Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7690996 | Vibrational Spectroscopy | 2016 | 7 Pages |
Abstract
In this work, sport supplements were investigated by Raman spectroscopy. Samples were obtained from health foods shops, gyms and sports centers covering a wide range of available supplement powders. A systematic comparison of Raman spectra of the analyzed supplements allowed identifying the supplement type through the characteristic vibrational modes of carbohydrates and proteins. The protein supplements were identified by Raman bands at 1650, 1250 and 1004Â cmâ1, while the spectral range between 1200 and 800Â cmâ1 was useful to identify the carbohydrate supplements. Due to the diversity in composition of sport supplements, a chemometric tool such as principal component analysis (PCA) was employed to assist in the interpretation of Raman spectra, allowing also the identification of compounds present in sport supplements. Especially, the Raman scattering of aromatic and aliphatic amino acids residues contributes to the existence of bands characteristic for the different types of proteins. This kind of information is very important for the quality control of these products, for detecting the presence of fraud or a sample composition in disagreement with the label, thus ensuring the provenance of the supplements.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Mariana R. Almeida, LetÃcia P. de Souza, Rodrigo S. Cesar, Rafael A. Sousa, Celly M.S. Izumi,