Phase Transition Behaviour of Monogalactosyldiacylglycerol
Monoglactosyldiacylglycerol is the major polar lipid component of the photosynthetic membrane and in higher plant chloroplasts it represents about half, by weight, of the total polar lipids. A particular feature of this lipid species is that, in certain plants such as bean and spinach, the fatty acyl composition is dominated by linolenic acid. This unusual polyunsaturated fatty acyl chain composition has been found to be a major factor in determining the phase behaviour of the lipid in aqueous systems (Gounaris et al., 1983). Studies of the fully saturated lipid species have been reported (Sen et al., 1983) which indicate the presence of metastable states. These states are characterized by decay rates that depend on the temperature and water content of the dispersion. This paper describes time-resolved X-ray diffraction experiments aimed to investigate phase transition behaviour in saturated m onogalactosyldiacylglycerol.
KeywordsPhase Transition Behaviour Total Polar Lipid Exothermic Transition Fatty Acyl Residue High Plant Chloroplast
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