| Title: | The Varietal Influence of Flavour Precursors from Grape Marc on Monoterpene and C(13)-Norisoprenoid Profiles in Wine as Determined by Membrane-Assisted Solvent Extraction (MASE) GC-MS |
| Author(s): | Pisaniello L; Watson F; Siebert T; Francis L; Hixson JL; |
| Address: | "The Australian Wine Research Institute, P.O. Box 197, Glen Osmond, SA 5064, Australia" |
| DOI: | 10.3390/molecules27072046 |
| ISSN/ISBN: | 1420-3049 (Electronic) 1420-3049 (Linking) |
| Abstract: | "The winemaking by-product grape marc (syn. pomace) contains significant quantities of latent flavour in the form of flavour precursors which can be extracted and used to modulate the volatile composition of wine via chemical hydrolysis. Varietal differences in grapes are widely known with respect to their monoterpene content, and this work aimed to extend this knowledge into differences due to cultivar in volatiles derived from marc precursors following wine-like storage conditions. Marc extracts were produced from floral and non-floral grape lots on a laboratory-scale and from Muscat Gordo Blanco marc on a winery -scale, added to a base white wine for storage over five to six months, before being assessed using a newly developed membrane-assisted solvent extraction gas chromatography-mass spectrometry (GC-MS) method. The geraniol glucoside content of the marc extracts was higher than that of juices produced from each grape lot. In all wines with added marc extract from a floral variety, geraniol glucoside concentration increased by around 150-200%, with increases also observed for non-floral varieties. The relative volatile profile from extracts of the floral varieties was similar but had varied absolute concentrations. In summary, while varietally pure extracts would provide the greatest control over flavour outcomes when used in winemaking, aggregated marc parcels from floral cultivars may provide a mechanism to simplify the production logistics of latent flavour extracts for use in the wine sector" |
| Keywords: | Flavoring Agents/analysis Gas Chromatography-Mass Spectrometry Glucosides/analysis Monoterpenes/analysis Norisoprenoids/analysis Plant Extracts/analysis Solvents/analysis *Vitis/chemistry *Wine/analysis by-product glycosides hydrolysis membrane-assisted s; |
| Notes: | "MedlinePisaniello, Lisa Watson, Flynn Siebert, Tracey Francis, Leigh Hixson, Josh L eng AWRI block grant/Wine Australia/ Switzerland 2022/04/13 Molecules. 2022 Mar 22; 27(7):2046. doi: 10.3390/molecules27072046" |
