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Identifier

000364412

Title

Προσδιορισμός αρωματικών ουσιών στο σταφύλι και στον οίνο, συνάρτηση με την ωρίμανσή τους σε τοπικές ποικιλίες σταφυλιών

Alternative Title

Determination of volatile compounds in grapes and wine of local varieties

Author

Γιαλιτάκης, Γεώργιος Μάρκου.

Thesis advisor

Κατερινόπουλος, Χαράλαμπος

Abstract

Crete has been long considered as one of the three largest viticulture areas in Greece. Vilana is the major variety of white wine-producing grapes cultivated in Crete. It grows in the areas of the prefectures of Heraklion and Lasithi, and to a lesser extent in the other two prefectures of the island. It is used mainly in the production of the V.Q.P.R.D. “Peza” and “Sitia” white wine brands. One of the major concerns during the wine-making process, using Vilana grapes, is to reach the optimal aromatic character in the wine - a delicate process influenced by a number of factors. In this study, an attempt was made to relate the optimal aromatic character of both, grape samples and the wine produced from each sampling, to the “grape-ripening factor”. In the Vilana grapes, the volatile components detected were mainly hydrocarbons, indicating that this grape variety is exceptionally poor in primary aromatic metabolites, while the Vilana wine was rather rich in ester-type secondary metabolites. Given the volatile nature of the aromatic components, their isolation demanded extraction procedures using both, an ether-pentane mixture and Freon 141, followed by careful distillation of extraction solvents. Identification of the components of the resulting essential oils was achieved by the use of Gas Chromatography coupled with Mass Spectrometry. Evaluation of the results of the wine essential oil analysis in combination with Gustative Analysis data, such as component detection thresholds, indicated that the optimal aromatic character in the wine is reached when the “ripening factor” values of the collected grapes range between 40 and 50.

Language

Greek

Subject

Aroma

Αέρια χρωματογραφία

Κρασί

Πτητικά αρώματα

Ωρίμανση

Issue date

2010-12-14

Collection

School/Department--School of Sciences and Engineering--Department of Chemistry--Post-graduate theses