TY - JOUR
T1 - Structure preservation of Aloe vera (barbadensis Miller) mucilage in a spray drying process
AU - Medina-Torres, L.
AU - Calderas, F.
AU - Minjares, R.
AU - Femenia, A.
AU - Sánchez-Olivares, G.
AU - Gónzalez-Laredo, F. R.
AU - Santiago-Adame, R.
AU - Ramirez-Nuñez, D. M.
AU - Rodríguez-Ramírez, J.
AU - Manero, O.
N1 - Publisher Copyright:
© 2015 Elsevier Ltd.
PY - 2016/3/1
Y1 - 2016/3/1
N2 - Aloe vera (barbadensis Miller) mucilage in powder form was obtained by spray-drying following by suspension in aqueous solution, to enable microstructure recovery. The rheological behavior of the reconstituted mucilage was evaluated as a function of mucilage concentration, temperature, pH and ionic-strength. Mucilage solutions exhibited shear-thinning non-Newtonian behavior. The viscosity was found dependent on ionic-strength. This dependence is more evident when divalent cations are used, although a strong rise in viscosity upon increasing pH is observed. Linear viscoelastic data show a predominant viscous behavior, but with a crossover point (storage module G' = loss module G″) suggesting a change in molecular conformation to a random-coil arrangement of the mucilage microstructure. The spray-dried powders were compared with fresh mucilage, with regard to chemical composition and mechanical flow behavior. Results reveal a small structure modification during the spray-drying process, evidencing preservation of the mucilage microstructure when optimum spray-drying conditions are used, i.e., 1.5 L/h inlet flow, temperature of 150 °C and atomization rate of 27,500 rpm.
AB - Aloe vera (barbadensis Miller) mucilage in powder form was obtained by spray-drying following by suspension in aqueous solution, to enable microstructure recovery. The rheological behavior of the reconstituted mucilage was evaluated as a function of mucilage concentration, temperature, pH and ionic-strength. Mucilage solutions exhibited shear-thinning non-Newtonian behavior. The viscosity was found dependent on ionic-strength. This dependence is more evident when divalent cations are used, although a strong rise in viscosity upon increasing pH is observed. Linear viscoelastic data show a predominant viscous behavior, but with a crossover point (storage module G' = loss module G″) suggesting a change in molecular conformation to a random-coil arrangement of the mucilage microstructure. The spray-dried powders were compared with fresh mucilage, with regard to chemical composition and mechanical flow behavior. Results reveal a small structure modification during the spray-drying process, evidencing preservation of the mucilage microstructure when optimum spray-drying conditions are used, i.e., 1.5 L/h inlet flow, temperature of 150 °C and atomization rate of 27,500 rpm.
KW - Molecular-weight
KW - Polysaccharides
KW - Rheology
KW - Viscoelastic properties
KW - Viscosity
UR - http://www.scopus.com/inward/record.url?scp=84950107822&partnerID=8YFLogxK
U2 - 10.1016/j.lwt.2015.10.023
DO - 10.1016/j.lwt.2015.10.023
M3 - Artículo
SN - 0023-6438
VL - 66
SP - 93
EP - 100
JO - LWT
JF - LWT
ER -