Human C-Peptide Quantikine ELISA Kit

  • Assay Type
    Solid Phase Sandwich ELISA
  • Format
    96-well strip plate
  • Assay Length
    2.5 hours
  • Sample Type & Volume Required Per Well
    Cell Culture Supernates (100 uL), Serum (50 uL), EDTA Plasma (50 uL), Heparin Plasma (50 uL), Urine (10 uL)
  • Sensitivity
    2.88 pmol/L
  • Assay Range
    28.9 - 1,850 pmol/L (Cell Culture Supernates, Serum, EDTA Plasma, Heparin Plasma, Urine)
  • Specificity
    Natural and synthetic human Insulin C-Peptide.
  • Cross-reactivity
    < 0.5% cross-reactivity observed with available related molecules.< 50% cross-species reactivity observed with species tested.
  • Interference
    No significant interference observed with available related molecules.
Control Available
Product Summary
The Quantikine Human Insulin C-Peptide Immunoassay is a 2.5 hour solid-phase ELISA designed to measure human Insulin C-Peptide in cell culture supernates, serum, plasma, and urine. It contains synthetic human Insulin C-Peptide and has been shown to accurately quantitate the peptide. Results obtained using natural human Insulin C-Peptide showed linear curves that were parallel to the standard curves obtained using the Quantikine kit standards. These results indicate that this kit can be used to determine relative mass values for naturally occurring human Insulin C-Peptide.

Intra-Assay Precision (Precision within an assay) Intra-assay Precision (Precision within an assay)
Three samples of known concentration were tested twenty times on one plate to assess intra-assay precision.
Inter-Assay Precision (Precision between assays) Inter-assay Precision (Precision between assays)
Three samples of known concentration were tested in twenty separate assays to assess inter-assay precision. Assays were performed by at least three technicians using two lots of components.
Cell Culture Supernates, Serum, EDTA Plasma, Heparin Plasma, Urine
Intra-Assay Precision Inter-Assay Precision
Standard Deviation5.7714.313.212.43365.3


The recovery of human Insulin C-Peptide spiked to levels throughout the range of the assay in various matrices was evaluated.

Sample Type Average % Recovery Range %
Cell Culture Media (n=4) 99 84-106
EDTA Plasma (n=4) 101 95-108
Heparin Plasma (n=4) 102 90-115
Serum (n=4) 103 96-109
Urine (n=4) 97 81-106
To assess the linearity of the assay, samples containing and/or spiked with high concentrations of human Insulin C-Peptide were diluted with Calibrator Diluent to produce samples with values within the dynamic range of the assay.
Human C-Peptide Quantikine ELISA Kit
Preparation and Storage
  • Storage
    Store the unopened product at 2 - 8 °C. Do not use past expiration date.
Background: C-Peptide
Insulin and the IGFs are members of the insulin family of molecules. IGF-I and II are structurally homologous to proinsulin, and can be thought of as taking the shape of an exaggerated, inverted letter G. Intrachain disulfide bonds link sections of the G. The single chain insulin propeptide consists of a 30 amino acid B chain (aa 2554), a C-peptide (aa 5589), and a 21 aa A chain (aa 90110). Removal of the C-peptide by proteolysis enables the formation of mature Insulin, a disulfidelinked heterodimer of the A and B chains. Circulating C-peptide levels are elevated in hyperinsulinism, obesity, and type II diabetes.
    • Long Name
      Proinsulin C-Peptide
    • Entrez Gene IDs
      3630 (Human); 16333 (Mouse); 397415 (Porcine); 280829 (Bovine); 483665 (Canine);
    • Alternate Names
      C-P; IDDM2; ILPR; Insulin C-Peptide; insulin; IRDN; MODY10; Proinsulin C-Peptide; proinsulin;
    Related Research Areas
    Assay Procedure
    Refer to the product for complete assay procedure.

    Bring all reagents and samples to room temperature before use. It is recommended that all samples, standards, and controls be assayed in duplicate.
    1.   Prepare all reagents, standard dilutions, and samples as directed in the product insert.
    2.   Remove excess microplate strips from the plate frame, return them to the foil pouch containing the desiccant pack, and reseal.

    3. 100 µL Assay Diluent
    4.   Add 100 µL of Assay Diluent to each well.

    5. 100 µL Standard, Control, or Sample
    6.   Add 100 µL of Standard, control, or sample to each well. Cover with a plate sealer, and incubate at room temperature for 1 hour.
    7.   Aspirate each well and wash, repeating the process 3 times for a total of 4 washes.

    8. 200 µL Conjugate
    9.   Add 200 µL of Conjugate to each well. Cover with a new plate sealer, and incubate at room temperature for 1 hour.
    10.   Aspirate and wash 4 times.

    11. 200 µL Substrate Solution
    12.   Add 200 µL Substrate Solution to each well. Incubate at room temperature for 30 minutes. PROTECT FROM LIGHT.

    13. 50 µL Stop Solution
    14.   Add 50 µL of Stop Solution to each well. Read at 450 nm within 30 minutes. Set wavelength correction to 540 nm or 570 nm.
    ELISA Controls
    Description Application Cat# Citations Images  

    Quantikine Immunoassay Control Set 801 Human Insulin C-Pep

    Ctrl QC108
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    Supplemental ELISA Products
    Description Application Cat# Citations Images  

    Quantikine Wash Buffer 1

    ELISA WA126 5
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