Exploring the effects of geographical origin on the chemical composition and quality grading of Vitis vinifera L. Cv. chardonnay grapes

Gambetta, J, Cozzolino, D, Bastian, S and Jeffery, D 2017, 'Exploring the effects of geographical origin on the chemical composition and quality grading of Vitis vinifera L. Cv. chardonnay grapes', Molecules, vol. 22, no. 2, pp. 1-17.


Document type: Journal Article
Collection: Journal Articles

Title Exploring the effects of geographical origin on the chemical composition and quality grading of Vitis vinifera L. Cv. chardonnay grapes
Author(s) Gambetta, J
Cozzolino, D
Bastian, S
Jeffery, D
Year 2017
Journal name Molecules
Volume number 22
Issue number 2
Start page 1
End page 17
Total pages 17
Publisher M D P I AG
Abstract The relationship between berry chemical composition, region of origin and quality grade was investigated for Chardonnay grapes sourced from vineyards located in seven South Australian Geographical Indications (GI). Measurements of basic chemical parameters, amino acids, elements, and free and bound volatiles were conducted for grapes collected during 2015 and 2016. Multiple factor analysis (MFA) was used to determine the sets of data that best discriminated each GI and quality grade. Important components for the discrimination of grapes based on GI were 2-phenylethanol, benzyl alcohol and C6 compounds, as well as Cu, Zn, and Mg, titratable acidity (TA), total soluble solids (TSS), and pH. Discriminant analysis (DA) based on MFA results correctly classified 100% of the samples into GI in 2015 and 2016. Classification according to grade was achieved based on the results for elements such as Cu, Na, Fe, volatiles including C6 and aryl alcohols, hydrolytically-released volatiles such as (Z)-linalool oxide and vitispirane, pH, TSS, alanine and proline. Correct classification through DA according to grade was 100% for both vintages. Significant correlations were observed between climate, GI, grade, and berry composition. Climate influenced the synthesis of free and bound volatiles as well as amino acids, sugars, and acids, as a result of higher temperatures and precipitation.
Subject Quality Assurance, Chemometrics, Traceability and Metrological Chemistry
Keyword(s) Chardonnay
geographical indication
volatile composition
elements
multiple factor analysis
DOI - identifier 10.3390/molecules22020218
Copyright notice © 2017 by the authors; licensee MDPI, Basel, Switzerland.
ISSN 1420-3049
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