Abstract
ABSTRACT Objective In this paper, we studied three different types of ordinary sports supplements containing whey protein: whey protein-based ones, hypercaloric ones, and protein bars. Methods A sample preparation procedure was studied employing microwave-assisted wet digestion in order to determine the Chromium and Manganese levels by graphite furnace atomic absorption spectrometry. Results The developed methods have presented good accuracy (recoveries in the range of 90% to 109%) and precision (Relative standard deviation <8%). Although an adequate detectability was obtained (50ng g-1 for Manganese and 65ng g-1 for Chromium), the sample preparation method was also adequate to inductively coupled plasma mass spectrometry analysis. The method was applied to 26 commercial samples, in which the Chromium concentrations were in the range between 0.22 and 1.0μg g-1 and the Manganese concentrations varied from 2.0 to 37μg g-1. Conclusion The results obtained by atomic absorption for both analytes were in agreement with those obtained by mass spectrometry. In addition, some samples presented concentrations of Chromium above the recommended daily intake and, as a result, we used the X-ray powder diffraction technique as an analytical tool to evaluate the oxidation state of Chromium in such samples.
Highlights
There is a current worldwide trend towards stereotyped beauty patterns and anti-aging solutions
The method was applied to 26 commercial samples, in which the Chromium concentrations were in the range between 0.22 and 1.0μg g-1 and the Manganese concentrations varied from 2.0 to 37μg g-1
The results obtained by atomic absorption for both analytes were in agreement with those obtained by mass spectrometry
Summary
There is a current worldwide trend towards stereotyped beauty patterns and anti-aging solutions. The search of these aesthetic benefits is a concern that affects all age groups, regardless of gender or social class. Sport supplements are indicated for patients with deprived diets and for athletes looking for improvements in physical performance [5]. These products are formulated based on macro and micronutrients in different proportions, making them suitable for different purposes [6]. We debate the supplements based on Whey Proteins (WP), which have high nutritional value, presenting high levels of essential amino acids, calcium, and bioactive peptides [7]
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