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Abdollahi Aghdam A, Majidi MR, Veladi H, Omidi Y. Microfluidic-based separation and detection of synthetic antioxidants by integrated gold electrodes followed by HPLC-DAD. Microchem J 2019. [DOI: 10.1016/j.microc.2019.104059] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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2
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Ortolani TS, Pereira TS, Assumpção MH, Vicentini FC, Gabriel de Oliveira G, Janegitz BC. Electrochemical sensing of purines guanine and adenine using single-walled carbon nanohorns and nanocellulose. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2018.12.114] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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3
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Moreira RC, Costa BMC, Marra MC, Santana MHP, Maldaner AO, Botelho ÉD, Paixão TRLC, Richter EM, Coltro WKT. Screening of seized cocaine samples using electrophoresis microchips with integrated contactless conductivity detection. Electrophoresis 2018; 39:2188-2194. [PMID: 29947145 DOI: 10.1002/elps.201800137] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Revised: 06/09/2018] [Accepted: 06/10/2018] [Indexed: 11/11/2022]
Abstract
This study describes the development of a new analytical method for the separation and detection of cocaine (COC) and its adulterants, or cutting agents, using microchip electrophoresis (ME) devices coupled with capacitively coupled contactless conductivity detection (C4 D). All the experiments were carried out using a glass commercial ME device containing two pairs of integrated sensing electrodes. The running buffer composed of 20 mmol/L amino-2-(hydroxymethyl) propane-1,3-diol and 10 mmol/L 3,4-dimethoxycinnamic acid provided the best separation conditions for COC and its adulterants with baseline resolution (R > 1.6), separation efficiencies ranging from (2.9 ± 0.1) to (3.2 ± 0.2) × 105 plates/m, and estimated LOD values between 40 and 150 μmol/L. The quantification of COC was successfully performed in four samples seized by the Brazilian Federal Police Department and all predicted values agree with values estimated by the reference method. Some other interfering species were detected in the seized samples during the screening procedure on ME-C4 D devices. While lidocaine was detected in sample 3, the presence of levamisole was observed in samples 2 and 4. However, their concentrations were estimated to be below the LOQ. ME-C4 D devices have proved to be quite efficient for the identification and quantification of COC with errors lower than 10% when compared to the data obtained by a reference method. The approach herein reported offers great potential to be used for on-site COC screening in seized samples.
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Affiliation(s)
| | - Brenda M C Costa
- Instituto de Química, Universidade Federal de Uberlândia, Uberlândia, MG, Brazil
| | - Mariana C Marra
- Instituto de Química, Universidade Federal de Uberlândia, Uberlândia, MG, Brazil
| | - Mario H P Santana
- Instituto Nacional de Criminalística, Polícia Federal Brasileira, Brasília, DF, Brazil
| | - Adriano O Maldaner
- Unidade Técnico-Científica, Superintendência Regional da Polícia Federal em MG, Uberlândia, MG, Brazil
| | - Élvio D Botelho
- Unidade Técnico-Científica, Superintendência Regional da Polícia Federal em MG, Uberlândia, MG, Brazil
| | | | | | - Wendell K T Coltro
- Instituto de Química, Universidade Federal de Goiás, Goiânia, GO, Brazil
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Lian DS, Zeng HS. Capillary Electrophoresis Based on Nucleic Acid Detection as Used in Food Analysis. Compr Rev Food Sci Food Saf 2017; 16:1281-1295. [DOI: 10.1111/1541-4337.12297] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Revised: 07/14/2017] [Accepted: 07/19/2017] [Indexed: 12/21/2022]
Affiliation(s)
- Dong-Sheng Lian
- Guangzhou Women and Children's Medical Center of Guangzhou Medical University; NO. 9 at Jinsui Rd., Tianhe District Guangzhou Guangdong China
| | - Hua-Song Zeng
