The clean technology concept aims to optimize juice extraction in order to obtain high yields, low losses and to manage the use of residues. The preparation of enzymes available nowadays containing depolimerizing activities like pectinases and celulases reach high yields of modified apple juice with less by-products. The main objective of this work was to establish the conditions for apple juice processing by enzymatic liquefaction and to evaluate the apple juice and residual pomace comparing them with that obtained by the traditional pressing extraction. The best conditions found include enzyme concentration of 0.1 mL.Kg-1 and 75 min of reaction at 50 °C. The yield of juice was 83.5% with around 16.5% of residual pomace, which represents 19% more when compared with the results found with traditional pressing processing. When obtained by enzyme liquefaction the juice was more acidic, with higher contents of minerals and of nitrogen than the pressed juice. In the apple pomace left by enzyme liquefaction, the values of acidity and ash of lipids and nitrogen compound were higher than in the pressed pomace but there are significant differences in food fibers although the pectin levels were significantly higher. No differences were found in the proportions of neutral sugars related to cellular walls. Enzyme liquefaction processing shows better results in the juice yield and residual pomace with an advantage of 18.5% over the pressing extraction.
liquefaction; apple
