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Macrino CDJ, Dos Santos NA, Conceição NDS, Baptista CSD, Neto AC, Romão W. Isolation and characterization of reference standard candidates for cocaine and benzoylecgonine obtained from illicit substances seized. J Forensic Sci 2024; 69:1025-1034. [PMID: 38520078 DOI: 10.1111/1556-4029.15502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Revised: 02/16/2024] [Accepted: 02/29/2024] [Indexed: 03/25/2024]
Abstract
The area of forensic chemistry has been growing and developing as a line of research due to the high demands of public safety that require increasingly reliable results due to their importance in criminalistics. In this way, the development of new technologies that help this area, whether in the identification and quantification of drugs or the fight against fraud, becomes promising. In this context, the present work explored the production of reference standards from the purification of cocaine/crack samples seized by the Civil Police of the State of Espírito Santo. Cocaine was purified using chromatographic techniques, and benzoylecgonine was synthesized from purified cocaine. All substances were characterized by ultra-high-resolution mass spectrometry and nuclear magnetic resonance. Homogeneity and stability studies were also performed with benzoylecgonine, and the results were evaluated using analysis of variance (ANOVA). Cocaine and benzoylecgonine showed purities of 98.37% and 96.34%, respectively. The homogeneity of the batch, short-term stability, and other parameters were also evaluated, which together indicate this proposal as promising in the development of reference standards for drugs of abuse from samples seized by the Brazilian forensic police.
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Affiliation(s)
- Clebson de Jesus Macrino
- Laboratório de Petroleômica e Química Forense, Departamento de Química, Universidade Federal do Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Nayara A Dos Santos
- Laboratório de Petroleômica e Química Forense, Departamento de Química, Universidade Federal do Espírito Santo, Vitória, Espírito Santo, Brazil
- Instituto Nacional de Ciência e Tecnologia Forense (INCT Forense), Vila Velha, Espírito Santo, Brazil
| | - Nathália Dos S Conceição
- Laboratório de Petroleômica e Química Forense, Departamento de Química, Universidade Federal do Espírito Santo, Vitória, Espírito Santo, Brazil
- Instituto Nacional de Ciência e Tecnologia Forense (INCT Forense), Vila Velha, Espírito Santo, Brazil
| | - Clara S D Baptista
- Laboratório de Petroleômica e Química Forense, Departamento de Química, Universidade Federal do Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Alvaro Cunha Neto
- Laboratório de Petroleômica e Química Forense, Departamento de Química, Universidade Federal do Espírito Santo, Vitória, Espírito Santo, Brazil
| | - Wanderson Romão
- Laboratório de Petroleômica e Química Forense, Departamento de Química, Universidade Federal do Espírito Santo, Vitória, Espírito Santo, Brazil
- Instituto Nacional de Ciência e Tecnologia Forense (INCT Forense), Vila Velha, Espírito Santo, Brazil
- Instituto Federal do Espírito Santo, Vila Velha, Espírito Santo, Brazil
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Otake T, Aoyagi Y, Yarita T. Assessment of the long-term stability of pesticide residues under freezing conditions in brown rice and soybean certified reference materials. JOURNAL OF PESTICIDE SCIENCE 2024; 49:46-51. [PMID: 38450090 PMCID: PMC10912925 DOI: 10.1584/jpestics.d23-047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Accepted: 10/16/2023] [Indexed: 03/08/2024]
Abstract
The objective of this study was to assess the long-term stability of pesticide residues in brown rice and soybean. The long-term stability of pesticide residues in brown rice and soybean was assessed for 5415 days (over 14 years) and 1801 days (about 5 years), respectively. The samples-certified reference materials (CRMs) 7504-a (brown rice) and 7509-a (soybean) -were prepared by freeze-pulverization. Two target pesticides (etofenprox and fenitrothion) were selected for brown rice and four (chlorpyrifos, diazinon, fenitrothion, and permethrin) for soybean. Our analytical results for long-term stability based on highly reliable isotope dilution mass spectrometry were in the range of expanded uncertainty (k=2) for the certified values of each CRM. The concentration showed a decreasing trend in none of the target pesticides when the samples were stored at temperatures between -20 °C and -30 °C, which indicated that the target pesticides were stable for the tested long terms.
