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Apolipoprotein B-48 analysis by high-performance liquid chromatography in VLDL: a sensitive and rapid method
H Hidaka1, H Kojima, Y Nakajima
1Third Department of Medicine, Shiga University of Medical Science, Japan.
Summary
High-performance liquid chromatography (HPLC) effectively separates apolipoprotein (apo) B subspecies, enabling easier analysis of apo B-48 in very-low-density lipoproteins (VLDL). This reliable method aids in studying apo B metabolism in various lipoprotein conditions.
Area of Science:
- Lipid Metabolism
- Protein Biochemistry
- Analytical Chemistry
Background:
- Apolipoprotein B (apo B) exists as distinct subspecies, apo B-100 and apo B-48.
- Accurate quantification of apo B subspecies, particularly apo B-48 in very-low-density lipoproteins (VLDL), is crucial for understanding lipoprotein metabolism.
- Existing methods for apo B subspecies analysis can be complex or lack precision.
Purpose of the Study:
- To develop and validate a high-performance liquid chromatography (HPLC) method for the separation and analysis of apolipoprotein B subspecies.
- To accurately quantify apolipoprotein B-48 (% B-48) content in various lipoprotein fractions, including VLDL.
- To assess the reliability and ease of use of the developed HPLC method for studying apo B metabolism.
Main Methods:
- Separation of apo B-100 and apo B-48 using a Shim-pack Diol-300 column system via HPLC.
- Determination of molecular masses and retention times for apo B-100 and apo B-48.
- Quantification of % B-48 in chylomicrons, fasting VLDL, and postprandial VLDL by measuring HPLC peak areas; validation with SDS-PAGE and radioactivity measurements.
Main Results:
- HPLC successfully separated apo B-100 (24 min, ~600 kDa) and apo B-48 (32.3 min, ~220 kDa).
- % B-48 in healthy subjects: 76% (chylomicrons), 13% (fasting VLDL), 20% (postprandial VLDL); none detected in LDL.
- HPLC method showed high recovery (91-95%), good reproducibility (CV 2.5%), and strong correlation with SDS-PAGE, with % B-48 in VLDL positively related to VLDL triglyceride and cholesterol.
Conclusions:
- The developed HPLC method provides a reliable and straightforward approach for analyzing apo B subspecies, specifically apo B-48 in VLDL.
- This technique is suitable for studying apo B metabolism in triglyceride-rich lipoproteins under both physiological and pathological conditions.
- The HPLC method offers a valuable tool for clinical and research settings investigating lipoprotein disorders.