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Multi-well plate as headspaces for paper-based colorimetric detection of sulfur dioxide gas: An alternative method of sulfite titration for determination of formaldehyde. Anal Chim Acta 2023; 1239:340704. [PMID: 36628712 DOI: 10.1016/j.aca.2022.340704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 11/18/2022] [Accepted: 12/03/2022] [Indexed: 12/13/2022]
Abstract
This work describes the analysis of formaldehyde using a 96-well microplate as multiple headspaces for the separation of sulfur dioxide gas generated from the sulfite remaining after its reaction with the formaldehyde in the sample. The quantitation of the gas is by colorimetric detection of an indicator paper placed over the microplate. The samples are aqueous extracts of various foods that are possibly adulterated with formaldehyde. A known excess amount of sulfite is added to the extract solution aliquoted in the well. The remaining sulfite is acidified with hydrochloric acid to generate sulfur dioxide gas which diffuses through the headspace above the solution to be absorbed at the moist strip of the indicator paper placed over the mouth of the wells. Anthocyanins extracted from the butterfly pea flower is used as the pH indicator giving a color change from the increase of hydrogen ions by hydrolysis of the absorbed sulfur dioxide gas. The exposed paper strip is scanned, and the digital images of the colored region analyzed using ImageJ software. The optimized method has a linear range of 200-1000 mg L-1 formaldehyde with limit of detection ((2.57*SD of intercept)/(slope of calibration line)) of the aqueous extract of 40 mg L-1 and coefficient of determination (r2) > 0.9979. Samples of fresh produce, such as seafood, meat, and vegetables, and various processed food were analyzed for their possible formaldehyde content. The results obtained from the headspace paper-based colorimetric detection are not statistically different from the values obtained from the titration method by paired t-tests.
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2
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Carbon dioxide spectrophotometric determination in whole roasted coffee beans using a total analysis system after super-modified simplex optimization. J Food Compost Anal 2023. [DOI: 10.1016/j.jfca.2022.104978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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3
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Phouthavong V, Inoue H, Phomkeona K, Chounlamany V. Home-Made Membraneless Vaporization Gas-Liquid Separator for Colorimetric Determination of Ethanol in Alcoholic Beverages. JOURNAL OF ANALYTICAL METHODS IN CHEMISTRY 2022; 2022:7346253. [PMID: 35402059 PMCID: PMC8989598 DOI: 10.1155/2022/7346253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Revised: 03/08/2022] [Accepted: 03/21/2022] [Indexed: 06/14/2023]
Abstract
This work utilized the simplicity of a so-called membraneless vaporization (MBL-VP) unit as a gas separator for the colorimetric determination of ethanol in alcoholic beverages. A beverage sample with a volume of 1 mL was directly injected into a small container which was hung from a lid inside a closed 40 mL reused glass bottle without pretreatment such as distillation. An acidified potassium dichromate (Cr2O7 2-) acceptor solution, preadded to the glass bottle, was reduced to Chromium (III) ion by the diffusion of vaporized ethanol from the sample. After 5 min, the absorbing solution was collected for colorimetric detection at 590 nm. The unit manually quantifies ethanol in the range 1.0-90% (v/v) with satisfactory interday precision but without matrix effect (recovery 89-109%). The method was validated with the conventional distillation/pycnometer method which showed no significant difference of ethanol contents between those two methods and the declared values of 12 alcoholic beverages, indicating sufficient accuracy. Analyses of alcoholic beverages using this method were successful with benefits of simplicity, cheapness, and less energy consumption.
