《Simultaneous determination of nine perfluoroalkyl carboxylic acids by a series of amide acetals derivatization and gas chromatography tandem mass spectrometry》 was written by Ji, Yongyan; Cui, Zongyan; Li, Xuemin; Wang, Zhibin; Zhang, Jinjie; Li, Adan. Category: ethers-buliding-blocks And the article was included in Journal of Chromatography A in 2020. The article conveys some information:
A novel and simple derivatization method using a series of amide acetals as derivatization reagents, along with gas chromatog. tandem mass spectrometry (GC-MS/MS) anal., were developed and validated for simultaneous determination of 9 perfluoroalkyl carboxylic acids (PFCAs) in this study. The structures and fragmentation pathway of PFCAs derivatives were deduced and verified. The derivatization method developed in this study improved the sensitivity of the detection of PFCAs by GC. The applicability of 6 amide acetals for the derivatization of PFCAs was demonstrated. Derivatization conditions for 9 PFCAs were optimized with addition of 20μL of derivatization reagent and reaction at 35°C for 30 min. 9 PFCAs derivatives were confirmed to be stable over 15 days. The instrument detection limits (IDLs) were lower than 0.01 pg/μL. The intra and inter-day precisions were below 4.06% and 5.48%, resp. To demonstrate the utility of the derivatization method, the level of PFCAs in the marine products were detected. The alk. digestion followed by solid-phase extraction (SPE) cleanup method was used for pretreatment. The method detection limits (MDLs) ranged from 0.04 to 0.10 ng/g, and the spiked recoveries ranged between 54.72% and 107.29%, with relative standard deviation (RSD) of 1.53%-11.89%. Five PFCAs were detected in the range of 0.66 to 499.03 ng/g dry weight The experimental process involved the reaction of N,N-Dimethylformamide Dimethyl Acetal(cas: 4637-24-5Category: ethers-buliding-blocks)
N,N-Dimethylformamide Dimethyl Acetal(cas: 4637-24-5) belongs to anime. Many important products require amines as part of their syntheses. Methylamine is utilized in the production of the analgesic meperidine (trade name Demerol) and the photographic developer Metol (trademark), and dimethylamine is used in the synthesis of the antihistamine diphenhydramine (trade name Benadryl), the solvent dimethylformamide (DMF), and the rocket propellant 1,1-dimethylhydrazine. The synthesis of the insect repellent N,N-diethyl-m-toluamide (DEET) incorporates diethylamine while that of the synthetic fibre Kevlar requires aromatic amines.Category: ethers-buliding-blocks
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