TY - GEN
T1 - Rheology of film-forming solutions prepared with modified banana starch and plasticizer
AU - Flores-Gómez, Yaritza
AU - Sánchez-Rivera, Mirna
AU - Romero-Bastida, Claudia
AU - González-Soto, Rosalía
AU - Bello-Pérez, Arturo
AU - Solorza-Feria, Javier
PY - 2008
Y1 - 2008
N2 - The physical properties of edible films depend to a great extent on those of their components; the biopolymer and the plasticizer, which define its physical changes during heat processing and handling. The aim of this work was to determine the rheological profile of film forming solutions (FFS) composed of native and modified (oxidized) banana starch and the plasticizer glycerol. Samples of FFS, composed by 4%(w/w) of native and oxidized banana starch and glycerol (4%(w/w) were prepared. Two types of rheological tests were undertaken using a strain controlled Rheometer TA Instruments, model AR1000, with a cone and plate system, 60 mm of diameter and angle of 2°: a) isothermal oscillatory (amplitude and frequency) tests at 25°C, 90°C and once cooled down, at 25°C. b) temperature sweeps, run as the samples were heated up from 25°C to 90°C and also when cooled down to 25°C. The isothermal tests showed that all pastes produced, behaved as weak viscoelastic gel-like materials, with the elastic modulus (G′)> the viscous modulus (G″) over the entire frequency range. The temperature sweeps also showed that all viscoelastic FFS, behaved as mainly elastic materials over the temperature range. Overall, FFS from native starch yielded gels with higher moduli values than those of the oxidized ones.
AB - The physical properties of edible films depend to a great extent on those of their components; the biopolymer and the plasticizer, which define its physical changes during heat processing and handling. The aim of this work was to determine the rheological profile of film forming solutions (FFS) composed of native and modified (oxidized) banana starch and the plasticizer glycerol. Samples of FFS, composed by 4%(w/w) of native and oxidized banana starch and glycerol (4%(w/w) were prepared. Two types of rheological tests were undertaken using a strain controlled Rheometer TA Instruments, model AR1000, with a cone and plate system, 60 mm of diameter and angle of 2°: a) isothermal oscillatory (amplitude and frequency) tests at 25°C, 90°C and once cooled down, at 25°C. b) temperature sweeps, run as the samples were heated up from 25°C to 90°C and also when cooled down to 25°C. The isothermal tests showed that all pastes produced, behaved as weak viscoelastic gel-like materials, with the elastic modulus (G′)> the viscous modulus (G″) over the entire frequency range. The temperature sweeps also showed that all viscoelastic FFS, behaved as mainly elastic materials over the temperature range. Overall, FFS from native starch yielded gels with higher moduli values than those of the oxidized ones.
UR - http://www.scopus.com/inward/record.url?scp=51149113275&partnerID=8YFLogxK
U2 - 10.1063/1.2964541
DO - 10.1063/1.2964541
M3 - Contribución a la conferencia
AN - SCOPUS:51149113275
SN - 9780735405493
T3 - AIP Conference Proceedings
SP - 1271
EP - 1273
BT - The XVth International Congress on Rheology - The Society of Rheology 80th Annual Meeting
T2 - 15th International Congress on Rheology
Y2 - 3 August 2008 through 8 August 2008
ER -