Easy-to-Prepare Mini-Chemosensor Array for Simultaneous Detection of Cysteine and Glutathione Derivatives

Area of Science:

• Analytical Chemistry
• Biomarker Detection
• Sensor Technology

Background:

• Sulfur-containing amino acids (SCAAs) are crucial biomarkers for various physiological and pathological processes.
• Accurate and simultaneous detection of multiple SCAAs remains a challenge in clinical diagnostics.
• Existing methods often lack the sensitivity, specificity, or ease of use required for rapid analysis.

Purpose of the Study:

• To develop an easy-to-prepare mini-chemosensor array for simultaneous classification and quantification of key SCAAs.
• To investigate the detection mechanism based on coordination chemistry between coumarin dyes, Zn2+ ions, and SCAAs.
• To demonstrate the practical application of the developed sensor array for biomarker detection in complex biological matrices.

Main Methods:

• Construction of a mini-chemosensor array using two off-the-shelf coumarin dyes.
• Utilizing a coordination-based sensor array (CBSA) mechanism involving competitive binding.
• Monitoring UV/vis spectral shifts and fluorescence enhancement for analyte detection.
• Quantifying a mixture of glutathione and l-cysteine in human blood serum.

Main Results:

• The chemosensor array successfully achieved simultaneous classification and quantification of five SCAAs.
• The coordination-based mechanism involving reversible coumarin-Zn2+ bonds enabled high-accuracy multianalyte detection.
• UV/vis spectral shifts and fluorescence enhancement were observed in response to SCAAs.
• Accurate quantification of glutathione and l-cysteine was achieved in a human blood serum sample.

Conclusions:

• The developed mini-chemosensor array provides a rapid and accurate method for SCAA detection.
• This approach offers a promising platform for optical chemosensor arrays in biomarker analysis.
• The study highlights the potential of coordination chemistry for sensitive and selective sensing applications.