- Guangzhou Women and Children's Medical Center of Guangzhou Medical University; NO. 9 at Jinsui Rd., Tianhe District Guangzhou Guangdong China
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High performance separation of quaternary amines using microchip non-aqueous electrophoresis coupled with contactless conductivity detection. J Chromatogr A 2017; 1499:190-195. [PMID: 28396087 DOI: 10.1016/j.chroma.2017.03.062] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2017] [Revised: 03/22/2017] [Accepted: 03/23/2017] [Indexed: 01/29/2023]
Abstract
This study describes the development of an analytical methodology for the separation of quaternary amines using non-aqueous microchip electrophoresis (NAME) coupled with capacitively coupled contactless conductivity detection (C4D). All experiments were performed using a commercial microchip electrophoresis system consisting of a C4D detector, a high-voltage sequencer and a microfluidic platform to assemble a glass microchip with integrated sensing electrodes. The detection parameters were optimized and the best response was reached applying a 700-kHz sinusoidal wave with 14Vpp excitation voltage. The running electrolyte composition was optimized aiming to achieve the best analytical performance. The mixture containing methanol and acetonitrile at the proportion of 90:10 (v:v) as well as sodium deoxycholate provided separations of ten quaternary amines with high efficiency and baseline resolution. The separation efficiencies ranged from 8.7×104 to 3.0×105 plates/m. The proposed methodology provided linear response in the concentration range between 50 and 1000μmol/L and limits of detection between 2 and 27μmol/L. The analytical feasibility of the proposed methodology was tested in the determination of quaternary amines in corrosion inhibitor samples often used for coating oil pipelines. Five quaternary amines (dodecyltrimethylammonium chloride, tetradecyltrimetylammonium bromide, cetyltrimethylammonium bromide, tetraoctylammonium bromide and tetradodecylammonium bromide) were successfully detected at concentration levels from 0.07 to 6.45mol/L. The accuracy of the developed methodology was investigated and the achieved recovery values varied from 85 to 122%. Based on the reported data, NAME-C4D devices exhibited great potential to provide high performance separations of hydrophobic compounds. The developed methodology can be useful for the analysis of species that usually present strong adsorption on the channel inner walls.
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Lian DS, Zhao SJ. Capillary electrophoresis based on nucleic acid detection for diagnosing human infectious disease. Clin Chem Lab Med 2017; 54:707-38. [PMID: 26352354 DOI: 10.1515/cclm-2015-0096] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2015] [Accepted: 06/17/2015] [Indexed: 01/22/2023]
Abstract
Rapid transmission, high morbidity, and mortality are the features of human infectious diseases caused by microorganisms, such as bacteria, fungi, and viruses. These diseases may lead within a short period of time to great personal and property losses, especially in regions where sanitation is poor. Thus, rapid diagnoses are vital for the prevention and therapeutic intervention of human infectious diseases. Several conventional methods are often used to diagnose infectious diseases, e.g. methods based on cultures or morphology, or biochemical tests based on metabonomics. Although traditional methods are considered gold standards and are used most frequently, they are laborious, time consuming, and tedious and cannot meet the demand for rapid diagnoses. Disease diagnosis using capillary electrophoresis methods has the advantages of high efficiency, high throughput, and high speed, and coupled with the different nucleic acid detection strategies overcomes the drawbacks of traditional identification methods, precluding many types of false positive and negative results. Therefore, this review focuses on the application of capillary electrophoresis based on nucleic detection to the diagnosis of human infectious diseases, and offers an introduction to the limitations, advantages, and future developments of this approach.
