A fast NMR method for resonance assignments: application to metabolomics

作者：Pudakalakatti Shivanand M; Dubey Abhinav; Jaipuria Garima; Shubhashree U; Adiga Satish Kumar; Moskau Detlef; Atreya Hanudatta S^*

来源：Journal of Biomolecular NMR, 2014, 58(3): 165-173.

DOI：10.1007/s10858-014-9814-6

• GFT NMR
• Multiple receivers
• Metabolomics
• 2D HSQC-TOCSY
• Assisted reproductive technology

We present a new method for rapid NMR data acquisition and assignments applicable to unlabeled (C-12) or C-13-labeled biomolecules/organic molecules in general and metabolomics in particular. The method involves the acquisition of three two dimensional (2D) NMR spectra simultaneously using a dual receiver system. The three spectra, namely: (1) G-matrix Fourier transform (GFT) (3,2)D [C-13, H-1] HSQC-TOCSY, (2) 2D H-1-H-1 TOCSY and (3) 2D C-13-H-1 HETCOR are acquired in a single experiment and provide mutually complementary information to completely assign individual metabolites in a mixture. The GFT (3,2)D [C-13, H-1] HSQC-TOCSY provides 3D correlations in a reduced dimensionality manner facilitating high resolution and unambiguous assignments. The experiments were applied for complete H-1 and C-13 assignments of a mixture of 21 unlabeled metabolites corresponding to a medium used in assisted reproductive technology. Taken together, the experiments provide time gain of order of magnitudes compared to the conventional data acquisition methods and can be combined with other fast NMR techniques such as non-uniform sampling and covariance spectroscopy. This provides new avenues for using multiple receivers and projection NMR techniques for high-throughput approaches in metabolomics.

• 出版日期2014-3