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Influence of high drying temperature on the beverage quality of coffee

In experiments carried out and later on submitted to the analysis in the Sensory Evaluation Laboratory, a new fact was noted: the panel members characterized the taste of some samples like "oil flavor". Analyzing those experiments that showed the same phenomenon, it was noted that the samples which were dried with high temperature and tasted after large storage periods were indeed classified as having a bad off-flavor similar to "oil flavor". Assuming that the association of the high temperature and large storage period produces this kind of flavor to the coffee beverage, a new experiment was designed whose aim was to prove it. Two lots of coffee samples were prepared; the pulped cherries and the unpulped ones, hoth dried at the same temperature of 100°C. (hot air temperature). After drying, the samples were stored under the same conditions as used for the previous experiments. The cup tests ware done in two ages (time): the first one in October 1961 (after three months storage) and no "oil flavor" was observed; the second age, in July 1962 (after twelve months storage) showed that all samples presented the so-called "oil flavor". Due to the economic advantage that the high temperature represents for drying coffee cherries, it is only recommended in case the product will be stored for short periods or if the final product will be industrialized at once.


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