High-Precision Micro-Total Analysis of Sodium Ions in Breast Milk

Area of Science:

• Biomedical Engineering
• Analytical Chemistry
• Materials Science

Background:

• Sodium ion concentration in breast milk offers vital health insights for mothers and infants.
• Conventional methods for sodium analysis are time-consuming, costly, and require specialized expertise.
• There is a need for rapid, precise, and accessible diagnostic tools for breast milk analysis.

Purpose of the Study:

• To develop a compact, high-precision lab-on-a-chip device for detecting sodium ions in human breast milk.
• To enable efficient and accurate quantification of sodium levels at the point-of-care.
• To provide a faster alternative to traditional diagnostic methods for breast milk analysis.

Main Methods:

• Development of a coverslip-sized lab-on-a-chip device integrating micro-electrodialysis and a graphene ion-selective sensor.
• Utilizing micro-electrodialysis for efficient extraction of sodium ions into an acceptor solution (92 ± 3% efficiency).
• Employing a straightforward calibration strategy for rapid quantification of sodium ions.

Main Results:

• The developed device accurately measures sodium ion levels in human breast milk within 141 seconds.
• Achieved accuracy comparable to established methods like inductively coupled plasma mass spectrometry.
• Demonstrated the device's capability for high-performance quantification of sodium ions.

Conclusions:

• The lab-on-a-chip device offers a significant advancement for analyzing sodium ion concentrations in breast milk.
• This technology provides a promising avenue for efficient, point-of-care diagnostics related to metal-ion imbalances in complex biological samples.
• The developed sensor system facilitates timely identification of health issues linked to sodium levels in breast milk.