Cortisone Analysis by FTIR Spectroscopy: In Vitro Study
Cortisol, known as the “stress hormone”, is vital for stress response, metabolism regulation, and immune function, and salivary cortisone reflects serum cortisol levels. The measurement of salivary cortisone levels has been proposed as an effective alternative method for estimating serum cortisol levels. Objective: This study aimed to evaluate the use of Fourier Transform Infrared Spectroscopy (FTIR) for salivary cortisone identification and quantification and to assess the impact of adding the surfactant TWEEN 80 to the analysis. Methods: Initially, cortisone was diluted in chloroform and methanol (5,000,000 µg/dL). FTIR spectra were obtained, and absorbance characteristics and peaks were identified. The spectrum of this initial dilution was processed using the Savitzky-Golay filter to evaluate peak heights at 1655 cm−1 and 1700 cm−1, and the effect of signal processing on these peaks was assessed. Additionally, two series of dilutions were performed by adding the surfactant TWEEN 80 at two different concentrations, and the effect of the surfactant on the cortisone spectra was evaluated to reduce noise and enhance the signal. Results: The spectra obtained from the cortisone solution were similar to those found in the literature for solid samples. The peak corresponding to the wavenumber range of 1600–1680 cm−1, related to the stretching bands of C=C, was found to be reliable for use in cortisone quantification studies. The standard deviation between the spectra of the same sample was less than 0.01. It was not possible to detect cortisone when TWEEN 80 was added; however, with signal processing, TWEEN 80 could be detected in quantities as low as 0.0033% of the solution. Conclusions: FTIR demonstrates potential as a non-invasive method for cortisone analysis. While Tween 80 aids in the dilution of cortisone in water, it obscures its spectrum.
Citação
@online{luciana_paula_benício2025,
author = {Luciana Paula Benício , Arcas and Silva, Sara Maria Santos
Dias, Da and Felipe Carlos Dias , Arcas and Flávio Henrique , Alves
and Carvalho, Luís Felipe Das Chagas E Silva, De and Marina ,
Amaral},
title = {Cortisone Analysis by FTIR Spectroscopy: In Vitro Study},
volume = {13},
number = {4},
date = {2025-04-07},
doi = {10.3390/pr13041112},
langid = {pt-BR},
abstract = {Cortisol, known as the “stress hormone”, is vital for
stress response, metabolism regulation, and immune function, and
salivary cortisone reflects serum cortisol levels. The measurement
of salivary cortisone levels has been proposed as an effective
alternative method for estimating serum cortisol levels. Objective:
This study aimed to evaluate the use of Fourier Transform Infrared
Spectroscopy (FTIR) for salivary cortisone identification and
quantification and to assess the impact of adding the surfactant
TWEEN 80 to the analysis. Methods: Initially, cortisone was diluted
in chloroform and methanol (5,000,000 µg/dL). FTIR spectra were
obtained, and absorbance characteristics and peaks were identified.
The spectrum of this initial dilution was processed using the
Savitzky-Golay filter to evaluate peak heights at 1655 cm−1 and 1700
cm−1, and the effect of signal processing on these peaks was
assessed. Additionally, two series of dilutions were performed by
adding the surfactant TWEEN 80 at two different concentrations, and
the effect of the surfactant on the cortisone spectra was evaluated
to reduce noise and enhance the signal. Results: The spectra
obtained from the cortisone solution were similar to those found in
the literature for solid samples. The peak corresponding to the
wavenumber range of 1600–1680 cm−1, related to the stretching bands
of C=C, was found to be reliable for use in cortisone quantification
studies. The standard deviation between the spectra of the same
sample was less than 0.01. It was not possible to detect cortisone
when TWEEN 80 was added; however, with signal processing, TWEEN 80
could be detected in quantities as low as 0.0033\% of the solution.
Conclusions: FTIR demonstrates potential as a non-invasive method
for cortisone analysis. While Tween 80 aids in the dilution of
cortisone in water, it obscures its spectrum.}
}