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Affiliation(s)
- Vanpaseuth Phouthavong
- Department of Chemistry, Faculty of Natural Sciences, National University of Laos, P.O. Box 7322, Vientiane, Laos
| | - Hayato Inoue
- Department of Environmental and Life Sciences, Toyohashi University of Technology, 1-1 Hibarigaoka Tempaku-cho, Toyohashi, Aichi 441-8580, Japan
| | - Kesiny Phomkeona
- Department of Chemistry, Faculty of Natural Sciences, National University of Laos, P.O. Box 7322, Vientiane, Laos
| | - Vanseng Chounlamany
- Department of Chemistry, Faculty of Natural Sciences, National University of Laos, P.O. Box 7322, Vientiane, Laos
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4
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Nawalohakul T, Charoenjiraroj P, Chantiwas R, Wilairat P, Praditweangkum W. A ninety-six well plate as headspaces with moist starch indicator paper as a cover for the determination of ascorbic acid by iodate oxidation and formation of volatile iodine. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2022; 14:741-749. [PMID: 35108716 DOI: 10.1039/d1ay02050a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
This work presents the use of a 96-well plate as headspaces for the determination of ascorbic acid in samples loaded in the 96-well plate. Ascorbic acid in the sample is oxidized to iodide by the addition of excess acidic iodate solution into the well. The iodide is further oxidized by the remaining iodate to molecular iodine. A single sheet of moist starch indicator paper is immediately placed over the 96-well plate after the addition of the iodate with the moisture forming a gas seal. The iodine gas in each well diffuses through the headspace to react with the starch paper producing circular areas of a colored starch-iodine complex. After 15 min the indicator paper is scanned, and the digital images of the complex are analyzed by using ImageJ software to obtain blue intensity values. The precision of the intensity values from 12 wells containing 20 μL of 2.84 mM standard ascorbic acid is <2% relative standard deviation. Optimal conditions for detection were investigated, including the starch concentration, the acidic iodate reagent, and the measurement time. The linear calibration range of ascorbic acid is 0.284-2.84 mM, based on the plot of concentration vs. -log(reflectance). The coefficient of determination (r2) is >0.998. Samples of fruit juice and dietary supplements were analyzed for their ascorbic acid contents. The results obtained from the headspace reflectance method are not statistically different from values obtained from the titration method using paired t-tests (α = 0.05).
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Affiliation(s)
- Thichaphat Nawalohakul
- Department of Chemistry, School of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand.
| | - Pannarat Charoenjiraroj
- Department of Chemistry, School of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand.
| | - Rattikan Chantiwas
- Department of Chemistry, Center of Excellence for Innovation in Chemistry, Faculty of Science, Mahidol University, Rama VI Rd, Bangkok 10400, Thailand
| | - Prapin Wilairat
- Analytical Sciences and National Doping Test Institute, Mahidol University, Rama VI Rd, Bangkok 10400, Thailand
| | - Wiboon Praditweangkum
- Department of Chemistry, School of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand.
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Ratanawimarnwong N, Ruckchang P, Yooram S, Songsrirote K, Uraisin K, Cerdà V. Development of a microfluidic membraneless vaporization flow system for trace analysis of arsenic. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2021; 13:202-211. [PMID: 33331839 DOI: 10.1039/d0ay01970d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
A new design of a membraneless vaporization (MBL-VP) unit coupled with a specific flow system is presented for the determination of arsenic at trace levels using a hydride generation process. The MBL-VP unit contains two concentric conical reservoirs, with the outer cone selected as the donor reservoir. The volume of the outer donor reservoir is thereby greater than the acceptor volume, necessary for holding sufficient sample and reagents for the generation of arsine gas by reaction between As(iii) and sodium borohydride under acidic conditions. The arsine gas diffuses into the narrow headspace and is absorbed by an aliquot of 150 μL of mercuric chloride acceptor solution. The resulting reaction produces hydronium ions which is monitored by the absorbance change at 530 nm of the methyl orange indicator added in the acceptor solution. To decrease the detection limit, the aspiration and removal of the donor plug, comprising the sample, borohydride and acid, into and out of the donor cone are repeated several times, while the acceptor solution is kept unchanged. As a result, analysis of arsenic was achieved in the range of 10 to 100 μg L-1 with a detection limit of 8 μg L-1. Application to surface water was investigated. Percent recoveries of spiked surface water samples were in the range of 94-110%. For comparison of total arsenic (As(iii) and As(v)), the results obtained from the developed method are not statistically different from the ICP-OES method.
