HOW RELIABLE ARE CALIBRATORS FOR URINARY MELATONIN SULFATE?
DOI:
https://doi.org/10.11603/mie.1996-1960.2016.3.6759Keywords:
urinary melatonin-sulfate, dose-response relationship, Hill’s equation, computer fitting, calibrators, photometryAbstract
Melatonin is a versatile physiological agent that relating to the control of numerous physiologic processes owing to the multiplicity of sites of formation and the presence of melatonin receptors in various places of a human body. The melatonin metabolite 6-sulphatoxymelatonin (alias aMT6s or 6-SMT) infiltrates in urine. Therefore, there is a sense to find the sensitive and selective express-methods for the precise detection of melatonin metabolites in body fluids.
The calibrators are proper tools for the signal processing. In the present research work that is the set of few calibers with well-defined concentrations of analyte. Comparison of the measured response of actual sample with reactions of calibers permits to interpret the real signal. Such a response can be either the transmittance or the optical density of sample that are measured by a photometer. The calibration of dose-response relation has been described by logistic Hill's curve with four parameters. The photometric transmittances of analyzed solutions were considered as the response. This paper describes the evaluation and comparison of sets of Hill's parameters for aMT6s-calibrators of independent producers. Reliable calibrators could help to simplify the analysis of urinary melatonin-sulfate dose. Such express-analysis could be more accessible in addition. Hence, the problem of creation of reliable calibrators is still unsolved and challenging.
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