PT - JOURNAL ARTICLE AU - P. J. Williams AU - C. R. Strauss AU - B. Wilson TI - Classification of the Monoterpenoid Composition of Muscat Grapes AID - 10.5344/ajev.1981.32.3.230 DP - 1981 Jan 01 TA - American Journal of Enology and Viticulture PG - 230--235 VI - 32 IP - 3 4099 - http://www.ajevonline.org/content/32/3/230.short 4100 - http://www.ajevonline.org/content/32/3/230.full SO - Am J Enol Vitic.1981 Jan 01; 32 AB - Muscat of Alexandria grape juice stripped first with pentane and then with Freon F11 is left with residual monoterpene precursor substances. The pentane extract of the juice contains the known free terpenes of the fruit whereas Freon extracts more polar polyhydroxylated monoterpenes (polyols). These latter components are now recognized as free terpenes also. The residual monoterpene precursors in the solvent-stripped juice are derivatized as water-soluble conjugated compounds. Acid hydrolysis of the precursor compounds gives, in addition to most of the known volatile terpenoid aroma substances of the grape, the highly reactive polyols.The experiments confirm the presence of only two forms of muscat grape monoterpenoids, a) the free, and b) the conjugated precursor forms.