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Affiliation(s)
- Nuanlaor Ratanawimarnwong
- Department of Chemistry, Faculty of Science, Srinakharinwirot University, Sukhumvit 23, Bangkok 10110, Thailand. and Flow Innovation-Research for Science and Technology Laboratories (Firstlabs), Thailand
| | - Patcharat Ruckchang
- Department of Chemistry, Faculty of Science, Srinakharinwirot University, Sukhumvit 23, Bangkok 10110, Thailand.
| | - Supattra Yooram
- Department of Chemistry, Faculty of Science, Srinakharinwirot University, Sukhumvit 23, Bangkok 10110, Thailand.
| | - Kriangsak Songsrirote
- Department of Chemistry, Faculty of Science, Srinakharinwirot University, Sukhumvit 23, Bangkok 10110, Thailand.
| | - Kanchana Uraisin
- Flow Innovation-Research for Science and Technology Laboratories (Firstlabs), Thailand and Department of Chemistry, Center of the Excellence for Innovation in Chemistry, Faculty of Science, Mahidol University, Bangkok 10400, Thailand
| | - Victor Cerdà
- Department of Chemistry, University of the Balearic Islands, 07122 Palma de Mallorca, Spain
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Lert-Itthiporn A, Srikritsadawong P, Choengchan N. Foldable paper-based analytical device for membraneless gas-separation and determination of iodate based on fluorescence quenching of gold nanoclusters. Talanta 2021; 221:121574. [PMID: 33076121 DOI: 10.1016/j.talanta.2020.121574] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 08/08/2020] [Accepted: 08/10/2020] [Indexed: 12/12/2022]
Abstract
A new design of a paper-based analytical device (PAD) for membraneless gas-separation with subsequent determination of iodate is presented. The rectangular PAD was invented as the folded pattern, where two circular reservoirs: the donor reservoir and the acceptor reservoir were situated in "a single paper" for convenient use. The hydrophobic barrier of each reservoir was easily fabricated by painting with a permanent marker. The PAD was demonstrated for the quantitative analysis of iodate, based on the fluorescence quenching of the bovine serum albumin-stabilized gold nanoclusters (BSA-AuNCs). The BSA-AuNCs were fast prepared by a microwave-assisted approach. The nanoclusters solution was applied into the acceptor reservoir, while the sample, iodide and sulfuric acid were sequentially aliquoted into the donor reservoir. After folding the PAD, the donor and the acceptor were mounted together via a two-sided mounting tape. The headspace between the two reservoirs allows membraneless gas-separation of free iodine from the donor to diffuse into the acceptor. Etching of gold core of the nanoclusters in the acceptor resulted in quenching of the red emission, was monitored by two methods, i.e. "fluorometric detection" (λex: 490 nm, λem: 630 nm) and "image capture" of the acceptor under the UV irradiation by a smart phone's camera. Two calibrations were plotted accordingly to their detections and good linearities (r2 ˃ 0.98) were observed from 0.005 to 0.1 mmol L-1 iodate. High accuracy (mean recovery: 95.1 (±4.6) %) and high precision (RSD < 3%) were obtained. The lower limits of detection were 0.005 mmol L-1 (with fluorometric detection) and 0.01 mmol L-1 (with image capture). The method was effectively applied for the measurement of iodate in iodized salts and fish sauces without prior sample pre-treatment.
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Affiliation(s)
- Aurachat Lert-Itthiporn
- Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs), Bangkok, Thailand; Department of Chemistry and the Applied Analytical Chemistry Research Unit, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok, 10520, Thailand
| | - Pongpichet Srikritsadawong
- Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs), Bangkok, Thailand; Department of Chemistry and the Applied Analytical Chemistry Research Unit, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok, 10520, Thailand
| | - Nathawut Choengchan
- Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs), Bangkok, Thailand; Department of Chemistry and the Applied Analytical Chemistry Research Unit, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok, 10520, Thailand.
