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This article describes a  13 C-labelling and nuclear magnetic resonance approach for hippuric acid test which is potentially useful for evaluating liver reserve. In this approach, urine samples collected after ingestion of  13 C-labelled benzoic acid were directly analysed by  13 C nuclear magnetic resonance spectroscopy, and the excreted  13 C-labelled hippuric acid formed from the administered benzoic acid was quantitated. The amount of labelled hippuric acid excreted in a specified time can be a useful index of liver reserve. In this study, the feasibility of the nuclear magnetic resonance approach has been investigated in several healthy subjects. This approach is simple and convenient compared with conventional analytical procedures, because no chromatographic separation is required. The approach could give new insights into the liver reserve, because the benzoic acid conversion to hippuric acid intimately relates to the hepatic energy metabolism. This measurement can be conducted at a wide range of dosages without interference from endogenous hippuric acid.

Hippuric Acid Test Using 13C-Labelling and NMR Spectroscopy