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A review on recent developments for biomolecule separation at analytical scale using microfluidic devices. Anal Chim Acta 2016; 906:7-21. [DOI: 10.1016/j.aca.2015.11.037] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Revised: 11/24/2015] [Accepted: 11/25/2015] [Indexed: 02/05/2023]
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Freitas CB, Moreira RC, de Oliveira Tavares MG, Coltro WK. Monitoring of nitrite, nitrate, chloride and sulfate in environmental samples using electrophoresis microchips coupled with contactless conductivity detection. Talanta 2016; 147:335-41. [DOI: 10.1016/j.talanta.2015.09.075] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Revised: 09/29/2015] [Accepted: 09/30/2015] [Indexed: 10/22/2022]
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Öncü-Kaya EM, Uysal UD, Ozturk N, Cenkci S, Tuncel M. Determination of DNA in Certain Salvia Species by Capillary Gel Electrophoresis. J LIQ CHROMATOGR R T 2015. [DOI: 10.1080/10826076.2015.1053913] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Elif Mine Öncü-Kaya
- Department of Chemistry, Faculty of Science, Anadolu University, Yunusemre Campus, Eskisehir, Turkey
| | - Ulku Dilek Uysal
- Department of Chemistry, Faculty of Science, Anadolu University, Yunusemre Campus, Eskisehir, Turkey
| | - Nilgun Ozturk
- Department of Pharmacognosy, Faculty of Pharmacy, Anadolu University, Eskisehir, Turkey
| | - Suleyman Cenkci
- Department of Molecular Biology and Genetics, Faculty of Science and Arts, Afyon Kocatepe University, Turkey
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Islam K, Chand R, Han D, Kim YS. Microchip capillary electrophoresis based electroanalysis of triazine herbicides. BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2015; 94:41-45. [PMID: 25231112 DOI: 10.1007/s00128-014-1378-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Accepted: 09/05/2014] [Indexed: 06/03/2023]
Abstract
The number of pesticides used in agriculture is increasing steadily, leading to contamination of soil and drinking water. Herein, we present a microfluidic platform to detect the extent of contamination in soil samples. A microchip capillary electrophoresis system with in-channel electrodes was fabricated for label-free electroanalytical detection of triazine herbicides. The sample mixture contained three representative triazines: simazine, atrazine and ametryn. The electropherogram for each individual injection of simazine, atrazine and ametryn showed peaks at 58, 66 and 72 s whereas a mixture of them showed distinct peaks at 59, 67 and 71 s respectively. The technique as such may prove to be a useful qualitative and quantitative tool for the similar environmental pollutants.
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Affiliation(s)
- Kamrul Islam
- Complex Fluids Research Laboratory, Korea Institute of Science and Technology, Seoul, 136-791, Republic of Korea
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Ghanim MH, Najimudin N, Ibrahim K, Abdullah MZ. Low electric field DNA separation and in‐channel amperometric detection by microchip capillary electrophoresis. IET Nanobiotechnol 2014; 8:77-82. [DOI: 10.1049/iet-nbt.2012.0044] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Affiliation(s)
- Motasem Hilmi Ghanim
- School of Electrical and Electronic EngineeringUniversiti Sains MalaysiaEngineering CampusPenang 14300Malaysia
| | - Nazalan Najimudin
- School of Biological SciencesUniversiti Sains MalaysiaPenang 11800Malaysia
| | | | - Mohd Zaid Abdullah
- School of Electrical and Electronic EngineeringUniversiti Sains MalaysiaEngineering CampusPenang 14300Malaysia
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12
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Chand R, Han D, Kim YS. Voltammetric Analysis on a Disposable Microfluidic Electrochemical Cell. B KOREAN CHEM SOC 2013. [DOI: 10.5012/bkcs.2013.34.4.1175] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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13
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Ghanim MH, Abdullah MZ. Design of disposable DNA biosensor microchip with amperometric detection featuring PCB substrate. BIOCHIP JOURNAL 2013. [DOI: 10.1007/s13206-013-7108-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Chand R, Kumar Jha S, Islam K, Han D, Shin IS, Kim YS. Analytical detection of biological thiols in a microchip capillary channel. Biosens Bioelectron 2013; 40:362-7. [DOI: 10.1016/j.bios.2012.08.009] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2012] [Revised: 08/03/2012] [Accepted: 08/03/2012] [Indexed: 01/30/2023]
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Abstract
Cysteine and homocysteine are the biological thiols which have an important function in various biochemical processes in our body. Alterations in their level lead to various abnormalities. Therefore, we fabricated a miniaturized platform for capillary electrophoresis that could separate and detect these amino thiols electrochemically. The device was fabricated using conventional photolithography technique on the glass substrate. The microchannel was molded in polydimethylsiloxane with gold electrodes deposited on glass for separation and detection. Based on the amperometric detection, we could detect cysteine in 93 sec while homocysteine was detected in 111 sec.
