首页|Sorption properties of cambuci (Campomanesia phaea O. Berg) untreated and pre-treated with sorbitol as osmotic solute
Sorption properties of cambuci (Campomanesia phaea O. Berg) untreated and pre-treated with sorbitol as osmotic solute
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NSTL
Elsevier
Sorption isotherms of sorbitol osmotically pre-treated cambuci slices were obtained at (40, 50, and 60) degrees C using DDI (dynamic) method. The curves were classified as type III and the fruits showed hydrophobic behavior at water activities (a(w)) lower than 0.4. The pre-treatment with sorbitol as osmotic solute resulted in changes in the sorption behavior indicating that this solute acts as a humidifier due to the water-binding property. The equilibrium moisture content (X-eq) was determined at (20, 30, and 40) % of relative humidity (RH). The results showed that the RH, pre-treatment and temperature significantly affected the X-eq (p < 0.05). In general, X-eq decreased at lower RH showing that a higher driving force contributes to larger water removal. The experimental data were fitted to BET, GAB, and zeta models that showed a good fit. The isosteric heat of sorption (Delta H-s) was calculated and reinforced the water-binding property of sorbitol as, for the same X-eq, the Delta H-s obtained by cambuci pre-treated samples were greater than by control ones.
Moisture isothermsMathematical modelingTropical fruitHeat of sorptionEquilibrium moisture content
Paes, Mariana Schincariol、Pessoa Filho, Pedro de Alcantara、Tadini, Carmen Cecilia
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Univ Sao Paulo, Chem Engn Dept, Escola Politecn, Main Campus, BR-05508010 Sao Paulo, SP, Brazil
NSTL
Elsevier
