PREBIOTIC FOOD ADDITIVE PRODUCT MADE OF BLACKBERRY AND RASPBERRY LEAVES AND PROCESS FOR PREPARING THE SAME

摘要

The invention relates to a food product and a process for preparing the same. According to the invention, the product comprises 60% concentrated natural extract of blackberry and raspberry leaves and 40% maltodextrins as an excipient for the extract incorporation and drying, having a content of soluble dietetic fibres of 46.5...49.8% and a content of solid substance of at least 90%. The process claimed by the invention consists of the concomitant hydroethanolic solvolysis of pectin polysaccharides, hemicelluloses and bioactive phenol aglycones of the blackberry and raspberry leaves previously washed, dried to a solid substance content of 90% and ground down to a size of 40 mesh, with food ethanol in a concentration of 45...50% v/v, while admixing 0.2...0.3% ascorbic acid for protecting the ethanol groups, at a temperature of 22...25°C, under percolation and pressure shocks condition, for 6 h, followed by extract separation by centrifugation for 15...20 min at 2500 rpm and pressing the remaining solid dispersion in a worm press, the resulting extract being used as such within some food supplements or being subjected to vacuum distillation at 45°C, being mixed with maltodextrins as powder, and the resulting mixture dried by atomization being incorporated as prebiotic additive in some powder food supplements.