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Jha SK, Chand R, Han D, Jang YC, Ra GS, Kim JS, Nahm BH, Kim YS. An integrated PCR microfluidic chip incorporating aseptic electrochemical cell lysis and capillary electrophoresis amperometric DNA detection for rapid and quantitative genetic analysis. LAB ON A CHIP 2012; 12:4455-64. [PMID: 22960653 DOI: 10.1039/c2lc40727b] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A fully integrated microchip for performing cell lysis, polymerase chain reaction (PCR) and quantitative analysis of DNA amplicons in a single step is described herein. The chip was built on glass substrate using an indium-tin-oxide (ITO) microheater and PDMS engraved microchannels, which integrated an electrochemical cell lysis zone, a continuous flow PCR module and capillary electrophoresis amperometric detection (CE-AD) system. The total length of the microchannel was 4625 mm for performing 25 cycles of flow-through PCR and was laid on a handheld form factor of 96 × 96 mm(2) area. The key to the fabrication of such a device lies in the use of a single medium to carry out different kinds of biochemical reactions and hence, a reagentless electrochemical cell lysis protocol was integrated on the microchip which was capable of lysing most cell types, including difficult to lyse gram positive bacteria. The lysate contained genomic DNA from a sample which was proven to be suitable for PCR reactions. Genetic analysis was successfully performed on the microchip with purified lambda phage genomic DNA and various cell types, including non-tumorigenic MCF-10A and tumorigenic MCF-7 human cell lines, gram negative bacteria Escherichia coli O157:H7, and gram positive bacteria Bacillus subtilis, at an optimized flow rate of 5 μl min(-1). For the detection of amplicon DNA, a CE-AD system was used, with semisolid alkaline agarose within the capillary microchannel to minimize interference from cell debris and for efficient resolution of DNA fragments. High signal to noise ratio during amperometric detection and the use of online FFT filtering protocol enhanced the limit of detection of DNA amplicons. Therefore, with a combination of portability, cost-effectiveness and performance, the proposed integrated PCR microchip can be used for one step genetic analysis of most of the cell types and will enable more accessible healthcare.
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Affiliation(s)
- Sandeep Kumar Jha
- Department of Nanoscience and Engineering, Myongji University, Yongin, Gyeonggi, Korea
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Mark JJP, Scholz R, Matysik FM. Electrochemical methods in conjunction with capillary and microchip electrophoresis. J Chromatogr A 2012; 1267:45-64. [PMID: 22824222 DOI: 10.1016/j.chroma.2012.07.009] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2012] [Revised: 07/01/2012] [Accepted: 07/06/2012] [Indexed: 02/06/2023]
Abstract
Electromigrative techniques such as capillary and microchip electrophoresis (CE and MCE) are inherently associated with various electrochemical phenomena. The electrolytic processes occurring in the buffer reservoirs have to be considered for a proper design of miniaturized electrophoretic systems and a suitable selection of buffer composition. In addition, the control of the electroosmotic flow plays a crucial role for the optimization of CE/MCE separations. Electroanalytical methods have significant importance in the field of detection in conjunction with CE/MCE. At present, amperometric detection and contactless conductivity detection are the predominating electrochemical detection methods for CE/MCE. This paper reviews the most recent trends in the field of electrochemical detection coupled to CE/MCE. The emphasis is on methodical developments and new applications that have been published over the past five years. A rather new way for the implementation of electrochemical methods into CE systems is the concept of electrochemically assisted injection which involves the electrochemical conversions of analytes during the injection step. This approach is particularly attractive in hyphenation to mass spectrometry (MS) as it widens the range of CE-MS applications. An overview of recent developments of electrochemically assisted injection coupled to CE is presented.
