Rheology and Gelation Temperature of Aqueous Gelatin and Sodium Alginate Solutions
2008; American Institute of Physics; Linguagem: Inglês
10.1063/1.2964785
ISSN1935-0465
AutoresVivian Florián-Algarín, Aldo Acevedo-Rullán, Albert Co, Gary L. Leal, Ralph H. Colby, A. Jeffrey Giacomin,
Tópico(s)Collagen: Extraction and Characterization
ResumoThe rheology and gelation of biodegradable polymers, such as gelatin and sodium alginate, are of particular interest in the processing of films in pharmaceutical industry. Constant‐stress temperature‐ramps were used to determine the gelation temperature (Tgel). The effect of operating parameters, such as stress and cooling rate, and formulation parameters, concentration and pH among other were studied. The steady‐state rheology above Tgel was experimentally determined over a wide range of concentrations and temperatures. Time‐Temperature superposition and concentration shifting were used to obtain master‐curves for the steady‐state viscosity. Simple phenomenological models were fitted to the master curves.
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