Formation of micelles of the fourteen-carbon amphiphilic ammonium salt (N,N,N - trimethylglycinetetradecyl ester chloride - AS V-14), was studied using the ESR spin probe method. The probe used was 2-hexyl-2-[11-methoxy-11-oxoundecyl]-4,4-dimethyl-3oxazolidinyloxy [Met (5,10)]. The micelles formation process was signalized by changes in ESR spectra of a probe. The probe spectrum in aqueous environment has the shape of one broad line, whereas three narrow lines are observed in a hydrophobic environment. The study showed that the critical micellar concentration (CMC) of the AS V-14 compound amounts to about 1.7 mM. This agrees approximately with the value obtained from calorimetric measurements (1.9 ± 0.1 mM). After addition of oleic acid into the solution (by intensive shaking) it was found that AS V-14 micelles start to form at concentration of about 0.07 mM. The reduction in the CMC value may be caused by formation of mixed micelles, containing AS V-14 and fatty acid.
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