Protein and Amino Acid Profiles of Different Whey Protein Supplements

Protein and Amino Acid Profiles of Different Whey Protein Supplements

Whey protein (WP) supplements have received increasing attention by consumers due to the high nutritional value of the proteins and amino acids they provide. However, some WP supplements may not contain the disclosed amounts of the ingredients listed on the label, compromising the nutritional qualit...

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Bibliographic Details
Published in:Journal of dietary supplements Vol. 13; no. 3; pp. 313 - 323
Main Authors: Almeida, Cristine C., Alvares, Thiago S., Costa, Marion P., Conte-Junior, Carlos A.
Format: Journal Article
Language:English
Published: England Informa Healthcare 03-05-2016
Subjects:
amino acids
Amino Acids - analysis
Amino Acids, Essential - analysis
Brazil
Commerce
Dietary Proteins - analysis
dietary supplement
Dietary Supplements - analysis
Drug Labeling
Humans
Lactalbumin - analysis
Lactoglobulins - analysis
United States
Whey - chemistry
Whey Proteins - analysis
α-lactalbumin
β-lactoglobulin
Brazil
United States
dietary supplement
α-lactalbumin
amino acids
β-lactoglobulin
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Summary:Whey protein (WP) supplements have received increasing attention by consumers due to the high nutritional value of the proteins and amino acids they provide. However, some WP supplements may not contain the disclosed amounts of the ingredients listed on the label, compromising the nutritional quality and the effectiveness of these supplements. The aim of this study was to evaluate and compare the contents of total protein (TP), α-lactalbumin (α-LA), β-lactoglobulin (β-LG), free essential amino acids (free EAA), and free branched-chain amino acids (free BCAA), amongst different WP supplements produced by U.S. and Brazilian companies. Twenty commercial brands of WP supplements were selected, ten manufactured in U.S. (WP-USA) and ten in Brazil (WP-BRA). The TP was analyzed using the Kjeldahl method, while α-LA, β-LG, free EAA, and free BCAA were analyzed using HPLC system. There were higher (p < 0.05) concentrations of TP, α-LA, β-LG, and free BCAA in WP-USA supplements, as compared to the WP-BRA supplements; however, there was no difference (p > 0.05) in the content of free EAA between WP-USA and WP-BRA. Amongst the 20 brands evaluated, four WP-USA and seven WP-BRA had lower (p < 0.05) values of TP than those specified on the label. In conclusion, the WP-USA supplements exhibited better nutritional quality, evaluated by TP, α-LA, β-LG, and free BCAA when compared to WP-BRA.
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ISSN:1939-0211
1939-022X
DOI:10.3109/19390211.2015.1036187