TY - JOUR
T1 - Modification of the soy protein isolate surface at nanometric scale and its effect on physicochemical properties
AU - Acosta-Domínguez, Laura
AU - Hernández-Sánchez, Humberto
AU - Gutiérrez-López, Gustavo F.
AU - Alamilla-Beltrán, Liliana
AU - Azuara, Ebner
N1 - Publisher Copyright:
© 2015 Elsevier Ltd. All rights reserved.
PY - 2016/8/1
Y1 - 2016/8/1
N2 - The objective of this research was to modify at nanoscopic scale the surface of soy protein isolate (SPI) to improve its physicochemical properties. Nanostructured soy protein isolate (NSPI) was obtained by freezing SPI in liquid nitrogen and subsequent freeze drying. AFM images showed a rough surface for NSPI with valleys and cavities with diameters ranging from 8 to 15 nm. SPI presented a smooth surface and cavities with diameters in the order of 50-150 nm. According to the thermographic analysis, the homogeneous nanocavities formed on the surface by the nanostructuration process, allowed for an orderly arrangement of water molecules and hence a better heat distribution in the NSPI than in SPI. The spin-lattice relaxation times of adsorbed water molecules were lower in NSPI than in SPI at the whole water activity range. Gelling, water holding and oil absorption capacity were higher for NSPI than SPI, and both materials had similar emulsifying capacity.
AB - The objective of this research was to modify at nanoscopic scale the surface of soy protein isolate (SPI) to improve its physicochemical properties. Nanostructured soy protein isolate (NSPI) was obtained by freezing SPI in liquid nitrogen and subsequent freeze drying. AFM images showed a rough surface for NSPI with valleys and cavities with diameters ranging from 8 to 15 nm. SPI presented a smooth surface and cavities with diameters in the order of 50-150 nm. According to the thermographic analysis, the homogeneous nanocavities formed on the surface by the nanostructuration process, allowed for an orderly arrangement of water molecules and hence a better heat distribution in the NSPI than in SPI. The spin-lattice relaxation times of adsorbed water molecules were lower in NSPI than in SPI at the whole water activity range. Gelling, water holding and oil absorption capacity were higher for NSPI than SPI, and both materials had similar emulsifying capacity.
KW - Nanocavities
KW - Nanostructure
KW - Physicochemical properties
KW - Soy protein isolate
UR - http://www.scopus.com/inward/record.url?scp=84938634047&partnerID=8YFLogxK
U2 - 10.1016/j.jfoodeng.2015.07.031
DO - 10.1016/j.jfoodeng.2015.07.031
M3 - Artículo
SN - 0260-8774
VL - 168
SP - 105
EP - 112
JO - Journal of Food Engineering
JF - Journal of Food Engineering
ER -