Cited by 90Biosensors and Analytical DetectionElectrochemical sensors and biosensorsAdvanced biosensing and bioanalysis techniques

Comparison of Colorimetric Analyses to Determine Cortisol in Human Sweat

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Tu, Ethan, Pearlmutter, Paul, Tiangco, Michelle, Derose, Gia, Begdache, Lina, Koh, Ahyeon·2020·ACS Omega

Abstract

Colorimetric analysis, which relies on a chemical reaction to facilitate a change in visible color, is a great strategy for detecting cortisol, which is necessary to diagnose and manage the wide variety of diseases related to the hormone, because it is simple in design, inexpensive, and reliable as a standard cortisol analysis technique. In this study, four different colorimetric cortisol analyses that use various chromogens, which include sulfuric acid, Porter–Silber reagent, Prussian blue, and blue tetrazolium, are studied. Modifications to the classic Porter–Silber method are made by increasing the carbon content of the alcohol and adding gold nanoparticles, which result in a twofold increase in reaction rate and a slight decrease in the limit of detection (LoD). After a comparison of the reaction rate, LoD, dynamic range, characteristic peaks, and color stability of all methods, blue tetrazolium demonstrates a low LoD (97 ng/mL), broad dynamic range (0.05–2 μg/mL), and quick reaction rate (color development as fast as 10 min), which are well within the requirements for human biofluids. Cortisol in artificial saliva and sweat and in human sweat was determined while confirming that no excipients or other biomarkers interfered with the reactions. Twenty-one human sweat samples were tested using blue tetrazolium and revealed a significant difference between male and female apocrine cortisol concentrations and showed a highly significant difference between apocrine and eccrine cortisol concentrations. Colorimetric methods of cortisol can compete with existing electrochemical sensors because of their similar accuracy and detection range in certain wearable biosensor applications. The simplicity of colorimetric methods advances potential applications in skin-interfaced bio-electronics and point-of-care devices.

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Authors
Tu, E., Pearlmutter, P., Tiangco, M., Derose, G., Begdache, L., & Koh, A.
Affiliations
Binghamton University (US)
Corresponding author
Koh, Ahyeon
Venue
ACS Omega
Published
2020-03-31
Volume
5
Issue
14
Pages
8211-8218
ISSN
2470-1343 (ISSN-L)
OpenAlex
W3015076834
Cited by
90
References
50
Citations by year
2026: 16 · 2025: 16 · 2024: 18 · 2023: 13 · 2022: 13 · 2021: 11 · 2020: 3
FWCI
3.14
Type
journal article
Language
en
Open access
Locations
  • ACS Omega (publishedVersion, other-oa)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • The Open Repository - Binghamton (Binghamton University) (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • Air Force Research Laboratory (FA8650-18-2- 5402)
  • Binghamton University (NA)
Topics
  • Physical Sciences › Engineering › Biomedical Engineering › Biosensors and Analytical Detection
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Electrochemical sensors and biosensors
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Advanced biosensing and bioanalysis techniques
Keywords
cortisol, human sweat, colorimetric assay, Prussian blue, gold nanoparticles, apocrine sweat, eccrine sweat, detection limit, reaction rate, wearable biosensors, point-of-care devices

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