Determination of copper labile species in wine using diffusive gradients in thin-films technique with open and restricted diffusive gels
Year: 2025
Type: article
Abstract: Copper labile species are involved in oxidation reactions in wine, thus affecting its quality and long-term stability. Consequently, the development of analytical methods capable of assessing the Cu labile fraction in wine is highly important. In this work, we developed an analytical methodology based on the use of the Diffusive Gradient in Thin-films (DGT) technique as passive sampling tool for DGT-labile species, followed by Cu determination using graphite furnace atomic absorption spectrometry (GF-AAS). DGT devices with Chelex resin gel and two types of diffusive gels, open pore (OP) and restricted pore (RP), were used in the experiments. The effective diffusion coefficients of Cu, determined in 12 % ethanol in water solution at 22 °C and pH 3.0, were (5.15 ± 0.28) × 10 −6 cm 2 s −1 for the OP gel and (4.47 ± 0.26) × 10 −6 cm 2 s −1 for the RP gel. Linearity assays for DGT in wine were evaluated over a 48-h deployment period, yielding determination coefficients of 0.9932 and 0.9867 for OP and RP, respectively. No significant differences were found for the Cu DGT-labile concentrations sampled using tools with OP or RP gels. The DGT-labile fraction of Cu in the seven analysed wine samples ranged from 7.0 to 33.1 μg L −1 , representing approximately 6.6 to 11.2 % of the total Cu concentration in the wine. By measuring Cu-labile species, producers in the winery sector can better control the Cu content in wine.
Source: Microchemical Journal
Authors: Marin Senila, Simion Bogdan Angyus
Language: English
Subfield: Analytical Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,000
Award: G6429460111
OpenAlex ID: W4411402741