Paper on Methodology

Characterization and quantitation of apolipoprotein B-100 by capillary electrophoresis

Correspondence to: Ronald D. Macfarlane.

The interaction of low density lipoproteins (LDL) with different surfactants was studied by capillary electrophoresis (CE) and sucrose density gradient ultracentrifugation as part of developing a method for quantitation of apoB -100 in serum. A mixture of surfactants consisting of 70% sodium dodecyl sulfate (SDS), 25% sodium myristyl sulfate, and 5% sodium cetyl sulfate was found to delipidate LDL particles more effectively than pure SDS or sodium decyl sulfate. The delipidation products of LDL [apolipoprotein B-100 (apoB -100) and lipids] were resolved as two distinct peaks by CE when using a 3.5 mM 70% SDS mixture, 20% (v/v) acetonitrile, 50 mM sodium borate, pH 9.1 buffer. This CE method was also used to characterize apoB -100 derived from samples of lipoprotein [a] and very low density lipoproteins (VLDL). A CE-based quantitation method for apoB -100 was developed utilizing the observed linear relationship between apoB -100 concentration and its corrected 214 nm absorbance peak area measured on-line by CE. Concentration values of apoB -100 in LDL and VLDL samples were determined by CE and found to be accurate when compared to values obtained by immunoturbidimetric analysis and the Lowry method. Capillary electrophoresis can be used as a precise, accurate, and specific on-line method for the qualitative and quantitative analysis of the apoB -100 component of VLDL and LDL-related lipoproteins.—Cruzado, I. D., S. L. Cockrill, C. J. McNeal, and R. D. Macfarlane. Characterization and quantitation of apolipoprotein B -100 by capillary electrophoresis. J. Lipid Res. 1998. 39: 205–217.

Supplementary key words: ultracentrifugation, low density lipoproteins, very low density lipoproteins, lipoprotein[a], sodium dodecyl sulfate, delipidation

CiteULike    Complore    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this?

This article has been cited by other articles:

				A. Schlenck, B. Herbeth, G. Siest, and S. Visvikis Characterization and quantification of serum lipoprotein subfractions by capillary isotachophoresis: relationships with lipid, apolipoprotein, and lipoprotein levels J. Lipid Res., November 1, 1999; 40(11): 2125 - 2133. [Abstract] [Full Text]

				P. V. Bondarenko, S. L. Cockrill, L. K. Watkins, I. D. Cruzado, and R. D. Macfarlane Mass spectral study of polymorphism of the apolipoproteins of very low density lipoprotein J. Lipid Res., March 1, 1999; 40(3): 543 - 555. [Abstract] [Full Text]