Yamashita, Kouwa: search on Z-Library

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1

Recent development of chemical derivatization in LC–MS for biomedical approaches

Ohno, Ken-ichi, Yamashita, Kouwa

Journal:

Year:

2015

Language:

english

File:

PDF, 1.07 MB

english, 2015

2

Structures and Biomimetic Synthesis of Novel α-Pyrone Polyketides of an Endophytic Penicillium sp. in Catharanthus roseus

Asai, Teigo, Luo, Dan, Yamashita, Kouwa, Oshima, Yoshiteru

Journal:

Organic Letters

Year:

2013

Language:

english

File:

PDF, 535 KB

english, 2013

3

Measurement of plasma etoposide by radio-immunoassay

Kouwa Yamashita, Keiko Watanabe, Hideki Takayama, Masataka Ishibashi, Hiroshi Miyazaki

Journal:

Journal of Pharmaceutical and Biomedical Analysis

Year:

1987

Language:

english

File:

PDF, 589 KB

english, 1987

4

Benzophenones from an Endophytic Fungus, Graphiopsis chlorocephala , from Paeonia lactiflora Cultivated in the Presence of an NAD + -Dependent HDAC Inhibitor

Asai, Teigo, Otsuki, Sae, Sakurai, Hiroaki, Yamashita, Kouwa, Ozeki, Tomoji, Oshima, Yoshiteru

Journal:

Organic Letters

Year:

2013

Language:

english

File:

PDF, 686 KB

english, 2013

5

Structures and absolute configurations of short-branched fatty acid dimers from an endophytic fungus of Aloe arborescens

Asai, Teigo, Otsuki, Sae, Taniguchi, Tohru, Monde, Kenji, Yamashita, Kouwa, Sakurai, Hiroaki, Ozeki, Tomoji, Oshima, Yoshiteru

Journal:

Tetrahedron Letters

Year:

2013

Language:

english

File:

PDF, 539 KB

english, 2013

6

Use of a new silylating agent for separation of bile acids and cholesterol by selected ion monitoring with the computer controlled intensity matching technique

Hiroshi Miyazaki, Masataka Ishibashi, Kouwa Yamashita

Journal:

Biological Mass Spectrometry = Journal of Mass Spectrometry (Wiley)

Year:

1978

Language:

english

File:

PDF, 571 KB

english, 1978

7

Diethylhydrogensilyl-cyclic diethylsilylene derivatives in gas chromatography-mass spectrometry of prostanoids : III. Fα-prostaglandins and thromboxane B2 derivatives

Masataka Ishibashi, Keiko Watanabe, Kouwa Yamashita, Hiroshi Miyazaki, Stefan Krolik

Journal:

Journal of Chromatography A

Year:

1987

Language:

english

File:

PDF, 941 KB

english, 1987

8

Dimethylisopropylsilyl ether derivatives in gas chromatography mass spectrometry of prostaglandins and thromboxane B2

Hiroshi Miyazaki, Masataka Ishibashi, Kouwa Yamashita, Yuko Nishikawa, Makoto Katori

Journal:

Biological Mass Spectrometry = Journal of Mass Spectrometry (Wiley)

Year:

1981

Language:

english

File:

PDF, 617 KB

english, 1981

9

Microdetermination of prostaglandins and thromboxane B2 by capillary gas chromatography and negative ion chemical ionization mass spectrometry

Hiroshi Miyazaki, Masataka Ishibashi, Hideki Takayama, Kouwa Yamashita, Izumi Suwa, Makoto Katori

Journal:

Journal of Chromatography A

Year:

1984

Language:

english

File:

PDF, 593 KB

english, 1984

10

Aromatic polyketide glycosides from an entomopathogenic fungus, Cordyceps indigotica

Teigo Asai, Takashi Yamamoto, Yu-Ming Chung, Fang-Rong Chang, Yang-Chang Wu, Kouwa Yamashita, Yoshiteru Oshima

Journal:

Tetrahedron Letters

Year:

2012

Language:

english

File:

PDF, 461 KB

english, 2012

11

Microdetermination of prostaglandins and thromboxane B2 by gas chromatography using an electron-capture detector

