MOISTURE SORPTION ISOTHERMS FOR KARINGDA (CITRULLUS LANATUS (THUMB) MANSF) SEED, KERNEL AND HULL

Abstract

Adsorption‐desorption behaviors of karingda (Citrullus lanatus (Thumb) Mansf) seed, kernel and hull for nine equilibrium relative humidities (ERH) ranging between 11 and 96% at temperatures of 10, 20, 30, 40 and 50C were studied following a static equilibriation technique using saturated solutions of various salts. Under both the adsorption and desorption processes, the equilibrium moisture contents (EMC) of the hull were found to be highest followed by those of the seed and the kernel at all the corresponding temperatures and ERH values. Analysis of these data using four sorption models (modified Henderson, modified Halsey, modified Chung‐Pfost and Guggenheim‐Anderson‐de Boer) and taking the temperature dependence of the respective coefficient into consideration, it revealed that both the Chung‐Pfost and the GAB models were acceptable in describing EMC‐ERH relationships for karingda seed, kernel and hull over the entire range of temperatures. The excess heat of sorption of all the samples, estimated from the Clausius‐Clapeyron equation, decreased exponentially with the increase in moisture content of the same.

Isosteric Heats of Water Vapor Sorption in Two Castor Varieties

“…Similar trends for many seeds have been reported in the literature [28,[38][39][40][41][42]. At low water activity values, the equilibrium moisture contents for both crop varieties were higher at low temperatures.…”

Analysis of moisture sorption characteristics of fish protein myosin

“…In modelling moisture sorption isotherms, linear regression analysis has been practiced by many workers (Bera et al. , 1990; Suthar & Das, 1997) to obtain the parameter values by fitting the data to the linearized form of the models. Toupin et al.…”

Moisture sorption isotherms of black gram nuggets (bori) at varied temperatures

“…It decreased from 5.94 to 2.52 and 8.42 to 3.42 kJ mol À1 for adsorption and desorption, respectively. These trends for adsorption and desorption are quite similar to many cereal grains, seeds (Chung & Pfost, 1967;Sopade & Ajisegiri, 1994;Suthar & Das, 1997). …”

“…M 0 , C and K were generalized in their temperature (T) dependence form as follows (Das & Das, 2002;Suthar & Das, 1997):…”

“…The equilibrium moisture contents for adsorption and desorption of the bori nuggets were determined at 25, 35, 45 and 55°C by static gravimetric technique based on isopiestic transfer of water vapour (Suthar & Das, 1997). Saturated salt solutions of various inorganic salts (LiCl, MgCl 2 , MgNO 3 , NaCl and KCl) were employed (Greenspan, 1977) to generate controlled humidity environment in a closed chamber ranging between 10% and 85% (5 levels).…”