| Title: | Harvest date effects on aroma compounds in aged Riesling icewines |
| Author(s): | Khairallah R; Reynolds AG; Bowen AJ; |
| Address: | "Cool Climate Oenology & Viticulture Institute, Brock University, St. Catharines, Ontario, Canada L2S 3A1. Consumer Insights and Product Innovation, Vineland Research and Innovation Center, 4890 Victoria Avenue North, Box 4000, Vineland Station, Ontario, Canada L0R 2E0" |
| ISSN/ISBN: | 1097-0010 (Electronic) 0022-5142 (Linking) |
| Abstract: | "BACKGROUND: Riesling icewine is an important product of the Ontario wine industry. The objective of this study was to characterize concentrations in aroma compounds in aged icewines associated with three harvest dates (H1, H2, H3) using stir bar sorptive extraction-gas chromatography-mass spectrometry and to make inferences, where appropriate, with respect to their roles in potential wine quality. RESULTS: Delaying harvest decreased concentrations of many odorants, but increased many critical odor-active compounds; e.g. 1-octen-3-ol, ethyl benzoate, ethyl octanoate, cis-rose oxide, and beta-ionone. H1 wines had higher concentrations of four aldehydes, three alcohols, nine esters, seven terpenes, gamma-nonalactone, p-vinylguaiacol, beta-damascenone, and 2-furanmethanol. However, many of these compounds, with some exceptions, have relatively high odor thresholds. Fourteen compounds were above their odor thresholds, including decanal, 1-octen-3-ol, phenylethyl alcohol, four ethyl esters, cis-rose oxide, linalool, gamma-nonalactone, p-vinylguaiacol, ethyl cinnamate, beta-damascenone, and 1,1,6-trimethyl-1,2-dihydronaphthalene. H3 wines contained higher concentrations of highly odor-active compounds, e.g. 1-octen-3-ol, cis-rose oxide, and beta-ionone. Only phenylethyl alcohol [H3 odor activity value (OAV) = 0.33 (honey, spice, rose)] and linalool [H3 OAV = 0.92 (floral, lavender)] had H3 OAVs < 1. CONCLUSIONS: Early harvest increased many esters and aliphatic compounds, but delayed harvest appeared to substantially increase concentrations of several highly odor-active compounds. (c) 2016 Society of Chemical Industry" |
| Keywords: | Biomarkers/analysis/metabolism *Crop Production Fermentation *Food Quality *Food Storage Fruit/*chemistry/growth & development/metabolism Gas Chromatography-Mass Spectrometry Monoterpenes/analysis/isolation & purification/metabolism Norisoprenoids/analysi; |
| Notes: | "MedlineKhairallah, Ramsey Reynolds, Andrew G Bowen, Amy J eng Comparative Study England 2016/02/03 J Sci Food Agric. 2016 Oct; 96(13):4398-409. doi: 10.1002/jsfa.7650. Epub 2016 Feb 26" |
