An integrated platform for gas-diffusion separation and electrochemical determination of ethanol on fermentation broths

Giordano, Gabriela F.; Vieira, Luis Carlos Silveira; Gobbi, Ângelo L.; Lima, Renato S.; Kubota, Lauro T.

doi:10.1016/j.aca.2015.03.014

Cited by 13 publications

(30 citation statements)

References 53 publications

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“…15,23−26 The electrodeposition of Ni(OH) 2 NPs on the Ni surface is simple, rapid, and reproducible. 23 O), pentane, hexane, heptane, toluene, dichloromethane, and cyclohexane were supplied from Sigma−Aldrich (St. Louis, USA), whereas acetone and acetic acid were attained from Labsynth (Saõ Paulo, Brazil). Four samples of NGC were provided by Petrobras, which is a Brazilian multinational energy corporation.…”

Section: Introductionmentioning

confidence: 99%

Turbulence-Assisted High-Throughput Liquid–Liquid Extraction in Microfluidics and Ni(OH)₂ Nanoparticles for Electrochemical Determination of Monoethylene Glycol Traces in Natural Gas Condensate

et al. 2018

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While monoethylene glycol (MEG) is an efficient alternative to prevent the generation of hydrates into the natural gas (NG) processing pipes, this specie also generates undesirable effects such as pipe corrosion, catalyst poisoning, quality loss of the fuel, and environment contamination. Thus, MEG is removed from the system in final stages of the NG processing and is regenerated for reuse, making mandatory its monitoring in both regenerated samples and fuels such as the NG condensate (NGC). Herein, we address a simple and fast method to determine MEG traces in NGC which was based on two stages: microfluidic liquid−liquid extraction (LLE) and electrochemical detection. High throughput (residence time of 0.05 s) and efficient LLEs were obtained in a single run by pumping the immiscible phases at harsh flow rates (up to 40 mL min −1 ) into a bulky chip (without interface) composed of bisphenol A (BSA)-based epoxy resin, which was prototyped using a clean-room-free and bondless approach. This unprecedented substrate in microfluidics showed resistance to elastic deformation and swelling in different organic media. The extraction was essential to allow the electrochemical determination of MEG, in which the aqueous acceptor phase from LLE was used as an electrolytic sample. Nickel disks modified with Ni(OH) 2 nanoparticles provided a sensitive quantification of MEG, because of the high electrode surface area and catalytic activity of Ni(OH) 2 for the irreversible oxidation of MEG. This electrode further requires a simple surface modification. We believe the method reported in this manuscript is a powerful alternative to monitor MEG in NGC samples by the industry.

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Section: Introductionmentioning

confidence: 99%

Turbulence-Assisted High-Throughput Liquid–Liquid Extraction in Microfluidics and Ni(OH)₂ Nanoparticles for Electrochemical Determination of Monoethylene Glycol Traces in Natural Gas Condensate

et al. 2018

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“…Many efforts are being made to find new non‐enzymatic electrocatalytic materials for oxidation of fructose, glucose and ethanol. There have been described multi‐wall carbon nanotubes containing copper oxide nanoparticles , nickel hydroxide modified electrode , gold nanoparticle‐constituted nanotube array electrode , nanoporous platinum−cobalt alloy electrode and glassy carbon electrode modified with multi‐wall carbon nanotubes and nickel oxy‐hydroxide .…”

Section: Introductionmentioning

confidence: 99%

Multivariate Determination of Total Sugar Content and Ethanol in Bioethanol Production Using Carbon Electrodes Modified with MWCNT/MeOOH and Chemometric Data Treatment

et al. 2018

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This work reports the characterization and application of a voltammetric electronic tongue using an array of glassy carbon electrodes modified with multi‐walled carbon nanotubes containing metal (Pd, Au, Cu) and oxy‐hydroxide nanoparticles (MetalsOOH of Ni, Co) towards the determination of total sugar content in products related with sugarcane‐bioethanol production. The prediction model based on Artificial Neural Networks (ANN) has given satisfactory results for the carbohydrate sum and the obtained response had shown an adequate accuracy. Voltammetric data was first adapted for the computation using the Fast Fourier transform, and results from the electronic tongue approach were compared with use of different electrodes alone. Final performance was better using uniquely the Ni oxy‐hydroxide modified electrode, especially in the quantification of ethanol, a side‐effect of counter‐balancing its interference.

