Application of quantum dots in clinical and alimentary fields using multicommutated flow injection analysis

Area of Science:

• Analytical Chemistry
• Materials Science
• Nanotechnology

Background:

• Quantum dots (QDs) show increasing application in scientific research, particularly for novel analytical methods.
• Automated methodologies, such as Multicommutated Flow Injection Analysis (MFIA), are a key trend in modern analysis.
• MFIA offers potential for efficient analysis in pharmaceutical and food sectors.

Purpose of the Study:

• To develop and validate an automated flow system for ascorbic acid determination using quantum dots.
• To demonstrate the utility of Multicommutated Flow Injection Analysis (MFIA) with QDs for practical applications.
• To assess the performance of the developed method in real-world samples.

Main Methods:

• Utilized water-soluble Cadmium Telluride (CdTe) quantum dots modified with mercaptopropionic acid.
• Developed a flow injection analysis system based on the fluorescence quenching effect of ascorbic acid on QDs.
• Optimized reaction conditions for maximum sensitivity and efficiency.

Main Results:

• Established a linear relationship between fluorescence intensity and ascorbic acid concentration from 12-250 μg mL⁻¹.
• Achieved a high sample throughput of 68 determinations per hour.
• Validated the method by analyzing ascorbic acid in pharmaceutical formulations, goji capsules, and fruit juices.

Conclusions:

• The proposed automated method using QDs is effective for determining ascorbic acid in pharmaceutical and food samples.
• Results showed good agreement with a reference method, confirming the technique's reliability.
• The developed system demonstrates significant utility for clinical and food analysis applications.