Análisis de Minerales y Metales Pesados en bebidas de café: Comparación de Chemex, Expresso Machine y Percolador con Técnicas Analíticas

Abstract

Abstract: Coffee is one of the most consumed beverages globally. Coffee generally contains important minerals and trace amounts of heavy metals, and their concentrations change depending on the brewing method. The purpose of this study was to evaluate and compare the magnesium (Mg), copper (Cu), and cadmium (Cd) content in coffee prepared using a Chemex, espresso machine, and percolator, using a commercial sample purchased from a supermarket. Samples were prepared in triplicate and analyzed in both liquid and solid phases. Microwave digestion with nitric acid was performed before instrumental analysis. Mg and Cu were determined by flame atomic absorption spectroscopy (FAAS), and Cd was determined by graphite furnace atomic absorption spectroscopy (GFAAS). The results were also compared using ANOVA and Tukey's test. The findings showed that the highest content of minerals and metals is found in the solid phase; their transfer to the beverage varies with the extraction technique, increasing for preparations at higher pressure and temperature.