Effect of Two Anti-Fungal Treatments (Metrafenone and Boscalid Plus Kresoxim-methyl) Applied to Vines on the Color and Phenol Profile of Different Red Wines

Abstract

Abstract:The effect of two anti-fungal treatments (metrafenone and boscalid + kresoxim-methyl) on the color and phenolic profile of Tempranillo and Graciano red wines has been studied. To evaluate possible modifications in color and phenolic composition of wines, control and wines elaborated with treated grapes under good agricultural practices were analyzed. Color was assessed by Glories and CIELab parameters. Color changes were observed for treated wines with boscalid + kresoxim-methyl, leading to the production of wines with less color vividness. Phenolic profile was characterized by HPLC analysis. Boscalid + kresoxim-methyl treatment promoted the greatest decrease on the phenolic content in wines.

The measure and control of effects of botryticides on phenolic profile and color quality of red wines

“…Spain). The color and phenolic profile of wines obtained from both varieties and the differences between them were established in a previous study (Briz-Cid et al, 2014). Thereby, T wines have a higher content of proanthocyanidins, flavonols and phenolic acids than G wines but, on the contrary, G wines have a greater concentration in flavan-3-ol monomers and total anthocyanins (although the content of monomeric anthocyanins was similar in both cases).…”

“…Procedures used for the extraction of anthocyanins, phenolic acids, resveratrol, flavonols, flavan-3-ol monomers and proanthocyanidins were described in detail by Briz-Cid et al (2014). After extraction these groups of polyphenols were identified and quantified by HPLC/DAD-ESI/MS (Briz-Cid et al, 2014).…”

“…The characterization of the color fraction was determined by spectrophotometric parameters, colorimetric indexes (Glories, 1984) and CIELab parameters (OIV, 2000), using a Beckman Coulter DU 730 Life Science UV/Vis spectrophotometer according to the protocols described in a previous paper (Briz-Cid et al, 2014). All of the measurements were carried out by duplicate and using quartz cells of 1 mm path length.…”

“…After extraction these groups of polyphenols were identified and quantified by HPLC/DAD-ESI/MS (Briz-Cid et al, 2014). HPLC measurements were made by using a Thermo Separation-Products (TSP, Waltham, MA, USA) system comprised of a P2000 binary pump equipped with a TSP AS1000 autosampler, and a TSP SCM1000 vacuum membrane degasser.…”

“…Recently, the effect of new fungicides (metrafenone, boscalid and kresoximmethyl) applied under good agricultural practices (GAP), on the phenolic compounds responsible for the color, astringency and bitterness of Tempranillo and Graciano red wines has been studied (Briz-Cid, Figueiredo-Gonz alez, Rial-Otero, Cancho-Grande, & Simal-G andara, 2014). Significant reductions in the phenolic content were found in wines obtained from red grapes treated with boscalid and kresoxim-methyl under GAP; monomeric anthocyanins being the most affected compounds (Briz-Cid et al, 2014).…”