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11. Low-pressure conductive thin film drying of açaí pulp

Author

da Silva Simão, Raquel, Zhang, Lu, de Moraes, Jaqueline Oliveira, Schröder, Anja, Laurindo, João Borges, Schutyser, Maarten A.I., da Silva Simão, Raquel, Zhang, Lu, de Moraes, Jaqueline Oliveira, Schröder, Anja, Laurindo, João Borges, and Schutyser, Maarten A.I.

Abstract

Açaí has a high content of anthocyanins and unsaturated fatty acids, and drying parameters can affect the stability of these compounds. This study used a conductive thin-film dryer at a laboratory scale to mimic the (vacuum) drum drying of açaí pulp. The effect of drying chamber pressure on the drying kinetics and powdered product characteristics was investigated. Hot air drying and freeze-drying experiments were performed as references. A pilot-scale conductive dryer, namely a vacuum drum dryer, was used as well to dry açaí pulp. Conductive drying at low pressures led to lower boiling temperatures and shorter drying times but also more vigorous bubble formation. The anthocyanin content and antioxidant activity of contact-dried samples at low pressures were comparable to those of freeze-dried and significantly higher than those of hot air-dried. However, conductive drying caused greater lipid oxidation compared to freeze-drying and hot air drying. Oil loss was observed during vacuum drum drying except for the lowest pressure and the shortest drying time. Therefore, the results suggest that chamber pressure during conductive thin film drying should be carefully selected to obtain high-quality açaí powder.

Published
2022

19. Properties of starch-cellulose fiber films produced by tape casting coupled with infrared radiation.

Author

de Moraes, Jaqueline Oliveira and Laurindo, João Borges

Subjects
*TAPE casting, *INFRARED radiation, *BIODEGRADABLE materials, *CELLULOSE, *INFRARED drying equipment
Abstract

Tape casting is a suitable process for large-scale production of biodegradable films. This study presents a comparison of three drying procedures of starch-cellulose films: i) conduction drying, ii) infrared drying (42.3 W m−2, higher infrared heating power damaged the films), and iii) conduction-infrared drying. All the drying procedures were performed at approximately 60°C. Drying times from the second and third methods were close to 1 h, half the time observed for conduction drying. Films from the second and third methods showed similar hygroscopicity (0.15 g. g−1, RH 43%), tensile strength (31.3 MPa, RH 58%), and glass transition temperature (−12.13°C, RH 43%). [ABSTRACT FROM AUTHOR]

Published
2018
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