TO THE QUESTION OF THE GRAIN BRAN MINERAL COMPOSITION EVALUATION

doi: 10.25712/ASTU.2072-8921.2021.02.004

Abstract

 In accordance with their biochemical composition, grain bran is widely used in the feed production and as a food supplement with a high content of valuable nutrients. New unconventional directions for using grain bran will expand the range of obtained products. The purpose of this work was to assess the prospects for the use of grain bran as an additional component in fermentation technologies based on their mineral composition study. The objectives of the study were to identify the dependences of the individual cations content on the bran type and its granulometric composition, as well as in determining the degree of their transition to water-soluble fractions. 19 samples of grain bran obtained from enterprises of the Russian Federation and specially prepared water fractions were used as objects of research. A relationship was revealed between the granulometric composition of the bran and the ash content in them, regardless of the initial biochemical composition of wheat and other grain crops types (rye, triticale). It has been established that potassium is present in the highest concentrations in all types of bran, the concentration of calcium in bran is extremely insignificant. It was found that the concentration of phosphorus in rye bran samples is on average 1.5-2 times higher than in wheat bran. It has been shown that the type of bran affects the transition of phosphorus to a soluble state. The average value of the fraction of the phosphorus transition to the liquid phase was for bran from wheat, triticale and rye, respectively, 26.3 %, 23.7 % and 17.6 %. The revealed dependence is associated with an increased content of phytin in rye bran. When using grain bran in fermentation technologies, it is recommended to preliminarily carry out their water-thermal and enzymatic treatment in the presence of microbial phytases, which will maximize the conversion of raw phytin into soluble phosphorus forms.