On-line membrane preconcentration for continuous monitoring of trace pharmaceuticals

Edmund J. Bishop, Somenath Mitra

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


Membrane pervaporation is presented as a method for on-line concentration and monitoring of trace analytes in a simulated pharmaceutical process stream. Pervaporation involves the selective transport of volatile organics across a membrane and into a gas stream. Experiments were carried out using a polar solvent-permeable Nafion membrane and several model pharmaceutical compounds. Solvent reductions greater than 90% and enrichment factors in excess of 7.9 were observed. Residence time and temperature were found to be important operating parameters. Interaction with membrane bound sulfonic acid residues resulted in the loss of reactive analytes such as 1,2-diphenylhydrazine. The concentrated stream was monitored using HPLC and UV/vis detection. Method detection limits were 0.5-1.2 μg/mL and the relative standard deviation for six repeat injections was 3.9-6.2%.

Original languageEnglish (US)
Pages (from-to)81-86
Number of pages6
JournalJournal of Pharmaceutical and Biomedical Analysis
Issue number1
StatePublished - Feb 7 2005

All Science Journal Classification (ASJC) codes

  • Drug Discovery
  • Analytical Chemistry
  • Spectroscopy
  • Clinical Biochemistry
  • Pharmaceutical Science


  • Chromatography
  • Membrane extraction
  • Pervaporation
  • Preconcentration
  • Sample preparation


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