Studies on equilibrium moisture absorption of kappa carrageenan

Bajpai S. K., . and Pradeep T., . Studies on equilibrium moisture absorption of kappa carrageenan. pp. 2183-2191. ISSN 22317546

This study describes investigation of moisture sorption behavior of Carrageenan at 10 20 and 30oC under different relative humidity in the range of 23 to 96 percent using gravimetric method. The equilibrium moisture uptake data thus obtained were fitted to three well known three sorption isotherm models namely GAB Halsey and Oswin models using non-linear least square method. The well-known GAB model best interpreted the equilibrium data in a satisfactory manner. The monolayer moisture content Xm as determined from GAB model was found to be 31.72 x 10-3 43.60 x 10-3 and 17.41 x 10-3 kg kg-1 db at 10 20 and 30oC. The isosteric heat of sorption (qst) was determined using Clausius-Clapeyron type equation. The uptake data was also used to determine isokinetic temperature T (301.7 K) and harmonic mean temperature Thm (292.82 K). The enthalpy-entropy compensation theory indicated that moisture sorption process was enthalpy driven.

Full text available from: Official URL: http://ifrj.upm.edu.my/20%20(05)%202013/19%20IFRJ%...

Abstract

This study describes investigation of moisture sorption behavior of Carrageenan at 10 20 and 30oC under different relative humidity in the range of 23 to 96 percent using gravimetric method. The equilibrium moisture uptake data thus obtained were fitted to three well known three sorption isotherm models namely GAB Halsey and Oswin models using non-linear least square method. The well-known GAB model best interpreted the equilibrium data in a satisfactory manner. The monolayer moisture content Xm as determined from GAB model was found to be 31.72 x 10-3 43.60 x 10-3 and 17.41 x 10-3 kg kg-1 db at 10 20 and 30oC. The isosteric heat of sorption (qst) was determined using Clausius-Clapeyron type equation. The uptake data was also used to determine isokinetic temperature T (301.7 K) and harmonic mean temperature Thm (292.82 K). The enthalpy-entropy compensation theory indicated that moisture sorption process was enthalpy driven.

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Item Type:	Article
AGROVOC Term:	Equilibrium theory
AGROVOC Term:	Sorption
AGROVOC Term:	Carrageenans
AGROVOC Term:	Relative humidity
AGROVOC Term:	Gravimetric analysis
AGROVOC Term:	Moisture content
AGROVOC Term:	Temperature
AGROVOC Term:	Red algae
AGROVOC Term:	Polysaccharides
AGROVOC Term:	Water activity
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:26
URI:	http://webagris.upm.edu.my/id/eprint/21323

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