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Please use this identifier to cite or link to this item:
http://hdl.handle.net/10174/42293
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| Title: | GC×GC–TOFMS with flow modulation for fingerprinting volatile compounds in Portuguese grape varieties |
| Authors: | Fonseca, Daniela
Martins, Nuno
Garcia, Raquel
Cabrita, Maria João |
| Keywords: | Comprehensive two-dimensional gas chromatography
Flow modulation
Volatile compounds
Water stress
Grapes |
| Issue Date: | 2026 |
| Publisher: | Microchemical Journal /Elsevier |
| Abstract: | Comprehensive two-dimensional gas chromatography offers a powerful analytical tool for profiling volatile
compounds in complex matrices. The characterization of grapevine varieties that are resilient to water stress,
such as autochthonous varieties, while safeguarding quality characteristics, is fundamental to viticulture. For this
reason, the objective of this study was to characterize the volatile composition of four white varieties from the
Alentejo region (Portugal), subjected to three different irrigation regimes: water comfort, moderate water deficit,
and rainfed. The first step was to optimize the modulation conditions, and it was found that the most effective
modulation period was 5 s, with a flush time of 0.20 s. After optimizing these conditions, the grapes of the
Diagalves, Manteúdo, Perrum and Rabo de Ovelha varieties were analyzed by HS-SPME-GC×GC-TOFMS.
A total of seventy-six volatile compounds, of which fifty-one were varietal volatiles, were identified and semiquantified in these varieties. The results reveal that the irrigation regime influences the volatile profile with
varying responses across the varieties. While Diagalves exhibited no significant differences between irrigation
regimes, Manteúdo and Perrum demonstrated higher levels of varietal volatile compounds, particularly terpenes
and C13 norisoprenoids, under rainfed conditions. According to PCA, irrigation regimes affect each variety
differently. In conclusion, Manteúdo and Perrum emerge as the most statistically promising varieties in terms of
adaptability to water scarcity. These findings highlight the significance of selecting resilient autochthonous grape
varieties as an effective strategy to mitigate the impacts of climate change while maintaining the wine's
distinctive aromatic character. |
| URI: | http://hdl.handle.net/10174/42293 |
| Type: | article |
| Appears in Collections: | MED - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
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