1
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Li J, Huang L, Guo Y, Cupp-Sutton KA, Wu S. An automated spray-capillary platform for the microsampling and CE-MS analysis of picoliter- and nanoliter-volume samples. Anal Bioanal Chem 2023; 415:6961-6973. [PMID: 37581707 PMCID: PMC10843549 DOI: 10.1007/s00216-023-04870-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Revised: 07/01/2023] [Accepted: 07/04/2023] [Indexed: 08/16/2023]
Abstract
Capillary electrophoresis mass spectrometry (CE-MS) is an emerging analytical tool for microscale biological sample analysis that offers high separation resolution, low detection limit, and low sample consumption. We recently developed a novel microsampling device, "spray-capillary," for quantitative low-volume sample extraction (as low as 15 pL/s) and online CE-MS analysis. This platform can efficiently analyze picoliter samples (e.g., single cells) with minimal sample loss and no additional offline sample-handling steps. However, our original spray-capillary-based experiments required manual manipulation of the sample inlet for sample collection and separation, which is time consuming and requires proficiency in device handling. To optimize the performance of spray-capillary CE-MS analysis, we developed an automated platform for robust, high-throughput analysis of picoliter samples using a commercially available CE autosampler. Our results demonstrated high reproducibility among 50 continuous runs using the standard peptide angiotensin II (Ang II), with an RSD of 14.70% and 0.62% with respect to intensity and elution time, respectively. We also analyzed Ang II using varying injection times to evaluate the capability of the spray-capillary to perform quantitative sampling and found high linearity for peptide intensity with respect to injection time (R2 > 0.99). These results demonstrate the capability of the spray-capillary sampling platform for high-throughput quantitative analysis of low-volume, low-complexity samples using pressure elution (e.g., direct injection). To further evaluate and optimize the automated spray-capillary platform to analyze complex biological samples, we performed online CE-MS analysis on Escherichia coli lysate digest spiked with Ang II using varying injection times. We maintained high linearity of intensity with respect to injection time for Ang II and E. coli peptides (R2 > 0.97 in all cases). Furthermore, we observed good CE separation and high reproducibility between automated runs. Overall, we demonstrated that the automated spray-capillary CE-MS platform can efficiently and reproducibly sample picoliter and nanoliter biological samples for high-throughput proteomics analysis.
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Affiliation(s)
- Jiaxue Li
- Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Room 2210, Norman, OK, 73019, USA
| | - Lushuang Huang
- Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Room 2210, Norman, OK, 73019, USA
| | - Yanting Guo
- Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Room 2210, Norman, OK, 73019, USA
| | - Kellye A Cupp-Sutton
- Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Room 2210, Norman, OK, 73019, USA.
| | - Si Wu
- Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Room 2210, Norman, OK, 73019, USA.
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2
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Sun M, Xu D, Wang S, Uchiyama K. Inkjet-Based Dispersive Liquid–Liquid Microextraction Method Coupled with UHPLC–MS/MS for the Determination of Aflatoxins in Wheat. Anal Chem 2019; 91:3027-3034. [DOI: 10.1021/acs.analchem.8b05344] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Meng Sun
- School of Pharmacy, Health Science Center, Xi’an Jiaotong University, Xi’an 710061, China
| | - Dan Xu
- School of Pharmacy, Health Science Center, Xi’an Jiaotong University, Xi’an 710061, China
| | - Sicen Wang
- School of Pharmacy, Health Science Center, Xi’an Jiaotong University, Xi’an 710061, China
| | - Katsumi Uchiyama
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, Minamiohsawa, Hachioji, Tokyo 192-0397, Japan
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3
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Demling P, Westerwalbesloh C, Noack S, Wiechert W, Kohlheyer D. Quantitative measurements in single-cell analysis: towards scalability in microbial bioprocess development. Curr Opin Biotechnol 2018; 54:121-127. [DOI: 10.1016/j.copbio.2018.01.024] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Revised: 01/02/2018] [Accepted: 01/22/2018] [Indexed: 10/17/2022]
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4
