Banca de QUALIFICAÇÃO: ISLAINE SANTOS SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : ISLAINE SANTOS SILVA
DATA : 05/03/2020
HORA: 08:00
LOCAL: UFBA
TÍTULO:

The use of different fining agents in different steps of winemaking and its impacts on the quality of white wines

PALAVRAS-CHAVES:

HPLC-DAD-FD, Vale do Submédio São Francisco, clarifiers, bioactive compounds, tropical wines.

PÁGINAS: 23
GRANDE ÁREA: Ciências Agrárias
ÁREA: Ciência e Tecnologia de Alimentos
SUBÁREA: Tecnologia de Alimentos
ESPECIALIDADE: Tecnologia das Bebidas
RESUMO:

The cultivar Chenin Blanc has demonstrated good adaptation to the edaphoclimatic conditions of the Vale do Submédio São Francisco and has been widely used in the production of white wines. To add quality to wines made from this cultivar, this work aimed to evaluate the effect of using bonding agents on their phenolic composition. Five treatments were tested: T₀ (without using glues), one using bentonite for debourbage (0.3 g L^-1) and stabilization (0.3 g L^-1), the third with bentonite for stabilization (0.5 g L ^-1), the fourth with PVPP (0.05 g L^-1) and bentonite (0.1 g L^-1) in alcoholic fermentation (AF) and bentonite (0.3 g L^-1) in stabilization and the fifth with gelatin (2 mL L^-1) and bentonite (0.1 g L^-1) in AF and bentonite (0.3 g L^-1) in stabilization. The parameters evaluated were: pH, total and volatile acidity, density, free and total sulfur dioxide, alcohol content, dry extract, phenolic compounds by HPLC, total phenolics by spectrophotometry and principal component analysis (PCA). It was evident that the use of different sizing agents did not cause a reduction in the concentration of total phenolics by spectrophotometry of white wines made with the cultivar Chenin Blanc. The results showed that the use of PVPP associated with bentonite increased the concentration of phenolic acids and that the bonding agents in general caused small reductions in stilbenes.

MEMBROS DA BANCA:
Presidente - 225.961.678-08 - ALINE CAMARÃO TELLES BIASOTO - EMBRAPA
Interno - 4725209 - CAROLINA OLIVEIRA DE SOUZA
Externo à Instituição - FÁBIO LANER LENK - IFSP