Abstract
The aim of this work was to experimentally determine drying curves for thin layer and bed drying of rosehip fruits, with and without pretreatments, to reduce processing times as a function of drying air operating variables, to propose dehydration kinetics of fruits and to determine its kinetic parameters for further use within drying simulation software. Fruits were pre-treated both chemically and mechanically, which included dipping the fruits in NaOH and ethyl oleate solutions; and cutting or perforating the fruit cuticle, respectively. Simulation models were then adopted to fit the kinetics drying data considering fruit volume shrinkage. These simple models minimized the calculation time during the simulation of deep-bed driers. Results show that pre-treatments reduced processing times up to 57%, and evaluated models satisfactorily predicted the drying of rosehip fruit. Effective mass diffusion coefficients were up to 4-fold greater when fruit was submitted to mechanical pretreatments.
Highlights
Scientific interest in rosehip fruit has exponentially increased recently due to its high content of vitamin C (Caro, Kesseler, & De Michelis, 2009; Pirone, Ochoa, Kesseler, & De Michelis, 2002, 2007; Mabellini et al, 2009; Ohaco, Pirone, Ochoa, Kesseler, & De Michelis, 2001), carotenoids
The aim of this work was to experimentally determine drying curves for thin layer and bed drying of rosehip fruits, with and without pretreatments, as a function of drying air operating variables and to experimentally determine rosehip fruits dehydration kinetics parameters for further use in a dryers simulation model
Published results show that the processing times for rosehip fruit, as well as cherries, plums and grapes, are excessively long, a phenomenon attributable to the moisture barrier created by a highly impermeable waxy outer cuticle (Doymaz, 2007; Márquez, 2003)
Summary
Scientific interest in rosehip fruit has exponentially increased recently due to its high content of vitamin C (Caro, Kesseler, & De Michelis, 2009; Pirone, Ochoa, Kesseler, & De Michelis, 2002, 2007; Mabellini et al, 2009; Ohaco, Pirone, Ochoa, Kesseler, & De Michelis, 2001), carotenoids (vitamin A precursors) This pseudo fruit is harvested between March and June. Opportunities include the high demand for the dried products on the international market (Márquez, 2003)
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