.000 P2 1 part P1 + 1 part MIx Diluent 2.500 P3 1 part P2 + 1 part MIx Diluent 1.250 P4 1 part P3 + 1 part MIx Diluent 0.625 P5 1 part P4 + 1 part MIx Diluent 0.313 P6 MIx Diluent 0.000 2 Biotinylated Complement C4 (2x): Dilute Biotinylated complement C4 with 4 ml MIx Diluent to produce a 2-fold stock solution. Allow the biotin to sit for 10 minutes with gentle agitation prior to making dilutions. The stock solution should be further diluted 1:2 with MIx Diluent. Any remaining solution should be frozen at -20°C. Wash Buffer Concentrate (20x): Dilute the Wash Buffer Concentrate 1:20 with reagent grade water. SP Conjugate (100x): Spin down the SP Conjugate briefly and dilute the desired amount of the conjugate 1:100 with MIx Diluent. Any remaining solution should be frozen at -20°C.

Sample Collection: Plasma: Collect plasma using one-tenth volume of 0.1 M sodium citrate as an anticoagulant. Centrifuge samples at 2000 x g for 10 minutes and assay. Dilute samples 1:800 into MIx Diluent. The undiluted samples can be stored at

Assay Procedure:

Prepare all reagents, working standards and samples as instructed. Bring all reagents to room temperature before use. The assay is performed at room temperature (20 - 30 °C). Remove excess microplate strips from the plate frame and return them immediately to the foil pouch with desiccant inside. Reseal the pouch securely to minimize exposure to water vapor and store in a vacuum desiccator. Add 25 µL of standard or sample per well, and immediately add 25 µL of Biotinylated Complement C4 to each well (on top of the Standard or sample) and mix gently. Cover wells with a sealing tape and incubate for two hours. Start the timer after the last sample addition. Wash five times with 200 µL of Wash Buffer manually. Invert the plate each time and decant the contents, hit it 4-5 times on absorbent paper towel to completely remove the liquid. If using a machine wash six times with 300 µL of Wash Buffer and then invert the plate, decant the contents, hit it 4-5 times on absorbent paper towel to completely remove the liquid. Add 50 µL of Streptavidin-Peroxidase Conjugate to each well and incubate for 30 minutes. Turn on the microplate reader and set up the program in advance. Wash a microplate as described above. Add 50 µL of Chromogen Substrate per well and incubate for about 10 minutes or till the optimal blue color density develops. Gently tap plate to ensure thorough mixing and break the bubbles in the well with pipette tip. Add 50 µL of Stop Solution to each well. The color will change from blue to yellow. Read the absorbance on a microplate reader at a wavelength of 450 nm immediately. If wavelength correction is available, subtract readings at 570 nm from those at 450 nm to correct optical imperfections. Otherwise, read the plate at 450 nm only. Please note that some unstable black particles may be generated at high concentration points after stopping the reaction for about 10 minutes, which will reduce the readings.

Calculation of Results:

Calculate the mean value of the triplicate readings for each standard and sample. To generate a Standard Curve, plot the graph using the standard concentrations on the x-axis and the corresponding mean 450 nm absorbance on the y-axis. The best-fit line can be determined by regression analysis using log-log or four-parameter logistic curve-fit. Determine the unknown sample concentration from the Standard Curve and multiply the value by the dilution factor. Standard Curve The curve is provided for illustration only. A standard curve should be generated each time the assay is performed.

Assay Precision: Intra-assay and inter-assay coefficients of variation were 4.8 % and 7.5 % respectively.

Restrictions: For Research Use only

Handling

Handling Advice: The kit should not be used beyond the expiration date.

Storage: 4 °C/-20 °C

Storage Comment: Store kit at 2-8°C or -20°C upon arrival up to the expiration date. Opened MIx Diluent may be stored for up to 1 month at 2-8°C. Store reconstituted reagents at -20°C or below. Opened unused strip wells may return to the foil pouch with the desiccant pack, reseal along zip-seal. May be stored for up to 1 month in a vacuum desiccator.

References for Complement C4 ELISA Kit (ABIN612676)

Sei, Mizuno, Suzuki, Imai, Higashide, Harris, Sakata, Iguchi, Fujiwara, Kodera, Maruyama, Matsuo, Ito: "Expression of membrane complement regulators, CD46, CD55 and CD59, in mesothelial cells of patients on peritoneal dialysis therapy." in: Molecular immunology, Vol. 65, Issue 2, pp. 302-9, (2015) (PubMed).

Target Details for Complement C4

Target: Complement C4 (C4) (Complement 4 (C4))

Alternative Name: Complement C4 (C4 Products)

Synonyms: C4B1 ELISA Kit, C4B12 ELISA Kit, C4B2 ELISA Kit, C4B3 ELISA Kit, C4B5 ELISA Kit, C4BD ELISA Kit, C4B_2 ELISA Kit, C4F ELISA Kit, CH ELISA Kit, CO4 ELISA Kit, CPAMD3 ELISA Kit, C4 ELISA Kit, C4A2 ELISA Kit, C4A3 ELISA Kit, C4A4 ELISA Kit, C4A6 ELISA Kit, C4AD ELISA Kit, C4S ELISA Kit, CPAMD2 ELISA Kit, RG ELISA Kit, C4-1 ELISA Kit, C4b ELISA Kit, C4-2 ELISA Kit, Slp ELISA Kit, Ss ELISA Kit, complement C4B (Chido blood group) ELISA Kit, complement C4A (Rodgers blood group) ELISA Kit, complement component 4A (Rodgers blood group) ELISA Kit, complement 4 ELISA Kit, complement component 4A ELISA Kit, complement component 4B (Chido blood group) ELISA Kit, C4B ELISA Kit, C4A ELISA Kit, C4a ELISA Kit, C4 ELISA Kit, C4b ELISA Kit

Background: Complement protein C4 is the second component to react in the complement sequence. It is a beta- globulin with a sedimentation coefficient of 18.7 and a molecular weight of 240,000. The C4 component participates in the initial step of activation of classical complement pathway. Lower levels of complement C4 in serum was associated with primary biliary cirrhosis , human systemic lupus erythematosus , and chronic liver disease.

Pathways: Complement System