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Affiliation(s)
- Takamitsu Otake
- National Metrology Institute of Japan (NMIJ) National Institute of Advanced Industrial Science and Technology (AIST)
| | - Yoshie Aoyagi
- National Metrology Institute of Japan (NMIJ) National Institute of Advanced Industrial Science and Technology (AIST)
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3
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Development of a mutton powder certified reference material for the analysis of ractopamine. J Food Compost Anal 2023. [DOI: 10.1016/j.jfca.2022.104935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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4
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Morales LV, Salinas AS, González IA, Holguin K, Sinuco DC, Díaz-Galiano FJ, Ahumada DA, Fernández-Alba AR. Development of Avocado Reference Material for Pesticide Residue Analysis. J AOAC Int 2022; 105:1051-1059. [DOI: 10.1093/jaoacint/qsac034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Revised: 02/17/2022] [Accepted: 02/24/2022] [Indexed: 11/13/2022]
Abstract
Abstract
Background
Pesticide quantitation in foods relies on the availability of matrix reference materials, which, however, are scarce because of the general instability of pesticides. In particular, no avocado reference material has been developed.
Objective
This research aimed to develop a reference material to support the determination of pesticide residues in avocado.
Method
Avocado was spiked with 11 selected pesticides at levels of 0.01–0.35 mg/kg. The production process included the assessment of between-unit heterogeneity, stability during dispatch, and best storage conditions according to ISO 17034. Reference values were estimated through an interlaboratory comparison study involving laboratories of demonstrated competence and adhering to ISO/IEC 17025. The corresponding expanded uncertainties were calculated as 4–19% in compliance with the Guide to the Expression of Uncertainty in Measurement.
Results
The reference material was sufficiently homogeneous and stable at 4°C during the entire study period (365 days) for most of the pesticides, and at 40°C during 10 days, but it was unstable at 50 and 60°C during 10 days. Four pesticides showed downward trends; however, this behavior was considered in the uncertainty budget. As this material complied with all requirements of proficiency testing, it was used in an interlaboratory proficiency test designed to investigate analytical performance and assist laboratories in improving the quality of measurement results.
Conclusions
The presented material can be used for the development of novel analytical methods or in-house reference materials and adds to the scarce supply of reference materials for the determination of pesticides in vegetable matrixes with high oil contents and intermediate water contents.
Highlights
A novel reference material has been developed for the reliable and accurate quantitation of multiple pesticides in avocado, allowing researchers to avoid the preparation of in-house reference materials for this purpose.
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Affiliation(s)
- Laura V Morales
- Instituto Nacional de Metrología de Colombia, Grupo de Investigación en Metrología Química y Bioanálisis , Avenida Carrera 50, No. 26-55 , 11132 Bogotá D.C., Colombia
- Universidad Nacional de Colombia, Grupo de Investigación en Metrología Química, LEA , Avenida Carrera 30 45-03 , 11132 Bogotá D.C., Colombia
| | - Andrés S Salinas
- Instituto Nacional de Metrología de Colombia, Grupo de Investigación en Metrología Química y Bioanálisis , Avenida Carrera 50, No. 26-55 , 11132 Bogotá D.C., Colombia
| | - Ivonne A González
- Instituto Nacional de Metrología de Colombia, Grupo de Investigación en Metrología Química y Bioanálisis , Avenida Carrera 50, No. 26-55 , 11132 Bogotá D.C., Colombia
| | - Katherin Holguin
- Instituto Nacional de Metrología de Colombia, Grupo de Investigación en Metrología Química y Bioanálisis , Avenida Carrera 50, No. 26-55 , 11132 Bogotá D.C., Colombia
| | - Diana C Sinuco
- Universidad Nacional de Colombia, Grupo de Investigación en Metrología Química, LEA , Avenida Carrera 30 45-03 , 11132 Bogotá D.C., Colombia
| | - Francisco J Díaz-Galiano
- European Union Reference Laboratory for Pesticide Residues in Fruits and Vegetables, University of Almería , 04120 Almería, Spain
| | - Diego A Ahumada
- Instituto Nacional de Metrología de Colombia, Grupo de Investigación en Metrología Química y Bioanálisis , Avenida Carrera 50, No. 26-55 , 11132 Bogotá D.C., Colombia
| | - Amadeo R Fernández-Alba
- European Union Reference Laboratory for Pesticide Residues in Fruits and Vegetables, University of Almería , 04120 Almería, Spain