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8
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Mantim T, Chaisiwamongkhol K, Uraisin K, Hauser PC, Wilairat P, Nacapricha D. Dual-Purpose Photometric-Conductivity Detector for Simultaneous and Sequential Measurements in Flow Analysis. Molecules 2020; 25:E2284. [PMID: 32414012 PMCID: PMC7287826 DOI: 10.3390/molecules25102284] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 04/27/2020] [Accepted: 05/07/2020] [Indexed: 01/29/2023] Open
Abstract
This work presents a new dual-purpose detector for photometric and conductivity measurements in flow-based analysis. The photometric detector is a paired emitter-detector diode (PEDD) device, whilst the conductivity detection employs a capacitively coupled contactless conductivity detector (C4D). The flow-through detection cell is a rectangular acrylic block (ca. 2 × 2 × 1.5 cm) with cylindrical channels in Z-configuration. For the PEDD detector, the LED light source and detector are installed inside the acrylic block. The two electrodes of the C4D are silver conducting ink painted on the PEEK inlet and outlet tubing of the Z-flow cell. The dual-purpose detector is coupled with a sequential injection analysis (SIA) system for simultaneous detection of the absorbance of the orange dye and conductivity of the dissolved oral rehydration salt powder. The detector was also used for sequential measurements of creatinine and the conductivity of human urine samples. The creatinine analysis is based on colorimetric detection of the Jaffé reaction using the PEDD detector, and the conductivity of the urine, as measured by the C4D detector, is expressed in millisiemens (mS cm-1).
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Affiliation(s)
- Thitirat Mantim
- Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs), Bangkok 10400, Thailand; (K.C.); (K.U.); (P.W.)
- Department of Chemistry, Faculty of Science, Srinakharinwirot University, Sukhumwit 23 Road, Bangkok 10110, Thailand
- Center of Excellence for Innovation in Chemistry and Department of Chemistry, Faculty of Science, Mahidol University, Rama 6 Road, Bangkok 10400, Thailand
| | - Korbua Chaisiwamongkhol
- Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs), Bangkok 10400, Thailand; (K.C.); (K.U.); (P.W.)
- School of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand
- Center of Chemical Innovation for Sustainability (CIS), Mae Fah Luang University, Chiang Rai 57100, Thailand
| | - Kanchana Uraisin
- Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs), Bangkok 10400, Thailand; (K.C.); (K.U.); (P.W.)
- Center of Excellence for Innovation in Chemistry and Department of Chemistry, Faculty of Science, Mahidol University, Rama 6 Road, Bangkok 10400, Thailand
| | - Peter C. Hauser
- Department of Chemistry, University of Basel, Klingelbergstrasse 80, 4056 Basel, Switzerland;
| | - Prapin Wilairat
- Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs), Bangkok 10400, Thailand; (K.C.); (K.U.); (P.W.)
- National Doping Control Centre, Mahidol University, Rama 6 Road, Bangkok 10400, Thailand
| | - Duangjai Nacapricha
- Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs), Bangkok 10400, Thailand; (K.C.); (K.U.); (P.W.)
- Center of Excellence for Innovation in Chemistry and Department of Chemistry, Faculty of Science, Mahidol University, Rama 6 Road, Bangkok 10400, Thailand
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9
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Choengchan N, Poontong B, Mathaweesansurn A, Maneerat N, Motomizu S, Ratanawimarnwong N, Nacapricha D. A "Dual-acceptor Channel" Membraneless Gas-diffusion Unit for Simultaneous Determination of Ethanol and Acetaldehyde in Liquors Using Reverse Flow Injection. ANAL SCI 2018; 34:169-175. [PMID: 29434102 DOI: 10.2116/analsci.34.169] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A new design of membraneless gas-diffusion unit with dual acceptor channels for separation, collection and simultaneous determination of two volatile analytes in liquid sample is presented. The unit is comprised of three parallel channels in a closed module. A sample is aspirated into the central channel and two kinds of reagents are introduced into the other two channels. Two analytes are isolated from the sample matrix by diffusion into head-space and absorbed into the specific reagents. Non-absorbed vapor is released by opening the programmable controlled lid. The unit was applied to liquors for measurement of ethanol and acetaldehyde using reverse flow injection. Dichromate and nitroprusside were exploited as reagents for colorimetric detection of ethanol and acetaldehyde, respectively. Good linearity ranges (r2 >0.99) with high precision (RSD <2%) and high accuracy (recovery: 90 - 105%) were achieved. The results were compared to the results by GC-FID and no significant difference was observed by paired t-test (95% confidence).
