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42 results on '"Konishi, Yoshimasa"'

3. Screening of antibiotic residues in pork meat in Ho Chi Minh City, Vietnam, using a microbiological test kit and liquid chromatography/tandem mass spectrometry

Author

Ngoc Do, Mai Hoang, Yamaguchi, Takahiro, Okihashi, Masahiro, Harada, Kazuo, Konishi, Yoshimasa, Uchida, Kotaro, Bui, Long Thi, Nguyen, Thinh Duc, Phan, Ha Bich, Bui, Huong Dang Thien, Nguyen, Phuc Do, Kajimura, Keiji, Kumeda, Yuko, Dang, Chinh Van, Hirata, Kazumasa, and Yamamoto, Yoshimasa

Published
2016
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12. Detection of antibiotics in chicken eggs obtained from supermarkets in Ho Chi Minh City, Vietnam

Author

Yamaguchi, Takahiro, primary, Okihashi, Masahiro, additional, Harada, Kazuo, additional, Konishi, Yoshimasa, additional, Uchida, Kotaro, additional, Hoang Ngoc Do, Mai, additional, Thi Bui, Long, additional, Nguyen, Thinh Duc, additional, Phan, Ha Bich, additional, Dang Thien Bui, Huong, additional, Nguyen, Phuc Do, additional, Kajimura, Keiji, additional, Kumeda, Yuko, additional, Van Dang, Chinh, additional, Hirata, Kazumasa, additional, and Yamamoto, Yoshimasa, additional

Published
2017
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14. Monitoring of Antibiotic Residues in Aquatic Products in Urban and Rural Areas of Vietnam

Author

Uchida, Kotaro, primary, Konishi, Yoshimasa, additional, Harada, Kazuo, additional, Okihashi, Masahiro, additional, Yamaguchi, Takahiro, additional, Do, Mai Hoang Ngoc, additional, Thi Bui, Long, additional, Duc Nguyen, Thinh, additional, Do Nguyen, Phuc, additional, Thi Khong, Diep, additional, Thi Tran, Hoa, additional, Nam Nguyen, Thang, additional, Viet Le, Ha, additional, Van Chau, Vien, additional, Thi Van Dao, Khanh, additional, Thi Ngoc Nguyen, Hue, additional, Kajimura, Keiji, additional, Kumeda, Yuko, additional, Tran Pham, Khanh, additional, Ngoc Pham, Khai, additional, Trong Bui, Chien, additional, Quang Vien, Mai, additional, Hoang Le, Ninh, additional, Van Dang, Chinh, additional, Hirata, Kazumasa, additional, and Yamamoto, Yoshimasa, additional

Published
2016
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15. Size Distribution of Dechloranes in Particulate Matter

Author

KAKIMOTO, Kensaku, primary, TOJO, Toshiki, additional, SAKIYAMA, Takanori, additional, NAGAYOSHI, Haruna, additional, KONISHI, Yoshimasa, additional, KAJIMURA, Keiji, additional, NAKANO, Takeshi, additional, HATA, Mitsuhiko, additional, FURUUCHI, Masami, additional, TANG, Ning, additional, HAYAKAWA, Kazuichi, additional, and TORIBA, Akira, additional

Published
2016
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19. Antibiotic Residue Monitoring Results for Pork, Chicken, and Beef Samples in Vietnam in 2012–2013

Author

Yamaguchi, Takahiro, primary, Okihashi, Masahiro, additional, Harada, Kazuo, additional, Konishi, Yoshimasa, additional, Uchida, Kotaro, additional, Do, Mai Hoang Ngoc, additional, Bui, Huong Dang Thien, additional, Nguyen, Thinh Duc, additional, Nguyen, Phuc Do, additional, Chau, Vien Van, additional, Dao, Khanh Thi Van, additional, Nguyen, Hue Thi Ngoc, additional, Kajimura, Keiji, additional, Kumeda, Yuko, additional, Bui, Chien Trong, additional, Vien, Mai Quang, additional, Le, Ninh Hoang, additional, Hirata, Kazumasa, additional, and Yamamoto, Yoshimasa, additional

Published
2015
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22. Trends in the enantiomeric composition of polychlorinated biphenyl atropisomers in human breast milk.

Author

Konishi, Yoshimasa, Kakimoto, Kensaku, Nagayoshi, Haruna, and Nakano, Takeshi

Subjects
MARKET basket analysis, POLYCHLORINATED biphenyls, ATROPISOMERS, PERSISTENT pollutants, ENANTIOMERS
Abstract

For the precise estimation of the risk to human health caused by persistent organic pollutants (POPs), it is important to discuss enantiomer fraction value (EF value) because it is reported that behaviors such as stability and toxicity of enantiomers are quite different in human body. Among POPs, polychlorinated biphenyl (PCB) is known as one of the most persistent compounds in human breast milk samples. The main exposure source of PCB for human body is mostly from food especially in seafood. The contamination of fish and shellfish has been a serious problem for the Japanese, who consume a large amount of fish in their diet. PCBs have 19 congeners which are chlorine-substituted in 3- or 4- ortho positions are known to have enantiomers. In this study, we analyzed PCB 183 (2,2′,3,4,4′,5′,6-hepta CB) in human breast milk and fish samples enantioselectively and revealed the time trends of the EF value. Though EF value of PCB 183 in fish samples sustained close to racemate (EF = 0.5) from 1982 to 2012, that in breast milk increased over time. This fact indicates that (+)-PCB-183 has greater bioaccumulation potential than (-)-PCB-183 in human body; therefore, the toxicity of (+)-PCB-183 should be emphasized. [ABSTRACT FROM AUTHOR]

Published
2016
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25. Dechlorane Plus and decabromodiphenyl ether in atmospheric particles of northeast Asian cities.

