Heavy metals Complexation Grape juice Catechin Stripping voltammetry
Salinas Í, Esparza I, Gómez S, Santamaría C, Fernández J. A Study of Heavy Metal Complexation in Grape Juice. Electroanalysis 2005;17(5-6):469-475.
Differential pulse anodic stripping voltammetry, DPASV, has been used to monitor the initial stages of grape juice
fermentation, focusing on Zn interactions with natural occurring ligands. Langmuir and Scatchard linearization
methods have been employed. A 1:1 ratio has been found by either method; from Langmuir data analysis only one
ligand population was found, while Scatchard approach gave rise to the detection of two ligand types. Both data
analysis procedures led to the same total ligand concentration. When catechin was used as model ligand, a 1: 1 ratio
was found for Zn and also for Cu.