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Global situation of reference materials to assure coffee, cocoa, and tea quality and safety. Trends Analyt Chem 2021. [DOI: 10.1016/j.trac.2021.116381] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Zhang M, Wen Y, Luo X, Wang X, Li J, Liu A, He L, Chen S, Ao X, Yang Y, Zou L, Liu S. Characterization, mechanism of cypermethrin biosorption by Saccharomyces cerevisiae strains YS81 and HP and removal of cypermethrin from apple and cucumber juices by inactive cells. JOURNAL OF HAZARDOUS MATERIALS 2021; 407:124350. [PMID: 33176957 DOI: 10.1016/j.jhazmat.2020.124350] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 10/15/2020] [Accepted: 10/19/2020] [Indexed: 06/11/2023]
Abstract
Cypermethrin is a common food contaminant and environmental pollutant that cause health threats to animals and humans. In this study, the characterization, mechanism, and application of cypermethrin removal by Saccharomyces cerevisiae were investigated. The binding of cypermethrin by the strains S. cerevisiae YS81 and HP was rapid and reached equilibrium at 2-8 h. The removal efficiency was dependent on incubation temperature and yeast concentration, whereas cypermethrin binding was not affected by pH. Heat and acid treatments enhanced the binding ability. Both strains survived in simulated digestion juices and removed cypermethrin effectively under simulated gastrointestinal conditions. Among the strains tested, the YS81 strain was the better candidate for cypermethrin concentration reduction. For the two S. cerevisiae strains, the biosorption kinetics and isotherm followed the pseudo-second-order model and Langmuir model well. The cell walls and the protoplasts were the main yeast cell components involved in cypermethrin binding. Fourier transformed infrared spectroscopy analysis revealed that -OH, -NH, -C-N, -COO-, and -C-O played a major role in binding cypermethrin. Inactive cells effectively removed cypermethrin from apple and cucumber juices and did not affect the physico-chemical properties. Therefore, S. cerevisiae strains YS81 and HP may be used for cypermethrin reduction in food or feed.
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Affiliation(s)
- Mengmei Zhang
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan 625014, People's Republic of China
| | - Yunling Wen
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan 625014, People's Republic of China
| | - Xiaoli Luo
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan 625014, People's Republic of China
| | - Xingjie Wang
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan 625014, People's Republic of China
| | - Jianlong Li
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan 625014, People's Republic of China
| | - Aiping Liu
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan 625014, People's Republic of China
| | - Li He
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan 625014, People's Republic of China
| | - Shujuan Chen
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan 625014, People's Republic of China
| | - Xiaolin Ao
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan 625014, People's Republic of China; Institute of Food Processing and Safety, Sichuan Agricultural University, Ya'an, Sichuan 625014, People's Republic of China
| | - Yong Yang
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan 625014, People's Republic of China; Institute of Food Processing and Safety, Sichuan Agricultural University, Ya'an, Sichuan 625014, People's Republic of China
| | - Likou Zou
- College of Resources, Sichuan Agricultural University, Chengdu, Sichuan 611130, People's Republic of China
| | - Shuliang Liu
- College of Food Science, Sichuan Agricultural University, Ya'an, Sichuan 625014, People's Republic of China; Institute of Food Processing and Safety, Sichuan Agricultural University, Ya'an, Sichuan 625014, People's Republic of China.
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Kim M, Park HJ, Bae ON, Baek SH. Development and uncertainty estimation of cryogenic homogenization and static headspace–gas chromatography–mass spectrometry method for the simultaneous determination of twelve toxic volatiles in disposable menstrual products. Microchem J 2020. [DOI: 10.1016/j.microc.2020.105291] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Gong N, Zhang B, Hu K, Gao Z, Du G, Lu Y. Development and Certification of Formononetin Reference Material for Quality Control of Functional Foods and Botanical Supplements. CURR ANAL CHEM 2019. [DOI: 10.2174/1573411014666180411152309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Background:
Formononetin is a common soy isoflavonoid that can be found abundantly in
many natural plants. Previous studies have shown that formononetin possesses a variety of activities
which can be applied for various medicinal purposes. Certified Reference Materials (CRMs) play a
fundamental role in the food, traditional medicine and dietary supplement fields, and can be used for
method validation, uncertainty estimation, as well as quality control.
