Abstract
The retention behaviour of sulphated oligoethylene glycol nonylphenyl ether anionic surfactants was investigated in normal-phase systems with nitrile and amino chemically bonded stationary phases and with organic mobile phases containing tetraalkylammonium additives. Non-linear plots of the logarithms of capacity factors versus the number of oxyethylene units in sulphated oligomers were observed on the bonded amino column in mobile phases consisting of cetyltrimethylammonium bromide, 2-propanol and n-heptane. It is possible to separate sulphated oligomers and their parent non-sulphated analogues in a single run in these systems using gradient elution.
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