An efficient chromatographic system for lipoprotein fractionation using whole plasma

Area of Science:

• Clinical Chemistry
• Biochemistry
• Analytical Chemistry

Background:

• Accurate quantification of plasma lipoproteins is crucial for cardiovascular risk assessment.
• Existing methods for lipoprotein isolation and quantification can be time-consuming and require large sample volumes.

Purpose of the Study:

• To validate a semi-automatic Fast Phase Liquid Chromatography (FPLC) procedure for efficient isolation of plasma lipoproteins.
• To establish modified enzymatic assays for determining low concentrations of triglycerides and cholesterol.
• To compare FPLC-based quantification with established methods like dextran sulfate/MgCl2 precipitation and ultracentrifugation.

Main Methods:

• Plasma lipoproteins were isolated using a semi-automatic FPLC system with a 200 microl injection volume.
• Modified enzymatic assays were employed for triglyceride and cholesterol determination using a Beckman CX-5 Autoanalyzer.
• FPLC results for cholesterol and triglyceride levels in low-density lipoprotein (LDL) and high-density lipoprotein (HDL) fractions were correlated with precipitation and ultracentrifugation methods.

Main Results:

• The FPLC method demonstrated high correlation with established methods for HDL cholesterol (r2 = 0.997) and LDL cholesterol (r2 = 0.988).
• Linear detection ranges were established for HDL cholesterol (18-95 mg/dl) and LDL cholesterol (41-435 mg/dl).
• Low fractional standard deviations were observed for quadruplicate runs across a wide range of lipoprotein concentrations.

Conclusions:

• The validated semi-automatic FPLC procedure offers an efficient and accurate method for plasma lipoprotein isolation and quantification.
• This method is suitable for determining low concentrations of triglycerides and cholesterol in LDL and HDL fractions.
• The FPLC approach provides a reliable alternative to traditional methods, with high precision and accuracy.