Elom AK, Imane EM, Kaoutar B, Khalid EK, Asmaa EH, Mehdi A, Noureddine EH, Hassan A. Comparison of a fluorometric assay kit with high-performance liquid chromatography for the assessment of serum retinol concentration.
Afr Health Sci 2015;
15:641-6. [PMID:
26124815 DOI:
10.4314/ahs.v15i2.43]
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Abstract
BACKGROUND
Although high-performance liquid chromatography (HPLC) is the commonly used method for the analysis of retinol in biological samples, simple and rapid test kits are available.
OBJECTIVES
This study compared a rapid test kit (ICHECK Fluoro®) to HPLC for the assessment of serum retinol concentrations.
METHODS
For the analysis by HPLC, sample preparation included standard deproteinization and extraction phases. The analysis by ICHECK was performed by injecting serum into IEX reagent vials (n=89) and mixing manually for separation. After precipitation of the proteins, the vial was introduced into the chamber of the ICHECK Fluoro and analysed at 0 min (ICHECK0min) and 15 min later (ICHECK15min). Bland and Altman approach was applied to test the agreement between HPLC and ICHECK.
RESULTS
Mean HPLC, ICHECK0min and ICHECK15min values were 421.2±106.0 µg/L, 423.1±118.3 µg/L and 413.2±107.6 µg/L, respectively. Retinol concentrations significantly decreased in the IEX solution over time (p<0.001). No significant proportional bias was observed between HPLC and ICHECK0min (r-0.038, p=0.73) and ICHECK15min (r=-0.024, p=0.82). Fixed biases (HPLC minus ICHECK) for ICHECK0min and ICHECK15min were respectively -1.9±23.1 µg/l (p=0.45) and 8.0±22.7 µg/l (p=0.002).
CONCLUSION
ICHECK Fluoro may offer a reliable mean for assessing serum retinol for measurements performed with no significant time delay.
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