A refined one-filtration method for aqueous based nanofiltration and ultrafiltration membrane molecular weight cut-off determination using polyethylene glycols

Rosiah Rohani, Margaret Hyland, Darrell Patterson

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

A rapid, reliable and cheap method of characterizing the molecular weight cut-off (MWCO) of commercial and in-house fabricated membranes used in aqueous applications has been developed. MWCO can be determined by performing a single run of pressure filtrations with a mixture of polyethylene glycols (PEGs) in aqueous solution using one of two PEG oligomer mixtures: PEG 200 to PEG 1000 for nanofiltration membranes or PEG 1000 to PEG 6000 for low MWCO ultrafiltration membranes. Analysis is via a repeatable and accurate reverse phase high performance liquid chromatography (HPLC) method through a cheap chemical-bonded silica-based C8 column which finely resolves each of the PEG oligomers. Detection is via a low temperature evaporative light scanning detection (ELSD) method that resolves peaks to a molecular weight difference of just 44gmol-1 (corresponding to the CH2-O-CH2 structural unit difference between the oligomers), allowing the most precise ever one-filtration determination of MWCO. MWCO testing of commercially available membranes (from Koch, Filmtec™ and Hydranautics) confirmed the method gives MWCO in the expected range. Consequently, this new and refined method can effectively replace the previously required time consuming and costly multiple filtrations of individual PEG oligomers and other compounds for the determination of membrane MWCO for aqueous applications.

Original languageEnglish
Pages (from-to)278-290
Number of pages13
JournalJournal of Membrane Science
Volume382
Issue number1-2
DOIs
Publication statusPublished - 15 Oct 2011

Fingerprint

Nanofiltration
Ultrafiltration
Polyethylene glycols
glycols
polyethylenes
molecular weight
cut-off
Molecular Weight
Molecular weight
membranes
Membranes
oligomers
Oligomers
Nanofiltration membranes
liquid chromatography
High performance liquid chromatography
Reverse-Phase Chromatography
low molecular weights
Silicon Dioxide
High Pressure Liquid Chromatography

Keywords

  • C8 column
  • ELSD detector
  • HPLC
  • Molecular weight cut-off
  • Polyethylene glycol

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Science(all)
  • Biochemistry
  • Filtration and Separation

Cite this

A refined one-filtration method for aqueous based nanofiltration and ultrafiltration membrane molecular weight cut-off determination using polyethylene glycols. / Rohani, Rosiah; Hyland, Margaret; Patterson, Darrell.

In: Journal of Membrane Science, Vol. 382, No. 1-2, 15.10.2011, p. 278-290.

Research output: Contribution to journalArticle

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