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https://hdl.handle.net/2440/138517
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Type: | Journal article |
Title: | Methoxypyrazine concentrations in the grape bunch rachis of Vitis vinifera L. Cv Shiraz: Influence of rootstock, region and light |
Author: | Sanders, R.D. Boss, P.K. Capone, D.L. Kidman, C.M. Maffei, S. Jeffery, D.W. |
Citation: | Food Chemistry, 2023; 408:135234-1-135234-10 |
Publisher: | Elsevier BV |
Issue Date: | 2023 |
ISSN: | 0308-8146 1873-7072 |
Statement of Responsibility: | Ross D. Sanders, Paul K. Boss, Dimitra L. Capone, Catherine M. Kidman, Sue Maffei, David W. Jeffery |
Abstract: | Vitis vinifera L. cv Shiraz appears unable to synthesise 3-alkyl-2-methoxypyrazines (MPs) in the berry, but can still produce significant concentrations in rachis. MPs are readily extracted from rachis during fermentation, producing Shiraz wines with uncharacteristic “green” flavours. Recently, rootstocks were shown to significantly alter MP concentrations in Cabernet Sauvignon rachis compared to own-rooted varieties, but whether Shiraz followed a similar trend required investigation. This study considered the effect of thirteen rootstocks on the concentrations of 3-isobutyl-2-methoxypyrazine (IBMP), 3-isopropyl-2-methoxypyrazine (IPMP), and 3-sec-butyl-2- methoxypyrazine (SBMP) in the rachis of Shiraz bunches sampled during multiple vintages across several Australian growing regions. Although IBMP was the most abundant, all measured MP concentrations were significantly affected by vintage, rootstock, and region. In addition, vine vigour showed positive correlations with IBMP, which were attributed to changes in canopy coverage impacting rachis light exposure. This hypothesis was explored with light exclusion trials, which significantly increased rachis IBMP concentrations. |
Keywords: | Wine aroma; Light exposure; Terroir; GC–MS; Stable isotope dilution assay; Green aroma; 3-isobutyl-2-methoxypyrazine |
Rights: | © 2022 Elsevier Ltd. All rights reserved. |
DOI: | 10.1016/j.foodchem.2022.135234 |
Grant ID: | http://purl.org/au-research/grants/arc/IC170100008 |
Published version: | http://dx.doi.org/10.1016/j.foodchem.2022.135234 |
Appears in Collections: | Agriculture, Food and Wine publications |
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