126727-04-6Relevant articles and documents
Determination of Chemical and Enantiomeric Purity of α-Amino Acids and their Methyl Esters as N-Fluorenylmethoxycarbonyl Derivatives Using Amylose-derived Chiral Stationary Phases
Islam, Md. Fokhrul,Adhikari, Suraj,Paik, Man-Jeong,Lee, Wonjae
, p. 332 - 338 (2019/04/13)
Liquid chromatographic enantiomer separation and simultaneous determination of chemical and enantiomeric purity of α-amino acids and their methyl esters as N-fluorenylmethoxycarbonyl (FMOC) derivatives was performed on three covalently bonded type chiral stationary phases (CSPs) derived from amylose derivatives. The enantiomer separation of α-amino acid esters as N-FMOC derivatives was better than that of the corresponding acids, especially for CSP 1 and 2. Chemical impurities as the corresponding racemic acids present in several commercially available racemic amino acid methyl esters were observed to be 0.49–17.50%. Enantiomeric impurities of several commercially available L-amino acid methyl esters were found to be 0.03–0.58%, whereas chemical impurities as the corresponding racemic acids present in the same analytes were found to be 0.13–13.62%. This developed analytical method will be useful for the determination of chemical and enantiomeric purity of α-amino acids and/or esters as N-FMOC derivatives using amylose-derived CSPs.
Rapid and sensitive LC-MS approach to quantify non-radioactive transition metal impurities in metal radionuclides
Zeng, Dexing,Anderson, Carolyn J.
supporting information, p. 2697 - 2699 (2013/05/08)
A rapid and sensitive LC-MS approach for the quantification of non-radioactive metal contaminants present in metal radionuclide formulations was developed. Traditional 12C/1H and heavy stable isotope 13C/2H-labeled chelator-amino acid conjugates are used as chelating agents to quantify contaminating transition metals, allowing for determination of effective specific activity of radio-metals. The Royal Society of Chemistry 2013.
Facile and selective deallylations of esters under 'aqueous' free-radical conditions
Perchyonok, V. Tamara,Ryan, Sarah J.,Langford, Steven J.,Hearn, Milton T.,Tuck, Kellie L.
body text, p. 1233 - 1235 (2009/04/05)
The conversion of allyl esters into carboxylic acids using radical initiators has been achieved in high yields in aqueous media. Georg Thieme Verlag Stuttgart.