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Colorimetric sensor array for versatile detection and discrimination of model analytes with environmental relevance
Mina Adampourezare1,2, Behzad Nikzad1, Sanaz Sajedi-Amin3
1Research Center of Bioscience and Biotechnology, University of Tabriz, Tabriz, Iran.
BMC Chemistry
|April 22, 2024
Summary
A smartphone colorimetric sensor array accurately identifies and differentiates organic and inorganic bases using pattern recognition. This low-cost method offers a sensitive approach for detecting pollutants.
Area of Science:
- Analytical Chemistry
- Chemical Sensing
- Environmental Monitoring
Background:
- Accurate identification of organic and inorganic bases is crucial for environmental and industrial applications.
- Existing methods for base detection can be complex, costly, or time-consuming.
- Development of rapid, sensitive, and portable detection systems is highly desirable.
Purpose of the Study:
- To develop a rapid, simple, low-cost, and sensitive smartphone-based colorimetric sensor array for determining and differentiating various organic and inorganic bases.
- To utilize pattern recognition methods for quantitative analysis of the sensor array's color changes.
- To assess the system's sensitivity, precision, and potential for practical applications.
Main Methods:
- A sensor array composed of color-sensitive dyes (Fuchsine, Giemsa, Thionine, CoCl2) was employed.
- Color changes were observed visually and recorded using digital imaging in RGB space.
- Quantitative analysis was performed using color calibration, linear discriminant analysis (LDA), and hierarchical clustering analysis (HCA).
Main Results:
- Distinctive colorimetric patterns were generated for different bases, allowing for differentiation.
- Analytes were clustered effectively by class and concentration (0.001-1.0 mol L-1) in LDA and HCA plots.
- High sensitivity and an overall precision of 85% were achieved.
- LDA showed strong correlation (R2 range: 0.864-0.996) between the first function factor and analyte concentration.
Conclusions:
- The proposed smartphone-based colorimetric sensor array is a promising tool for the facile detection and differentiation of organic and inorganic bases.
- The system demonstrates potential for practical applications in areas such as package technology and environmental pollutant monitoring.
- This approach offers a sensitive, low-cost, and rapid alternative to traditional analytical methods.
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