TY JOUR TI FTIR spectroscopy for quality evaluation of sports supplements on the Polish market KW Spectroscopy KW FTIR KW medium-infrared KW chemometric KW PCA KW PLS KW sports supplements KW whey KW creatine KW BCAA KW gainers KW pre-workouts JO Foods and Raw Materials AU Wójcicki, K.. PY 2020 IS 8 PB Кемеровский государственный университет