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Direct sample injection from a syringe needle into a separation capillary. Anal Chim Acta 2018; 1042:133-140. [PMID: 30428980 DOI: 10.1016/j.aca.2018.07.026] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Revised: 07/05/2018] [Accepted: 07/10/2018] [Indexed: 11/22/2022]
Abstract
An automatic micro-injector was developed for electrophoretic analysis of a microlitre amount of clinical samples, enabling injection of the sample from a Hamilton syringe. The outlet of the syringe needle is located directly opposite the inlet of the separation capillary at a defined distance of the order of hundreds of μm in the injection space. During the injection, the background electrolyte is forced out by air from this space and a drop of the sample is forced out of the syringe by a micro-pump so that it is caught at the entrance to the capillary. From the drop the sample is injected into the capillary by applying a negative pressure pulse or simply by spontaneous injection. The injection space is then filled with background electrolyte, which washes away excess sample and separation is commenced. The injector was tested in electrophoretic separation of a model sample with equimolar concentrations of 100 μM NH4+, K+, Na+, Mg2+ and Li+ in a short capillary with total/effective length of 16.5/11.5 cm. The repeatability of the migration time and peak area expressed as the RSD value is 2% and 4%, respectively. The practical applicability of the injector was verified on the determination of the antiparasitic pentamidine in 10 μL of rat plasma. Electrophoretic separation of pentamidine was performed in 100 mM of acetic acid/NaOH at pH 4.55, the sample consumption per analysis is 125 nL, the separation time is 45 s and the attained LOQ using contactless conductivity detection is 8 μM.
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5
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Zhang W, Mao S, Yang J, Zeng H, Nakajima H, Kato S, Uchiyama K. The use of an inkjet injection technique in immunoassays by quantitative on-line electrophoretically mediated microanalysis. J Chromatogr A 2016; 1477:127-131. [DOI: 10.1016/j.chroma.2016.11.041] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Revised: 11/21/2016] [Accepted: 11/22/2016] [Indexed: 10/20/2022]
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6
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Zeng H, Katagiri D, Ogino T, Nakajima H, Kato S, Uchiyama K. Droplet Enhanced Fluorescence for Ultrasensitive Detection Using Inkjet. Anal Chem 2016; 88:6135-9. [DOI: 10.1021/acs.analchem.6b01566] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Hulie Zeng
- Department
of Applied Chemistry,
Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachioji, Tokyo 192-0397, Japan
| | - Daisuke Katagiri
- Department
of Applied Chemistry,
Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachioji, Tokyo 192-0397, Japan
| | - Taisuke Ogino
- Department
of Applied Chemistry,
Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachioji, Tokyo 192-0397, Japan
| | - Hizuru Nakajima
- Department
of Applied Chemistry,
Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachioji, Tokyo 192-0397, Japan
| | - Shungo Kato
- Department
of Applied Chemistry,
Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachioji, Tokyo 192-0397, Japan
| | - Katsumi Uchiyama
- Department
of Applied Chemistry,
Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachioji, Tokyo 192-0397, Japan
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7
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Opekar F, Nesměrák K, Tůma P. Electrokinetic injection of samples into a short electrophoretic capillary controlled by piezoelectric micropumps. Electrophoresis 2016; 37:595-600. [DOI: 10.1002/elps.201500464] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2015] [Revised: 11/19/2015] [Accepted: 11/19/2015] [Indexed: 11/09/2022]
Affiliation(s)
- František Opekar
- Department of Analytical Chemistry, Faculty of Science; Charles University in Prague; Prague Czech Republic
| | - Karel Nesměrák
- Department of Analytical Chemistry, Faculty of Science; Charles University in Prague; Prague Czech Republic
| | - Petr Tůma
- Institute of Biochemistry, Cell and Molecular Biology; Third Faculty of Medicine, Charles University in Prague; Prague Czech Republic
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8
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Affiliation(s)
- Rachel K Harstad
- University of Minnesota , Department of Chemistry, 207 Pleasant Street South East, Minneapolis, Minnesota 55455, United States
| | - Alexander C Johnson
