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Food Science and Technology (Campinas)

On-line version ISSN 1678-457X

Abstract

GUTKOSKI, Luiz Carlos et al. Effect of the maturation period of grains on the physical and rheological properties of wheat. Ciênc. Tecnol. Aliment. [online]. 2008, vol.28, n.4, pp. 888-894. ISSN 1678-457X.  http://dx.doi.org/10.1590/S0101-20612008000400019.

The aim of this study was to investigate the effect of the maturation period of grains on the physical and rheological properties of wheat flour analyzed by determining the hectoliter weight, weight of thousand grains, experimental milling, proteins, ashes, moisture, color, falling number, alveography, farinography, and damaged starch. Samples of genotypes BRS 179, Rubi, Fundacep 30, Fundacep 51, and 2006/2007 crop, were stored in Kraft paper bags with 10 kg of wheat, at environment temperature of 22 ºC and air humidity between 65-75%. Each treatment consisted of one genotype and the measurements were made at zero, 15, 30, 60, and 90 days of maturation. The experiment was carried out in fully randomized factorial design at 4 x 5. The results were analyzed by variance analysis (Anova) and the means compared by Tukey's test at 5% probability. With the increase in the maturation period of wheat, the flour presented the best physical and rheological properties assessed by the changes of the falling number, color, alveography, and farinography. The results of the enzymatic activity, luminosity, yellow intensity, and general gluten strength were effective in the evaluation of physical and rheological properties while the assessments of damaged starch and stability were not appropriate indicators. The wheat should not be sold after harvest, since its commercial classification improvement indicates a maturation period of 60 days. The genotypes of wheat BRS 179 and Fundacep 51 genotypes changed from bland to bread and from Rubi bread to improved indicating higher technological and commercial value with the increase in the maturation period of the wheat grains.

Keywords : post-harvest; alveography; farinography.

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