The research involved two stages: In the first one, screening methodology was performed toevaluate the effect of the most significant factors: temperature, time and ratio raw material:solvent (MP: S) on the extraction of fructooligosaccharides (FOS) and reducing sugars (AR)from yacon flour. A factorial arrangement 2K were used; the levels for the factors were: time5-40 minutes; ratio MP: S 1:10-1:70 g / ml; temperature 30-90 ° C; responses variables wereextraction yield of FOS and AR. The results indicated that only the factor ratio MP: S hadsignificant effect on the extraction of FOS and AR (p-value <0.05). In the next stage, manylevels of ratio MP: S (1:10 to 1: 100 g / ml) were evaluated holding for time 5 minutes andtemperature at 30°C. Maximum extraction and greatest recovery of the extract was obtainedwith ratio MP:S 1:30. Finally, two kinetic models were used to describe the ...

Universidad Nacional Agraria La Molina. Escuela de Posgrado. Maestría en Tecnología de Alimentos

Universidad Nacional Agraria La Molina. Escuela de Posgrado. Doctorado en Ciencias e Ingeniería Biológicas

This research was developed in the Arapa lake, located in Puno, physicochemical parameters and a simplified mathematical model for the phosphorus were evaluated. Experimental design "BACI" (Before-After-Control-Impact) was used to assess the impact on water quality. During the "After-Impact" period, 70000 trouts were farmed every 3 months; then the food consumed and increased biomass was registered for each batch of trout farmed. In this period significant difference in acidity, carbon dioxide, phosphates and electrical conductivity was expressed. Total suspended solids showed a decrease. Alkalinity, pH and dissolved oxygen remained constant. Product of the digestion of food 611 kg of phosphorus were discharged into the Arapa lake; then the simplified mathematical model was established to determine the evolution of dissolved phosphorus versus time. From de 611 kg of phosphorus discharged...