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Affiliation(s)
- Jonas J P Mark
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, Regensburg, Germany
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Tsai CH, Lin CH, Fu LM, Chen HC. High-performance microfluidic rectifier based on sudden expansion channel with embedded block structure. BIOMICROFLUIDICS 2012; 6:24108-241089. [PMID: 22655019 PMCID: PMC3360723 DOI: 10.1063/1.4704504] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2012] [Accepted: 03/28/2012] [Indexed: 05/11/2023]
Abstract
A high-performance microfluidic rectifier incorporating a microchannel and a sudden expansion channel is proposed. In the proposed device, a block structure embedded within the expansion channel is used to induce two vortex structures at the end of the microchannel under reverse flow conditions. The vortices reduce the hydraulic diameter of the microchannel and, therefore, increase the flow resistance. The rectification performance of the proposed device is evaluated by both experimentally and numerically. The experimental and numerical values of the rectification performance index (i.e., the diodicity, Di) are found to be 1.54 and 1.76, respectively. Significantly, flow rectification is achieved without the need for moving parts. Thus, the proposed device is ideally suited to the high pressure environment characteristic of most micro-electro-mechanical-systems (MEMS)-based devices. Moreover, the rectification performance of the proposed device is superior to that of existing valveless rectifiers based on Tesla valves, simple nozzle/diffuser structures, or cascaded nozzle/diffuser structures.
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Lin CH, Wang YN, Fu LM. Integrated microfluidic chip for rapid DNA digestion and time-resolved capillary electrophoresis analysis. BIOMICROFLUIDICS 2012; 6:12818-1281811. [PMID: 22662085 PMCID: PMC3365337 DOI: 10.1063/1.3654950] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2011] [Accepted: 10/01/2011] [Indexed: 05/09/2023]
Abstract
An integrated microfluidic chip is proposed for rapid DNA digestion and time-resolved capillary electrophoresis (CE) analysis. The chip comprises two gel-filled chambers for DNA enrichment and purification, respectively, a T-form micromixer for DNA/restriction enzyme mixing, a serpentine channel for DNA digestion reaction, and a CE channel for on-line capillary electrophoresis analysis. The DNA and restriction enzyme are mixed electroomostically using a pinched-switching DC field. The experimental and numerical results show that a mixing performance of 97% is achieved within a distance of 1 mm from the T-junction when a driving voltage of 90 V/cm and a switching frequency of 4 Hz are applied. Successive mixing digestion and capillary electrophoresis operation clearly present the changes on digesting φx-174 DNA in different CE runs. The time-resolved electropherograms show that the proposed device enables a φx-174 DNA sample comprising 11 fragments to be concentrated and analyzed within 24 min. Overall, the results presented in this study show that the proposed microfluidic chip provides a rapid and effective tool for DNA digestion and CE analysis applications.
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Ju WJ, Fu LM, Yang RJ, Lee CL. Distillation and detection of SO2 using a microfluidic chip. LAB ON A CHIP 2012; 12:622-6. [PMID: 22159042 DOI: 10.1039/c1lc20954j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
A miniaturized distillation system is presented for separating sulfurous acid (H(2)SO(3)) into sulfur dioxide (SO(2)) and water (H(2)O). The major components of the proposed system include a microfluidic distillation chip, a power control module, and a carrier gas pressure control module. The microfluidic chip is patterned using a commercial CO(2) laser and comprises a serpentine channel, a heating zone, a buffer zone, a cooling zone, and a collection tank. In the proposed device, the H(2)SO(3) solution is injected into the microfluidic chip and is separated into SO(2) and H(2)O via an appropriate control of the distillation time and temperature. The gaseous SO(2) is then transported into the collection chamber by the carrier gas and is mixed with DI water. Finally, the SO(2) concentration is deduced from the absorbance measurements obtained using a spectrophotometer. The experimental results show that a correlation coefficient of R(2) = 0.9981 and a distillation efficiency as high as 94.6% are obtained for H(2)SO(3) solutions with SO(2) concentrations in the range of 100-500 ppm. The SO(2) concentrations of two commercial red wines are successfully detected using the developed device. Overall, the results presented in this study show that the proposed system provides a compact and reliable tool for SO(2) concentration measurement purposes.
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Affiliation(s)
- Wei-Jhong Ju
- Department of Engineering Science, National Cheng Kung University, Tainan, 701, Taiwan
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