Determinação de proteínas totais em suplementos proteicos advindos do soro do leite.

Abstract

Athletes and physical activity practitioners associate consumption of protein supplements with physical activity to achieve better results faster. The commercialization of protein supplements has grown significantly in Brazil, due to the desire to obtain muscles and better performances in physical activities. In view of the variety of protein supplements on the market, the present work had as objective to evaluate the reliability of the protein content labeled by the total protein assay, using the Biutride method. Twelve samples of whey protein supplements from different manufacturers obtained by donation of consumers known as A to L. The results obtained show that samples A, K and L were non-compliant because they had a content of protein outside the allowed limits (± 20%). The results showed that 25% of the samples of whey protein were obtained from the data obtained from the biuret method, Presented results that reflect the lack of control of the whey protein producing industries, mainly the industries that present lack of commitment in the production of their supplements, where it can be seen that two products of the same brand presented different solubility quality, being the case of the supplement C (best result) and K, this one fails and solubility problems. In view of the need of users of protein products, the development of reliable methods for determination and quantification of total proteins in foods is essential to guarantee the quality and safety of marketed protein supplements.