By msv on Wednesday, February 9, 2000 - 08:28 am:
Has anyone had experience analysing non ionic, cationic and anionic surfactants mixtures using HPLC?
And has anyone worked with Alltech Surfactant R column?
I will be very grateful to any help about this matter.
By Rachel on Tuesday, February 15, 2000 - 07:41 am:
There's a nice paper by Elfakir and Lafosse for the separation of polyethoxylated alcohols and polyethylene glycols in a single HPLC run (non-ionic species plus PEG by-products). The analysis was done on Hypercarb.
I also know of a number of applications on silica based phases for both ionic and non-ionic phases.
If you need any more details / want any help with a method, e-mail me.
By Chris Pohl on Thursday, February 17, 2000 - 04:49 pm:
Presumably, you are interested in separating mixtures of surfactants but not specifically mixtures of all three classes of surfactants. I am aware of a product which contained all three classes of surfactants simultaneously but this is a very rare case. In general, anionic and cationic surfactants are incompatible with one another. Trying to separate mixtures contain both of them simultaneously can be quite difficult as they tend to form quite insoluble ion pairs in solution.
If you're interested in a reference that describes the general topic and supplies a lot of specific examples, I would suggest: Ion Chromatography by Joachim Weiss (published by VCH).
As far as your question with regard to the Alltech Surfactant R column is concerned, I don't believe you'll find it to be significantly different from a number of analogous polymeric macroporous styrenic reversed phase materials (e.g. Hamilton's PRP1 column or Dionex's MPIC NS1 column). It is worth pointing out that generally the chromatographic performance of silica based reversed phase columns is substantially superior to polymeric reversed phase columns when it comes to surfactants (especially aromatic surfactants).
By Tim Kearsley on Wednesday, March 22, 2000 - 11:18 am:
I, too, am looking to set up a method for detecting trace levels (~10ug/ml) of tergitol NP. The method is to check for detergent residues on equipment after washdown.
Does anyone out there have better conditions than mine. The chromatography I have now is MeCN/water on a C18 column, but it's not handsome!
Any suggestions will be welcome.
TimK.
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