Zobrazeno 1 - 10
of 30
pro vyhledávání: '"John F. Fitzloff"'
Autor:
Cuiying Ma, Hongjie Zhang, John F. Fitzloff, Harry H. S. Fong, Richard B. van Breemen, Xudong Xu, Wenkui Li
Publikováno v:
Chemical and Pharmaceutical Bulletin. 55:455-458
Two new flavonoid glycosides, 5-hydroxy-7,8-dimethoxy (2R)-flavanone-5-O-beta-D-glucopyranoside (1) and 5-hydroxy-7,8,2',5'-tetramethoxy-flavone-5-O-beta-D-glucopyranoside (2), and a new diterpenoid, andrographic acid (3), along with andrographidine
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6fe375afa596d2a86da9de3289b5c48e
https://doi.org/10.1248/cpb.55.455
https://doi.org/10.1248/cpb.55.455
Publikováno v:
Journal of Liquid Chromatography & Related Technologies. 27:2507-2529
An RP‐HPLC method with photodiode array detection and electrospray ionization mass spectrometry was established for the determination of major caffeic acid derivatives (caftaric acid, chlorogenic acid, cynarin, and cichoric acid) in commercial Echi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::80b101278152c3e7e00adb4b5453d03e
https://doi.org/10.1081/jlc-200028369
https://doi.org/10.1081/jlc-200028369
Autor:
Wenkui Li, John F. Fitzloff, Cindy K. Angerhofer, Daniel S. Fabricant, Shao-Nong Chen, Harry H. S. Fong, Norman R. Farnsworth
Publikováno v:
Analytica Chimica Acta. 471:61-75
A validated and reproducible high-performance liquid chromatography (HPLC) method with in-line evaporative light scattering and photodiode array detection was developed for the analysis of major constituents in Black Cohosh (Cimicifuga racemosa L.).
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e6ddb8cb2a2bb6fb106041775e210421
https://doi.org/10.1016/s0003-2670(02)00776-6
https://doi.org/10.1016/s0003-2670(02)00776-6
Autor:
Wenkui Li, John F. Fitzloff
Publikováno v:
Journal of Liquid Chromatography & Related Technologies. 25:2485-2500
A total of 21 ginseng products, including Asian ginseng (Panax ginseng) and North American ginseng (Panax quinquefolius) in the form of powdered roots, capsules, liquid extracts, caplets, tablets, and softgels, etc., were analyzed for ginsenoside con
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6d4789bb6c2df9571ec155a4acd8c613
https://doi.org/10.1081/jlc-120014269
https://doi.org/10.1081/jlc-120014269
Autor:
Wenkui Li, John F. Fitzloff
Publikováno v:
Journal of Liquid Chromatography & Related Technologies. 25:2501-2514
Ginkgo biloba products are one of the top ten botanical dietary supplements in the USA. The active constituents include flavonoids and terpene lactones (ginkgolides and bilobalide). Ginkgo flavonoids have been associated with reduced lipid peroxidati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fb5e82e3c882dd65aba54e2237bb44e1
https://doi.org/10.1081/jlc-120014270
https://doi.org/10.1081/jlc-120014270
Autor:
John F. Fitzloff, Wenkui Li
Publikováno v:
Journal of Liquid Chromatography & Related Technologies. 25:1335-1343
A reverse-phase high performance liquid chromatographic method is developed for the determination of andrographolide, a characteristic diterpene lactone in commercial Andrographis (Andrographis paniculata) products. Samples are analyzed by means of a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8865ed7efd3bfddcbdc80ec53219f800
https://doi.org/10.1081/jlc-120004750
https://doi.org/10.1081/jlc-120004750
Publikováno v:
Journal of Liquid Chromatography & Related Technologies. 25:397-407
An HPLC-UV method with gradient elution for the quantification of catechins [(+)-catechin, (−)-epicatechin and (−)-epicatechin gallate] in grape seed extract was developed. The presence of monomers, dimers, and/or trimers of catechin were assayed
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::41ec23bfb6b59282fd6220abbab5e5e3
https://doi.org/10.1081/jlc-120008754
https://doi.org/10.1081/jlc-120008754
Autor:
Wenkui Li, John F. Fitzloff
Publikováno v:
Journal of Liquid Chromatography & Related Technologies. 25:17-27
A high performance liquid chromatography-evaporative light scattering detection (HPLC-ELSD) method was developed to identify Asian ginseng (Panax ginseng C. A. Meyer) and North American ginseng (P. quinquefolius L.), and their products. The method is
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::58e8a0ca965184cf833de34c510af7bf
https://doi.org/10.1081/jlc-100108536
https://doi.org/10.1081/jlc-100108536
Autor:
John F. Fitzloff, Wenkui Li
Publikováno v:
Journal of Liquid Chromatography & Related Technologies. 25:29-41
In-line connected ultraviolet (UV) and evaporative light scattering (ELS) detection were compared in the reversed-phase high-performance liquid chromatographic (HPLC) analysis of ginsenosides in ginseng roots. Similar to all the QA/QC literature on g
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9222d4d866a6101e5208d70865eec0a6
https://doi.org/10.1081/jlc-100108537
https://doi.org/10.1081/jlc-100108537
Autor:
Wenkui Li, John F. Fitzloff
Publikováno v:
Journal of Chromatography B: Biomedical Sciences and Applications. 765:99-105
An RP-HPLC method with photodiode array detection was established for the determination of major constituents (rutin, hyperoside, isoquercitrin, quercitrin, quercetin, pseudohypericin, hyperforin and hypericin) in St. John's Wort dietary supplements.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::82e2be2c85619dafd405146600e5ac16
https://doi.org/10.1016/s0378-4347(01)00404-2
https://doi.org/10.1016/s0378-4347(01)00404-2