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Moisture Sorption Characteristics of Pineapple Processing Waste: Shell and Central Cylinder
Author(s) -
Viganó Juliane,
Gabas Ana Lúcia,
TelisRomero Javier
Publication year - 2014
Publication title -
journal of food process engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.507
H-Index - 45
eISSN - 1745-4530
pISSN - 0145-8876
DOI - 10.1111/jfpe.12064
Subject(s) - sorption , enthalpy , moisture , gravimetric analysis , thermodynamics , equilibrium moisture content , chemistry , water content , adsorption , materials science , organic chemistry , physics , geotechnical engineering , geology
The moisture adsorption isotherms of pineapple processing waste – shell and central cylinder – were determined at 40, 50, 60 and 70 C using a gravimetric method. The sorption data were fitted to six well‐known sorption isotherm models. The Guggenheim–Anderson–de Boer model was found to be the most satisfactory to represent the equilibrium moisture content data for the pineapple shells and central cylinders. The thermodynamic properties – differential enthalpy and entropy – were estimated by the C lausius– C lapeyron method. The differential enthalpy of the pineapple shells and central cylinders ranged between 11.486 to 1.671 kJ /mol and 23.655 to −0.945 kJ /mol, respectively. The differential entropy had minimum values at 0.04 and 0.005 kg water /kg dry solids for the pineapple shells and central cylinders, respectively. The pineapple shells presented two lines of compensation, one controlled by entropy and the other controlled by enthalpy and the pineapple central cylinders showed only one zone controlled by enthalpy mechanisms. Practical Applications This work presents information about the moisture sorption characteristics of pineapple processing waste. This kind of information is important for designing the unit operations necessary in the waste process use. In addition, knowledge of the moisture sorption characteristics is useful with respect to selection of packaging materials and storage stability. In general, this work gives relationship between water activity, entropy, enthalpy and moisture content of pineapple processing waste.