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Interference of hemolysis, hyperlipidemia, and icterus on plasma infrared spectral profile

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Abstract

Recently, pre-analytical, analytical, and post-analytical issues have been addressed to implement biofluid FTIR spectroscopy as a novel diagnostic tool in the clinical setting. Although hemolysis, icterus, and hyperlipidemia are known to interfere with colorimetric and turbidimetric biochemical methods, there are no data on their impact on serum/plasma FTIR spectra. This study aimed at investigating the impact of hemoglobin, bilirubin, and triglycerides concentrations on plasma spectral analysis. Plasma samples with high concentrations of hemoglobin, conjugated bilirubin, or triglycerides were studied. To mimic the various concentrations observed in clinical setting, samples were diluted using normal plasma and analyzed using high-throughput FTIR spectroscopy. Hemolytic, icteric, and hyperlipidemic plasma spectra were compared with control plasma spectra. Unsupervised analysis of all spectra was performed using principal component analysis. The comparison between control and hemolytic plasmas did not show spectral differences in the range of hemoglobin concentrations observed in spurious or pathological hemolysis. By contrast, spectra from lipidemic plasmas had different spectral profiles compared with control plasma, exhibiting increased absorbance in lipid bands. Differences in the same spectral regions were observed in spectra from icteric plasma, which may be explained by the hyperlipidemia associated with cholestasis. PCA did not discriminate between control and hemolytic plasmas up to 1 g/L hemoglobin but confirmed the interference of bilirubin and triglycerides concentrations on spectral classification. Our results show that hemolysis does not have an impact on the plasma spectral profile except for high concentrations of hemoglobin rarely observed in clinical practice, whereas icterus and hyperlipidemia constitute significant confounding factors.

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Acknowledgments

Support from SATT Nord (Société d’Accélération du Transfert de Technologie) is gratefully acknowledged. The authors thank the PICT-IBiSA Platform for vibrational spectroscopy instrument facilities.

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Correspondence to Ganesh D. Sockalingum.

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Untereiner, V., Garnotel, R., Thiéfin, G. et al. Interference of hemolysis, hyperlipidemia, and icterus on plasma infrared spectral profile. Anal Bioanal Chem 412, 805–810 (2020). https://doi.org/10.1007/s00216-019-02312-0

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