TY - GEN
T1 - Optical properties of a heated corn-starch mixture
AU - Vazquez-Landaverde, Pedro A.
AU - Sánchez, Eduardo Morales
AU - Huerta-Ruelas, Jorge A.
PY - 2007
Y1 - 2007
N2 - In this study, the objective was to evaluate optical properties of a corn starch-water mixture as descriptors of its behavior under processing conditions. A solution of corn starch in water was prepared and heated from 25 to 85°C in a temperature-controlled optical cell. For the measurement of optical properties, a polarized laser beam modulated through a photoelastic modulator and an analyzer, was used as optical probe. It was possible to measure transmitted light, along with optical rotation. Optical measurements showed changes related to temperature dependent phenomena such as starch granule swelling and gelatinization, in the ranges 25 to 60°C, 60 to 85°C. Above 80°C transmission values were higher, due to the solution clarification caused by corn starch gelatinization. Regarding optical rotation, it was difficult to obtain reliable measurements at low temperatures due to the high turbidity of the system. However, once gel was formed at higher temperatures, optical rotation and light transmission increased. This study demonstrated that optical techniques are suitable for the study of the behavior of water-starch mixtures under processing conditions such as heating, revealing a promising future for the monitoring of such phenomena in the production line to lower costs and improve product quality.
AB - In this study, the objective was to evaluate optical properties of a corn starch-water mixture as descriptors of its behavior under processing conditions. A solution of corn starch in water was prepared and heated from 25 to 85°C in a temperature-controlled optical cell. For the measurement of optical properties, a polarized laser beam modulated through a photoelastic modulator and an analyzer, was used as optical probe. It was possible to measure transmitted light, along with optical rotation. Optical measurements showed changes related to temperature dependent phenomena such as starch granule swelling and gelatinization, in the ranges 25 to 60°C, 60 to 85°C. Above 80°C transmission values were higher, due to the solution clarification caused by corn starch gelatinization. Regarding optical rotation, it was difficult to obtain reliable measurements at low temperatures due to the high turbidity of the system. However, once gel was formed at higher temperatures, optical rotation and light transmission increased. This study demonstrated that optical techniques are suitable for the study of the behavior of water-starch mixtures under processing conditions such as heating, revealing a promising future for the monitoring of such phenomena in the production line to lower costs and improve product quality.
KW - Gelatinization
KW - Heat
KW - Optical rotation
KW - Starch
UR - http://www.scopus.com/inward/record.url?scp=37649025406&partnerID=8YFLogxK
U2 - 10.1117/12.742359
DO - 10.1117/12.742359
M3 - Contribución a la conferencia
AN - SCOPUS:37649025406
SN - 0819465321
SN - 9780819465320
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Sixth Symposium Optics in Industry
T2 - 6th Symposium Optics in Industry
Y2 - 8 March 2007 through 9 March 2007
ER -