Reducing SO2 Doses in Red Wines by Using Grape Stem Extracts as Antioxidants

Abstract

SO2 is a very important wine preservative. However, there are several drawbacks associated with the use of SO2 in wine. The aim of this work is to evaluate the effect of the partial substitution of SO2 in the Tempranillo wine by a Mazuelo grape stem extract and by a commercial vine wood extract (Vinetan®). The results were compared with a control sample (with no addition of any extract). After 12 months of storage in a bottle, total anthocyanin content, together with total polyphenol and flavonoid content were slightly higher for control wines than for those treated with extracts. These differences were of little relevance, as no differences in antioxidant activity were found between any of the wines at the end of the study. The sensory analysis revealed that the use of both extracts as partial substitutes of SO2 could lead to wines with good organoleptic properties, similar or even better to the control ones.

Grape Stem Extracts with Potential Anticancer and Antioxidant Properties

“…For instance, in stem extracts from Portuguese grapes, kaempferol and isorhamnetin were identified [2], and in grape stems from Greek varieties, ferulic, coumaric, caffeic, and syringic acids were identified [28]. 3 83 ± 2 Total flavonoid content 4 2.6 ± 0.1 Antioxidant capacity by DPPH 5 0.47 ± 0.04…”

“…Therefore, it is important to find strategies that allow the reuse of these products. This residue is a rich source of phenolic compounds, celluloses, hemicelluloses, and lignins [ 1 , 2 , 3 , 4 , 5 , 6 ]. Among them, phenolic compounds confer antioxidant properties to the extracts obtained from grape stems.…”

“…However, the phenolic composition—and therefore the biological activity and efficacy—of a specific grape stem extract depends on the procedure used to obtain the extract. In a previous study, we selected an optimized extraction method for grape stems [ 3 ], and the extracts obtained by this method presented high antioxidant potential and were demonstrated to be good candidates for SO 2 substitution in wines [ 4 ]. With this background, the aim of the present research was to complete the characterization of those grape stem extracts by studying their potential for the treatment of human colorectal adenocarcinoma (Caco-2) and human breast adenocarcinoma (MCF-7 and MDA-MB-231) cell lines.…”

“…Expressed as quercetin-3-glucoside; 2 expressed as malvidin-3-glucoside;3 expressed as mg gallic acid/g extract;4 expressed as mg quercetin/g extract;5 expressed as mmol Trolox/g extract.…”

Biomolecules from Plant Residues

“…This work may open a promising pathway for the production of plant-based spray-dried powders for food applications as emulsion stabilizers. The work of Esparza et al [18] studied the effect of the partial substitution of SO 2 by a stem extract from Mazuelo grape and by a commercial extract of grapevine wood (Vinetan ® ) in Tempranillo wine. SO 2 is a very important preservative for wine and other foods, but it has several drawbacks mainly associated with various allergic reactions.…”