COSTA, Z. R. T.; http://lattes.cnpq.br/4072122711740244; COSTA, Zanelli Russeley Tenório.
Resumo:
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%).