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HPLC method with post-column derivatization for the analysis of endogenous histidine in human saliva validated using the total-error concept

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Abstract

Histidine (His) is an essential amino acid that plays an important biological role and associated with various pathological conditions. A simple and reliable method for the determination of endogenous histidine in human saliva was optimized and validated. The analyte was separated from the saliva matrix by cation exchange chromatography and detected fluorimetrically (λex/λem = 360/440 nm) after online, specific post-column derivatization (PCD) reaction with o-phthalaldehyde. The chemical and instrumental variables of the post-column reaction were optimized using Box–Behnken experimental design to achieve maximum sensitivity. Method validation was carried out employing the total-error concept. Histidine could be analyzed reliably in the range of 0.5–5.0 μΜ, with an LOD (S/N = 3) of 50 nM. Monte Carlo simulations and capability analysis were used to investigate the ruggedness of the PCD reaction. The sampling strategy, sample preparation and stability were also investigated. Seventeen saliva samples were successfully analyzed with histidine levels being in the range of 2.7–19.5 μΜ.

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Abbreviations

HPLC:

High-pressure liquid chromatography

PCD:

Post-column derivatization

His:

Histidine

OPA:

o-Phthalaldehyde

BISM:

Binary inlet static mixer

LOD/LOQ:

Limits of detection/quantitation

β-ΕΤΙ:

β-Expectation tolerance intervals

ANOVA:

Analysis of variance

BBD:

Box–Behnken design

LoF:

Lack of fit

LLOQ:

Lower limit of quantitation

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Correspondence to Paraskevas D. Tzanavaras.

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The authors have no competing interests to declare that are relevant to the content of this article.

Research involving human participants, their data or biological material

All human participants in this study were members of the Laboratory of Analytical Chemistry of the Department of Chemistry and donated saliva samples on a voluntary basis. They were informed in detail about the non-medical nature of the work and provided written consent.

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All human volunteers participating in this research were informed and provided written consent to participate in the study, including publication of the results.

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Handling editor: D. Tsikas.

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Gkantiri, AM., Tsiasioti, A., Zacharis, C.K. et al. HPLC method with post-column derivatization for the analysis of endogenous histidine in human saliva validated using the total-error concept. Amino Acids 54, 399–409 (2022). https://doi.org/10.1007/s00726-022-03135-7

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  • DOI: https://doi.org/10.1007/s00726-022-03135-7

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