Abstract The influence of ingredients and homogenization process parameters on the rheological properties of mayonnaise with pumpkin and rice oils added was investigated in this work. Various types of vegetable oils: sunflower, pumpkin and rice were used to make mayonnaise. The mechanical process of mayonnaise homogenization was carried out at room temperature. The preparation of mayonnaise was carried out on a laboratory model homogenizer with a rotor speed range of 3500-24000 rpm. Rheological measurements were carried out on a rotary viscometer with concentric cylinders at temperatures of 25 °C and 10 °C. The following rheological parameters were calculated from the data obtained: apparent viscosity, consistency index and flow index. The investigation results revealed that the main ingredients influenced the rheological properties of mayonnaise with pumpkin and rice oils added. Empirical flow curves were described by the Herschel-Bulkley model with a high degree of adequacy.

Abstract Determination of food products rheological properties is becoming more and more important for assessing raw materials and finished products quality, as well as for predicting a semi-finished product behavior during processing. The influence of honey variety, rotor speed and homogenization time on mayonnaise rheological properties were studied in this work. The following honey varieties were used: acacia, linden, forest, spring. Refined sunflower oil was used to make mayonnaise. The mechanical process of mayonnaise homogenization was carried out at a rotor speed of 10,000 rpm and 12,000 rpm, for 2 and 4 minutes at room temperature. Mayonnaise with 75% oil phase was prepared according to a traditional recipe without preservatives added. Rheological properties measurements were carried out on a rotary viscometer with concentric cylinders at a temperature of 25 °C. The following parameters were calculated according to the experimental data: apparent viscosity, consistency index and flow index. The research results showed that the type of honey influenced the rheological properties of mayonnaise. They changed as the homogenization process duration and the rotor speed increased. The tested samples of mayonnaise with honey added belong to non-Newtonian systems, a pseudoplastic type of liquid.

Abstract The main objective of the present study was to evaluate the variation of dependency between physical green coffee beans characteristics and thermal effects during roasting. In this work was analyzed coffee roasting process, used differential scanning colorimetry able to describe thermophysical processes inside a coffee bean during the roasting process was developed. For the analysis of thermophysical effects inside the coffee bean were explored six samples of coffee beans with different origins. The scanning colorimetry data obtained showed differences in thermal effects, the transition from an endothermic process to an exothermic one, as well as the amount of heat required for the roasting process. The analyzed humidity and density curves were then compared with the observed data. The analysis showed a direct dependency between the physical characteristics of the grain and the thermal effects during the roasting process. The present study concludes that green coffee with different properties requires the use of different strategies for the use of energy to obtain a quality product. developed origins one product