title: Fast determination of thyroid stimulating hormone in human blood serum without chemical preprocessing by using infrared spectroscopy and least squares support vector machines.
abstract: The least squares support vector machines (LS-SVM) was used to model infrared spectral data for TSH hormone secreted by thyroid, which regulates the basal metabolic rate. This model was used for direct estimation of the content of TSH in blood serum samples, and the results were comparable with those obtained with the conventional analytical method based on chemoluminescence methodology. Excellent agreement was observed between the conventional method and the newly developed calibration model based in analysis of spectral data with LS-SVM. The latter has clear advantages, because it is fast and requires no reagent once the measurements were done directly in the serum by using a simple mid-infrared spectrometer in the ATR mode. An important advantage observed in this calibration method based on LS-SVM is the remarkable capacity to avoid overfitting in the model-building step, that is, the developed method is highly robust.
authors.affiliation: Centre of environmental Sciences, University of Mogi das Cruzes, SP, Brazil. camello@umc.br
authors.forename: Cesar
authors.initials: C
authors.lastname: Mello
authors.forename: Antônio
authors.initials: A
authors.lastname: Marangoni
authors.forename: Ronei
authors.initials: R
authors.lastname: Poppi
authors.forename: Isao
authors.initials: I
authors.lastname: Noda
mesh_terms: D001185:Artificial Intelligence; D006801:Humans; D016018:Least-Squares Analysis; D015203:Reproducibility of Results; D044967:Serum / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared / Q000191:economics / Q000379:methods*; D013972:Thyrotropin / Q000097:blood*; D013997:Time Factors
chemical_list: D013972:Thyrotropin