Simple and Cost-effective Enzymatic Detection of Cholesterol Using Flow Injection Analysis

Area of Science:

• Analytical Chemistry
• Biochemistry
• Electrochemistry

Background:

• Cholesterol measurement is crucial for clinical diagnostics and research.
• Existing methods may have limitations in speed, cost, or applicability for on-line monitoring.
• Enzymatic methods offer high specificity for cholesterol determination.

Purpose of the Study:

• To develop and validate a cost-effective flow-injection analysis (FIA) system for cholesterol determination.
• To utilize enzymatic reactions with cholesterol oxidase (CHOx) and electrochemical detection.
• To assess the system's performance for potential on-line monitoring applications.

Main Methods:

• Development of a flow-injection analysis (FIA) system incorporating a CHOx-immobilized fused-silica capillary.
• Electrochemical detection of hydrogen peroxide produced from cholesterol oxidation.
• Optimization of applied potential (0.6 V vs. Ag/AgCl) and flow rate (100 μL/min).

Main Results:

• The FIA system achieved a linear dynamic range from 50 μM to 1.0 mM.
• Limit of detection (LOD) was 12.4 μM, and limit of quantification (LOQ) was 44.9 μM.
• The system demonstrated good precision with a coefficient of variation of 5.17% and comparable results to clinical kits.

Conclusions:

• The developed FIA system is a cost-effective and reliable method for cholesterol determination.
• Its analytical performance suggests suitability for on-line monitoring of cholesterol in various sample types.
• This methodology offers a valuable tool for both research and potentially clinical applications.