title: Simultaneous determination of (+)-catechin and (-)-epicatechin in cacao and its products by high-performance liquid chromatography with electrochemical detection.
abstract: A fast single-step extraction procedure and HPLC with electrochemical detection (ECD) in the oxidative mode has been used for the simultaneous, quantitative determination of (+)-catechin (CA) and (-)-epicatechin (EC) in cacao and its products. A UV detector measuring at 280 nm was also used in-line for comparison purposes. The samples were extracted with methanol and applied directly to the reversed-phase column of the HPLC. The high sensitivity of the ECD allowed operation at a low voltage (+0.5 V), but with a high sensitivity for the readily oxidizable CA and EC, thus reducing baseline noise. As a result, ECD had a better sensitivity and resolution than UV detection for the simultaneous quantitative determination of CA and EC in cacao and its products.
authors.affiliation: Laboratory of Food Chemistry, Graduate School of Agriculture and Biological Sciences, Osaka Prefecture University, Gakuencho 1-1, Sakai, Osaka 599-8531, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Subagio
authors.forename: P
authors.initials: P
authors.lastname: Sari
authors.forename: N
authors.initials: N
authors.lastname: Morita
mesh_terms: D002099:Cacao / Q000737:chemistry*; D002138:Calibration; D002392:Catechin / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004563:Electrochemistry / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D002392:Catechin