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11 B NMR studies have been performed in dilute solutions of boric acid resp. borate and some typical hydroxy-carboxylic acids as a function of pH. Typical chemical shifts have been found for the esters occurring at the different ranges of pH. The origin of the two  11 B NMR signals observable in wine could be determined.

11 B NMR Investigations of Borate Esters in Aqueous Solutions and Wine