Hiroshi Miyazaki, Masataka Ishibashi, Kouwa Yamashita, Izumi Ohguchi, Hisashi Saitoh, Hiroshi Kurono, Masao Shimono, Makoto Katori

Journal:

Journal of Chromatography A

Year:

1982

Language:

english

File:

PDF, 867 KB

english, 1982

12

High-performance liquid chromatographic determination of deoxyspergualin in dog plasma with ultraviolet detection

Rumiko Nakanuma, Keiko Watanabe, Kouwa Yamashita, Shigeru Mizuguchi, Yutaka Hashimoto, Teruya Nakamura, Hamao Umezawa

Journal:

Journal of Chromatography B: Biomedical Sciences and Applications

Year:

1990

Language:

english

File:

PDF, 293 KB

english, 1990

13

Probing the binding pocket of the active site of aromatase with 2-phenylaliphatic androsta-1,4-diene-3,17-dione steroids

Madoka Takahashi, Kouwa Yamashita, Mitsuteru Numazawa

Journal:

Year:

2010

Language:

english

File:

PDF, 586 KB

english, 2010

14

Use of novel picolinoyl derivatization for simultaneous quantification of six corticosteroids by liquid chromatography-electrospray ionization tandem mass spectrometry

Kouwa Yamashita, Madoka Takahashi, Satoshi Tsukamoto, Mitsuteru Numazawa, Mitsunobu Okuyama, Seijiro Honma

Journal:

Journal of Chromatography A

Year:

2007

Language:

english

File:

PDF, 735 KB

english, 2007

15

Mass spectrometric analysis of oxygenations in aromatization of androst-4-ene-3,6,17-trione, a suicide substrate of aromatase, by placental microsomes. Isotope effect and stereochemistry

Mitsuteru Numazawa, Madoka Takahashi, Masao Nagaoka, Wakako Handa, Kouwa Yamashita

Journal:

The Journal of Steroid Biochemistry and Molecular Biology

Year:

2007

Language:

english

File:

PDF, 417 KB

english, 2007

16

Mechanistic aspects of rearrangement of 16α-hydroxy-17-keto steroids to the 17β-hydroxy-16-keto isomers

Mitsuteru Numazawa, Masao Nagaoka, Hisao Matsuzaki, Kouwa Yamashita, Sachiko Komatsu, Yoshio Osawa

Journal:

Year:

2008

Language:

english

File:

PDF, 570 KB

english, 2008

17

18-Oxocortisol Measurement in Adrenal Vein Sampling as a Biomarker for Subclassifying Primary Aldosteronism

Nakamura, Yasuhiro, Satoh, Fumitoshi, Morimoto, Ryo, Kudo, Masataka, Takase, Kei, Gomez-Sanchez, Celso E., Honma, Seijiro, Okuyama, Mitsunobu, Yamashita, Kouwa, Rainey, William E., Sasano, Hironobu, I

Journal:

Journal of Clinical Endocrinology & Metabolism

Year:

2011

Language:

english

File:

PDF, 927 KB

english, 2011

18

Diethylhydrogensilyl cyclic diethylsilylene derivatives in gas chromatography-mass spectrometry of hydroxylated steroids. II. Pregnanes with a hydroxylated 17.BETA.-side-chain.

ISHIBASHI, MASATAKA, ITOH, MASAHIRO, YAMASHITA, KOUWA, MIYAZAKI, HIROSHI, NAKATA, HISAO

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1986

File:

PDF, 769 KB

1986

19

Gas chromatography—mass spectrometry of some prostanoids with new derivatizing agents : Application to the analysis of 13,14-dihydro-15-ketoprostaglandin F2α

Kouwa Yamashita, Keiko Watanabe, Masataka Ishibashi, Hiroshi Miyazaki, Kazushige Yokota, Kazumi Horie, Shozo Yamamoto

Journal:

Journal of Chromatography A

Year:

1987

Language:

english

File:

PDF, 799 KB

english, 1987

20

Highly sensitive determination of estrone and estradiol in human serum by liquid chromatography–electrospray ionization tandem mass spectrometry

Kouwa Yamashita, Mitsunobu Okuyama, Yoko Watanabe, Seijiro Honma, Sayuri Kobayashi, Mitsuteru Numazawa

Journal:

Year:

2007

Language:

english

File:

PDF, 303 KB

english, 2007

21

Simultaneous determination of tetrahydrocortisol, allotetrahydrocortisol and tetrahydrocortisone in human urine by liquid chromatography-electrospray ionization tandem mass spectrometry

Kouwa Yamashita, Risa Nakagawa, Mitsunobu Okuyama, Seijiro Honma, Madoka Takahashi, Mitsuteru Numazawa

Journal:

Year:

2008

Language:

english

File:

PDF, 801 KB

english, 2008

22

Studies on dimethyl-tert-butylsilyl ethers of steroid.

