C3 ELISA Kit (Complement Component 3)

Details for Product C3 ELISA Kit No. ABIN612675, Supplier: Log in to see
  • C3
  • C3-1
  • sb:cb26
  • si:dkey-76b14.4
  • wu:fi34b03
  • wu:fj86e11
  • asp
  • cpamd1
  • AI255234
  • ASP
  • Plp
  • AHUS5
  • ARMD9
  • C3a
  • C3b
  • CPAMD1
  • C3d
  • c3
  • c3_D
  • complement component c3a
  • complement component 3
  • complement C3-like
  • complement component C3
  • endogenous retrovirus group K, member 13
  • c3a
  • C3
  • c3
  • LOC100060539
  • c3-1
  • ERVK-13
Human C3 ELISA Kit
Kits with alternative reactivity to:
Method Type
Competition ELISA
Minimum Detection Limit
0.5 µg/mL
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Supplier Product No.
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Purpose The AssayMax Human Complement C3 ELISA (Enzyme-Linked Immunosorbent Assay) kit is designed for detection of human complement C3 in plasma, serum and cell culture supernatants
Brand AssayMax
Sample Type Plasma, Cell Culture Supernatant
Analytical Method Quantitative
Detection Method Colorimetric
Cross-Reactivity (Details) No significant cross-reactivity or interference was observed.
Components Human Complement C3 Microplate: A 96-well polystyrene microplate (12 strips of 8 wells) coated with a polyclonal antibody against human complement C3. 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 C3 Standard: Human Complement C3 in a buffered protein base (30 µg, lyophilized). Biotinylated Complement C3: 1 vial, lyophilized. EIA Diluent Concentrate (10x): A 10-fold concentrated buffered protein base (30 ml). 1 Wash Buffer Concentrate (20x): A 20-fold concentrated buffered surfactant (30 ml). Streptavidin-Peroxidase Conjugate (SP Conjugate): A 100-fold concentrate (80µl). 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
Alternative Name Complement C3 (C3 ELISA Kit Abstract)
Background Complement protein C3 is the fourth component to attach in the complement reaction sequence. It is a beta-globulin with a sedimentation coefficient of 5.5 and a molecular weight of 185,000. Complement C3 is a central molecule in the complement system whose activation is essential for all the important functions performed by this system. Complement C3 can promote phagocytosis during an inflammatory response against pathogens, but unregulated activation of complement C3 could lead to host cell damage. Low levels of serum complement C3 associates with hypocomplementaemia , primary biliary cirrhosis.
Research Area Complement Factors
Pathways Complement System, Regulation of Leukocyte Mediated Immunity, Positive Regulation of Immune Effector Process, Regulation of G-Protein Coupled Receptor Protein Signaling
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 C3 in less than 3 hours. A polyclonal antibody specific for human complement C3 has been pre-coated onto a 96-well microplate with removable strips. Complement C3 in standards and samples is competed by a biotinylated complement C3 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. EIA Diluent Concentrate (10x): Dilute the EIA Diluent 1:10 with reagent grade water. Store for up to 1 month at 2-8°C. Standard Curve: Reconstitute the 30 g of Complement C3 Standard with 1 ml of EIA Diluent to generate a solution of 30 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 standard solution (30 g/ml) 1:2 with EIA Diluent to produce 15, 7.5, 3.75, 1.88, 0.94 and 0.47 g/ml solutions. EIA Diluent serves as the zero standard (0 g/ml). Any remaining solution should be frozen at -20°C. Standard Point Dilution [Complement C3] ( g/ml) Standard (30 g/ml) P1 30.000 P2 1 part P1 + 1 part EIA Diluent 15.000 P3 1 part P2 + 1 part EIA Diluent 7.50 P4 1 part P3 + 1 part EIA Diluent 3.75 P5 1 part P4 + 1 part EIA Diluent 1.88 P6 1 part P5 + 1 part EIA Diluent 0.94 P7 1 part P6 + 1 part EIA Diluent 0.47 P8 EIA Diluent 0.00 Biotinylated Complement C3 (2x): Dilute Biotinylated Complement C3 with 4 ml EIA 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 EIA 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 EIA 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 EIA Diluent. The undiluted samples can be stored at -20°C or below for up to 3 months. Avoid repeated freeze-thaw cycles (EDTA or Heparin can also be used as anticoagulant). Serum: Samples should be collected into a serum separator tube. After clot formation, centrifuge samples at 2000 x g for 10 minutes. Remove serum and assay. Dilute samples 1:800 into EIA Diluent. The undiluted samples can be stored at -20°C or below for up to 3 months. Avoid repeated freeze-thaw cycles.
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 C3 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 8 minutes or until 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 duplicate or 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 4.5 % and 7.4 % respectively.
Restrictions For Research Use only
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 EIA 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.
Supplier Images
ELISA image for Complement Component 3 (C3) ELISA Kit (ABIN612675) Complement Component 3 (C3) ELISA Kit
Product cited in: Yang, Tsai, Chang, Chuang, Hsu, Chiang: "The interaction between circulating complement proteins and cutaneous microvascular endothelial cells in the development of childhood Henoch-Schönlein Purpura." in: PLoS ONE, Vol. 10, Issue 3, pp. e0120411, 2015 (PubMed).

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).

Background publications Stokowska, Olsson, Holmegaard, Jood, Blomstrand, Jern, Pekna: "Plasma C3 and C3a levels in cryptogenic and large-vessel disease stroke: associations with outcome." in: Cerebrovascular diseases (Basel, Switzerland), Vol. 32, Issue 2, pp. 114-22, 2011 (PubMed).

Ram, Lewis, Rice: "Infections of people with complement deficiencies and patients who have undergone splenectomy." in: Clinical microbiology reviews, Vol. 23, Issue 4, pp. 740-80, 2010 (PubMed).

Wiesmann, Katschke, Yin, Helmy, Steffek, Fairbrother, McCallum, Embuscado, DeForge, Hass, van Lookeren Campagne: "Structure of C3b in complex with CRIg gives insights into regulation of complement activation." in: Nature, Vol. 444, Issue 7116, pp. 217-20, 2006 (PubMed).

Janssen, Christodoulidou, McCarthy, Lambris, Gros: "Structure of C3b reveals conformational changes that underlie complement activity." in: Nature, Vol. 444, Issue 7116, pp. 213-6, 2006 (PubMed).

de Bruijn, Fey: "Human complement component C3: cDNA coding sequence and derived primary structure." in: Proceedings of the National Academy of Sciences of the United States of America, Vol. 82, Issue 3, pp. 708-12, 1985 (PubMed).

Morris, Goldberger, Colten, Aden, Knowles: "Biosynthesis and processing of a human precursor complement protein, pro-C3, in a hepatoma-derived cell line." in: Science (New York, N.Y.), Vol. 215, Issue 4531, pp. 399-400, 1982 (PubMed).

Hugli: "Human anaphylatoxin (C3a) from the third component of complement. Primary structure." in: The Journal of biological chemistry, Vol. 250, Issue 21, pp. 8293-301, 1976 (PubMed).

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