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Affiliation(s)
- Nathawut Choengchan
- Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs).,Applied Analytical Chemistry Research Unit, Department of Chemistry, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang
| | - Bangerdsuk Poontong
- Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs).,Applied Analytical Chemistry Research Unit, Department of Chemistry, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang
| | - Arjnarong Mathaweesansurn
- Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs).,Applied Analytical Chemistry Research Unit, Department of Chemistry, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang
| | - Noppadol Maneerat
- Department of Control Engineering, Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang
| | | | - Nuanlaor Ratanawimarnwong
- Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs).,Department of Chemistry, Faculty of Science, Srinakharinwirot University
| | - Duangjai Nacapricha
- Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs).,Department of Chemistry and Center of Excellent for Innovation in Chemistry, Faculty of Science, Mahidol University
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10
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Alahmad W, Pluangklang T, Mantim T, Cerdà V, Wilairat P, Ratanawimarnwong N, Nacapricha D. Development of flow systems incorporating membraneless vaporization units and flow-through contactless conductivity detector for determination of dissolved ammonium and sulfide in canal water. Talanta 2018; 177:34-40. [DOI: 10.1016/j.talanta.2017.09.037] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Revised: 09/12/2017] [Accepted: 09/13/2017] [Indexed: 11/30/2022]
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11
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Phansi P, Sumantakul S, Wongpakdee T, Fukana N, Ratanawimarnwong N, Sitanurak J, Nacapricha D. Membraneless Gas-Separation Microfluidic Paper-Based Analytical Devices for Direct Quantitation of Volatile and Nonvolatile Compounds. Anal Chem 2016; 88:8749-56. [PMID: 27464645 DOI: 10.1021/acs.analchem.6b02103] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
This work presents new chemical sensing devices called "membraneless gas-separation microfluidic paper-based analytical devices" (MBL-GS μPADs). MBL-GS μPADs were designed to make fabrication of the devices simple and user-friendly. MBL-GS μPADs offer direct quantitative analysis of volatile and nonvolatile compounds. Porous hydrophobic membrane is not needed for gas-separation, which makes fabrication of the device simple, rapid and low-cost. A MBL-GS μPAD consists of three layers: "donor layer", "spacer layer", and "acceptor layer". The donor and acceptor layers are made of filter paper with a printed pattern. The donor and acceptor layers are mounted together with a spacer layer in between. This spacer is a two-sided mounting tape, 0.8 mm thick, with a small disc cut out for the gas from the donor zone to diffuse to the acceptor zone. Photographic image of the color that is formed by the reagent in the acceptor layer is analyzed using the ImageJ program for quantitation. Proof of concept of the MBL-GS μPADs was demonstrated by analyzing standard solutions of ethanol, sulfide, and ammonium. Optimization of the MBL-GS μPADs was carried out for direct determination of ammonium in wastewaters and fertilizers to demonstrate the applicability of the system to real samples.
