FRACTIONATION OF GLYCOSIDE PRECURSORS OF AROMA IN GRAPES AND WINE

The glycosides in mono-, di-and trihydroxylated terpene and norisopren oid alcohols and also those in the related shikimate pathway have been isolated on C-18 reversed-phase cartridges and then fractionated into classes of different polarity at increasing percentages of methanol. The benzyl alcohol glycosides are the most polar, while those of terpe ne monohydroxylated alcohols and geranic acid are the least polar. The terpene diols, linalool furanoid and pyranoid oxides and also norisop renoid precursors show intermediate polarity and separate into well de fined fractions according to their polarity. (C) 1997 Elsevier Science B.V.