Zobrazeno 1 - 6
of 6
pro vyhledávání: '"Maureen A. Ngoh"'
Autor:
Lynda V. Podhorniak, Herbert F. Righter, Maureen A. Ngoh, Daniel J. Donoghue, David N. Heller, Michael H. Thomas
Publikováno v:
Journal of Chromatography B. 774:39-52
Two complementary methods for identifying and measuring sulfonamide residues in eggs were developed for use in surveying eggs for potential drug residues. The first method uses liquid chromatography–tandem mass spectrometry (LC–MS–MS) to confir
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4c3f0de43e12bac82541ecc0b1405c6b
https://doi.org/10.1016/s1570-0232(02)00187-3
https://doi.org/10.1016/s1570-0232(02)00187-3
Publikováno v:
Journal of AOAC INTERNATIONAL. 81:973-977
A method capable of quantitating cephapirin at a level of 20 ng/mL and ceftiofur at a level of 50 ng/mL was developed for raw bovine milk. Raw bovine milk is deproteinated with acetonitrile. The supernatant is collected and then acetonitrile is remov
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::92946c2b0f7242f6d9aa8b7a17600d25
https://doi.org/10.1093/jaoac/81.5.973
https://doi.org/10.1093/jaoac/81.5.973
Autor:
Maureen A Ngoh
Publikováno v:
Journal of AOAC INTERNATIONAL. 79:652-655
A method is described for determining tilmicosin in bovine milk by liquid chromatography with ultraviolet (UV) detection. Samples are defatted by centrifugation. The lower skim layer is cleaned on a C18 solid-phase extraction cartridge. The extract i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cd1cecfe82fe9c2a86270d7a4b81954c
https://doi.org/10.1093/jaoac/79.3.652
https://doi.org/10.1093/jaoac/79.3.652
Autor:
Maureen A. Ngoh, Richard Cullison
Publikováno v:
Journal of Agricultural and Food Chemistry. 44:2686-2689
A method capable of quantifying trichlorfon and dichlorvos in shrimp at concentrations of 20−80 ng/g has been developed. Ground shrimp is homogenized in ethyl acetate and centrifuged. The supernatant is dried completely on a rotatory evaporator. Th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e65b2c5985141ff1f6b30c9932cc52dc
https://doi.org/10.1021/jf960194v
https://doi.org/10.1021/jf960194v
Autor:
Maureen A Ngoh, Terry TerHune, Kenneth Thompson, Bret Hurshman, Terry Katz, Peter G. Wislocki, Allan Weingarten
Publikováno v:
Journal of agricultural and food chemistry. 51(16)
The objective of this study was to establish a withdrawal period for flunixin in milk by quantifying 5-hydroxyflunixin, the marker residue, in bovine milk as a function of time, following intravenous treatment of lactating dairy cows with flunixin-N-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5f7daff6c816ba9ae469de8570cf51f4
https://pubmed.ncbi.nlm.nih.gov/14705899
https://pubmed.ncbi.nlm.nih.gov/14705899
Publikováno v:
Journal of chromatography. B, Biomedical sciences and applications. 712(1-2)
A confirmation procedure is described for detection of residues of six tetracyclines in bovine milk, and oxytetracycline in shrimp. Residues are extracted from milk or shrimp tissue using metal chelate affinity chromatography. The extracts are desalt
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4e925aa20b1ac17f1d311f421c5a68df
https://pubmed.ncbi.nlm.nih.gov/9698234
https://pubmed.ncbi.nlm.nih.gov/9698234