Highly Repeatable Dissolution Dynamic Nuclear Polarization for Heteronuclear NMR Metabolomics.

Area of Science:

• Analytical Chemistry
• Biochemistry
• Spectroscopy

Background:

• Metabolomics using heteronuclear Nuclear Magnetic Resonance (NMR) spectroscopy is often limited by low sensitivity, especially at natural (13)C abundance.
• Hyperpolarization techniques, such as dissolution dynamic nuclear polarization (D-DNP) with cross-polarization (CP), have shown promise in enhancing NMR sensitivity for dilute metabolite mixtures.

Purpose of the Study:

• To evaluate the precision and repeatability of the D-DNP assisted by CP method for heteronuclear NMR applications in metabolomics.
• To assess the suitability of this enhanced NMR technique for detecting subtle biological variations in complex samples.

Main Methods:

• Utilized dissolution dynamic nuclear polarization (D-DNP) coupled with cross-polarization (CP) to enhance NMR signal sensitivity.
• Applied the technique to analyze 20 mg dry weight tomato extracts, a sample type relevant to metabolomics.
• Quantified the repeatability of the D-DNP NMR equipment across detected signals.

Main Results:

• Achieved an average repeatability of 3.6% for signals above the limit of quantification (LOQ).
• Reported an average repeatability of 6.4% when considering all signals above the limit of detection (LOD).
• This represents the first report on the repeatability of D-DNP for metabolomic samples.

Conclusions:

• The D-DNP assisted by CP technique demonstrates high repeatability, meeting the stringent requirements for metabolomics applications.
• The enhanced sensitivity and precision confirm the potential of D-DNP NMR as a powerful analytical tool for metabolomics research.
• This method facilitates the detection of small, biologically significant differences between samples, advancing the field of metabolite analysis.