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ELISA Kit for Tetrahydrofolic Acid (THFA)

H4FA; THF; Tetrahydrofolate

Specificity

This assay has high sensitivity and excellent specificity for detection of Tetrahydrofolic Acid (THFA).
No significant cross-reactivity or interference between Tetrahydrofolic Acid (THFA) and analogues was observed.

Recovery

Matrices listed below were spiked with certain level of Tetrahydrofolic Acid (THFA) and the recovery rates were calculated by comparing the measured value to the expected amount of Tetrahydrofolic Acid (THFA) in samples.

Matrix Recovery range (%) Average(%)
serum(n=5) 89-97 92
EDTA plasma(n=5) 91-99 96
heparin plasma(n=5) 91-99 96

Precision

Intra-assay Precision (Precision within an assay): 3 samples with low, middle and high level Tetrahydrofolic Acid (THFA) were tested 20 times on one plate, respectively.
Inter-assay Precision (Precision between assays): 3 samples with low, middle and high level Tetrahydrofolic Acid (THFA) were tested on 3 different plates, 8 replicates in each plate.
CV(%) = SD/meanX100
Intra-Assay: CV<10%
Inter-Assay: CV<12%

Linearity

The linearity of the kit was assayed by testing samples spiked with appropriate concentration of Tetrahydrofolic Acid (THFA) and their serial dilutions. The results were demonstrated by the percentage of calculated concentration to the expected.

Sample 1:2 1:4 1:8 1:16
serum(n=5) 89-96% 91-98% 82-102% 78-102%
EDTA plasma(n=5) 92-102% 88-97% 87-101% 97-104%
heparin plasma(n=5) 88-97% 80-97% 89-101% 88-101%

Stability

The stability of kit is determined by the loss rate of activity. The loss rate of this kit is less than 5% within the expiration date under appropriate storage condition.
To minimize extra influence on the performance, operation procedures and lab conditions, especially room temperature, air humidity, incubator temperature should be strictly controlled. It is also strongly suggested that the whole assay is performed by the same operator from the beginning to the end.

Reagents and materials provided

Reagents Quantity Reagents Quantity
Pre-coated, ready to use 96-well strip plate 1 Plate sealer for 96 wells 4
Standard 2 Standard Diluent 1×20mL
Detection Reagent A 1 Assay Diluent A 1×12mL
Detection Reagent B 1×120µL Assay Diluent B 1×12mL
Reagent Diluent 1×300µL Stop Solution 1×6mL
TMB Substrate 1×9mL Instruction manual 1
Wash Buffer (30 × concentrate) 1×20mL

Assay procedure summary

1. Prepare all reagents, samples and standards;
2. Add 50µL standard or sample to each well.
    And then add 50µL prepared Detection Reagent A immediately.
    Shake and mix. Incubate 1 hour at 37°C;
3. Aspirate and wash 3 times;
4. Add 100µL prepared Detection Reagent B. Incubate 30 minutes at 37°C;
5. Aspirate and wash 5 times;
6. Add 90µL Substrate Solution. Incubate 10-20 minutes at 37°C;
7. Add 50µL Stop Solution. Read at 450 nm immediately.

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Magazine Citations
Scientifica Assessment of Folic Acid Supplementation in Pregnant Women by Estimation of Serum Levels of Tetrahydrofolic Acid, Dihydrofolate Reductase, and Homocysteine Pubmed:27064332
Cross-sectional Association Between Vitamin B12 Status and Probable Postpartum Depression in Indian Women
Int J Biol Macromol Enhanced cellular uptake, transport and oral bioavailability of optimized folic acid-loaded chitosan nanoparticles Pubmed:35292282
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