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Accurate nucleic acid concentrations by nuclear magnetic resonance
M J Cavaluzzi1, D J Kerwood, P N Borer
1Department of Chemistry and Graduate Program in Structural Biology, Biochemistry, and Biophysics, Syracuse University, Syracuse, NY 13244, USA.
Analytical Biochemistry
|November 7, 2002
Summary
This study presents a nuclear magnetic resonance (NMR) protocol for precise biochemical sample concentration determination. The method achieves +/-1-3% accuracy for millimolar concentrations, improving upon standard techniques.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Spectroscopy
Background:
- Accurate determination of biochemical sample concentrations is crucial for research.
- Traditional methods often suffer from significant uncertainties (10-20% or more).
- Existing nuclear magnetic resonance (NMR) techniques may not provide sufficient precision for certain applications.
Purpose of the Study:
- To detail a protocol for precise concentration measurement of biochemical samples using NMR.
- To achieve accuracy within +/-1-3% for approximately 1mM concentrations.
- To establish a reliable method applicable to various biomolecules.
Main Methods:
- Utilized 500- to 600-MHz NMR spectrometers.
- Employed standardized internal reference compounds (cacodylic acid or DSS).
- Applied signal averaging with long interpulse delays for quantitative proton integration relative to standards.
Main Results:
- Achieved +/-1-3% accuracy for millimolar concentrations.
- Demonstrated applicability to DNA mono- and oligonucleotides.
- Indicated potential for similar accuracy with proteins, polysaccharides, and other biomolecules.
Conclusions:
- The developed NMR protocol offers a significant improvement in accuracy for biochemical sample concentration determination.
- Careful optimization of magnetic field homogeneity, sample preparation, and spectral processing is essential.
- The method holds promise for broad application across various biomolecular analyses.