Human CD74 ELISA Kit (A77851)

Name: Human CD74 ELISA Kit
Brand: Antibodies.com
SKU: A77851
Price: 460.0 GBP
Availability: InStock

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$665

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Freight/Packing Charges: $40

Dispatched from St. Louis, MO.

Lead Time: 7-11 business days.

Name

Human CD74 ELISA Kit

Description

Human CD74 ELISA Kit is a 4 hour sandwich Enzyme-Linked Immunosorbent Assay (sELISA) designed for the in vitro quantitative determination of human CD74 in serum, plasma, tissue homogenates, and other biological fluids.

Assay Type

Sandwich (quantitative)

Principle of Assay

Human CD74 ELISA Kit (A77851) is a 4 hour sandwich Enzyme-Linked Immunosorbent Assay (sELISA) designed for the in vitro quantitative determination of human CD74 in serum, plasma, tissue homogenates, and other biological fluids. A 96-well microtiter plate has been pre-coated with an antibody specific for CD74. Standards and samples are added to the wells, where CD74 binds to the immobilized capture antibody. Following incubation, unbound components are removed by washing and a biotinylated detection antibody specific for CD74 is added to the wells. The detection antibody binds the captured CD74 to form an antibody-antigen-antibody sandwich complex. After further incubation and washing, HRP-Streptavidin conjugate is added to the wells. TMB substrate solution is then added to visualize the HRP enzymatic reaction. This produces a blue-coloured product that changes to yellow following addition of acidic stop solution. The intensity of the yellow colour is directly proportional to the amount of CD74 captured in each well. The concentration of CD74 is calculated by reading the absorbance at 450 nm and comparing the values with the standard curve.

Platform

Pre-coated Microplate (12 x 8 well strips)

Detection Type

Colorimetric Detection (OD450)

Instrument

Colorimetric Microplate Reader

Sample Type

Serum, plasma, tissue homogenates, and other biological fluids.

Sensitivity

0.375 ng/mL

Product Range

0.625-40 ng/mL

Assay Time

4 hours

Reactivity

Human

Cross Reactivity

Specific for CD74 with no reported cross-reactivity with other analogs or variants.

Recovery

Sample Type	n	Range	Average
Serum	10	88% - 104%	97%
EDTA Plasma	10	90% - 105%	100%
Heparin Plasma	10	86% - 104%	95%

Linearity

Sample Type	n	1:2	1:4	1:8
Serum	10	88-102%	92-105%	85-102%
EDTA Plasma	10	85-95%	82-95%	82-98%
Heparin Plasma	10	80-100%	83-97%	80-100%

Storage

Shipped at +4°C. Store kit components at +4°C or -20°C as instructed in the Protocol Manual. Do not use past expiration date! Avoid freeze/thaw cycles.

Synonyms

DHLAG, HLA class II histocompatibility antigen gamma chain, HLA-DR antigens-associated invariant chain, Ia antigen-associated invariant chain, Ii

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	120µl	+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

Add 100μl of standard solutions to the standard wells. Note: A plate layout is provided to record standards and samples assayed.

Step 4

Add 100μl 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. All samples must be diluted at least 1:2 with Sample Dilution Buffer.

Step 5

Cover with an adhesive plate sealer provided and incubate at 37°C for 90 minutes.

Step 6

Remove the plate sealer, aspirate the liquid from the plate, and 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 7

Add 100μl of Biotinylated Detection Antibody working solution to each well.

Step 8

Cover with a new adhesive plate sealer and incubate at 37°C for 60 minutes.

Step 9

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 10

Add 100μl of HRP-Streptavidin Conjugate (SABC) working solution to each well.

Step 11

Cover with a new adhesive plate sealer and incubate at 37°C for 30 minutes.

Step 12

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 13

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 14

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 15

Determine the optical density (O.D. value) of each well immediately using a microplate reader set to 450 nm.

Scientific Validation DataValidation Data (2)

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Standard Curve - Human CD74 ELISA Kit (A77851)

Representative standard curve for Human CD74 ELISA Kit (A77851).

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Human CD74 ELISA Kit (A77851)

Linearity assessment of the Human CD74 ELISA Kit (A77851) across serial sample dilutions. Linearity was evaluated using Serum, EDTA Plasma, and Heparin Plasma samples serially diluted from 1:2 to 1:8. Recovery (%) was calculated relative to the expected Human CD74 concentration at each dilution. Data are presented as mean recovery values from 10 replicates (n = 10).

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