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Determination of the Gnetum africanum water sorption isotherms for use in the design of an adapted dryer
Author(s) -
Edoun Marcel,
Kuitche Alexis,
Kapseu César
Publication year - 2010
Publication title -
international journal of food science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.831
H-Index - 96
eISSN - 1365-2621
pISSN - 0950-5423
DOI - 10.1111/j.1365-2621.2009.02109.x
Subject(s) - sorption , gravimetric analysis , water activity , desorption , chemistry , adsorption , chromatography , sugar , sorption isotherm , water content , analytical chemistry (journal) , food science , organic chemistry , geotechnical engineering , engineering
Summary This work is a contribution to the study of Gnetum africanum by the determination of sorption isotherms necessary for designing a dryer adapted to this product. Experiments were carried out on selected leaves sold in local markets of the region of Ngaoundéré (Cameroun) to produce a homogenous sample. Proximate characteristics of G. africanum leaves were determined. Desorption–adsorption isotherms were determined by using static gravimetric method at 30, 40 and 50 °C for water activity ranging from 0.10 to 0.90. Results obtained show that on dry basis G . africanum contains 5.91% of lipids, 20.19% proteins and 69.92% of total sugar and about 2.76% ash. The sorption isotherms of G. africanum are of type II. Five different models were used to study these experimental curves and GAB’S model best describes these sorption isotherms (MRE < 10% and R 2 > 0.996%). The sorption heat of the monolayer H M was 57.857 kJ mol −1 while that for the multilayer was 42.947 kJ mol −1 .