TY - JOUR
T1 - Effects of drying conditions on the rheological properties of reconstituted mucilage solutions (Opuntia ficus-indica)
AU - León-Martínez, F. M.
AU - Rodríguez-Ramírez, J.
AU - Medina-Torres, L. L.
AU - Méndez Lagunas, L. L.
AU - Bernad-Bernad, M. J.
PY - 2011/2/11
Y1 - 2011/2/11
N2 - The effects of spray drying conditions on reconstituted mucilage solutions were studied as a function of rheological properties (elastic and viscous properties) and particle size distribution (PSD). Rheological measurements were carried out at 25 °C and at concentrations of 1-6% (w/v) for spray dried and freeze dried samples. Experimental results showed that the shear viscosity slightly decreased with the increasing of inlet air temperature and atomization speed, and increased with the increasing of the feed flow rate. The Cross model was found to be the most appropriate to fit the flow curves of reconstituted mucilage solutions at concentrations ≥ 3% in spray dried samples; for freeze dried samples the Ostwald-de Waele model was better. The viscous modulus G″ predominated over the elastic modulus G′ for the spray dried samples, indicating a liquid-like material. The dynamic response and steady-shear measurements suggested a "random coil configuration". The majority of the powdered samples had a mean particle diameter > 100 μm with a multimodal particle size distribution (PSD).
AB - The effects of spray drying conditions on reconstituted mucilage solutions were studied as a function of rheological properties (elastic and viscous properties) and particle size distribution (PSD). Rheological measurements were carried out at 25 °C and at concentrations of 1-6% (w/v) for spray dried and freeze dried samples. Experimental results showed that the shear viscosity slightly decreased with the increasing of inlet air temperature and atomization speed, and increased with the increasing of the feed flow rate. The Cross model was found to be the most appropriate to fit the flow curves of reconstituted mucilage solutions at concentrations ≥ 3% in spray dried samples; for freeze dried samples the Ostwald-de Waele model was better. The viscous modulus G″ predominated over the elastic modulus G′ for the spray dried samples, indicating a liquid-like material. The dynamic response and steady-shear measurements suggested a "random coil configuration". The majority of the powdered samples had a mean particle diameter > 100 μm with a multimodal particle size distribution (PSD).
KW - Liquid-like material
KW - Mucilage
KW - Rheological properties
KW - Spray drying
UR - http://www.scopus.com/inward/record.url?scp=78951484716&partnerID=8YFLogxK
U2 - 10.1016/j.carbpol.2010.12.004
DO - 10.1016/j.carbpol.2010.12.004
M3 - Artículo
SN - 0144-8617
VL - 84
SP - 439
EP - 445
JO - Carbohydrate Polymers
JF - Carbohydrate Polymers
IS - 1
ER -