- University of Minnesota , Department of Chemistry, 207 Pleasant Street South East, Minneapolis, Minnesota 55455, United States
| | - Megan M Weisenberger
- University of Minnesota , Department of Chemistry, 207 Pleasant Street South East, Minneapolis, Minnesota 55455, United States
| | - Michael T Bowser
- University of Minnesota , Department of Chemistry, 207 Pleasant Street South East, Minneapolis, Minnesota 55455, United States
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9
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Poinsot V, Ong-Meang V, Gavard P, Couderc F. Recent advances in amino acid analysis by capillary electromigration methods, 2013-2015. Electrophoresis 2015; 37:142-61. [DOI: 10.1002/elps.201500302] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Revised: 08/19/2015] [Accepted: 08/19/2015] [Indexed: 12/17/2022]
Affiliation(s)
- Véréna Poinsot
- Université Paul Sabatier, Université de Toulouse, Laboratoire des IMRCP; Toulouse Cedex France
| | - Varravaddheay Ong-Meang
- Université Paul Sabatier, Université de Toulouse, Laboratoire des IMRCP; Toulouse Cedex France
| | - Pierre Gavard
- Université Paul Sabatier, Université de Toulouse, Laboratoire des IMRCP; Toulouse Cedex France
| | - François Couderc
- Université Paul Sabatier, Université de Toulouse, Laboratoire des IMRCP; Toulouse Cedex France
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10
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Xu Y, Ling BZ, Zhu WJ, Yao D, Zhang L, Wang Y, Yan C. Development of fully automated quantitative capillary electrophoresis with high accuracy and repeatability. Biomed Chromatogr 2015; 30:390-5. [DOI: 10.1002/bmc.3560] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Revised: 06/22/2015] [Accepted: 07/06/2015] [Indexed: 11/05/2022]
Affiliation(s)
- Yuan Xu
- School of Pharmacy; Shanghai Jiao Tong University; Shanghai 200240 China
| | - Bang-zan Ling
- School of Pharmacy; Shanghai Jiao Tong University; Shanghai 200240 China
| | - Wen-jun Zhu
- School of Pharmacy; Shanghai Jiao Tong University; Shanghai 200240 China
- Unimicro (Shanghai) Technologies; Pudong Shanghai 201203 China
| | - Dong Yao
- Unimicro (Shanghai) Technologies; Pudong Shanghai 201203 China
| | - Lin Zhang
- School of Pharmacy; Shanghai Jiao Tong University; Shanghai 200240 China
- Unimicro (Shanghai) Technologies; Pudong Shanghai 201203 China
| | - Yan Wang
- School of Pharmacy; Shanghai Jiao Tong University; Shanghai 200240 China
| | - Chao Yan
- School of Pharmacy; Shanghai Jiao Tong University; Shanghai 200240 China
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11
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Rang Y, Zeng H, Nakajima H, Kato S, Uchiyama K. Quantitative on-line concentration for capillary electrophoresis with inkjet sample introduction technique. J Sep Sci 2015; 38:2722-8. [DOI: 10.1002/jssc.201500201] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Revised: 05/06/2015] [Accepted: 05/07/2015] [Indexed: 11/12/2022]
Affiliation(s)
- Ying Rang
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences; Tokyo Metropolitan University; Minamiohsawa, Hachioji Tokyo Japan
| | - Hulie Zeng
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences; Tokyo Metropolitan University; Minamiohsawa, Hachioji Tokyo Japan
| | - Hizuru Nakajima
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences; Tokyo Metropolitan University; Minamiohsawa, Hachioji Tokyo Japan
| | - Shungo Kato
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences; Tokyo Metropolitan University; Minamiohsawa, Hachioji Tokyo Japan
| | - Katsumi Uchiyama
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences; Tokyo Metropolitan University; Minamiohsawa, Hachioji Tokyo Japan
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12
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Tian M, Wang Y, Mohamed AC, Guo L, Yang L. Enhancing separation in short-capillary electrophoresis via pressure-driven backflow. Electrophoresis 2015; 36:1549-54. [DOI: 10.1002/elps.201500013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Revised: 03/05/2015] [Accepted: 03/24/2015] [Indexed: 11/06/2022]
Affiliation(s)
- Miaomiao Tian
- Faculty of Chemistry; Northeast Normal University; ChangChun Jilin P. R. China
| | - Yujia Wang
- Faculty of Chemistry; Northeast Normal University; ChangChun Jilin P. R. China
| | | | - Liping Guo
- Faculty of Chemistry; Northeast Normal University; ChangChun Jilin P. R. China
| | - Li Yang
- Faculty of Chemistry; Northeast Normal University; ChangChun Jilin P. R. China
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13
