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We have investigated the reliability of 2D-COSY and 2D-TOCSY experiments to provide accurate measurements of 13 C-enrichments in complex mixtures of 13 C-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 13 C-enrichments, provided efficient...
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