首页|Influence of the wall material on the moisture sorption properties and conditions of stability of sesame oil hydrogel beads by ionic gelation
Influence of the wall material on the moisture sorption properties and conditions of stability of sesame oil hydrogel beads by ionic gelation
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
NSTL
Elsevier
Sesame oil was encapsulated by ionic gelation using matrices of sodium alginate and nopal mucilage as wall material. Moisture sorption isotherms of three different types of hydrogels beads formed by SA-NM (1:0 w/w), SA-NM (1:1 w/w) and SA-NM (1:1.5 w/w) were performed at 25, 35 and 45 degrees C. Experimental isotherms were described by means of the GAB model, showing sigmoidal shape. Pore radius values of beads ranged from 0.81 to 7.59 nm, corresponding to micropores and mesopores classification. The integral thermodynamic properties were estimated to define conditions of maximum stability of the hydrogel beads. The point of maximum stability, linked to minimum integral entropy, was in the range 3.31-5.59 kg H2O/100 kg d.s. (corresponding to water activity, alpha(W), of 0.23-0.59) in the studied temperature range. Enthalpy-entropy compensation for the beads exhibited the presence of two isokinetic temperatures; one at low moisture contents (0-5.95 kg H2O/100 kg d.s.) controlled by variations of the water entropy, and a second given by enthalpy-driven mechanisms. Overall, the results showed that the hydrogel beads exhibited features of micro- and meso-porous biomaterials. Besides, the composition of the wall material has central implications for the characteristics of the sorption process.
Sodium alginateNopal mucilageHydrogel beadsIonic gelationMinimum integral entropy
Velazquez-Gutierrez, S. K.、Alpizar-Reyes, E.、Guadarrama-Lezama, A. Y.、Baez-Gonzalez, J. G.、Alvarez-Ramirez, J.、Perez-Alonso, C.
展开 >
Univ Autonoma Estado Mexico, Fac Quim, Paseo Colon Esq Paseo Tollocan S-N, Toluca 50120, Estado De Mexic, Mexico
Univ Autonoma Nuevo Leon, Fac Ciencias Biol, Av Univ S-N, Monterrey 66455, Nuevo Leon, Mexico
Univ Autonoma Metropolitana Iztapalapa, Dept Ingn Proc & Hidraul, San Rafael Atlixco 186, Mexico City 09340, DF, Mexico
NSTL
Elsevier
