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Free Homocysteine ELISA Kit (A326576)

Standard Curve - Free Homocysteine ELISA Kit (A326576) - Antibodies.com
$640
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$40
Dispatched from St. Louis, MO.
Lead Time: 7-11 business days.
Name
Free Homocysteine ELISA Kit
Description
Free Homocysteine ELISA Kit is a competitive Enzyme-Linked Immunosorbent Assay (cELISA) designed for the in vitro quantitative determination of universal Free Homocysteine in serum, plasma, cell culture supernatant, cell or tissue lysate, and other liquid samples.
Assay Type
Competitive (quantitative)
Principle of Assay
Free Homocysteine ELISA Kit (A326576) employs the competitive enzyme immunoassay technique for the quantitative measurement of Free Homocysteine in serum, plasma, cell culture supernatant, cell or tissue lysate, and other liquid samples. The 96-well microtiter plate has been pre-coated with Free Homocysteine antigen. During the incubation, Free Homocysteine present in the samples or standards competes with the fixed amount of immobilized Free Homocysteine for binding sites on the Biotinylated Anti-Free Homocysteine Antibody. The more Free Homocysteine present in a sample or standard, the less Biotinylated Anti-Free Homocysteine Antibody that binds to the plate. Following incubation, unbound Biotinylated Anti-Free Homocysteine Antibody is removed by washing, and an HRP-Streptavidin conjugate is added to the wells and the microtiter plate is incubated. Following incubation and washing, TMB substrate solution is then used to visualize the HRP enzymatic reaction by catalysis to produce a blue-coloured product that changes to yellow after addition of acidic stop solution. The density of yellow is inversely proportional to the amount of Free Homocysteine present in each sample or standard. The concentration of Free Homocysteine can then be calculated by reading the O.D. absorbance at 450nm in a microplate reader and referring to the standard curve.
Platform
Pre-coated Microplate (12 x 8 well strips)
Detection Type
Colorimetric
Instrument
Colorimetric Microplate Reader
Sample Type
Serum, plasma, cell culture supernatant, cell or tissue lysate, and other liquid samples.
Sensitivity
0.15 µmol/l
Product Range
0.25-16 µmol/l
Assay Time
2 hours
Reactivity
Universal
Recovery
Sample Type n Range Average
Serum 10 85% - 101% 92%
EDTA Plasma 10 87% - 104% 98%
Heparin Plasma 10 85% - 102% 91%
Linearity
Sample Type n 1:2 1:4 1:8
Serum 10 85-93% 86-97% 98-100%
EDTA Plasma 10 86-103% 86-100% 89-99%
Heparin Plasma 10 86-103% 88-101% 85-91%
Precision
Intra-assay CV: < 8%, Inter-assay CV: < 10%
Storage
Store at +4°C. Do not use past expiration date!
Product Note
Information online is representative. Always refer to the Product Manual inside the kit.
Disclaimer
This product is for research use only. It is not intended for diagnostic or therapeutic use.
Kit Components
Item Quantity Storage
Pre-Coated 96 Well Microplate 12 x 8 Well Strips +4°C
Lyopholized Standard 2 Vials +4°C
Sample Dilution Buffer 20ml +4°C
Biotinylated Detection Antibody 60µl +4°C
Antibody Dilution Buffer 10ml +4°C
HRP-Streptavidin Conjugate 120µl +4°C
SABC Dilution Buffer 10ml +4°C
TMB Substrate 10ml +4°C
Stop Solution 10ml +4°C
Wash Buffer (25X) 30ml +4°C
Plate Sealers 5 Adhesive Strips -
Foil Pouch 1 Zip-Sealed Pouch -
Required Materials
The following materials are not included in the kit, but are required to run this assay:
  • Microplate reader capable of measuring absorbance at 450nm ± 10nm.
  • Squirt bottle, multichannel pipette reservoir, or automated microplate washer.
  • Graph paper or computer software capable of generating logarithmic functions.
  • Test tubes and Eppendorf tubes to prepare standards and samples.
  • Multi- and single-channel pipettes and sterile pipette tips.
  • Deionized or distilled water.
  • Absorbent paper towels.
  • 37°C incubator.
Important Notes
  • Sample concentrations should be estimated before being used in the assay and a proper dilution factor should be selected to make the diluted target protein concentration fall in the optimal detection range of this kit.
  • Sample matrix components will interfere with the test results. All samples must be diluted at least 1:2 with Sample Dilution Buffer.
  • Hemolysis can greatly impact the validity of test results. Take care to minimize hemolysis.
  • This ELISA kit is intended for the analysis of biological samples and has not been validated for purified/recombinant proteins, industrial, or commercial materials. Performance with such samples cannot be guaranteed, as differences in expression, sequence, tags, folding, post-translational modifications, purity, activity, or buffer composition may affect assay results. For further guidance, please contact our technical support team.
Bring all reagents and samples to room temperature before use.
We recommend that all standards and samples be assayed in duplicate.
Step 1
Prepare all reagents, samples, and working standards as directed in the previous sections.
Step 2
Determine the number of microplate strips required for the assay and insert them into the plate frame. Unused strips should be stored in the foil pouch at +4°C.
Step 3
Wash the plate two times with Wash Buffer. Soak wells with 350μl of Wash Buffer for 1-2 minutes each time. Note: Complete removal of liquid at each step is essential to good performance. After the last wash, remove any remaining Wash Buffer by aspirating or decanting. Blot the plate onto paper towels or other absorbent material. Do not let the wells dry completely at any time!
Step 4
Add 50μl of standard solutions to the standard wells. Note: A plate layout is provided to record standards and samples assayed.
Step 5
Add 50μl of samples to the sample wells. Note: All samples must be properly diluted in order to produce sample values within the dynamic range of the assay.
Step 6
Immediately add 50μl of Biotinylated Detection Antibody working solution to each well. Gently tap the plate to ensure thorough mixing for 1 minute.
Step 7
Cover with an adhesive plate sealer provided and incubate at 37°C for 45 minutes.
Step 8
Remove the plate sealer, aspirate the liquid from the plate, and wash the plate three times with Wash Buffer. Soak wells with 350μl of Wash Buffer for 1-2 minutes each time.
Step 9
Add 100μl of HRP-Streptavidin Conjugate (SABC) working solution to each well.
Step 10
Cover with a new adhesive plate sealer and incubate at 37°C for 30 minutes.
Step 11
Remove the plate sealer, aspirate the liquid from the plate, and wash the plate five times with Wash Buffer. Soak wells with 350μl of Wash Buffer for 1-2 minutes each time.
Step 12
Add 90μl of TMB Substrate to each well. Cover with a new adhesive plate sealer and incubate at 37°C in the dark for 10-20 minutes. Note: This incubation time is for reference only, the optimal reaction time should be determined by the end-user and can be shortened or extended according to the actual color change. The reaction may be terminated when a gradient is apparent in the standard wells. Do not exceed 30 minutes!
Step 13
Add 50μl of Stop Solution to each well. The color in the wells should change from blue to yellow immediately. Note: If the color in the wells is green or the color change does not appear uniform, gently tap the plate to ensure thorough mixing.
Step 14
Determine the optical density (O.D. value) of each well immediately using a microplate reader set to 450 nm.

  • Scientific Validation DataValidation Data (1)

Standard Curve - Free Homocysteine ELISA Kit (A326576) - Antibodies.comEnlarge Image

Standard Curve - Free Homocysteine ELISA Kit (A326576)

Representative standard curve for Free Homocysteine ELISA Kit (A326576).
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