Sorption isotherms, thermodynamic properties and glass transition temperature of mucilage extracted from chia seeds (Salvia hispanica L.)

被引：84

作者：

Karina Velazquez-Gutierrez, Sandra ^{[1
]}

Figueira, Ana Cristina ^{[2
,3
]}

Eva Rodriguez-Huezo, Maria ^{[4
]}

Roman-Guerrero, Angelica ^{[5
]}

Carrillo-Navas, Hector ^{[6
]}

Perez-Alonso, Cesar ^{[1
]}

机构：

[1] Univ Autonoma Estado Mexico, Fac Quim, Dept Ingn Quim, Toluca 50120, Estado De Mexic, Mexico

[2] Univ Algarve, CIEO, P-8005139 Faro, Portugal

[3] Univ Algarve, Dept Engn Alimentar, P-8005139 Faro, Portugal

[4] Tecnol Estudios Super Ecatepec, Dept Ingn Quim & Bioquim, Ecatepec De Morelos 55210, Estado De Mexic, Mexico

[5] Univ Autonoma Metropolitana Iztapalapa, Dept Biotecnol, Mexico City 09340, DF, Mexico

[6] Univ Autonoma Metropolitana Iztapalapa, Dept Ingn Proc & Hidraul, Mexico City 09340, DF, Mexico

来源：

CARBOHYDRATE POLYMERS | 2015年 / 121卷

关键词：

Mucilage; Sorption isotherms; Thermodynamic properties; Minimum integral entropy; Enthalpy-entropy compensation; Glass transition temperature; MOISTURE SORPTION; WATER SORPTION; PHYSICOCHEMICAL PROPERTIES; ADSORPTION-ISOTHERMS; JUICE MICROCAPSULES; ENTROPY; MICROSTRUCTURE; EQUILIBRIUM; STABILITY; ENTHALPY;

D O I：

10.1016/j.carbpol.2014.11.068

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Freeze-dried chia mucilage adsorption isotherms were determined at 25,35 and 40 degrees C and fitted with the Guggenheim-Anderson-de Boer model. The integral thermodynamic properties (enthalpy and entropy) were estimated with the Clausius-Clapeyron equation. Pore radius of the mucilage, calculated with the Kelvin equation, varied from 0.87 to 6.44 nm in the temperature range studied. The point of maximum stability (minimum integral entropy) ranged between 7.56 and 7.63 kg H2O per 100 kg of dry solids (d.s.) (water activity of 0.34-0.53). Enthalpy-entropy compensation for the mucilage showed two isokinetic temperatures: (i) one occurring at low moisture contents (0-7.56 kg H2O per 100 kg d.s.), controlled by changes in water entropy; and (ii) another happening in the moisture interval of 7.56-24 kg H2O per 100 kg d.s. and was enthalpy driven. The glass transition temperature Tg of the mucilage fluctuated between 42.93 and 57.93 degrees C. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：411 / 419

页数：9

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