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Effect of process variables on the drying of guava pulp by cast-tape drying

Cichella Frabetti, Ana Caroline, Durigon, Angelise, Laurindo, João Borges
Lebensmittel-Wissenschaft + [i.e. und] Technologie 2018 v.96 pp. 620-626
drying, fiberglass, guavas, methodology, polyesters, powders, pulp, steam, temperature
Cast-tape drying (CTD) is a relatively new technique for dehydration and production of food powders. A solution or suspension is spread over a flexible support heated by water or steam. This study investigated the effect of flexible support type (polyester film – Mylar® or fiberglass coated with Teflon®) and pulp layer thickness (2 mm and 3 mm) on drying rate and temperature of guava pulp processed by CTD. All drying curves presented constant-rate period, which was 2.1 greater using 2 mm thick-pulp than 3 mm thick-pulp, for both Mylar® and Teflon®. Using same pulp thickness, similar drying rates and evaporative capacities were observed for both flexible supports. Guava pulp was less sticky on Teflon® than on Mylar® support and that is an advantage. Therefore, cast-tape drying can be used for production of guava powder with high drying rates and evaporative capacities.