O.A.C., 2005); alcoholic content (ALC) (°GL) and density (DENS) (g cm−3) using pycnometer and analytical balance; (A.O.A.C., 2005) color index with the use of Millipore® filter and the spectrophotometer absorbance (Quimis Q798U) at 420, 520 and 620 nm (Amerine & Ough, 1986). The fixed acidity (FAC) was calculated from the difference click here between the total and volatile acidities (Brasil, 1986). The residual dry extract (REXT) was determined from the relationship REXT = EXT − (1 − SUL) − (1 − TSG), REXT being the residual dry extract; EXT the total dry extract; SUL the sulfate content
and TSG the total sugar content (Brasil, 1986). All the physicochemical results were obtained in triplicate. Thus six samples were collected for each type of wine, three find more measurements for each fermentation flask, in duplicate. The sensory assessment was carried out with the six red wines (TB, TI, PDB, PDI, SPB and SPI) as well as 2 commercial red wines: Bordô varietal wine (CB) and Bordô-Isabel assemblage wine (CI), both from the Serra Gaúcha, Southern Brazil, benchmark in wines. The commercial wines were used in the sensory acceptance analysis in order to know if the winemaking process employed in Brazilian wineries (traditional) and mainly the alternative/innovative
winemaking processes (pre-drying and static pomace) had great potential for consumer acceptance. The sensory assessment was carried out at the Sensory Analysis Laboratory of the Food Technology and Engineering Department of the São Paulo State University. A panel of 80 untrained consumers examined the acceptance for the attributes of appearance, aroma, body, and flavor and the overall acceptance, using a nine point verbal hedonic scale (1 = disliked extremely, 5 = neither liked nor disliked and 9 = liked extremely) (Meilgaard,
Civille, & Carr, 1999). The consumers carried out the sensory analyses in individual booths under white light with a room temperature from 23 to 25 °C over three days, the wines being presented in 30 mL transparent glass cups containing 15 mL of sample at 25 °C. An incomplete block experimental design was used (Meilgaard et al., 1999) and each panelist evaluated five of the eight wines. Methisazone The samples were presented in a monadic and randomized order, coded with random three-digit numbers. The ethical issues of the sensory analysis were approved by the Research Ethics Committee of the Institute of Biosciences, Humanities and Exact Sciences, São Paulo State University (process n. 0019.0.229.000-10). The results from the physicochemical and sensory analyses were evaluated using a one-way Analysis of Variance (ANOVA) with the Tukey multiple comparison test when significant differences were observed. Ward’s Hierarchical Cluster Analysis was applied to the chemometric approach.