Grape mistelles are much better than grape C18-extracts to study grape aromatic potential

González-Martínez, Belén (Universidad de Zaragoza) ; de-la-Fuente-Blanco, Arancha (Universidad de Zaragoza) ; Peña, Cristina (Universidad de Zaragoza) ; Ferreira, Vicente (Universidad de Zaragoza)

Resumen: The aromatic compositions of hydrolysates containing grape aroma precursors obtained by two different procedures were compared. The first procedure used simply diluted mistelle, while the second employed a reconstituted C18 extract of the original mistelle containing both aromatic precursors and polyphenols. Hydrolysis was carried out under strict anoxic conditions at 75 °C and pH 3.5 for varying times (0–190 h). Varietal aroma compounds were analysed by GC-SCD (volatile sulphur compounds, VSCs), GC-MS (minor volatile compounds) and HPLC-MS (polyfunctional mercaptans, PFM’s). Odorants were additionally controlled by GC-O. Aromas and aroma precursors lost during sample extraction were also investigated. Results revealed that polar precursors of relevant varietal aroma compounds, including DMS, limonene, dihydromyrcenol, geraniol, linalool, β-ionone, γ-nonalactone and vinylphenols are lost during C18 extraction, which demonstrates that traditional aroma precursor research has missed a significant fraction of precursors. On the other hand, hydrolysed mistelles accumulated high levels of H2S and DMS, low levels of MH due to the presence of sugars, and developed detectable levels of amino acid related odorants, such as phenylacetaldehyde and 2-acetylpyrazine. While this explains why mistelles are not the best choice for sensory evaluation, also demonstrates that they are much better for the chemical assessment of grape aromatic potential.

Idioma: Inglés

DOI: 10.1016/j.lwt.2025.117650

Año: 2025

Publicado en: LWT-FOOD SCIENCE AND TECHNOLOGY 222 (2025), 117650 [11 pp.]
ISSN: 0023-6438

Financiación: info:eu-repo/grantAgreement/ES/AEI/PID2021-126031OB-C21
Financiación: info:eu-repo/grantAgreement/ES/DGA/T29

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Química Analítica (Dpto. Química Analítica)