Banca de DEFESA: GUSTAVO POSTINGHER

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : GUSTAVO POSTINGHER
DATE: 26/04/2024
TIME: 13:30
LOCAL: Audios 2
TITLE:

USE OF ION EXCHANGE RESIN IN RED WINES INTENDED FOR THE PRODUCTION OF SPARKLING ROSÉS BY ASSEMBLAGE

KEY WORDS:

Base wine; pH, oxidative stability, colour, shelf life. 

PAGES: 124
BIG AREA: Ciências Agrárias
AREA: Ciência e Tecnologia de Alimentos
SUBÁREA: Tecnologia de Alimentos
SPECIALTY: Tecnologia das Bebidas
SUMMARY:

In the last decade, sparkling wine production in Brazil has experienced a significant increase in both volume and quality, prompting wineries to seek technologies that lead to increasingly competitive products in the global market.) Among these technologies, the ion exchange and thermovinification processes stand out. The former process involves pH reduction through the decrease of cations, while the latter is characterized by heat application and the production of wines with high color intensity. The aim of this research was to assess the impact of ion exchange resin on a thermovinified red wine intended for the production of rosé sparkling wine by assemblage. For this purpose, a wine of the Alicante Bouschet variety, obtained through the flash-detent thermovinification process with an initial pH of 3.8, was subjected to cation exchange resin for oenological use. The treatments included samples with the control wine (pH 3.8) and with modified pH levels of 3.6, 3.4, 3.2, 3.0 and 2.0. Samples with reduced pH were analyzed for physicochemical parameters, phenolic compositon (IPT), colour and cation composition (K, Ca, Na, Zn, Fe, Mg, Mn, Cu and Na), to check the influence of the process on the wine. In a second experiment, the six treatments (pHs 3.8, 3.6, 3.4, 3.2, 3.0 and 2.0) were used to compose an assemblage with white wine, with the addition of 2% red wine, to make a rosé base wine for sparkling. The base rosé wines were monitored for CIELab and colour coordinates, with these parameters assessed every four months over twelve months. In a third experiment, four treatments (pH 3.8, 3.4, 3.0 and 2.0) were used to compose an assemblage with sparkling wines, with the addition of 2% red wine, for the production of rosé sparkling wines. Colourimetric analyses were carried out based on CIELab coordinates and chromatic analyses based on the lengths 420nm, 520nm and hue, as well as an oxidative stability test of the sparkling wines, evaluating these parameters bimonthly over six months. In the scenarios tested, the treatments with greater passage through the cationic resin, i.e. with lower pHs, resulted in wines and sparkling wines with greater oxidative stability, showing better colourimetric and chromatic indices over time. A reduction in IPT, anthocyanins and cation composition (K, Ca, Na, Zn, Fe, Mg, Mn and Na) was observed in red wine as pH decreased. The results obtained suggest that the combination of these two techniques can extend the shelf life of sensitive products such as rosé wines and sparkling wines, which have a short shelf life due in particular to oxidative changes in colour.

COMMITTEE MEMBERS:
Presidente - 1356958 - EVANDRO FICAGNA
Interna - 007.930.099-52 - CAROLINA PRETTO PANCERI - UFSC
Interno - 465.179.280-49 - VITOR MANFROI - UFRGS
Externo à Instituição - GIULIANO ELIAS PEREIRA - EMBRAPA
Externo à Instituição - BRUNO CISILOTTO - IFRS