FEITOSA, R. M.; http://lattes.cnpq.br/6333473185550085; FEITOSA, Regilane Marques.
Resumen:
Spray and foam drying of myrtle pulp. The myrtle is a fruit that stands out from the others by having significant amounts of anthocyanins. Because of its composition, the short shelf life and need to broadcast, this study aimed to dehydrate the pulp myrtle using spray drying and foam mat drying and
evaluate the powdered obtained. For spray drying formulation was elaborated from whole
pulp myrtle with addition of distilled water and 30% maltodextrin (DE-14) and dehydrated
in the drying temperatures of 150, 170 and 190 oC. For drying the foam mat drying to
select the best formulation, composed of pulp and additives myrtle (Emustab® and Super
Liga Neutra®), was based on analysis of over-run parameters, density and foam stability.
The selected foam was dried in an oven with forced air circulation at 50, 60, 70, 80 and 90
oC and different thicknesses (0,5, 1,0 and 1,5 cm). The myrtle pulp, selected formulations
and powders were characterized for physicochemical and physical parameters. The pulp
was also classified, as very acidic, with low fat percentile and relevant values of
anthocyanins. The elaborated formulations presented decreased tritalable total acidity and
moisture contents. The formulations of the spray drying and the foam mat drying is
presented themselves as pseudoplastic fluids with Mizrahi-Berk and Herschel-Bulkley
model showing the best settings, respectively. The Midili model, among the tested was that
better fitted curves of drying kinetics in the foam mat drying. Increasing drying
temperature the lowest values provided in powder samples of moisture content, water
activity, anthocyanins, and total color difference at the two types of drying. The acidity
and the insolubility of the powders showed better results for low temperatures. In a general
way, there were changes in the shape of powder particles to increase drying temperatures
and different types of samples. The model which best fit the experimental data of
adsorption isotherms at 25 oC, the powders was Peleg. The isotherms were classified as type II and III.