HOSODA, HIROSHI, YAMASHITA, KOUWA, SAGAE, HIROMITSU, NAMBARA, TOSHIO

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1975

File:

PDF, 695 KB

1975

23

Blockage of coordination with shift reagent by tert-butyldimethylsilylation in nuclear magnetic resonance spectroscopy and its applications to deuterium-labeled steroids.

HOSODA, HIROSHI, YAMASHITA, KOUWA, IKEGAWA, SHIGEO, NAMBARA, TOSHIO

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1977

File:

PDF, 976 KB

1977

24

Proton Affinitive Derivatization for Highly Sensitive Determination of Testosterone and Dihydrotestosterone in Saliva Samples by LC-ESI- MS/MS

OHNO, Ken-ichi, HASEGAWA, Tomomi, TAMURA, Tomomi, UTSUMI, Haruka, YAMASHITA, Kouwa

Journal:

Analytical Sciences

Year:

2018

Language:

english

File:

PDF, 664 KB

english, 2018

25

Studies on the Metabolic Fate of Flutamide. (1): Plasma Concentration after Single Administration and Protein Binding in Rats.

ASAKAWA, Noriko, KOYAMA, Michinori, HASHIMOTO, Yutaka, YAMASHITA, Kouwa

Journal:

Drug Metabolism and Pharmacokinetics

Year:

1995

File:

PDF, 3.11 MB

1995

26

Determination of deoxyspergualin by gas chromatography-selected-ion monitoring

Kouwa Yamashita, Keiko Watanabe, Rumiko Koga, Shigeru Mizuguchi, Yutaka Hashimoto, Teruya Nakamura, Hamao Umezawa

Journal:

Journal of Chromatography B: Biomedical Sciences and Applications

Year:

1988

Language:

english

File:

PDF, 676 KB

english, 1988

27

Enzyme immunoassay of thromboxane B2

Yoko Hayashi, Natsuo Ueda, Kazushige Yokota, Sumio Kawamura, Fumitaka Ogushi, Yoshiko Yamamoto, Shozo Yamamoto, Kanzen Nakamura, Kouwa Yamashita, Hiroshi Miyazaki, Kaneyoshi Kato, Shinji Terao

Journal:

Biochimica et Biophysica Acta (BBA) - Lipids and Lipid Metabolism

Year:

1983

Language:

english

File:

PDF, 771 KB

english, 1983

28

Studies on the Metabolic Fate of Flutamide. (2): Absorption, Distribution and Excretion after Single Oral Administration in Rats.

ASAKAWA, Noriko, KOYAMA, Michinori, HASHIMOTO, Yutaka, YAMASHITA, Kouwa, ESUMI, Yoshio, TAKAICHI, Matsuo, SEKI, Hideaki, HARADA, Tomoko, HONDA, Naoko

Journal:

Drug Metabolism and Pharmacokinetics

Year:

1995

File:

PDF, 4.14 MB

1995

29

Immunoaffinity purification of 11-dehydro-thromboxane B2 from human urine and plasma for quantitative analysis by radioimmunoassay

Yoko Hayashi, Fumiaki Shono, Shozo Yamamoto, Wataru Takasaki, Akihiko Nakagawa, Keiko Watanabe, Kouwa Yamashita, Hiroshi Miyazaki

Journal:

Analytical Biochemistry

Year:

1990

Language:

english

File:

PDF, 1.10 MB

english, 1990

30

A heterologous enzyme immunoassay of prostaglandin E2 using a stable enzyme-labeled hapten mimic

Fumiaki Shono, Kazushige Yokota, Kazumi Horie, Shozo Yamamoto, Kouwa Yamashita, Keiko Watanabe, Hiroshi Miyazaki

