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  • Effects of antioxidant and elemental sulfur additions at crushing on aroma profiles of Pinot Gris, Chardonnay and Sauvignon Blanc wines.

Effects of antioxidant and elemental sulfur additions at crushing on aroma profiles of Pinot Gris, Chardonnay and Sauvignon Blanc wines.

Food chemistry (2021-01-09)
Xiaotong Lyu, Leandro Dias Araujo, Siew-Young Quek, Paul A Kilmartin
RESUMO

The antioxidants sulfur dioxide (50 ppm) and ascorbic acid (100 ppm) were added to grapes soon after harvest at crushing. The chemical composition and sensory profile of Sauvignon Blanc, Pinot Gris and Chardonnay wines were examined, made from grapes collected at three different sites for each variety. With good antioxidant protection of the juices, reflected in low absorbances at 420 nm, remarkable increases in the polyfunctional mercaptans, 3-mercaptohexanol (3MH) and its acetate ester (3MHA), were seen in the wines. Moreover, high levels of these compounds were produced in the Pinot Gris and Chardonnay wines, equally high as with Sauvignon Blanc. The Pinot Gris wines maintained varietal characteristics in sensory profiles, even with high levels of polyfunctional mercaptans. When elemental sulfur was included with the grapes at crushing, extra increases in polyfunctional mercaptans were observed. However, this led to the production of unwanted reductive aroma compounds in some wines.

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Sigma-Aldrich
Magnesium sulfate heptahydrate, ACS reagent, ≥98%
Sigma-Aldrich
Hexanal, 98%
Rutin, phyproof® Reference Substance
Sigma-Aldrich
trans-2-Hexen-1-al, 98%
Sigma-Aldrich
trans-2-Hexen-1-ol, 96%
Sigma-Aldrich
1-Hexanol, ReagentPlus®, ≥99.5% (GC)
Sigma-Aldrich
3-Mercaptohexyl acetate, ≥98%, FG
Sigma-Aldrich
cis-2-Hexen-1-ol, 95%
Supelco
SPME fiber assembly Divinylbenzene/Carboxen/Polydimethylsiloxane (DVB/CAR/PDMS), needle size 23 ga, StableFlex, for use with manual holder/autosampler, fiber L 2 cm