Particle size measurement of lipoprotein fractions using diffusion-ordered NMR spectroscopy
Abstract
The sizes of certain types of lipoprotein particles have been associated with an increased risk of cardiovascular disease. However, there is currently no gold standard technique for the determination of this parameter. Here, we propose an analytical procedure to measure lipoprotein particles sizes using diffusion-ordered nuclear magnetic resonance spectroscopy (DOSY). The method was tested on six lipoprotein fractions, VLDL, IDL, LDL1, LDL2, HDL2, and HDL3, which were obtained by sequential ultracentrifugation from four patients. We performed a pulsed-field gradient experiment on each fraction to obtain a mean diffusion coefficient, and then determined the apparent hydrodynamic radius using the Stokes–Einstein equation. To validate the hydrodynamic radii obtained, the particle size distribution of these lipoprotein fractions was also measured using transmission electron microscopy (TEM). The standard errors of duplicate measurements of diffusion coefficient ranged from 0.5% to 1.3%, confirming the repeatability of the technique. The coefficient of determination between the hydrodynamic radii and the TEM-derived mean particle size was r 2 = 0.96, and the agreement between the two techniques was 85%. Thus, DOSY experiments have proved to be accurate and reliable for estimating lipoprotein particle sizes.
Keywords
Lipoprotein NMR DOSY TEMAbbreviations
- CVD
Cardiovascular disease
- DOSY
Diffusion-ordered NMR spectroscopy
- DSTE
Double-stimulated echo
- GGE
Gradient gel electrophoresis
- HDL
High-density lipoprotein
- IDL
Intermediate density lipoprotein
- LDL
Low-density lipoprotein
- LED
Longitudinal eddy current delay
- LS
Light scattering
- NMR
Nuclear magnetic resonance
- PFG
Pulsed-field gradient
- RMSPE
Root mean squared percentage error
- sdLDL
Small, dense LDL
- SE
Standard error
- SNR
Signal-to-noise ratio
- TEM
Transmission electron microscopy
- TSP
3-Trimethylsilyl[2,2,3,3-d4]propionate
- VLDL
Very low-density lipoprotein
Notes
Acknowledgments
We acknowledge CIBER de Diabetes y Enfermedades Metabólicas Asociadas (ISCIII, Ministerio de Ciencia e Innovación), for partially funding this work, as well as the FIS (project PI 081409). This work was partly supported by the Engineering and Physical Sciences Research Council (Grant Numbers EP/H024336/1 and EP/I007989/1). We also acknowledge Dr. M. Moncusí and Dr. R. Marimon for their assistance with the TEM analysis of the lipoprotein fractions as well as Dr. S. Pujol for her assistance with viscosity measurements.
Supplementary material
References
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