Abstract
We have investigated the reliability of 2D-COSY and 2D-TOCSY experiments to provide accurate measurements of 13C-enrichments in complex mixtures of 13C-labelled metabolites. This was done from both theoretical considerations and experimental investigations. The results showed that 2D-TOCSY but not 2D-COSY could provide accurate measurements of 13C-enrichments, provided efficient zero-quantum filters were applied during the mixing period. This approach extends the range of NMR methods applicable in 13C-labelling experiments and is suitable to investigating the dynamic behaviour of metabolic systems.
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