Obtenção de pós de babosa por checagem em camada de espuma: caracterização e armazenamento.

Abstract

Obtaining aloe powder by foam layer checking: characterization and storage. Bioactive plants, such as babosa, have aroused interest in investigations aimed at studying their chemical and biochemical constituents, as well as the influence of conservatives’ processes on their properties. Thus, this work aimed the production of aloe powders by the drying method in foam layer, as well as the physical, chemical and physicochemical characterization and the evaluation of the stability of the powder selected during storage under controlled temperature conditions and relative humidity. Three formulations were elaborated with the aloe pulp combined with the albumin additives (0.5%) and xanthan gum (1%); albumin (0.5%) and carboxymethylcellulose (0.5%); and albumin (1%) and Maltodextrin (3%) To characterize them as to physical, chemical and physicochemical parameters, the drying in foam layer of the formulations was carried out in a greenhouse with forced air circulation, for a period between 280 and 700 minutes, at temperatures of 50, 60 and 70 °c. High moisture content and water activity and low levels of proteins, lipids, ashes and sugars were verified for the pulp of Aloe. It was found that the drying time decreased with the temperature increase and the mathematical models tested (Midilli, Page, diffusion approximation, Verna and logarithmic) can be used to estimate the drying kinetics curves in the foam layer of Formulations, with the best performance for the Midilli model. The additives and the drying process altered significantly the physical, chemical and physicochemical characteristics of the powders in relation to the whole pulp. The powder obtained from the formulation with 0.5% albumin and 0.5% carboxymethylcellulose, was distinguished by the content of vitamin C, total phenolic and antioxidant activity. It was found that for the selected powder (F2-70 °c) packed in laminated packaging that with the storage time there was an increase in moisture, water activity and reduction of the total phenolic content in the evaluated conditions of temperature (25 and 40 °c) and relative humidity ( 83%).