2021
DOI: 10.1002/dta.3043
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Abstract: The stimulating and performance-enhancing properties of caffeine are often explored in one the most consumed types of supplements: the pre-workout supplements (PWS). However, despite the popularity of PWS, previous studies have reported incompatibilities between what is described in their labels and their actual caffeine content. This study aimed to develop, to optimize, and to validate a gaschromatography coupled to nitrogen-phosphorus detector (GC-NPD) method to quantify caffeine in PWS and to analyze commer… Show more

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Cited by 3 publications
(9 citation statements)
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References 55 publications
(131 reference statements)
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“…The findings of this study are generally more favorable than the results concerning caffeine quantification in nutritional supplements. For instance, in a similar study performed by our group, we quantified caffeine in preworkout supplements marketed in Brazil, and 54% ( N = 28) of the products presented inconsistencies 8 . Moreover, five supplements exceeded the recommended safe daily caffeine intake.…”
Section: Resultsmentioning
confidence: 90%
See 3 more Smart Citations
“…The findings of this study are generally more favorable than the results concerning caffeine quantification in nutritional supplements. For instance, in a similar study performed by our group, we quantified caffeine in preworkout supplements marketed in Brazil, and 54% ( N = 28) of the products presented inconsistencies 8 . Moreover, five supplements exceeded the recommended safe daily caffeine intake.…”
Section: Resultsmentioning
confidence: 90%
“…For instance, in a similar study performed by our group, we quantified caffeine in preworkout supplements marketed in Brazil, and 54% (N = 28) of the products presented inconsistencies. 8 Moreover, five supplements exceeded the recommended safe daily caffeine intake. Considering other related studies performed in Brazil, both Viana et al…”
Section: Resultsmentioning
confidence: 99%
See 2 more Smart Citations
“…This special issue concludes with the analysis of products sold as dietary supplements that are also familiar to drug chemists working in a forensic environment. Costa and colleagues present the analysis of samples advertised as caffeine‐containing pre‐workout supplements marketed in Brazil and reported that the information on the product label was by no means always accurate, which included the detection of caffeine not being listed on the label at all and some that exceeded recommended daily intake doses 23 . Finally, the contribution from Pawar et al from the US Food and Drug Administration presents the quantitative analysis of 58 collected products associated with thyroid management (via Internet between 2017 and 2018) using five hormones as reference material.…”
Section: Dietary Supplementsmentioning
confidence: 99%