Effects of tetraethyl orthosilicate (TEOS) on the light and temperature stability of a pigment from Beta vulgaris and its potential food industry applications.
A novel, simple and inexpensive modification method using TEOS to increase the UV light, pH and temperature stability of a red-beet-pigment extracted from Beta vulgaris has been proposed. The effects on the molecular structure of betalains were studied by FTIR spectroscopy. The presence of betacyanin was verified by UV-Vis spectroscopy and its degradation in modified red-beet-pigment was evaluated and compared to the unmodified red-beet-pigment; performance improvements of 88.33%, 16.84% and 20.90% for UV light, pH and temperature stability were obtained, respectively,. Measurements of reducing sugars, phenol, and antioxidant contents were performed on unmodified and modified red-beet-pigment and losses of close to 21%, 54% and 36%, respectively, were found to be caused by the addition of TEOS. Polar diagrams of color by unmodified and modified red-beet-pigment in models of a beverage and of a yogurt were obtained and the color is preserved, although here is a small loss in the chromaticity parameter of the modified red-beet-pigment.
Licenciatura en Tecnología, Centro de Física Aplicada y Tecnología Avanzada (CFATA), Universidad Nacional Autónoma de México, Campus Juriquilla, Querétaro, Querétaro C.P. 76230, Mexico. gustavomolina21@gmail.com.
Gustavo A
GA
Molina
Centro de Investigación y de Estudios Avanzados del IPN, Unidad Querétaro, Apdo. Postal 1-798, Querétaro, Querétaro C.P. 76001, Mexico. angel.ramon.hernandez@gmail.com.
Angel Ramon
AR
Hernández-Martínez
Centro de Investigación en Física, Universidad de Sonora, Apdo. Postal 5-88, Hermosillo, Sonora C.P. 83190, Mexico. manuelcortez@live.com.
Manuel
M
Cortez-Valadez
Eisiaba, Instituto Tecnológico de Estudios Superiores Monterrey, Campus Querétaro, Querétaro C.P. 76130, Mexico. fergar17@prodigy.net.mx.
Fernando
F
García-Hernández
Centro de Física Aplicada y Tecnología Avanzada (CFATA), Universidad Nacional Autónoma de México, Campus Juriquilla, Querétaro, Querétaro C.P. 76130, Mexico. miries@fata.unam.mx.
Miriam
M
Estevez
D027461:Beta vulgaris / Q000737:chemistry*; D005519:Food Preservation; D006358:Hot Temperature; D008027:Light; D010860:Pigments, Biological / Q000737:chemistry*; D012821:Silanes / Q000737:chemistry*
D010860:Pigments, Biological; D012821:Silanes; C040733:tetraethoxysilane