Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Pentafluoropropionic anhydride PFPA

In this procedure, the amino groups are acylated with pentafluoropropionic anhydride (PFPA) and the carboxylic groups esterified with hexafluroisopropanol (HFIP) in a one-step procedure (Bertilsson and Costa, 1976), Typically, 100 pL of PFPA and 50 pL of HFIP are added to a freeze-dried or nitrogen-dried tissue extract and the mixture heated at 70°C for 1 h. The samples... [Pg.54]

Extraction Derivatization SFE Oven temperature Static extraction Dynamic extraction Extract isolation 20 mg ludr powder, treated with 20 pL ethyl acetate in the extraction cartridge (volume 150 jL) 60 C 15 min, 200—300 bar 5 min, 200—300 bar Transfer of the eluate to a sample botde with about 1 mL ethyl acetate. With pentafluoropropionic anhydride (PFPA). [Pg.742]

Previous derivatization of the extract is necessary to improve the stability of the compounds and the sensitivity and precision of subsequent GC-MS analysis. Silyl derivatives formed for example with MSTFA [43], halogenated alkene derivatives produced with heptafluorobutyric anhydride (HFBA) [36] or pentafluoropropionic acid [58] or anhydride (PFPA), as well as acetate derivatives formed using acetic anhydride [48] have been widely employed. [Pg.20]

CPH Chloroform/2-propanol/ -heptane PFPA Pentafluoropropionic anhydride... [Pg.205]

Pentafluoropropionyl derivative by pentafluoropropionic acid anhydride (PFPA). [Pg.702]

Depending upon the chromatographic system utilized, cocaine analytes (especially polar metabolites) may require derivatization prior to GC/MS analysis. Commonly utilized derivatization reagents include N,0-bis(trimethylsilyl)trifluoroaceta-mide (BSTFA), pentafluoropropionic acid anhydride/hexafluoroisopropanol (PFPA)/(HFIP), N-methyl-N-trimethylsilyltrifluoroacetamide (MSTFA), pentafluoropropionic acid anhydride/pentafluoropropanol (PFPA)/(PFP), iV,0-bis(trimethylsi-lyDacetamide (BSA) and N-methyl-N-(tert-butyldimethylsilyl)-trifluoroacetamide (MTBSTEA). For ease of analysis and stability of the derivatives, the authors prefer BSTFA with 1% trimethylchlorosilane (TMCS). [Pg.161]

See other pages where Pentafluoropropionic anhydride PFPA is mentioned: [Pg.285]    [Pg.53]    [Pg.30]    [Pg.7]    [Pg.106]    [Pg.492]    [Pg.383]    [Pg.285]    [Pg.2938]    [Pg.51]    [Pg.1169]    [Pg.420]    [Pg.435]    [Pg.285]    [Pg.53]    [Pg.30]    [Pg.7]    [Pg.106]    [Pg.492]    [Pg.383]    [Pg.285]    [Pg.2938]    [Pg.51]    [Pg.1169]    [Pg.420]    [Pg.435]    [Pg.2]    [Pg.17]    [Pg.115]    [Pg.106]    [Pg.111]    [Pg.371]    [Pg.2253]    [Pg.4341]    [Pg.272]    [Pg.222]    [Pg.497]   
See also in sourсe #XX -- [ Pg.2 , Pg.7 , Pg.12 , Pg.160 ]

See also in sourсe #XX -- [ Pg.54 , Pg.55 , Pg.56 ]



SEARCH



Pentafluoropropionic anhydride

© 2024 chempedia.info