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http://repositoriodigital.ipn.mx/handle/123456789/10616| Título : | Study of Calcium Ion Diffusion in Components of Maize Kernels During Traditional Nixtamalization Process |
| Palabras clave : | diffusion calcim |
| Fecha de publicación : | 16-ene-2013 |
| Editorial : | J. L. Fernández-Muñoz |
| Descripción : | Our report shows the calcium ion diffusion process through the
different parts of maize kernels (pericarp, endosperm, and germ) during
the traditional nixtamalization process as a function of steeping time (t)
0–24 hr. The cooking step of the nixtamalization process used 3 kg of
maize kernels in 6L of water and 2% calcium hydroxide (w/w). The
cooking temperature was 92°C for 40 min. The calcium content of the
samples was measured using atomic absorption spectroscopy. We found
that the whole instant corn flour, pericarp, endosperm, and germ, had a
nonlinear relationship to steeping time, showing a local maximum at 9 hr.
Analysis of the different parts of the nixtamalized kernels showed that in
short steeping times (0–5 hr) calcium diffusion took place mainly in the
pericarp. Calcium diffusion in the endosperm and germ occurred
gradually over longer steeping times. However, the physical state of the kernels (broken kernels) accelerated the diffusion process. Calcium
diffusion occurred first in the pericarp, followed by the endosperm and
germ. Immediately after cooking (t = 0 hr), we found a 1.148% calcium
content in the pericarp, 0.007% in the germ, and 0.028% in the
endosperm. After 24 hr of steeping, the calcium contents were 2.714% in
the pericarp, 0.776% in the germ, and 0.181% in the endosperm. In
another study, the calcium content in the endosperm was measured by
first separating the 10% from the outermost, followed by another 10%
from the next endosperm tissue, and concluding with the remaining 80%.
Calcium ions were present mainly in the outermost layers of the endosperm.
The damaged kernels steeped for more than 5 hr showed greater
calcium concentrations than the undamaged counterparts. IPN |
| URI : | http://www.repositoriodigital.ipn.mx/handle/123456789/10616 |
| Otros identificadores : | 21 0009-0352 http://hdl.handle.net/123456789/91 |
| Aparece en las colecciones: | Doctorado |
Ficheros en este ítem:
| Fichero | Descripción | Tamaño | Formato | |
|---|---|---|---|---|
| 1119-07R Fernandez et al 2004.pdf | 102.79 kB | Adobe PDF | Visualizar/Abrir |
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