Modelling the Water Sorption Isotherms of Quinoa Seeds (Chenopodium quinoa Willd.) and Determination of Sorption Heats

被引:16
作者
Miranda, Margarita [1 ]
Vega-Galvez, Antonio [1 ,2 ]
Sanders, Mariela [1 ]
Lopez, Jessica [1 ]
Lemus-Mondaca, Roberto [1 ,3 ]
Martinez, Enrique [2 ]
Di Scala, Karina [4 ,5 ]
机构
[1] Univ La Serena, Dept Food Engn, La Serena, Chile
[2] Univ La Serena, CEAZA, La Serena, Chile
[3] Univ Santiago Chile, Dept Mech Engn, Santiago, Chile
[4] Univ Nacl Mar del Plata, Food Engn Res Grp, RA-7600 Mar Del Plata, Argentina
[5] Consejo Nacl Invest Cient & Tecn CONICET, Mar Del Plata, Argentina
关键词
Quinoa; Sorption isotherms; Isosteric sorption heat; Mathematical modelling; DESORPTION ISOTHERMS; ADSORPTION-ISOTHERMS; PROTEIN ISOLATE; ISOSTERIC HEAT; TEMPERATURE; QUALITY;
D O I
10.1007/s11947-011-0610-y
中图分类号
TS2 [食品工业];
学科分类号
0832 ;
摘要
Adsorption and desorption isotherms of quinoa seeds (Chenopodium quinoa Willd.) were measured using the static gravimetric method at three temperatures (20, 40 and 60 A degrees C). Water activity ranged from 0.118 to 0.937. The moisture sorption behaviour of quinoa was temperature dependent, as indicated by a decrease in equilibrium moisture content, at all levels of a (w), with increasing temperature. Eight mathematical equations available in the literature were used to model the experimental data, namely, GAB, BET, Caurie, Henderson, Oswin, Halsey, Smith and Iglesias-Chirife. All the equations showed generally a good fit; however, the Iglesias-Chirife and Oswin equations were considered the best to predict the experimental data for both isotherms. Effect of temperature on model parameters was analysed and studied through an Arrhenius-type equation. The net isosteric heats of desorption and adsorption were determined by applying the Clausius-Clapeyron equation resulting in 69.24 kJ mol(-1) for desorption and 61.26 kJ mol(-1) for adsorption. The experimental heat data were satisfactorily modelled by Tsami's equation.
引用
收藏
页码:1686 / 1693
页数:8
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