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Affiliation(s)
- Piyawan Phansi
- Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs), Mahidol University Rama 6 Road, Bangkok 10400, Thailand.,Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Mahidol University , Rama 6 Road, Bangkok 10400, Thailand
| | - Saichon Sumantakul
- Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs), Mahidol University Rama 6 Road, Bangkok 10400, Thailand.,Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Mahidol University , Rama 6 Road, Bangkok 10400, Thailand
| | - Thinnapong Wongpakdee
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Mahidol University , Rama 6 Road, Bangkok 10400, Thailand
| | - Nutnaree Fukana
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Mahidol University , Rama 6 Road, Bangkok 10400, Thailand
| | - Nuanlaor Ratanawimarnwong
- Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs), Mahidol University Rama 6 Road, Bangkok 10400, Thailand.,Department of Chemistry, Faculty of Science, Srinakharinwirot University , Sukhumvit 23, Bangkok 10110, Thailand
| | - Jirayu Sitanurak
- Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs), Mahidol University Rama 6 Road, Bangkok 10400, Thailand.,Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Mahidol University , Rama 6 Road, Bangkok 10400, Thailand
| | - Duangjai Nacapricha
- Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs), Mahidol University Rama 6 Road, Bangkok 10400, Thailand.,Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Mahidol University , Rama 6 Road, Bangkok 10400, Thailand
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12
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Jaikang P, Grudpan K, Kanyanee T. Conductometric determination of ammonium ion with a mobile drop. Talanta 2015; 132:884-8. [DOI: 10.1016/j.talanta.2014.10.046] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Revised: 10/19/2014] [Accepted: 10/20/2014] [Indexed: 11/17/2022]
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13
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New membraneless vaporization unit coupled with flow systems for analysis of ethanol. Anal Chim Acta 2013; 796:61-7. [PMID: 24016584 DOI: 10.1016/j.aca.2013.07.072] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2013] [Revised: 07/11/2013] [Accepted: 07/29/2013] [Indexed: 11/21/2022]
Abstract
This work presents the development of a new design for a membraneless vaporization (MBL-VP) unit, called dual chamber MBL-VP for measurement of volatile compounds. With this unit, exact volumes of sample and reagent are introduced into their respective cone-shaped chambers from the base of the cones. Diffusion of volatile analyte then takes place. After an appropriate time interval, the acceptor solution is withdrawn from the chamber into the detector flow-cell, while the sample solution is withdrawn to waste. Unlike the previous MBL-VP design, problems with overflow of solutions are eliminated by precise control of the input volume to be less than the volume of the chamber. The developed flow system with the dual chamber MBL-VP unit was applied to the determination of the ethanol content of various liquid samples, using the oxidation reaction between potassium dichromate and the diffused ethanol. In addition, in order to accelerate the gas diffusion process, the donor chamber was aerated. As the result, relatively short analysis time of 144 s was achieved for ethanol content in the range of 5-50% (v/v). The proposed method was successfully validated against a gas chromatographic method for 17 alcoholic samples. Percentage recovery was in the range of 96-109%.
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14
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Tian Y, Dasgupta PK, Mahon SB, Ma J, Brenner M, Wang JH, Boss GR. A disposable blood cyanide sensor. Anal Chim Acta 2013; 768:129-35. [PMID: 23473259 PMCID: PMC3596829 DOI: 10.1016/j.aca.2013.01.029] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Revised: 01/07/2013] [Accepted: 01/15/2013] [Indexed: 11/28/2022]
Abstract
Deaths due to smoke inhalation in fires are often due to poisoning by HCN. Rapid administration of antidotes can result in complete resuscitation of the patient but judicious dosing requires the knowledge of the level of cyanide exposure. Rapid sensitive means for blood cyanide quantitation are needed. Hydroxocyanocobinamide (OH(CN)Cbi) reacts with cyanide rapidly; this is accompanied by a large spectral change. The disposable device consists of a pair of nested petri dish bottoms and a single top that fits the outer bottom dish. The top cover has a diametrically strung porous polypropylene membrane tube filled with aqueous OH(CN)Cbi. One end of the tube terminates in an amber (583nm) light emitting diode; the other end in a photodiode via an acrylic optical fiber. An aliquot of the blood sample is put in the inner dish, the assembly covered and acid is added through a port in the cover. Evolved HCN diffuses into the OH(CN)Cbi solution and the absorbance in the long path porous membrane tube cell is measured within 160 s. The LOD was 0.047, 1.0, 0.15, 5.0 and 2.2 μM, respectively, for water (1 mL), bovine blood (100 μL, 1 mL), and rabbit blood (20 μL, 50 μL). RSDs were<10% in all cases and the linear range extended from 0.5 to 200 μM. The method was validated against a microdiffusion approach and applied to the measurement of cyanide in rabbit and human blood. The disposable device permits field measurement of blood cyanide in <4 min.
