Abstract
AbstractSurface pressure‐area measurements of purified chlorophyll a and monogalactosyl diacylglycerol in mixed monolayers were performed at 20°C with an automatic recording surface film balance at a constant compression rate. In addition structural parts of the chlorophyll and the monogalactosyl diacylglycerol as phytol and geranylgeraniol on one hand and different fatty acids on the other were studied pure and in mixed films. All components studied formed stable monomolecular films. Chlorophyll a and monogalactosyl diacylglycerol showed miscibility. Phytol was immiscible with synthetized monogalactosyl diacylglycerol containing only stearic acid. Mixed monolayers of phytol and monogalactosyl diacylglycerol isolated from barley containing 83 mol % a‐linolenic acid showed a strong interaction. An increased miscibility and association were found between phytol and fatty acids with increasing unsaturation. The results are discussed as a model for the localization of part of chlorophyll a in the thylakoid membrane.
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