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- W2365462815 abstract "Objective To investigate the extraction behaviors of hollow-fiber liquid phase microextraction (HFLPME) on jatrorrhizine, coptisine, palmatine and berberine for revealing the impacts of OH(H+) concentration in donor phase on enrichment of alkaline or acidic HFLPME analytes, thereby offering tools for measurement of pKb of weak alkaline analytes. Methods For liquid phase microextraction, polypropylene hollow-fiber was selected as the solvent carrier and n-octanol served as extraction solvent. The donor phase was 10-4 mol/L sodium hydroxide and the acceptor phase was 10-2 mol/L hydrochloric acid, with the stirring rate of 1200 r/min and extraction duration of 60 minutes. Results Under optimized extraction conditions, the pKb for jatrorrhizine, coptisine, palmatine and berberine was 6.95, 3.30, 3.40 and 4.08, respectively, with the enrichment factors ranging from 12.9 to 64.6. Conclusion The successful application of HFLPME has provided theoretical basis and experimental approaches for measurement of pKb of alkaline compounds." @default.
- W2365462815 created "2016-06-24" @default.
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- W2365462815 date "2012-01-01" @default.
- W2365462815 modified "2023-09-25" @default.
- W2365462815 title "Hollow-fiber liquid phase microextraction and application in determining pKb of alkaloids" @default.
- W2365462815 hasPublicationYear "2012" @default.
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