Electrophoresis, Vol.26, No.21, 4127-4137, 2005
Glycine-based polymeric surfactants with varied polar head group: I. Synthesis characterization and application in micellar electrokinetic chromatography
The monomers and polymers of four anionic amide type sodium undecenoxy carbonyl glycinate (SUCG) surfactants and four anionic carbamate type sodium undecenoyl glycinate (SUG) surfactants with 1-, 2-, 3-, and 4-glycine unit as head group were synthesized and characterized. The CIVIC and aggregation number (A) for all eight surfactants were determined using fluorescence spectroscopy. In addition, the CIVIC values of these surfactants were also projected by surface tension and CE. The CIVIC of the monomers decreases with increases in the size of glycine head groups and correlates well when the fluorescence method was compared to CE. The A number increases and partial specific volume ((V) over bar) decreases with increase in size of the head group of both monomers and polymers. However, A and V are always lower for the polymers than the corresponding monomers. The electrophoretic and chromatographic parameters of micelle polymers of SUG and SUCG were also examined. The coefficient of EOF increases with the increase in size of the head group but the electrophoretic mobility decreases which results in a decrease in the elution range. The retention data suggest that the selectivity differences among the mono-, di-, and tripeptide derivatives of poly-SUCG surfactants are relatively higher compared to the derivatives of poly-SUG series.
Keywords:aggregation number;critical micelle concentration;hydrogen-bond acceptor benzene derivatives h;ydrogen-bond donor benzene derivatives;nonhydrogen bonding benzene derivatives