Comparação entre a metodologia oficial e uma metodologia alternativa para determinação de atividade ureática em farelo de soja

Abstract

Due to its high nutritional value, soy is the largest production grain in the world, a source of vegetable protein is the main ingredient used in animal feed, but in its in nature form it has antinutrients that impair the absorption of nutrients in monogastric animals, so it makes if necessary a rigorous thermal processing to eliminate these anti-nutritional factors and thus be useful for such application. The desolventizer and roaster (DT) is the equipment responsible for transforming the defatted soy mass (Lex) into soy meal, which is a by-product of soy oil production. To guarantee the quality of the meal with respect to antinutrients, the industry needs to carry out periodic analyses. This study aimed to evaluate the effectiveness of an alternative method in comparison with the official methodology in detecting the activity of the urease enzyme used as an indicator of the presence of antinutritional factors in soybean meal. Both methodologies were tested in triplicates on 40 samples, of which they contained 100% lex, 30% bran 70% lex, 50% bran and 50% lex, 70% bran 30% lex and 100% bran in a way that simulated the process DT and the reduction of antinutrients. The alternative method showed excellent efficiency compared to the official method, providing agility, low cost and economy, but it is limited because it does not quantify the urea activity and because it is an unofficial method, it cannot be used when there is a need to issue reports. However, it can be very useful for releasing bran loads upon receipt and for simple evaluation during bran production.