Analysis of free and total sulfur dioxide in wine by using a gas-diffusion analytical system with pH detection.
The use of sulfur dioxide as preservative in winemaking industry has a direct impact on wine quality. The standard methods to analyze this parameter require several processes and are time consuming. In this paper a simple and rapid analytical method for free and total sulfur dioxide detection is proposed. This method is based on the separation of the analyte from the sample with a permeable gas diffusion membrane and its indirect detection with a pH sensor. The system has been validated and optimized for free sulfur dioxide detection in the range of 1-60mgL-1and for total sulfur dioxide in the range of 30-300mgL-1with a limit of detection of 0.5mgL-1. Validation of the system has been carried out using a total of 70 samples of white and red wines and two standard methods, the Ripper and the Paul method. The obtained values have demonstrated a good agreement for both methods.
Instituto de Microelectrónica de Barcelona (IMB-CNM), CSIC, Campus UAB, 08193 Bellaterra, Spain.
Pablo
P
Giménez-Gómez
Instituto de Microelectrónica de Barcelona (IMB-CNM), CSIC, Campus UAB, 08193 Bellaterra, Spain.
Manuel
M
Gutiérrez-Capitán
Institut Català de la Vinya i el Vi (IRTA-INCAVI), Plaça Àgora 2, 08720 Vilafranca del Penedès, Spain.
Anna
A
Puig-Pujol
Institut Català de la Vinya i el Vi (IRTA-INCAVI), Plaça Àgora 2, 08720 Vilafranca del Penedès, Spain.
Fina
F
Capdevila
BioSystems S.A., c/ Costa Brava 30, 08030 Barcelona, Spain.
Sergio
S
Muñoz
BioSystems S.A., c/ Costa Brava 30, 08030 Barcelona, Spain.
Andreu
A
Tobeña
Linking Innovations, S.L., c/ Costa Brava 22, 1ª, 08030 Barcelona, Spain.
Antoni
A
Miró
Instituto de Microelectrónica de Barcelona (IMB-CNM), CSIC, Campus UAB, 08193 Bellaterra, Spain. Electronic address: cecilia.jimenez@csic.es.
Cecilia
C
Jiménez-Jorquera
D004058:Diffusion; D006863:Hydrogen-Ion Concentration; D013458:Sulfur Dioxide / Q000032:analysis / Q000737:chemistry*; D014920:Wine / Q000032:analysis*
D013458:Sulfur Dioxide
Flow-system; Free and total sulfur dioxide; Gas-diffusion; Wine monitoring; pH-ISFET