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Date Y, Aota A, Sasaki K, Namiki Y, Matsumoto N, Watanabe Y, Ohmura N, Matsue T. Label-Free Impedimetric Immunoassay for Trace Levels of Polychlorinated Biphenyls in Insulating Oil. Anal Chem 2014; 86:2989-96. [DOI: 10.1021/ac4035289] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yasumoto Date
- Environmental
Science Research Laboratory, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko City, Chiba 270-1194, Japan
- Graduate
School of Environmental Studies, Tohoku University, 6-6-11, Aramaki, Aoba, Sendai 980-8579, Japan
| | - Arata Aota
- Environmental
Science Research Laboratory, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko City, Chiba 270-1194, Japan
| | - Kazuhiro Sasaki
- Environmental
Science Research Laboratory, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko City, Chiba 270-1194, Japan
| | - Yukie Namiki
- Abiko Office of
Electric Power Engineering Systems Co., Ltd., 1646 Abiko, Abiko City, Chiba 270-1194, Japan
| | - Norio Matsumoto
- Environmental
Science Research Laboratory, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko City, Chiba 270-1194, Japan
- Graduate
School of Environmental Studies, Tohoku University, 6-6-11, Aramaki, Aoba, Sendai 980-8579, Japan
| | - Yoshitomo Watanabe
- Environmental
Science Research Laboratory, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko City, Chiba 270-1194, Japan
- Graduate
School of Environmental Studies, Tohoku University, 6-6-11, Aramaki, Aoba, Sendai 980-8579, Japan
| | - Naoya Ohmura
- Environmental
Science Research Laboratory, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko City, Chiba 270-1194, Japan
| | - Tomokazu Matsue
- Graduate
School of Environmental Studies, Tohoku University, 6-6-11, Aramaki, Aoba, Sendai 980-8579, Japan
- Tohoku
University,
The World Premier International Research Center Initiative, Advanced
Institute for Material Research (WPI-AIMR), 2-1-1 Katahira, Aoba, Sendai 980-8577 Japan
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Aota A, Date Y, Terakado S, Ohmura N. Pretreatment method for immunoassay of polychlorinated biphenyls in transformer oil using multilayer capillary column and microfluidic liquid-liquid partitioning. ANAL SCI 2013; 29:393-9. [PMID: 23574664 DOI: 10.2116/analsci.29.393] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Polychlorinated biphenyls (PCBs) are persistent organic pollutants that are present in the insulating oil inside a large number of transformers. To aid in eliminating PCB-contaminated transformers, PCBs in oil need to be measured using a rapid and cost-effective analytical method. We previously reported a pretreatment method for the immunoassay of PCBs in oil using a large-scale multilayer column and a microchip with multiple microrecesses, which permitted concentrated solvent extraction. In this paper, we report on a more rapid and facile pretreatment method, without an evaporation process, by improving the column and the microchip. In a miniaturized column, the decomposition and separation of oil were completed in 2 min. PCBs can be eluted from the capillary column at concentrations seven-times higher than those from the previous column. The total volume of the microrecesses was increased by improving the microrecess structure, the enabling extraction of four-times the amount of PCBs achieved with the previous system. By interfacing the capillary column with the improved microchip, PCBs in the eluate from the column were extracted into dimethyl sulfoxide in microrecesses with high enrichment and without the need for evaporation. Pretreatment was completed within 20 min. The pretreated oil was analyzed using a flow-based kinetic exclusion immunoassay. The limit of detection of PCBs in oil was 0.15 mg kg(-1), which satisfies the criterion set in Japan of 0.5 mg kg(-1).
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Affiliation(s)
- Arata Aota
- Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry, Abiko, Chiba, Japan.
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Terakado S, Ohmura N, Glass TR. Optimization of a commercial biosensor for polychlorinated biphenyls and evaluation of its utility for screening. ANAL SCI 2012; 28:737-42. [PMID: 22878626 DOI: 10.2116/analsci.28.737] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
We previously described our systematic progress that eventually resulted in a commercially available immunoassay based biosensor (PCB biosensor) for detecting PCBs in oil. However, IC50 of the commercialized PCB biosensor was approximately 2 ppb for PCBs, and did not achieve the theoretical detection limit (TDL) which would represent an IC50 of approximately 0.5 ppb. In this study, we characterize the effects of the antibody concentration, flow volume and flow rate on the PCB biosensor's response. Using the optimum operating conditions, the PCB biosensor achieved the TDL and its performance as a screening test was improved. Working at the stringent maximum residue limit specified by Japanese law (0.5 ppm total PCBs), the optimized biosensor exhibited excellent performance (0% false negatives and 7% false positives) in the screening of 110 samples of used Japanese transformer oil. The general approach for optimization described here is expected to benefit immunoassay researchers attempting to achieve optimum performance.