Methods:
The purity of formononetin was determined by Differential Scanning Calorimetry (DSC),
Coulometric Titration (CT) and Mass Balance (MB) methods.
Results:
This paper reports the sample preparation methodology, homogeneity and stability studies,
value assignment, and uncertainty estimation of a new certified reference material of formononetin.
DSC, CT and MB methods proved to be sufficiently reliable and accurate for the certification purpose.
The purity of the formononetin CRM was therefore found to be 99.40% ± 0.24 % (k = 2) based on the
combined value assignments and the expanded uncertainty.
Conclusion:
This CRM will be a reliable standard for the validation of the analytical methods and for
quality assurance/quality control of formononetin and formononetin-related traditional herbs, food
products, dietary supplements and pharmaceutical formulations.
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Affiliation(s)
- Ningbo Gong
- Beijing Key Laboratory of Polymorphic Drugs, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Baoxi Zhang
- Beijing Key Laboratory of Polymorphic Drugs, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Kun Hu
- Beijing Key Laboratory of Polymorphic Drugs, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Zhaolin Gao
- Shandong Key laboratory of Polymorphic Drugs, Tengzhou, Shandong, 277500, China
| | - Guanhua Du
- Beijing Key Laboratory of Drug Targets and Screening Research, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Yang Lu
- Beijing Key Laboratory of Polymorphic Drugs, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
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Yang S, Yang D, Hu K, Zhou H, Guo Y, Du G, Lu Y. Certification of a new certified reference material of honokiol. Anal Bioanal Chem 2015; 407:5849-55. [PMID: 26038190 DOI: 10.1007/s00216-015-8769-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2015] [Revised: 05/03/2015] [Accepted: 05/06/2015] [Indexed: 11/29/2022]
Abstract
Honokiol is the most important active pharmaceutical ingredient in Magnolia officinalis, which is a famous traditional Chinese medicine and commonly used in clinical practice. In order to control the quality of honokiol and related pharmaceuticals, a new certified reference material (CRM) of honokiol was developed. The studies of sample preparation, homogeneity, stability, value assignment, and uncertainty evaluation were accomplished in this paper. Three different methods, including differential scanning calorimetry (DSC), mass balance method (MB), and coulometric titration (CT), were employed to determine the purity of honokiol. Specifically, the DSC and CT methods for purity determination of honokiol were established for the first time. The purity of honokiol CRM, after validation and evaluation, was found to be 99.3%, with an expanded uncertainty of 0.5% (k = 2).
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Affiliation(s)
- Shiying Yang
- Beijing Key Laboratory of Polymorphic Drugs, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China
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Yarita T, Aoyagi Y, Otake T. Evaluation of the impact of matrix effect on quantification of pesticides in foods by gas chromatography-mass spectrometry using isotope-labeled internal standards. J Chromatogr A 2015; 1396:109-16. [PMID: 25892640 DOI: 10.1016/j.chroma.2015.03.075] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Revised: 03/27/2015] [Accepted: 03/27/2015] [Indexed: 11/25/2022]
Abstract
The impact of the matrix effect in GC-MS quantification of pesticides in food using the corresponding isotope-labeled internal standards was evaluated. A spike-and-recovery study of nine target pesticides was first conducted using paste samples of corn, green soybean, carrot, and pumpkin. The observed analytical values using isotope-labeled internal standards were more accurate for most target pesticides than that obtained using the external calibration method, but were still biased from the spiked concentrations when a matrix-free calibration solution was used for calibration. The respective calibration curves for each target pesticide were also prepared using matrix-free calibration solutions and matrix-matched calibration solutions with blank soybean extract. The intensity ratio of the peaks of most target pesticides to that of the corresponding isotope-labeled internal standards was influenced by the presence of the matrix in the calibration solution; therefore, the observed slope varied. The ratio was also influenced by the type of injection method (splitless or on-column). These results indicated that matrix-matching of the calibration solution is required for very accurate quantification, even if isotope-labeled internal standards were used for calibration.