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Chen F, Rang Y, Weng Y, Lin L, Zeng H, Nakajim H, Lin JM, Uchiyama K. Drop-by-drop chemical reaction and sample introduction for capillary electrophoresis. Analyst 2015; 140:3953-9. [PMID: 25728632 DOI: 10.1039/c5an00040h] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
In this paper, we report a novel sample introduction and chemical reaction strategy by drop-by-drop inkjet injection for an electrophoretically mediated microanalysis (EMMA). This method makes it possible to achieve an on-line introduction of reactant solutions by alternately ejecting small plugs, with an overlapping region of the plugs for mixing the reactants by electrophoresis, supporting chemical reactions, followed by electrophoretic separation of the final compounds. As a proof-of-concept of the method, the EMMA of an inkjetted mixture of 4-fluoro-7-nitrobenzofurazan (NBD-F) and amino acids was carried out as a model chemical reaction. The product NBD-amino acids were quantified by detection with laser induced fluorescence. The optimal conditions for the procedure were: inkjet driving voltage: +40-44 V; pulse width: 20-24 μs; drop-by-drop injection of reactant solutions: alternately 2 drops × 25 times for the amino acid solution and the NBD-F solution; zone overlapping voltage and time: 3 kV and 2 s; incubation time after overlapping: 5 min; separation voltage: 18 kV. Under the optimized conditions, a significant enhancement in sensitivity and a sensitive quantitative analysis were realized. The results obtained were comparable with those using the off-line labeling method. This method is rapid, cost-effective, and readily automated for EMMA.
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Affiliation(s)
- Fengming Chen
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo, Metropolitan University, Minamiohsawa, Hachioji, Tokyo 192-0397, Japan.
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14
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Yang J, Katagiri D, Mao S, Zeng H, Nakajima H, Uchiyama K. Generation of controlled monodisperse porous polymer particles by dipped inkjet injection. RSC Adv 2015. [DOI: 10.1039/c4ra13275k] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
A piezoelectric drop-on-demand (DOD) inkjet microchip with its nozzle immersed in organic phase was used to generate monodisperse porous polymer particles.
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Affiliation(s)
- Jianmin Yang
- Department of Applied Chemistry
- Graduate School of Urban Environmental Sciences
- Tokyo Metropolitan University
- Hachioji
- Japan
| | - Daisuke Katagiri
- Department of Applied Chemistry
- Graduate School of Urban Environmental Sciences
- Tokyo Metropolitan University
- Hachioji
- Japan
| | - Sifeng Mao
- Department of Applied Chemistry
- Graduate School of Urban Environmental Sciences
- Tokyo Metropolitan University
- Hachioji
- Japan
| | - Hulie Zeng
- Department of Applied Chemistry
- Graduate School of Urban Environmental Sciences
- Tokyo Metropolitan University
- Hachioji
- Japan
| | - Hizuru Nakajima
- Department of Applied Chemistry
- Graduate School of Urban Environmental Sciences
- Tokyo Metropolitan University
- Hachioji
- Japan
| | - Katsumi Uchiyama
- Department of Applied Chemistry
- Graduate School of Urban Environmental Sciences
- Tokyo Metropolitan University
- Hachioji
- Japan
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15
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Xue S, Zeng H, Yang J, Nakajima H, Uchiyama K. A compact immunoassay platform based on a multicapillary glass plate. SENSORS 2014; 14:9132-44. [PMID: 24859022 PMCID: PMC4063063 DOI: 10.3390/s140509132] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/15/2014] [Revised: 05/15/2014] [Accepted: 05/20/2014] [Indexed: 01/14/2023]
Abstract
A highly sensitive, rapid immunoassay performed in the multi-channels of a micro-well array consisting of a multicapillary glass plate (MCP) and a polydimethylsiloxane (PDMS) slide is described. The micro-dimensions and large surface area of the MCP permitted the diffusion distance to be decreased and the reaction efficiency to be increased. To confirm the concept of the method, human immunoglobulin A (h-IgA) was measured using both the proposed immunoassay system and the traditional 96-well plate method. The proposed method resulted in a 1/5-fold decrease of immunoassay time, and a 1/56-fold cut in reagent consumption with a 0.05 ng/mL of limit of detection (LOD) for IgA. The method was also applied to saliva samples obtained from healthy volunteers. The results correlated well to those obtained by the 96-well plate method. The method has the potential for use in disease diagnostic or on-site immunoassays.