Journal:

Analytical Biochemistry

Year:

1988

Language:

english

File:

PDF, 664 KB

english, 1988

31

Aromatase inactivation by 2-substituted derivatives of the suicide substrate androsta-1,4-diene-3,17-dione

Madoka Takahashi, Wakako Handa, Hiromi Umeta, Saki Ishikawa, Kouwa Yamashita, Mitsuteru Numazawa

Journal:

The Journal of Steroid Biochemistry and Molecular Biology

Year:

2009

Language:

english

File:

PDF, 646 KB

english, 2009

32

Determination of testosterone concentrations in rat plasma using liquid chromatography–atmospheric pressure chemical ionization mass spectrometry combined with ethyl oxime and acetyl ester derivatization

Makoto Niwa, Noriko Watanabe, Hisashi Ochiai, Kouwa Yamashita

Journal:

Journal of Chromatography B

Year:

2005

Language:

english

File:

PDF, 196 KB

english, 2005

33

Analysis of bile acids and cholesterol by open tubular glass capillary-selected ion monitoring.

NISHIKAWA, YUKO, YAMASHITA, KOUWA, ISHIBASHI, MASATAKA, MIYAZAKI, HIROSHI

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1978

File:

PDF, 379 KB

1978

34

Use of silylating agents for the identification of hydroxylated steroids by gas chromatography and gas chromatography-mass spectrometry : Discrimination between phenolic and alcoholic hydroxyl groups

Hiroshi Miyazaki, Masataka Ishibashi, Masahiro Itoh, Kouwa Yamashita, Toshio Nambara

Journal:

Journal of Chromatography A

Year:

1977

Language:

english

File:

PDF, 505 KB

english, 1977

35

Microdetermination of 11-dehydrothromboxane B2 in human urine by gas chromatography selected-ion monitoring

Keiko Watanabe, Kouwa Yamashita, Masataka Ishibashi, Yoko Hayashi, Shozo Yamamoto, Hiroshi Miyazaki

Journal:

Journal of Chromatography A

Year:

1989

Language:

english

File:

PDF, 751 KB

english, 1989

36

Assay of plasma leupeptin using the reversible binding of leupeptin to bovine pancreatic trypsin

Kouwa Yamashita, Keiko Watanabe, Hideki Takayama, Shigeru Mizuguchi, Masataka Ishibashi, Hiroshi Miyazaki, Wataru Tanaka, Hamao Umezawa

Journal:

Analytical Biochemistry

Year:

1986

Language:

english

File:

PDF, 372 KB

english, 1986

37

Synthesis of 15.ALPHA.-hydroxylated dehydroepiandrosterone and androstenediol.

HOSODA, HIROSHI, YAMASHITA, KOUWA, CHINO, NORIKO, NAMBARA, TOSHIO

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1976

File:

PDF, 668 KB

1976

38

Microdetermination of Catechol Estrogens by Liquid Chromatography-Electrospray Ionization Tandem Mass Spectrometry Combined with Picolinyl Derivatization

YAMASHITA, Kouwa, KAWAHATA, Takanori, TAKAHASHI, Madoka, NUMAZAWA, Mitsuteru

Journal:

Journal of the Mass Spectrometry Society of Japan

Year:

2009

Language:

english

File:

PDF, 322 KB

english, 2009

39

Metabolic Fate of NKH477. (4). Metabolism after Intravenous Administration in Rats, Dogs and Human.

IRIE, Tsuyoshi, MATSUMOTO, Shin-ichi, EKI, Toshiko, YAMASHITA, Kouwa

Journal:

Drug Metabolism and Pharmacokinetics

Year:

1998

File:

PDF, 7.50 MB

1998

40

Fusaric Acid as a Novel Proton-Affinitive Derivatizing Reagent for Highly Sensitive Quantification of Hydroxysteroids by LC-ESI-MS/MS

Kouwa Yamashita, Keiko Yamazaki, Sachiko Komatsu, Mitsuteru Numazawa

Journal:

Journal of the American Society for Mass Spectrometry

Year:

2010

Language:

english

File:

PDF, 396 KB

english, 2010

41

Regiospecific and enantioselective metabolism of 8,9-epoxyeicosatrienoic acid by cyclooxygenase

