Influence of electrolytes on the monolayer properties of saturated galactolipids at the air-water interface

Tomoala-Cotişel, Maria; Zsakó, J.; Chifu, Emil; Quinn, Peter J.

doi:10.1016/0009-3084(83)90059-2

Cited by 35 publications

(25 citation statements)

References 17 publications

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Section: Discussionsupporting

confidence: 92%

“…From our experiments it is observed that MGDG presents a LC phase changing to solid film at π > 13 mN·m -1 , in agreement with the results obtained for saturated MGDG [29,31]. Also, our results for the collapse pressure are in agreement with previous results for saturated MGDG [29] and for pure UQ [10]. On the contrary, reported results in literature for unsaturated MGDG [11,27,28] showed a continuous LE phase according with the double bonds present in its structure, and also showed a collapse pressure of ca.…”

Section: Discussionsupporting

confidence: 91%

“…3 Several studies have been performed on galactolipids due to their relevance in photosynthesis and other natural processes like cell growth modulator [20], anti-inflammatory [21,22] and anti-cancer agent [23][24][25][26]. One of the most relevant model membrane information is the galactolipid phase behaviour, especially its liquid-crystalline packing properties which has been widely investigated [27][28][29][30][31][32][33][34][35]. The most important difference between membrane galactolipids from different organisms is the saturation grade of these lipid acyl chains, being commonly polyunsaturated for higher plants and monounsaturated or fully saturated for microorganisms [29,36,37].…”

Section: Introductionmentioning

confidence: 99%

“…One of the most relevant model membrane information is the galactolipid phase behaviour, especially its liquid-crystalline packing properties which has been widely investigated [27][28][29][30][31][32][33][34][35]. The most important difference between membrane galactolipids from different organisms is the saturation grade of these lipid acyl chains, being commonly polyunsaturated for higher plants and monounsaturated or fully saturated for microorganisms [29,36,37]. Saturated MGDG (Scheme 1C) has only been used previously for MGDG structure characterization.…”

Section: Introductionmentioning

confidence: 99%

“…Gzyl-Malcher et al [28] work revealed behaviour differences between MGDG or DGDG with different acyl chain saturation grade. TomoaiaCotisel et al [29,31] studied the monolayer properties of saturated galactolipids with different subphases indicating that the nature of the subphase anion produces a variation of the limiting area. Physicochemical properties of lipid-quinone monolayers were studied with the Langmuir technique by Quinn and Esfahani [10] using 1,2-dimyristoylphosphatydilcholine and UQ, achieving interesting results for phospholipid model membrane.…”

Section: Introductionmentioning

confidence: 99%

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Biomimetic monolayer films of monogalactosyldiacylglycerol incorporating ubiquinone

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Journal of Colloid and Interface Science

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Ubiquinone and plastoquinone are two of the main electron and proton shuttle molecules in biological systems, and monogalactosyldiacylglycerol (MGDG) is the most abundant lipid in the thylakoid membrane of chloroplasts. Saturated MGDG, ubiquinone-10 (UQ) and MGDG:UQ mixed monolayers at the air/water interface have been studied using Surface Pressure-Area isotherms and Brewster Angle Microscopy. Moreover, the transferred Langmuir-Blodgett films have been observed by Atomic Force Microscopy. The results show that MGDG:UQ mixtures present more fluid phase than pure MGDG indicating a higher order degree for the later. It is also observed an important influence of UQ on the MGDG matrix before UQ collapse pressure and a low influence after this event, due to UQ expulsion from the MGDG matrix. This expulsion leads to a similar remaining UQ content for all the tested mixtures, indicating a limiting content of this molecule in the MGDG matrix at high surface pressures. The thermodynamic studies confirm the stability of the MGDG:UQ mixtures at low surface pressures, although presenting a non-ideal behaviour. Results point to consider UQ as a good candidate for studies of artificial photosynthesis.

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