Urpi-Sarda M., Monagas M., Khan N., Llorach R., Lamuela-Raventos R.M., Jauregui O., Estruch R., Izquierdo-Pulido M., Andres-Lacueva C. (2009) Targeted metabolic profiling of phenolics in urine and plasma after regular consumption of cocoa by liquid chromatography-tandem mass spectrometry. J Chromatogr A 1216:7258-67

Compound Mean content
(+)-Catechin 0.26 mg/g
(-)-Epicatechin 1.15 mg/g
Procyanidin dimer B2 0.91 mg/g
Vanillin 0.94 mg/g
Quercetin 3-O-glucoside 0.05 mg/g
Quercetin 0.005 mg/g
Quercetin 3-O-arabinoside 0.02 mg/g
Quercetin 3-O-glucuronide 0.003 mg/g
Polyphenols, total 12.38 mg/g