TY - JOUR
T1 - Thermodynamic analysis for assessing the physical stability of core materials microencapsulated in taro starch spherical aggregates
AU - Hoyos-Leyva, Javier D.
AU - Bello-Pérez, Luis A.
AU - Agama-Acevedo, Edith
AU - Alvarez-Ramirez, J.
N1 - Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2018/10/1
Y1 - 2018/10/1
N2 - Taro starch has the ability of producing spherical aggregates under spray-drying without the addition of binding agents. This property makes taro starch suitable for microencapsulation of dietary compounds. This study addressed the physical stability of hydrophilic and hydrophobic core materials microencapsulated by spray-drying into taro starch spherical aggregates determined from a thermodynamic standpoint via vapor adsorption isotherms. Ascorbic acid and almond oil were used as compound models. Encapsulation efficiency, GAB sorption parameters, differential and integral thermodynamic properties, Gibb's free energy, entropy-enthalpy compensation, spreading pressure, effective diffusion rate, activation energy and critical water activity were determined. The encapsulation efficiency of ascorbic acid and almond oil was 99% and 56%, respectively. Monolayer moisture content was relatively low for ascorbic acid microcapsules. The adsorption process was driven by entropic mechanisms. The physical stability of taro starch spherical aggregates microcapsules with different core material was guaranteed for a range of water activities and temperatures.
AB - Taro starch has the ability of producing spherical aggregates under spray-drying without the addition of binding agents. This property makes taro starch suitable for microencapsulation of dietary compounds. This study addressed the physical stability of hydrophilic and hydrophobic core materials microencapsulated by spray-drying into taro starch spherical aggregates determined from a thermodynamic standpoint via vapor adsorption isotherms. Ascorbic acid and almond oil were used as compound models. Encapsulation efficiency, GAB sorption parameters, differential and integral thermodynamic properties, Gibb's free energy, entropy-enthalpy compensation, spreading pressure, effective diffusion rate, activation energy and critical water activity were determined. The encapsulation efficiency of ascorbic acid and almond oil was 99% and 56%, respectively. Monolayer moisture content was relatively low for ascorbic acid microcapsules. The adsorption process was driven by entropic mechanisms. The physical stability of taro starch spherical aggregates microcapsules with different core material was guaranteed for a range of water activities and temperatures.
KW - Hydrophilic and hydrophobic compounds
KW - Integral entropy
KW - Starch spherical aggregates
KW - Storage conditions
KW - Thermodynamic properties
UR - http://www.scopus.com/inward/record.url?scp=85048565595&partnerID=8YFLogxK
U2 - 10.1016/j.carbpol.2018.06.012
DO - 10.1016/j.carbpol.2018.06.012
M3 - Artículo
C2 - 30007632
SN - 0144-8617
VL - 197
SP - 431
EP - 441
JO - Carbohydrate Polymers
JF - Carbohydrate Polymers
ER -