Review article
FTIR study of lamellar and reversed micellar phases in the mono-oleoylglycerol/water system

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Abstract

The lamellar liquid crystalline (Lα) and the reversed micellar (L2) phases of mono-oleoylglycerol (MO) in water were investigated by Fourier transform infrared (FTIR) spectroscopy. From polarized infrared spectra of aligned bilayers of MO/water, order parameters (S) were determined for vibrational modes in the hydrocarbon chain region (symmetric CH2 stretch and olefinic CHCH stretch) and the aggregate surface region (CO stretch and asymmetric COOC stretch). The phase transition between Lα and L2 ( 10 wt% water) occurs in the temperature range 43–46°C. Already at about 32°C the LD value for the COH stretching vibration has decreased to 50% of its value at 25°C. A similar relative decrease in LD is obtained for the CO stretch and the asymmetric COOC stretch at about 38°C and for the CHCH stretch at about 43°C. It is concluded that the molecular ordering in the region of the aggregate surface starts to decrease at a lower temperature than for the acyl chain region. Infrared spectra show a significant decrease in the conformational order of the hydrocarbon chains at the Lα/L2 phase transition.

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