Innovative Electrochemical Sensor Using TiO₂ Nanomaterials to Detect Phosphopeptides

Area of Science:

• Biochemistry
• Analytical Chemistry
• Materials Science

Background:

• Phosphopeptide enrichment often uses metal ion interactions.
• Existing methods may lack sensitivity or selectivity for direct detection.

Purpose of the Study:

• To develop a sensitive and rapid electrochemical sensor for phosphopeptide detection.
• To investigate the use of TiO2 nanoparticles and AuNPs for enhanced detection.

Main Methods:

• Fabrication of an electrochemical sensor using TiO2 nanoparticles (NPs) and AuNPs.
• Utilizing the specific binding of TiO2 NPs to phosphate groups and AuNPs for improved electron conduction.
• Synthesis and characterization of TiO2 and graphene oxide (GO) composite materials.

Main Results:

• The sensor demonstrated high sensitivity, selectivity, and repeatability for phosphopeptides.
• Achieved a wide linear concentration range (1 pg/L to 1 mg/L) and a low limit of detection (0.24 pg/L).
• TiO2 and GO composite materials further improved detection, yielding a limit of detection as low as 0.37 ag/L.

Conclusions:

• The developed electrochemical sensor provides a novel and effective strategy for direct phosphopeptide detection.
• The use of TiO2 NPs, AuNPs, and GO composites enhances sensing capabilities.
• This approach offers a promising solution for analyzing phosphate groups in complex biological samples.