Cholesterol determination using protein-templated fluorescent gold nanocluster probes

Area of Science:

• Biochemistry
• Nanotechnology
• Analytical Chemistry

Background:

• Cholesterol is a critical biomarker for cardiovascular health.
• Accurate and sensitive detection of soluble cholesterol is essential for clinical diagnostics.
• Existing methods for cholesterol quantification can be complex or lack sensitivity.

Purpose of the Study:

• To develop a novel fluorescent biosensor for the sensitive detection of soluble cholesterol.
• To utilize gold nanoclusters and enzymatic reactions for signal generation.
• To establish a platform for rapid and reliable cholesterol measurement.

Main Methods:

• Development of a fluorescent biosensor platform using bovine serum albumin-stabilized gold nanoclusters.
• Incorporation of cholesterol oxidase (ChOx) within a surfactant emulsion system.
• Enzymatic oxidation of cholesterol producing hydrogen peroxide (H2O2) as a by-product.
• Monitoring the H2O2-induced fluorescence quenching response.

Main Results:

• The biosensor demonstrated selective enzymatic oxidation of cholesterol.
• The system produced stoichiometric amounts of H2O2, leading to a detectable fluorescence quenching.
• The sensor achieved a limit of detection (LOD) of approximately 12 μM for soluble cholesterol.
• The platform showed potential for detecting cholesterol at clinically relevant levels.

Conclusions:

• The developed fluorescent biosensor platform is effective for soluble cholesterol detection.
• The combination of gold nanoclusters and ChOx offers a sensitive detection strategy.
• This platform holds promise for future clinical applications in cholesterol monitoring.