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“…These samples usually require indirect methods for accurate determination of ethanol due to chemical complexity. Herein, outputs applied for ensuring selective analyses include HPLC, 16 electrophoresis, 17 and gas diffusion separation, 18 generally with electrochemical or optical detection. Astoundingly, we present in this study the direct determination of ethanol in fermentation broths of sugar cane by employing just MEC with visual detection; even the dilution of samples was bypassed.…”

Section: Introductionmentioning

confidence: 99%

Microemulsification-based method: analysis of ethanol in fermentation broth of sugar cane

et al. 2015

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This article addresses important results for the consolidation of the microemulsification-based method (MEC), an approach recently proposed by these authors, which represents a powerful output for the deployment of point-of-use technologies. In MEC, the detection is conducted in a solution with the naked eyes. It relies on the effect of the analyte on the formation of microemulsions (MEs). The minimum volume fraction of amphiphile needed to obtain ME (F ME ) is the analytical response whose measurement is based on binary chemical information: the cloudy-to-transparent transition that occurs with microemulsification. Accordingly, this signal can be precisely detected with the naked eye, thus enabling precise determinations. The experiments that were accomplished are as follows: robustness investigation and the direct determination of ethanol in fermentation broths of sugar cane. Dispersions were composed of water, oleic acid, and ethanol as hydrophilic (W), hydrophobic (O), and amphiphilic (AP) phases, respectively. Standards of analyte were added to the W phase before the addition of AP in the W-O mixture to attain the analytical curves. For application, the samples were directly used as the W phase. Our approach was somewhat robust with regard to deviations in volumetric preparation of the dispersions and changes in temperature and conductivity. Lastly, the reliability of the MEC was evaluated in the determination of ethanol in fermentation broths of sugar cane. The results were astoundingly accurate after direct analyses with the naked-eye detection. Usually, for these samples the dilution and separation steps require tools such as chromatography and electrophoresis. Limit of linearity, analytical sensitivity, and limit of detection were 70.00% v/v ethanol to water, À0.39, and 1.34% v/v, respectively.MEC stands out in relation to the other methods reported in literature for the determination of ethanol in alcoholic beverages and fermentation broths when considering parameters of wide linearity and lowcost. Indeed, our method is unique in ensuring precise determinations without instrumental detection, requiring only the naked eye. It represents a remarkable aspect for point-of-use measurements. In contrast, MEC is not applicable for trace chemical analyses because of its poor limit of detection.

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An integrated platform for gas-diffusion separation and electrochemical determination of ethanol on fermentation broths

Cited by 13 publications

References 53 publications

Turbulence-Assisted High-Throughput Liquid–Liquid Extraction in Microfluidics and Ni(OH)₂ Nanoparticles for Electrochemical Determination of Monoethylene Glycol Traces in Natural Gas Condensate

Turbulence-Assisted High-Throughput Liquid–Liquid Extraction in Microfluidics and Ni(OH)₂ Nanoparticles for Electrochemical Determination of Monoethylene Glycol Traces in Natural Gas Condensate

Multivariate Determination of Total Sugar Content and Ethanol in Bioethanol Production Using Carbon Electrodes Modified with MWCNT/MeOOH and Chemometric Data Treatment

Microemulsification-based method: analysis of ethanol in fermentation broth of sugar cane

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An integrated platform for gas-diffusion separation and electrochemical determination of ethanol on fermentation broths

Cited by 13 publications

References 53 publications

Turbulence-Assisted High-Throughput Liquid–Liquid Extraction in Microfluidics and Ni(OH)2 Nanoparticles for Electrochemical Determination of Monoethylene Glycol Traces in Natural Gas Condensate

Turbulence-Assisted High-Throughput Liquid–Liquid Extraction in Microfluidics and Ni(OH)2 Nanoparticles for Electrochemical Determination of Monoethylene Glycol Traces in Natural Gas Condensate

Multivariate Determination of Total Sugar Content and Ethanol in Bioethanol Production Using Carbon Electrodes Modified with MWCNT/MeOOH and Chemometric Data Treatment

Microemulsification-based method: analysis of ethanol in fermentation broth of sugar cane

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Turbulence-Assisted High-Throughput Liquid–Liquid Extraction in Microfluidics and Ni(OH)₂ Nanoparticles for Electrochemical Determination of Monoethylene Glycol Traces in Natural Gas Condensate

Turbulence-Assisted High-Throughput Liquid–Liquid Extraction in Microfluidics and Ni(OH)₂ Nanoparticles for Electrochemical Determination of Monoethylene Glycol Traces in Natural Gas Condensate