A fully integrated 3D printed platform for sulfite determination in beverages via gas diffusion membrane extraction and digital video treatment

Fernandes, Gabriel Martins; Barreto, Diandra Nunes; Batista, Alex D.; Petruci, João Flávio da Silveira

doi:10.1016/j.foodchem.2022.135094

Cited by 6 publications

(1 citation statement)

References 28 publications

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“…Moreover, the incorporation of substances within the printing materials to modify and optimize their functionalities is increasingly demonstrated . In the field of analytical chemistry, 3D-printing has been widely used for the fabrication of tailored components integrated into analytical systems and for the fabrication of electrochemical (bio)sensors. − …”

Section: Introductionmentioning

confidence: 99%

Fabrication of Low-Cost Miniaturized Gas Cells via SLA 3D-Printing for UV-Based Gas Sensors

Barreto,

Gelamo,

Mizaikoff

et al. 2024

ACS Omega

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The use of 3D-printing technology for producing optical devices (i.e., mirrors and waveguides) remains challenging, especially in the UV spectral regime. Gas sensors based on absorbance measurements in the UV region are suitable for determining numerous volatile species in a variety of samples and analytical scenarios. The performance of absorbance-based gas sensors is dependent on the ability of the gas cell to propagate radiation across the absorption path length and facilitate interaction between photons and analytes. In this technical note, we present a 3D-printed substrate-integrated hollow waveguide (iHWG) to be used as a miniaturized and ultralightweight gas cell used in UV gas-sensing schemes. The substrates were fabricated via UV stereolithography and polished, and the light-guiding channel was coated with aluminum for UV reflectivity. This procedure resulted in a surface roughness of 11.2 nm for the reflective coating, yielding a radiation attenuation of 2.25 W/cm2. The 3D-printed iHWG was coupled to a UV light source and a portable USB-connected spectrometer. The sensing device was applied for the quantification of isoprene and acetone, serving as a proof-of-concept study. Detection limits of 0.22 and 0.03% in air were obtained for acetone and isoprene, respectively, with a nearly instantaneous sensor response. The development of portable, low-cost, and ultralightweight UV optical sensors enables their use in a wide range of scenarios ranging from environmental monitoring to clinical/medical applications.

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