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Affiliation(s)
- Yong Tian
- Department of Chemistry and Biochemistry, University of Texas at Arlington, 700 Planetarium Place, Arlington, TX 76019-0065, USA
- Research Center for Analytical Sciences, Northeastern University, Box 332, Shenyang 110819, China
| | - Purnendu K. Dasgupta
- Department of Chemistry and Biochemistry, University of Texas at Arlington, 700 Planetarium Place, Arlington, TX 76019-0065, USA
| | - Sari B. Mahon
- Beckman Laser Institute, University of California, Irvine, Irvine, CA, 92612-1475, USA
| | - Jian Ma
- Department of Chemistry and Biochemistry, University of Texas at Arlington, 700 Planetarium Place, Arlington, TX 76019-0065, USA
| | - Matthew Brenner
- Beckman Laser Institute, University of California, Irvine, Irvine, CA, 92612-1475, USA
| | - Jian-Hua Wang
- Research Center for Analytical Sciences, Northeastern University, Box 332, Shenyang 110819, China
| | - Gerry R. Boss
- Department of Medicine, University of California, San Diego, La Jolla, CA 92093-0652, USA
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15
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Reagent-free analytical flow methods for the soft drink industry: Efforts for environmentally friendly chemical analysis. PURE APPL CHEM 2012. [DOI: 10.1351/pac-con-12-02-06] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The evolution of an entirely green analytical system for industrial quality control of carbonated drinks is described. The developed flow system is capable of providing analytical data of the dissolved CO2, sucrose, and color of a sample consecutively in real-time. The system has been carefully designed on the basis of “reagent-free”, meaning that no added chemicals are required for the analysis. The system first vaporizes CO2 from the soft drink in a gas–liquid separation chamber, with a channel for a flow of pure water as the CO2 acceptor. The dissolved CO2 alters the conductivity of the water stream, which is directly related to the concentration of CO2 in the soft drink. The sucrose content is measured based on the “schlieren effect”, the sample plug flows out of the vaporization chamber into a colorimeter with a near-infrared/light-emitting diode (NIR/LED) as light source. The schlieren effect arises at the boundary of pure water and soft drink with refraction of light in proportion to the sugar concentration. The system also measures the absorbance of the sample using an RGB-LED. The related principles and preliminary experiments as proof of concept are described as well as the construction of the flow system for this completely reagent-free analyzer. A simple flow injection system using the schlieren effect was also developed for rapid quantitative analysis of sugar in noncarbonated soft drinks.
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A membraneless gas-diffusion unit – multisyringe flow injection spectrophotometric method for ammonium determination in untreated environmental samples. Talanta 2011; 84:1244-52. [DOI: 10.1016/j.talanta.2010.12.052] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2010] [Revised: 12/07/2010] [Accepted: 12/25/2010] [Indexed: 11/20/2022]
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Sereenonchai K, Teerasong S, Chan-Eam S, Saetear P, Choengchan N, Uraisin K, Amornthammarong N, Motomizu S, Nacapricha D. A low-cost method for determination of calcium carbonate in cement by membraneless vaporization with capacitively coupled contactless conductivity detection. Talanta 2010; 81:1040-4. [DOI: 10.1016/j.talanta.2010.01.057] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2009] [Revised: 01/25/2010] [Accepted: 01/27/2010] [Indexed: 11/26/2022]
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Teerasong S, Chan-Eam S, Sereenonchai K, Amornthammarong N, Ratanawimarnwong N, Nacapricha D. A reagent-free SIA module for monitoring of sugar, color and dissolved CO2 content in soft drinks. Anal Chim Acta 2010; 668:47-53. [DOI: 10.1016/j.aca.2010.01.021] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2009] [Revised: 12/18/2009] [Accepted: 01/11/2010] [Indexed: 10/20/2022]
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Tian K, Dasgupta PK. A permeable membrane capacitance sensor for ionogenic gases. Anal Chim Acta 2009; 652:245-50. [DOI: 10.1016/j.aca.2009.04.028] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2009] [Revised: 04/10/2009] [Accepted: 04/16/2009] [Indexed: 10/20/2022]
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