Foi estudado o comportamento de diversos agentes clarificadores na cologem de vinhos brancos procedentes de variedades de uvas diversas, de três regiões vinícolas diferentes dos Estados de São Paulo e de Minas Gerais. Observou-se que tais agentes comportaram-se de maneira diferente de acôrdo com o vinho a ser clarificado. Para os vinhos brancos testados, verificou-se que a bentonita foi o melhor clarificodor. As observações concordam com resultados obtidos por outros pesquisadores para diferentes vinhos.

A laboratory trial was carried out to determine the behavior of different fining agents in samples of white wine obtained from various grape varieties. These tested wines were produced in two regions of the State of São Paulo and one of Minas Gerais. It was observed that these fining agents behaved differently according to the type of wine to be cleared. In our experimental trials bentonita was the best fining agent. These observations agree with those obtoined by others authors in other parts of the world. As a general procedure it is advisable to conduct small-scale fining tests in the laboratory before attempting to clarify the bulk volume of wine in the winery, to determine the efficiency of the fining agent, its effect on the wine, and the quantity necessary to clarify.

Em 1958 e 1959 foram estudados no Vale do Paraíba, região normalmente produtora de café de bebida rio ou riada, processos de colheita e preparo a fim de observar a influência dessas operações sôbre a qualidade da bebida. Dois processos de colheita foram comparados: o da derriça e o da colheita apenas dos frutos maduros ou cerejas. Estas foram sêcas com e sem prévio despolpamento, retirando-se a mucilagem pela fermentação natural ou com solução de NaOH a 0,5%, sendo, neste último caso, maceradas, ou não, em água, durante 12 horas. Em todos os casos a secagem foi feita em terreiro. Para comparação, incluiram-se na experiência quatro lotes de café das bebidas-padrão: mole, apenas mole, dura e riada. O café derriçado alcançou as piores médias, classificando-se em ambos os anos, entre os padrões de bebida dura e riada. As cerejas despolpadas não diferiram estatisticamente entre si e tampouco do padrão mole. As cerejas não despolpadas se mostraram equivalentes ao padrão mole, em 1958, mas foram inferiores a êle em 1959.

The influence of harvesting and processing the coffee fruits on the qualities of the beverage was studied on material obtained from the Paraiba Valley. This region is known to produce low quality coffee, commonly designated as having the Rio flavor. Two haver sting procedures were compared: (I) the usual stripping method and (2) the hand picking of ripe berries. The coffee fruits picked according to the second method were further thus treated: (a) dried as such; (b) pulped and then dried. The mucillage of the pulped coffee was removed by natural fermentation or by treatment in a 0.5% sodium hydroxide solution. After washing the pulped coffee seeds that underwent this last treatment were immediately put to dry in one case and macerated during 12 hours before being dried in the other. All samples in the experiment were sun dried. For statistical analysis, the samples obtained in the experiment were compared in the cup test with four standard samples corresponding to the soft, softish, hard, and slightly Rio flavor beverages. The poorest samples were represented by the stripped coffee. They gave a beverage that was classified between hard and slightly Rio. All the samples of pulped coffee were statistically alike and similar to the soft standard. The berries that were dried without pulping were comparable to the soft standard in 1958, but were inferior to it in 1959.

Foram ensaiados três tratamentos na vinificação do mosto de uva, a saber; a) fermentação natural: b) fermentação com o emprêgo da estirpe de fermento I.A. 78, e c) fermentação com associação de leveduras. Os dados obtidos mostraram que a estirpe I.A. 78 apresentou os melhores resultados na redução da acidez volátil dos vinhos obtidos.

Three different fermentation techniques were compared to determine their influence on the volatile acidity of the wine. They were as follows; a) natural fermentation: b) with the selected wine yeast strain I.A.-78, and c) with a mixture of yeasts. The results of these experiments, with six replications, pointed out that the fermentation with the wine yeast strain I.A.-78 gave wines with lower volatile acidity, a desirable characteristic of the good wines.

Foram realizados ensaios de vinificação, para observar a influência da associação de variedades de uvas cultivadas no Estado de São Paulo, sôbre a melhoria da qualidade do vinho. As uvas empregadas no ensaio foram das variedades Seibel 2 e Seibel 10096. A mistura dos mostos constituída de 70% da var. Seibel 10096 e 30% da var. Seibel 2 foi a que apresentou melhores resultados.

The musts of two grape varieties (Seibel 2 and Seibel 10.096) raised in the State of S. Paulo were blended in different percentages to observe their influence on the wine quality. The variety Seibel 2 produces wines of very poor quality. A must composed of 50% Seibel 2 and 50% Seibel 10.096 produced a much better wine. The most remarkable improvement was obtained through the fermentation of a must composed of 70% Seibel 10.096 and 30% Seibel 2.

Ensaios foram realizados para estudar o comportamento de 25 leveduras na fermentação vinária, com o objetivo de selecionar aquelas que pudessem influir na obtenção de vinhos com grau alcoólico satisfatório e teores de ácidos voláteis e aldeído acético baixos. Os resultados obtidos mostraram que as leveduras n. 13, 14, 16, 25, 20, 15, 4, 3, 2 e 17 atingiram essa finalidade, podendo servir como ponto de partida para novas observações nas cantinas industriais

Experiments were carried out on laboratory scale to observe the behaviour of different strains of Saccharomyces on the wine constituents. The strains of yeasts were isolated from fermented juice of various varieties of grapes raised in three different regions of Brazil. The statistical analyses of the results showed that some of the strains behaved quite differently as far as volatile acids are concerned. Some of them produce wines, with low volatile acidity looking promising to be used successfully in industrial scale as a practice to improve wine quality and acceptance.