Free and potentially volatile monoterpenes in grape varieties from the Republic of Macedonia

Donka Doneva-Šapčeska, Aco Dimitrovski, Trajko Bojadžiev, Goran Milanov, Borimir Vojnovski

Abstract


The total content of free (FVT) and potentially volatile terpenes (PVT) present in the grape varieties Muscat Hamburg, Muscat Italia, Italian Riesling, Chardonnay, Vranec and Cabernet Sauvignon was determined by using a rapid distillation-colorimetric method. The assays were performed on samples of mature grapes. The FVT and PVT correlated with the recognized aroma characteristics of the cultivars examined. The level of free monoterpenes in the skin, the pulp, and the juice from the Muscat Italia grape was lower than the level of bound monoterpenes. Most of the free monoterpenes were located in the skin. However, the calculated contents of the FVT and the PVT present in the skin were much lower when expressed on the whole berry. Additionally, the contents of FVT and PVT in grape waste obtained after pressing was examined. The quantity of potentially volatile monoterpene components determined in the grape varieties investigated opens up the possibility of enhanceing the free monoterpene contents in the wine-making process.


Keywords


grape; free volatile terpenes; potentially volatile terpenes

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