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FA(Folic Acid) ELISA Kit
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ELK11781
Size： Price：
48 T $412.00
96 T $588.00
96 T*5 $2499.00
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Overview

Product name: FA(Folic Acid) ELISA Kit
Reactivity: General
Alternative Names: VB9; Vitamin B9; Folacin; Folate; V; Itamin M; Vitamin M; Vitamin Bc; Pteroyl-L-Glutamic Acid; Pteroyl-L-Glutamate
Assay Type: Competitive Inhibition
Sensitivity: 1.4 ng/mL
Standard: 500 ng/mL
Detection Range: 7.81-500 ng/mL
Sample Type: serum, plasma, cell lysates, cell culture supernates and other biological fluids
Assay Length: 2h
Research Area: Hematology;Reproductive science;Nutrition metabolism;
Test principle: This assay employs the competitive inhibition enzyme immunoassay technique. The microtiter plate provided in this kit has been pre-coated with FA. Standards or samples are added to the appropriate microtiter plate wells then with a biotin-conjugated antibody specific to FA. Next, Avidin conjugated to Horseradish Peroxidase (HRP) is added to each microplate well and incubated. After TMB substrate solution is added. The enzyme-substrate reaction is terminated by the addition of sulphuric acid solution and the color change is measured spectrophotometrically at a wavelength of 450nm ± 10nm. The concentration of FA in the samples is then determined by comparing the OD of the samples to the standard curve.

Standard curve

Concentration (ng/mL) OD Corrected OD
500.00 0.219
250.00 0.433
125.00 0.786
62.50 0.967
31.25 1.275
15.63 1.565
7.82 1.871
0.00 2.375

Precision

Intra-assay Precision (Precision within an assay)：CV%<8%

Three samples of known concentration were tested twenty times on one plate to assess intra-assay precision.

Inter-assay Precision (Precision between assays)：CV%<10%

Three samples of known concentration were tested in forty separate assays to assess inter-assay precision.

Recovery

Matrices listed below were spiked with certain level of recombinant FA and the recovery rates were calculated by comparing the measured value to the expected amount of FA in samples.
Matrix Recovery range Average
serum(n=5) 87-101% 94%
EDTA plasma(n=5) 81-90% 86%
Heparin plasma(n=5) 82-90% 86%

Linearity

The linearity of the kit was assayed by testing samples spiked with appropriate concentration of FA and their serial dilutions. The results were demonstrated by the percentage of calculated concentration to the expected.
Matrix 1:2 1:4 1:8 1:16
serum(n=5) 89-101% 78-89% 93-104% 79-93%
EDTA plasma(n=5) 83-94% 93-104% 81-92% 81-92%
Heparin plasma(n=5) 95-103% 78-85% 94-100% 80-90%