Ji Y. Zhang, Chandra Prakash, Kouwa Yamashita, Ian A. Blair

Journal:

Biochemical and Biophysical Research Communications

Year:

1992

Language:

english

File:

PDF, 445 KB

english, 1992

42

Analytical chemistry for ADMET research: Recent advances and future directions in LC–MS/MS and omics approaches

Yoshinari, Kouichi, Yamashita, Kouwa

Journal:

Drug Metabolism and Pharmacokinetics

Year:

2016

Language:

english

File:

PDF, 156 KB

english, 2016

43

Analysis of hapten-bovine serum albumin and enzyme-antibo dy conjugatesby MALDI-TOFMS.

HASHIMOTO, Yutaka, YAMASHITA, Noriyuki, YAMASHITA, Kouwa, WILLIAMS, Tim

Journal:

Year:

1996

File:

PDF, 663 KB

1996

44

Dimethylisopropylsilyl ether derivatives in gas chromatography-mass spectrometry of some prostanoids : Application to the microdetermination of 15-ketoprostaglandin F2α formed by enzymatic conversion of PGF2α in vitro

Kouwa Yamashita, Keiko Watanabe, Masataka Ishibashi, Makoto Katori, Hiroshi Miyazaki

Journal:

Journal of Chromatography B: Biomedical Sciences and Applications

Year:

1988

Language:

english

File:

PDF, 754 KB

english, 1988

45

Synthesis of pyridine-carboxylate derivatives of hydroxysteroids for liquid chromatography–electrospray ionization-mass spectrometry

Kouwa Yamashita, Sayuri Kobayashi, Satoshi Tsukamoto, Mitsuteru Numazawa

Journal:

Year:

2007

Language:

english

File:

PDF, 351 KB

english, 2007

46

Aromatization of androstenedione and 16α-hydroxyandrostenedione in human placental microsomes: Kinetic analysis of inhibition by the 19-oxygenated and 3-deoxy analogs

Mitsuteru Numazawa, Yoko Watari, Sachiko Komatsu, Kouwa Yamashita, Masao Nagaoka

Journal:

Year:

2008

Language:

english

File:

PDF, 535 KB

english, 2008

47

Forskolin Derivatives. I. Synthesis, and Cardiovascular and Adenylate Cyclase-Stimulating Activities of Water-Soluble Forskolins.

TATEE, Tochiro, NARITA, Aya, NARITA, Kazuhisa, IZUMI, Giichi, TAKAHIRA, Takashi, SAKURAI, Masao, FUJITA, Akira, HOSONO, Makoto, YAMASHITA, Kouwa, ENOMOTO, Keiko, SHIOZAWA, Akira

Journal:

CHEMICAL & PHARMACEUTICAL BULLETIN

Year:

1996

File:

PDF, 785 KB

1996

48

Diethylsilyl ether and diethylsiliconide derivatives in gas chromatography mass spectrometry of hydroxylated steroids

Hiroshi Miyazaki, Masataka Ishibashi, Masahiro Itoh, Kouwa Yamashita

Journal:

Biological Mass Spectrometry = Journal of Mass Spectrometry (Wiley)

Year:

1984

Language:

english

File:

PDF, 489 KB

english, 1984

49

ChemInform Abstract: Tenuipyrone, a Novel Skeletal Polyketide from the Entomopathogenic Fungus, Isaria tenuipes, Cultivated in the Presence of Epigenetic Modifiers.

Teigo Asai, Yu-Ming Chung, Hiroaki Sakurai, Tomoji Ozeki, Fang-Rong Chang, Kouwa Yamashita, Yoshiteru Oshima

Journal:

Year:

2012

File:

PDF, 21 KB

2012

50

Enzyme immunoassay of 6-ketoprostaglandin F1α in a solid phase

Takeharu Tonai, Kazushige Yokota, Tomoko Yano, Yoko Hayashi, Shozo Yamamoto, Kouwa Yamashita, Hiroshi Miyazaki

Journal:

Biochimica et Biophysica Acta (BBA) - Lipids and Lipid Metabolism

Year:

1985

Language:

english

File:

PDF, 973 KB

english, 1985

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