Identification and quantification of bioactive compounds in coffee brews by HPLC–DAD–MSn

Abstract

Coffee is a beverage widely consumed worldwide because of its organoleptic characteristics and stimulating and beneficial health effects. This paper presents the identification and quantification of chlorogenic acids and derivatives, trigonelline, nicotinic acid, 5-hydroxymethylfurfural, theobromine, theophylline, and caffeine in brews of 10 roasted ground coffee and 4 soluble coffee determined by HPLC–DAD–MSn. Among the chlorogenic acids and derivatives, 17 chlorogenic acids, 5 chlorogenic acid lactones, 2 cinnamoyl-amino acid conjugates, and 2 free cinnamic acids were identified. This is the first study that reports the presence of caffeoylferuloylquinic acid isomers, and cinnamoyl-amino acid conjugates in soluble coffee brews. Regular roasted ground coffee brews showed higher contents of chlorogenic acids (4162mg/100g), chlorogenic acid lactones (779mg/100g), p-coumaric acid (2.4mg/100g), trigonelline (2044mg/100g), nicotinic acid (100.4mg/100g), caffeine (4565mg/100g), and theobromine (12.5mg/100g) than regular soluble coffee brews. Decaffeinated coffee brews presented higher levels of chlorogenic acids, chlorogenic acid lactones, caffeic acid, and trigonelline when compared to the regular ones. Despite the differences in the levels of these compounds, brews of roasted ground coffee and soluble coffee, both regular and decaffeinated, represent an important source of bioactive compounds for habitual coffee consumers.