 IVES 9 IVES Conference Series 9 Chemical and colorimetric study of copigmentation between malvidin-3-O-glucoside and wine polyphenols and polysaccharides

Chemical and colorimetric study of copigmentation between malvidin-3-O-glucoside and wine polyphenols and polysaccharides

Abstract

AIM: The objective of this work was to perform a colorimetric study of the copigmentation between malvidin-3-O-glucoside, one of the main anthocyanins in red wines, and different wine phenolic compounds and polysaccharides. The present work also aimed to study the stabilization effect on the flavylium cation due to the copigmentation interactions with these compounds.

METHODS: Copigmentation was studied in model systems containing malvidin-3-O-glucoside and different copigments, including flavonols, flavanols, hydroxycinnamic and hydroxybenzoic acids and also polysaccharides at two pH values. The stability of the flavylium cation (25 ºC for 5 weeks) was assessed by HPLC-DAD in an acid medium whereas the study of copigmentation and its relevance on color was carried out at wine like pH (pH 3.6) by differential colorimetry using CIELAB parameters calculated from the whole visible spectra.

RESULTS: Important changes in the CIELAB parameters of the model systems were observed depending on the phenolic compound assayed as copigment, which could point out differences on the copigmentation interactions established. In the case of polysaccharides, it has been observed that they could play a role on the copigmentation effect. Moreover, copigmentation reactions seem to exert an influence on the flavylium cation stability by stabilizating the flavylium concentration during the length of the study or favoring the formation of anthocyanin-derived pigments.

CONCLUSIONS

Color changes and stability of the flavylium cation due to copigmentation phenomenon between anthocyanin and phenolic compounds and/or polysaccharides can be related to the copigment structure.

DOI:

Publication date: September 13, 2021

Issue: Macrowine 2021

Type: Article

Authors

Bárbara Torres-Rochera

Department of Analytical Chemistry, Nutrition and Food Sciences, Universidad de Salamanca, Salamanca, E37007, Spain. ,Ignacio GARCÍA-ESTÉVEZ, Department of Analytical Chemistry, Nutrition and Food Sciences, Universidad de Salamanca, Salamanca, E37007, Spain. María Teresa ESCRIBANO-BAILÓN, Department of Analytical Chemistry, Nutrition and Food Sciences, Universidad de Salamanca, Salamanca, E37007, Spain.

Contact the author

Keywords

anthocyanins, phenolic compounds, polysaccharides, copigmentation, wine stability

Citation

Thermal risk assessment for viticulture using monthly temperature data

Temperature extremes affect grapevine physiology, as well as grape quality and production. In most grape growing regions, frost or heat wave events are rare and as such conducting a risk analysis using robust statistics makes the use of long term daily data necessary.

Regulated deficit irrigation and crop load interaction effects on grape heterogeneity

Aim: To investigate the interaction effects between irrigation and crop load and the resulting impact on grape heterogeneity within a Geographical Indication in South Australia.

Methods and Results: Cabernet Sauvignon grapes were sampled at the time of harvest from the Coonawarra

PROBING GRAPEVINE-BOTRYTIS CINEREA INTERACTION THROUGH MASS SPECTROMETRY IMAGING

Plants in their natural environment are in continuous interaction with large numbers of potentially pathogenic and beneficial microorganisms. Depending on the microbe, plants have evolved a variety of resistance mechanisms that can be constitutively expressed or induced. Phytoalexins, which are biocidal compounds of low to medium molecular weight synthesized by and accumulated in plants as a response to stress, take part in this intricate defense system.1,2
One of the limitations of our knowledge of phytoalexins is the difficulty of analyzing their spatial responsiveness occurring during plant- pathogen interactions under natural conditions.

Soil proximal sensing provides direction in delineating plant water status of ‘crimson seedless’ (Vitis vinifera L.) vineyards

Crimson Seedless’ (Vitis vinifera L.) is a late-ripening, red seedless table grape cultivar with inadequate anthocyanin accumulation and less than ideal berry size issues

Oenological potential of cv. Tortojona: A minority grape variety from Extremadura, southwest Spain

This work, included in the VAVEGEX project, aims to evaluate the oenological, phenolic, chromatic and sensory characteristics of the grapes, must and wines produced from cv. Tortojona, minority variety grown in Extremadura region (Southwest, Spain).