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Drying Characteristics of Purslane (Portulaca oleraceae L.)

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  036068,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.14133) @2003
Authors:   M. KashaniNejad, L. G. Tabil, Bill Crerar
Keywords:   Color; Drying; Drying rate; Equilibrium moisture content; Modeling; Moisture content; Moisture Ratio; Purslane; Portulaca; Thin-layer drying

Thin layer drying rates of purslane were determined experimentally as a function of temperature. Thin layer drying data were obtained for purslane in four temperatures (35, 70, 95 and 120°C). Five empirical drying models (diffusion model, exponential model, Page model, two-term exponential and Thompson model) were fitted to the drying data. The color of purslane was determined after drying using spectro-colorimeter (Hunter Lab) in terms of Hunter L, a, and b values. The two term exponential and Page models were found to be most suitable in describing the drying characteristics of purslane. New parameters developed for the models resulted in a good fit at different temperatures. Color measurement indicated that greenness decreased with an increase in drying air temperature. Typical drying times were 88, 139, 416 and 1372 minutes at drying temperatures of 120, 95, 70 and 35°C respectively.