Author

Kakimoto, Kensaku, Nagayoshi, Haruna, Akutsu, Kazuhiko, Konishi, Yoshimasa, Kajimura, Keiji, Hayakawa, Kazuichi, and Toriba, Akira

Subjects
DECABROMOBIPHENYL ether, FIRE resistant polymers, BIOGEOCHEMICAL residence time, ATMOSPHERIC carbon dioxide analysis, WAVELENGTH measurement
Abstract

Atmospheric particles were collected in several cities in Japan (Sapporo, Sagamihara, Kanazawa, and Kitakyushu), Korea (Busan), and China (Beijing) using a high-volume air sampler equipped with a quartz fiber filter. The summer and winter samples were analyzed using gas chromatography-high-resolution mass spectrometry for Dechlorane Plus (DP). Decabromodiphenyl ether (BDE-209) was also analyzed for the samples from Kanazawa and Beijing. DP was detected in all samples. The mean total DP (ΣDP) concentration was highest (6.7 pg/m) and lowest (0.87 pg/m) in the winter samples from Sagamihara and Busan, respectively. The seasonal variation of DP concentrations varied by sampling site in this study. BDE-209 was detected in all the analyzed samples except for one of the Kanazawa winter samples. BDE-209 concentration was considerably higher in Beijing than in Kanazawa. Significant correlations were found between the concentrations of ΣDP and BDE-209 in the winter samples from Kanazawa and in both summer and winter samples from Beijing. This similarity in the atmospheric behavior of DP and BDE-209, especially in winter, is assumed to reflect a common end usage and release mechanism. [ABSTRACT FROM AUTHOR]

Published
2015
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38. Estimation of Daily Intake of Dietary Fiber in Japan According to the Model Menu Method and Market Basket Method

Author

SUMIMOTO, Tatsuo, primary, NISHIMUNE, Takahiro, additional, YAKUSHIJI, Tsumoru, additional, TAGUCHI, Shuzo, additional, KONISHI, Yoshimasa, additional, ICHIKAWA, Tomio, additional, KOJIMA, Saburo, additional, DOGUCHI, Masao, additional, KAWAMURA, Taro, additional, KAWAI, Makoto, additional, KAMIKI, Teruo, additional, TANAKA, Kazushige, additional, KAWABATA, Norihiko, additional, and KUNITA, Nobuharu, additional

Published
1989
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41. [Determination of melamine in Chinese-made processed food].

Author

Fujita M, Kakimoto K, Nagayoshi H, Konishi Y, Uchida K, Osakada M, Okihashi M, and Obana H

Subjects
China, Chromatography, Liquid methods, Food Analysis methods, Food Handling, Tandem Mass Spectrometry methods, Triazines analysis
Abstract

A method using liquid chromatograph coupled with tandem mass spectrometer (LC/MS/MS) was developed for the determination of melamine in processed food. After extraction with 50% acetonitrile and clean-up with PSA and SCX, the quantification limit of melamine in processed food was 0.5 microg/g. The recoveries and relative standard deviations were 113 to 115% and less than 5%, respectively. Therefore, we considered that the developed method offers high precision and sensitivity for the determination of melamine in processed food. When the method was applied to six suspected products, 0.8 to 37 microg/g of melamine was detected from four milk-rich products.

Published
2009
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42. [Congener-specific analysis of Pcbs in food samples by using GC/MS].

Author

Akutsu K, Kuwabara K, Konishi Y, Matsumoto H, Murakami Y, Tanaka Y, Matsuda R, and Hori S

Subjects
Food Analysis methods, Gas Chromatography-Mass Spectrometry methods, Polychlorinated Biphenyls analysis
Abstract

A GC/MS method for congener-specific analysis of polychlorinated biphenyls (PCBs) in food samples was evaluated. There was good agreement between total concentration of PCBs in fish samples (n = 16) measured by using the GC/MS method and the conventional GC-ECD method. The total diet study samples (fishery food, meat, egg, milk, and their products) collected from Osaka in 1982-2001 were analyzed by using the GC/MS method to estimate the temporal trend of daily intake of PCBs from food. The estimated daily intake of total PCBs (sum of tri- to heptaCBs) was in the range of 0.7-4.4 microg/person/day, far below the Japanese provisional acceptable daily intake (250 microg/50 kg-person/day). The dominant congener was 2,2',4,4',5,5'-hexachlorobiphenyl (#153), which accounted for 9-15% of total PCB. The ratio of lower chlorinated congeners decreased from the 1980's to post-2000. The results indicate that the PCB congener profile in foods has gradually changed.

Published
2005
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