Indirect laser photoacoustic detection for trace samples on membranes

Area of Science:

• Analytical Chemistry
• Spectroscopy
• Chemical Sensing

Background:

• Photoacoustic spectroscopy offers a sensitive method for detecting analytes.
• Quantification of specific biomolecules and dyes on membrane surfaces presents analytical challenges.

Purpose of the Study:

• To describe an indirect laser photoacoustic technique.
• To detail the experimental setup and influencing factors of the technique.
• To quantify phenylamine, arginine, and methylene blue on membranes using this method.

Main Methods:

• Utilized an indirect laser photoacoustic approach.
• Detailed the experimental setup and key influencing parameters.
• Applied the technique to analyze phenylamine, arginine, and methylene blue concentrations on membrane substrates.

Main Results:

• Established linear calibration curves with ranges spanning up to two orders of magnitude.
• Achieved low picomole detection limits: 0.25 pmol for phenylamine, 1.52 pmol for arginine, and 0.14 pmol for methylene blue.
• Demonstrated successful quantification of the target analytes on membrane supports.

Conclusions:

• The indirect laser photoacoustic technique is effective for sensitive quantification of analytes on membranes.
• The method exhibits a wide linear dynamic range and excellent detection limits for phenylamine, arginine, and methylene blue.
• This technique holds potential for various applications requiring precise analyte determination on solid supports.