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Affiliation(s)
- Shingo Terakado
- Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry, Abiko, Chiba, Japan.
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Aota A, Date Y, Terakado S, Sugiyama H, Ohmura N. Analysis of polychlorinated biphenyls in transformer oil by using liquid-liquid partitioning in a microfluidic device. Anal Chem 2011; 83:7834-40. [PMID: 21892819 DOI: 10.1021/ac2015867] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Polychlorinated biphenyls (PCBs) that are present in transformer oil are a common global problem because of their toxicity and environmental persistence. The development of a rapid, low-cost method for measurement of PCBs in oil has been a matter of priority because of the large number of PCB-contaminated transformers still in service. Although one of the rapid, low-cost methods involves an immunoassay, which uses multilayer column separation, hexane evaporation, dimethyl sulfoxide (DMSO) partitioning, antigen-antibody reaction, and a measurement system, there is a demand for more cost-effective and simpler procedures. In this paper, we report a DMSO partitioning method that utilizes a microfluidic device with microrecesses along the microchannel. In this method, PCBs are extracted and enriched into the DMSO confined in the microrecesses under the oil flow condition. The enrichment factor was estimated to be 2.69, which agreed well with the anticipated value. The half-maximal inhibitory concentration of PCBs in oil was found to be 0.38 mg/kg, which satisfies the much stricter criterion of 0.5 mg/kg in Japan. The developed method can realize the pretreatment of oil without the use of centrifugation for phase separation. Furthermore, the amount of expensive reagents required can be reduced considerably. Therefore, our method can serve as a powerful tool for achieving a simpler, low-cost procedure and an on-site analysis system.
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Affiliation(s)
- Arata Aota
- Biotechnology Sector, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko City, Chiba, 270-1194 Japan.
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Nozawa S, Kasama H, Suzuki T, Yasui A. Application of Improved Dumas Method to the Determination of Total Nitrogen in Soy Sauce. BUNSEKI KAGAKU 2007. [DOI: 10.2116/bunsekikagaku.56.179] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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OHMURA N, GLASS TR, SASAKI K, JOH T, TAEMI Y, YOKOBORI N, TERAKADO S. Development of Portable Immunoassay Instrument for Screening of PCBs in Transformer Oil. BUNSEKI KAGAKU 2006. [DOI: 10.2116/bunsekikagaku.55.341] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Naoya OHMURA
- Central Research Institute of Electric Power Industry, Environmental Science Research Laboratory
| | - Thomas R. GLASS
- Central Research Institute of Electric Power Industry, Environmental Science Research Laboratory
| | - Kazuhiro SASAKI
- Central Research Institute of Electric Power Industry, Environmental Science Research Laboratory
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OHMURA N, GLASS TR, SASAKI K, JOH T, ITOH Y. GC/ECD Peak Pattern Analysis with GPC Pretreatment for Determination of PCBs in Transformer Oil. BUNSEKI KAGAKU 2006. [DOI: 10.2116/bunsekikagaku.55.317] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Naoya OHMURA
- Central Research Institute of Electric Power Industry, Environmental Science Research Laboratory
| | - Thomas R. GLASS
- Central Research Institute of Electric Power Industry, Environmental Science Research Laboratory
| | - Kazuhiro SASAKI
- Central Research Institute of Electric Power Industry, Environmental Science Research Laboratory
| | | | - Yumiko ITOH
- Sumika Chemical Analysis Service, LTD., Ehime Laboratory
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OHMURA N, GLASS TR, SASAKI K, JOH T, TAEMI Y, IMANISHI K, TERAKADO S. Immunoassay Screening Method for Polychlorinated Biphenyls in Transformer Oil. BUNSEKI KAGAKU 2006. [DOI: 10.2116/bunsekikagaku.55.519] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Naoya OHMURA
- Central Research Institute of Electric Power Industry, Environmental Science Research Laboratory
| | - Thomas R. GLASS
- Central Research Institute of Electric Power Industry, Environmental Science Research Laboratory
| | - Kazuhiro SASAKI
- Central Research Institute of Electric Power Industry, Environmental Science Research Laboratory
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