TY - JOUR T1 - The Distribution of Free and Glycosidically-Bound Monoterpenes Among Skin, Juice, and Pulp Fractions of Some White Grape Varieties JF - American Journal of Enology and Viticulture JO - Am J Enol Vitic. SP - 107 LP - 111 DO - 10.5344/ajev.1986.37.2.107 VL - 37 IS - 2 AU - B. Wilson AU - C. R. Strauss AU - P. J. Williams Y1 - 1986/01/01 UR - http://www.ajevonline.org/content/37/2/107.abstract N2 - The amount of free and glycosidically-bound forms of linalool, geraniol, nerol, α-terpineol, cis- and trans-furan linalool oxides, cis- and trans-pyran linalool, oxides, and diendiol I (3,7-dimethylocta-l,5-diene-3,7-diol) were determined in the skin, juice (serum), and pulp (pellet) fractions of mature Muscat of Alexandria, White Frontignac, and Traminer grapes. The pulp fractions of the grapes were found to have terpene compositions reflecting those of the juices. In all the varieties, free geraniol and nerol were associated mostly with the skins of the berries. Free linalool and diendiol I were uniformly distributed between skin and juice of the two muscats, and Traminer contained very little of either of these monoterpenes. Glycosylation effectively redistributes the monoterpenes throughout the berry fractions. The linalool oxides were lesser terpenes of the three varieties, with cis- and trans-furan linalool oxides present principally as glycosides in both skin and juice. The pyran linalool oxides were found mainly free in the juices. α-Terpineol and its glycosides were minor components of all the varieties. From the distribution patterns, it is clear that free aroma substances as well as potential flavorants of the grape are not concentrated solely in the skins of the berries but are present in the juice as well. ER -