Micro flow injection analysis combined with a separation technique for the urinary glucose assay

Area of Science:

• Analytical Chemistry
• Biomedical Engineering

Background:

• Accurate measurement of urinary glucose is crucial for diagnosing and monitoring various medical conditions.
• Conventional flow injection analysis (FIA) systems often suffer from interference from other urine components, limiting their accuracy.
• Developing selective and sensitive assays for urinary analytes remains a significant challenge in clinical diagnostics.

Purpose of the Study:

• To develop and validate a micro flow injection analysis (microFIA) system for the selective determination of glucose in artificial urine.
• To integrate a separation technique for glucose preconcentration within a microFIA chip.
• To address the interference issues encountered in conventional FIA methods for urinary analyte analysis.

Main Methods:

• Utilized micro flow injection analysis (microFIA) integrated with activated alumina for selective glucose adsorption and desorption.
• Developed a microFI chip incorporating an adsorption part for preconcentration of glucose from artificial urine.
• Employed deionized water as an eluent, sandwiched with reagents on the carrier stream, to generate a distinct glucose peak.

Main Results:

• The developed microFIA system demonstrated selective preconcentration of glucose from artificial urine.
• Quantitative determination of glucose concentration was achieved with the microFIA system.
• The system effectively minimized interference from other coexisting urine components, unlike conventional FIA.

Conclusions:

• The integrated microFIA system with selective adsorption provides a robust method for accurate urinary glucose quantification.
• This approach offers a template for enhancing analyte selectivity in complex multi-component biological samples.
• The microFIA system presents a promising advancement for improved diagnostic capabilities in urinalysis.