Análises quali- e quantitativa de cafés comerciais via ressonância magnética nuclear

Leila Aley Tavares, Antonio Gilberto Ferreira
2006 Química Nova  
Recebido em 18/3/05; aceito em 4/11/05; publicado na web em 18/5/06 QUALI-AND QUANTITATIVE ANALYSIS OF COMMERCIAL COFFEE BY NMR. Coffee is one of the beverages most widely consumed in the world and the "cafezinho" is normally prepared from a blend of roasted powder of two species, Coffea arabica and Coffea canephora. Each one exhibits differences in their taste and in the chemical composition, especially in the caffeine percentage. There are several procedures proposed in the literature for
more » ... eine determination in different samples like soft drinks, coffee, medicines, etc but most of them need a sample workup which involves at least one step of purification. This work describes the quantitative analysis of caffeine using 1 H NMR and the identification of the major components in commercial coffee samples using 1D and 2D NMR techniques without any sample pre-treatment.
doi:10.1590/s0100-40422006000500005 fatcat:mvah5c6wlnabzcuvpic6srx5py