Investigation of sport supplements quality by Raman spectroscopy and principal component analysis |
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Institution: | 1. Chemistry Department – Institute of Exact Science (ICE), Federal University of Juiz de Fora (UFJF), Juiz de Fora, MG 36036-330, Brazil;2. Chemistry Department – Institute of Exact Science (ICEx), Federal University of Minas Gerais (UFMG), Belo Horizonte, MG 31270-901, Brazil;1. Instituto Federal de Educação, Ciência e Tecnologia do Sudeste de Minas Gerais, Campus São João Del Rei, São João Del Rei, MG, Brazil;2. Laboratório de Espectroscopia de Materiais, Dep. de Física, Universidade Federal de Juiz de Fora, Juiz de Fora, MG, Brazil;3. Laboratório de Tecnologia em Materiais Fotônicos e Optoeletrônicos, Faculdade de Tecnologia de São Paulo, CEETEPS/UNESP, 01124-060 São Paulo, SP, Brazil |
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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 1004 cm−1, while the spectral range between 1200 and 800 cm−1 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. |
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Keywords: | Sport supplements FT-Raman spectroscopy Principal component analysis |
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