Low cost and compact analytical microsystem for carbon dioxide determination in production processes of wine and beer
Calvo-Lopez, Antonio (Universitat Autònoma de Barcelona. Departament de Química)
Ymbern, Oriol (Universitat Autònoma de Barcelona. Departament de Química)
Izquierdo, David (Universidad de Zaragoza)
Alonso Chamarro, Julián (Universitat Autònoma de Barcelona. Departament de Química)

Data:	2016
Resum:	The design, construction and evaluation of a low cost, cyclic olefin copolymer (COC)-based continuous flow microanalyzer, with optical detection, to monitor carbon dioxide in bottled wines and beers as well as in fermentation processes, is presented. The microsystem, constructed by computer numerically controlled (CNC) micromilling and using a multilayer approach, integrates microfluidics, gas-diffusion module and an optical flow-cell in a single polymeric substrate. Its size is slightly bigger than a credit card, exactly 45 × 60 × 4 mm in the microfluidic and diffusion module zone and 22. 5 × 40 × 3 mm in the flow-cell zone. The gas-diffusion module is based on a hydrophobic polyvinylidene fluoride (PVDF) membrane, which allows the transfer of the carbon dioxide present in the sample to a bromothymol blue (BTB) pH-sensitive acceptor solution, where the color change is measured optically. The detection system consisted of a LED with an emission peak at 607 nm and a photodiode integrated in a printed circuit board (PCB). The obtained analytical features after the optimization of the microfluidic platform and hydrodynamic variables are a linear range from 255 to 10000 mg L−1 of CO2 and a detection limit of 83 mg L−1 with a sampling rate of 30 samples h−1.
Ajuts:	Ministerio de Ciencia e Innovación CTQ2012-36165 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-837
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Carbon dioxide ; Cyclic olefin co-polymer ; Gas-diffusion ; Lab on a chip ; Miniaturization ; Optical detection
Publicat a:	Analytica chimica acta, Vol. 931 (August 2016) , p. 64-69, ISSN 1873-4324

DOI: 10.1016/j.aca.2016.05.010

Postprint 27 p, 2.7 MB

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