Zobrazeno 1 - 10
of 4 546
pro vyhledávání: '"IS, internal standard"'
Publikováno v:
Journal of Isotopes, Vol 37, Iss 3, Pp 227-236 (2024)
The 13C-labeled synthesis of cholesterol-3,4-13C2 was based on phenyl acetate-1,2-13C2 and 4-cholesten-3-one. 4-Cholesten-3-one was reacted in a certain proportion solvent mixed by isopropanol and water to obtain the carboxylic acid intermediate thro
Externí odkaz:
https://doaj.org/article/21ab1ee65243467086e9853969bd023f
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-6 (2024)
Abstract N-nitrosodimethylamine (NDMA) and N-nitrosodiethylamine (NDEA), group 2A carcinogens, were detected in finished drug products, including metformin, ranitidine, sartans and other drugs which caused multiple recalls in the USA and Europe. Impo
Externí odkaz:
https://doaj.org/article/7ec96fa1419147928ab542a3a6c5b5a9
Publikováno v:
Shipin gongye ke-ji, Vol 45, Iss 6, Pp 289-296 (2024)
In order to ensure the accuracy of laboratory test results, the uncertainty of the determination of indicative polychlorinated biphenyls in fish by gas chromatography was evaluated. According to the national Food Safety standard, National Food Safety
Externí odkaz:
https://doaj.org/article/2f384e2a26aa47e6b8b7b73e622f6594
Publikováno v:
Shipin gongye ke-ji, Vol 45, Iss 3, Pp 235-241 (2024)
A method was developed for determination of highly polar fungicide fosetyl-aluminium in plant-derived product of tomato, cabbage, grape, flammulina velutipes, rice, peanut by using liquid chromatography-tandem mass spectrometry. The best experimental
Externí odkaz:
https://doaj.org/article/037ae84f0ceb47f8b38f064ef78fc8c9
Publikováno v:
Shipin gongye ke-ji, Vol 45, Iss 1, Pp 277-283 (2024)
An ultra-high performance liquid chromatography-tandem mass spectrometry (UPLC-MS) method was developed for the determination of four β-agonists (terbutaline, clenbuterol, ractopamine, salbutamol) in braised meat. Samples were hydrolyzed by β-glucu
Externí odkaz:
https://doaj.org/article/784b1a7b12304bee89cfdf4d0eda1bd8
Publikováno v:
He jishu, Vol 47, Iss 1, Pp 141-152 (2024)
BackgroundThe conversion of UF6, which is a primary nuclear product, to UF4 in fluoride molten salt phase is expected to be used in the preparation or reconstitution of nuclear fuel salt for molten salt reactors, thus simplifying the process of molte
Externí odkaz:
https://doaj.org/article/900027dea0c541c4823e4ecaa38235e1
Autor:
YANG Liu1,2, JIANG Ying1,2, CHEN Yu-fang3, YAN Yuan-wei1, ZHU Fu-rong1,2, ZHOU Zhi-cheng1,2, LIU Guo-jun1,2, WANG Jin1,2"
Publikováno v:
Hecheng xiangjiao gongye, Vol 46, Iss 6, Pp 449-456 (2023)
Six kinds of natural rubbers and two kinds of isoprene rubbers were extracted with acetone as the solvent, and the selection of the internal standard for quantitative analysis of raw rubbers of natural rubber and isoprene rubber and vulcanizates of n
Externí odkaz:
https://doaj.org/article/6530fea8b48842498e5e2843a7f06979
Akademický článek
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Publikováno v:
Molecules, Vol 29, Iss 18, p 4290 (2024)
A novel high-performance liquid chromatography (HPLC) method with 4-N,N-dimethylaminobenzaldehyde as an internal standard was developed for the determination of Camphor with the main goal of facilitating the analysis of different cosmetic and pharmac
Externí odkaz:
https://doaj.org/article/d90f1105f2c7417b87f39d84916a0584
Standardization via Post Column Infusion—A Novel and Convenient Quantification Approach for LC-MS/MS
Publikováno v:
Molecules, Vol 29, Iss 16, p 3829 (2024)
Mass spectrometry (MS) is a widely used analytical technique including medical diagnostics, forensic toxicology, food and water analysis. The gold standard for quantifying compounds involves using stable isotope-labeled internal standards (SIL-IS). H
Externí odkaz:
https://doaj.org/article/9ca13df8ac8b452fbc7ef7eed72a0fd6