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Affiliation(s)
- Takashi Yarita
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 3, Umezono, Tsukuba, Ibaraki 305-8563, Japan.
| | - Yoshie Aoyagi
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 3, Umezono, Tsukuba, Ibaraki 305-8563, Japan
| | - Takamitsu Otake
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 3, Umezono, Tsukuba, Ibaraki 305-8563, Japan
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S1 certification of alpha-endosulfan, beta-endosulfan, and endosulfan sulfate in a candidate certified reference material (organochlorine pesticides in tea) by isotope dilution gas chromatography-mass spectrometry. Anal Bioanal Chem 2015; 407:3009-21. [DOI: 10.1007/s00216-015-8455-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Revised: 12/17/2014] [Accepted: 01/02/2015] [Indexed: 10/24/2022]
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Yarita T, Otake T, Aoyagi Y, Kuroda Y, Numata M, Iwata H, Watai M, Mitsuda H, Fujikawa T, Ota H. Development of soybean certified reference material for pesticide residue analysis. Talanta 2014; 119:255-61. [PMID: 24401412 DOI: 10.1016/j.talanta.2013.11.011] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2013] [Revised: 11/03/2013] [Accepted: 11/04/2013] [Indexed: 11/16/2022]
Abstract
A soybean certified reference material for pesticide residue analysis was developed by the National Metrology Institute of Japan. Three organophosphorus (diazinon, fenitrothion, chlorphyrifos) and one pyrethroid (permethrin) pesticides were sprayed on soybeans three times before harvest. These soybeans were freeze pulverized, homogenized, bottled, and sterilized by γ-irradiation to prepare the candidate material. Three isotope-dilution mass spectrometric methods that varied in terms of the solvents used for extraction of the target pesticides, the clean-up procedure, and the injection techniques and columns used for quantification via gas chromatography/mass spectrometry were applied to the characterization. Each target pesticide was quantified by two of these analytical methods, and the results were in good agreement. Homogeneity and stability assessment of the material demonstrated that the relative standard uncertainties due to the inhomogeneity and the instability for an expiry date of 55 months were 1.89-4.00% and 6.65-11.5%, respectively. The certified pesticide concentrations with expanded uncertainties (coverage factor k=2, approximate 95% confidence interval) calculated using the results of the characterization and the homogeneity and stability assessment were 21.7 ± 3.2 μg/kg for diazinon, 88 ± 21 μg/kg for fenitrothion, 11.1 ± 3.2 μg/kg for chlorpyrifos, and 20.1 ± 4.3 μg/kg for permethrin (as the sum of the constituent isomers).
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Affiliation(s)
- Takashi Yarita
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 3, Umezono, Tsukuba, Ibaraki 305-8563, Japan.
| | - Takamitsu Otake
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 3, Umezono, Tsukuba, Ibaraki 305-8563, Japan
| | - Yoshie Aoyagi
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 3, Umezono, Tsukuba, Ibaraki 305-8563, Japan
| | - Youko Kuroda
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 3, Umezono, Tsukuba, Ibaraki 305-8563, Japan
| | - Masahiko Numata
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 3, Umezono, Tsukuba, Ibaraki 305-8563, Japan
| | - Hitoshi Iwata
- Japan Food Research Laboratories, 6-11-10, Nagayama, Tama, Tokyo 206-0025, Japan
| | - Masatoshi Watai
- Japan Food Research Laboratories, 6-11-10, Nagayama, Tama, Tokyo 206-0025, Japan
| | - Hitoshi Mitsuda
- The General Environmental Technos Co., Ltd. (KANSO Technos), 3-1-1, Higashikuraji, Katano, Osaka 576-0061, Japan
| | - Takashi Fujikawa
- The General Environmental Technos Co., Ltd. (KANSO Technos), 3-1-1, Higashikuraji, Katano, Osaka 576-0061, Japan
| | - Hidekazu Ota
- The General Environmental Technos Co., Ltd. (KANSO Technos), 3-1-1, Higashikuraji, Katano, Osaka 576-0061, Japan
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A multinational joint project on the evaluation of residual pesticide analysis in tea in the Asia Pacific region. Food Res Int 2013. [DOI: 10.1016/j.foodres.2012.10.039] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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