Resumen

MONTOYA GOMEZ, Álvaro; LONDONO GOMEZ, Jenny Katherine  y  MARQUEZ CARDOZO, Carlos Julio. BLACKBERRY LIQUOR (Rubus glaucus Benth) WITH DIFFERENT PULP PERCENTAGES. Rev. Fac. Nac. Agron. Medellín [online]. 2005, vol.58, n.2, pp.2963-2974. ISSN 0304-2847.

The blackberry (Rubus glaucus Benth) is a fruit of commercial interest that is highly perishable, showing appreciable damage due to fragileness and inadequate pos-harvesting handling. Large quantities of fruits are affected in their physical characteristics principally, with this product adequate for industrial processing. Twenty kg of blackberry were converted to pulp and homogenized and the pulp was characterized, encountering: grades of brix of 6,0; percent acidity of 2,91 % and density of 0,991 g/ml on average. Liquors were prepared with blackberry pulp in the following compositions: 25 %, 30 %, 35 %, 40 %, 45 %, 50 %, and 55 %, beginning with 35 °Brix for all cases in the fermentable must, adjusting the formulations with sucrose; the added yeast was Saccharomyces cerevisiae Meyen ex E.C. Hansen in a concentration of 0,2%; the fermentation was conducted in 2 liter capacity tanks with latex tube vents, the fermentable must remained in the tanks for 20 weeks, later the liquors were filtered and characterized chemically and physically, evaluating the alcohol percentage for distillation, documenting that the 40% blackberry pulp liquors produced the highest concentration of 8,36% of alcohol volume, on average. The statistical results showed a significant difference among the percent participation of pulp and its influence on the production of alcohol for levels of 25 % and 30 % with respect to levels of 35 %, 40 %, 45 %, 50 % and 55 %.  A mathematical lineal model appropriate for the production of alcohol as a function of the participation of pulp was obtained. The sensory test with 10 judges indicated that the liquor prepared with 35 % pulp was the most accepted.

Palabras clave : Liquor; blackberry; Rubus glaucus; pulp; alcohol.

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