Tuning interionic interaction by rationally controlling solution pH for highly selective colorimetric sensing of...

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Neuroscience

Background:

• Direct sensing of arginine in the central nervous system is vital for understanding neurological functions.
• Current methods may lack selectivity or sensitivity for in vivo applications.

Purpose of the Study:

• To develop a simple and effective method for selective arginine sensing in the central nervous system.
• To utilize gold nanoparticles (Au-NPs) as a signal readout for arginine detection.

Main Methods:

• Employed pH-dependent interionic interactions between cysteine and arginine.
• Utilized cysteine-protected gold nanoparticles (Au-NPs) and monitored changes in color and UV-vis spectra.
• Developed an analytical strategy based on the absorbance ratio (A 650/A 520) at controlled pH values.

Main Results:

• Achieved selective arginine detection without interference from other amino acids or central nervous system species.
• Established a linear relationship between the A 650/A 520 ratio and arginine concentration (0.80–64 μM).
• Demonstrated a reliable and robust sensing method suitable for physiological conditions.

Conclusions:

• The developed method provides a sensitive and selective approach for arginine detection in the central nervous system.
• This technique can be applied to monitor increases in arginine levels, aiding in the study of neurological events.