A highly sensitive gold nanoparticle-based colorimetric probe for pyrophosphate using a competition assay approach

Area of Science:

• Analytical Chemistry
• Nanotechnology
• Biochemistry

Background:

• Pyrophosphate (PPi) is a crucial biomarker in various biological processes.
• Sensitive and rapid detection of PPi is essential for diagnostic applications.
• Existing detection methods often require complex instrumentation.

Purpose of the Study:

• To develop a highly sensitive colorimetric probe for pyrophosphate (PPi) detection.
• To utilize a novel combination of a zinc complex and functionalized gold nanoparticles.
• To enable naked-eye detection of PPi at low concentrations.

Main Methods:

• Synthesis of [Zn(2)(1,3-bis[bis(2-pyridylmethyl)aminomethyl]benzene)](4+) ([Zn(2)(BBPAB)](4+)) complex.
• Preparation of 11-mercaptoundecylphosphoric acid functionalized gold nanoparticles (Phos-AuNPs).
• Combination of [Zn(2)(BBPAB)](4+) and Phos-AuNPs to create a colorimetric probe for PPi detection.

Main Results:

• The developed probe demonstrated high sensitivity for pyrophosphate (PPi) detection.
• PPi was detected at concentrations below 200 nM.
• The colorimetric change was observable with the naked eye, indicating PPi presence.

Conclusions:

• The [Zn(2)(BBPAB)](4+)/Phos-AuNPs mixture serves as an effective colorimetric probe for PPi.
• This method offers a simple, sensitive, and naked-eye detectable approach for PPi quantification.
• The probe has potential applications in biochemical assays and diagnostics requiring PPi detection.