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Affiliation(s)
- Shuhua Xue
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachioji, Tokyo 192-0397, Japan.
| | - Hulie Zeng
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachioji, Tokyo 192-0397, Japan.
| | - Jianmin Yang
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachioji, Tokyo 192-0397, Japan.
| | - Hizuru Nakajima
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachioji, Tokyo 192-0397, Japan.
| | - Katsumi Uchiyama
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachioji, Tokyo 192-0397, Japan.
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16
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Poinsot V, Ong-Meang V, Gavard P, Couderc F. Recent advances in amino acid analysis by capillary electromigration methods, 2011-2013. Electrophoresis 2013; 35:50-68. [DOI: 10.1002/elps.201300306] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Revised: 09/11/2013] [Accepted: 09/11/2013] [Indexed: 12/28/2022]
Affiliation(s)
- Véréna Poinsot
- Laboratoire des IMRCP; Université Paul Sabatier; Toulouse France
| | | | - Pierre Gavard
- Laboratoire des IMRCP; Université Paul Sabatier; Toulouse France
| | - François Couderc
- Laboratoire des IMRCP; Université Paul Sabatier; Toulouse France
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17
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Chen F, Mao S, Zeng H, Xue S, Yang J, Nakajima H, Lin JM, Uchiyama K. Inkjet Nanoinjection for High-Thoughput Chemiluminescence Immunoassay on Multicapillary Glass Plate. Anal Chem 2013; 85:7413-8. [DOI: 10.1021/ac4013336] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Fengming Chen
- Department of Applied Chemistry,
Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, Minamiohsawa, Hachioji, Tokyo
192-0397, Japan
| | - Sifeng Mao
- Beijing
Key Laboratory of Microanalytical
Methods and Instrumentation, Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Hulie Zeng
- Department of Applied Chemistry,
Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, Minamiohsawa, Hachioji, Tokyo
192-0397, Japan
| | - Shuhua Xue
- Department of Applied Chemistry,
Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, Minamiohsawa, Hachioji, Tokyo
192-0397, Japan
| | - Jianmin Yang
- Department of Applied Chemistry,
Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, Minamiohsawa, Hachioji, Tokyo
192-0397, Japan
| | - Hizuru Nakajima
- Department of Applied Chemistry,
Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, Minamiohsawa, Hachioji, Tokyo
192-0397, Japan
| | - Jin-Ming Lin
- Beijing
Key Laboratory of Microanalytical
Methods and Instrumentation, Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Katsumi Uchiyama
- Department of Applied Chemistry,
Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, Minamiohsawa, Hachioji, Tokyo
192-0397, Japan
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18
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Chen F, Zhang Y, Nakagawa Y, Zeng H, Luo C, Nakajima H, Uchiyama K, Lin JM. A piezoelectric drop-on-demand generator for accurate samples in capillary electrophoresis. Talanta 2013; 107:111-7. [PMID: 23598200 DOI: 10.1016/j.talanta.2012.12.058] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2012] [Revised: 12/30/2012] [Accepted: 12/31/2012] [Indexed: 11/17/2022]
Abstract
In this work, we propose a piezoelectric droplet generator for injection of well-defined amounts of sample in capillary electrophoresis. We demonstrate stable, precise and drop-on-demand droplet formation for various solutions, with precise control of waveform driving piezoelectric crystal inside the ink-jet head. By tuning the waveform, we can also manipulate the droplet size and delivery frequency. This injector was used in sampling for capillary electrophoresis. As a state-of-the-art application, the analysis of theobromine, caffeine and theophiline using micellar electrokinetic chromatography was developed. The volume of sample (single droplet) analyzed in this experiment was 179 pL (RSD=1.2%, n=10). The detection limits for caffeine, theobromine, and theophiline are 0.02, 0.08 and 0.06 mM L(-1), respectively. Compared with conventional methods, the combination of picoliter droplet dispenser with capillary electrophoresis allows precise and accurate sampling, as well as for reduced sample consumption, which will prove to be an efficient tool in quantitative separation and analysis.
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Affiliation(s)
- Fengming Chen
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, Minamiohsawa, Hachioji, Tokyo 192-0397, Japan
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