Sangue bovino em pó: análise física

Abstract

Bovine blood is a colloidal solution, consisting of several proteins, enzymes, minerals, lipids, cells, glucose and vitamins, it is widely used in other countries with human food in order to enrich the food. The amount of blood generated in Brazil is very high and the use for food insignificant, with most of it being disposed of in the environment. To facilitate storage and to prevent the proliferation of microorganisms this liquid blood can be transformed into a powder and through foam-layer drying. The objective of the work was to make physical analyzes of the powder and obtain the adsorption isotherms of the bovine blood powder. The activity of water, moisture, ash content, lipids and solubility of the powder were analyzed. The isotherm was done at temperatures of 15 ° C, 25 ° C and 35 ° C with the powder obtained under the experimental conditions of the minimum factorial, maximum factorial, center point of an experimental design and the powder of the blood obtained by lyophilization. The adjustments were made by the Oswin model with the help of Statistica 7.0 software. The results of the dust characterization were satisfactory for both the foam-mat drying powders and the dry powder by lyophilization; for water activity, the highest measured value was 0.199. The adsorption isotherms curves obtained were Type II, or Sigmoidal. The adjustments were all satisfactory and statistically significant with R2 values between 0.8 and 0.9 in a 95% confidence interval. The curves of the adsorption isotherms presented practically the same behavior.