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Interactions of Pluronics with phospholipid monolayers at the air-water interface. 2005

Lin-Chau Chang, and Chia-Yu Lin, and Min-Wen Kuo, and Churn-Shiouh Gau
School of Pharmacy, College of Medicine, National Taiwan University, No. 1, Sect. 1, Jen-Ai Rd., Taipei, Taiwan.

Pluronics are triblock copolymers which are extensively applied excipients shown to interact with cell membranes. The aim of our study was to apply monolayer techniques and epifluorescence microscopy to investigate the interaction behavior between selected Pluronics and phospholipid monolayers which serve as a model of cell membranes. The results showed that Pluronic L61 with hydrophobic proportions much larger than those of F68 demonstrated condensed film-like surface behavior while F68 exhibited more expanded behavior. The increments of surface pressure and the changes of image were more obvious in adding Pluronic L61 than F68 to the subphase of dipalmitoylphosphatidylcholine (DPPC) monolayers, which indicated that the interaction may be related to van der Waals forces and hydrophobic interaction. Pluronics selected with higher hydrophobicities demonstrated larger surface activities and penetration abilities while being added to the subphase of DPPC and dimyristoylphosphatidylcholine (DMPC) monolayers. Pluronic P85 and F68 were found to be squeezed to subphase at higher surface pressures, which may be attributed to their relatively higher hydrophilicities.

UI MeSH Term Description Entries
D007700 Kinetics The rate dynamics in chemical or physical systems.
D010743 Phospholipids Lipids containing one or more phosphate groups, particularly those derived from either glycerol (phosphoglycerides see GLYCEROPHOSPHOLIPIDS) or sphingosine (SPHINGOLIPIDS). They are polar lipids that are of great importance for the structure and function of cell membranes and are the most abundant of membrane lipids, although not stored in large amounts in the system. Phosphatides,Phospholipid
D000388 Air The mixture of gases present in the earth's atmosphere consisting of oxygen, nitrogen, carbon dioxide, and small amounts of other gases.
D014867 Water A clear, odorless, tasteless liquid that is essential for most animal and plant life and is an excellent solvent for many substances. The chemical formula is hydrogen oxide (H2O). (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed) Hydrogen Oxide
D020442 Poloxamer A nonionic polyoxyethylene-polyoxypropylene block co-polymer with the general formula HO(C2H4O)a(-C3H6O)b(C2H4O)aH. It is available in different grades which vary from liquids to solids. It is used as an emulsifying agent, solubilizing agent, surfactant, and wetting agent for antibiotics. Poloxamer is also used in ointment and suppository bases and as a tablet binder or coater. (Martindale The Extra Pharmacopoeia, 31st ed) Pluronic,Poloxamers,Pluronic F-108,Pluronic F-127,Pluronic F-68,Pluronic F68,Pluronic L-101,Pluronic L-121,Pluronic L-81,Pluronics,Poloxalkol,Poloxamer 188,Poloxamer 213,Poloxamer 2930,Poloxamer 338,Poloxamer 407,188s, Poloxamer,213s, Poloxamer,2930s, Poloxamer,338s, Poloxamer,407s, Poloxamer,F68s, Pluronic,Pluronic F 108,Pluronic F 127,Pluronic F 68,Pluronic F108,Pluronic F127,Pluronic F68s,Pluronic L 101,Pluronic L 121,Pluronic L 81,Pluronic L101,Pluronic L121,Pluronic L81,Poloxalkols,Poloxamer 188s,Poloxamer 213s,Poloxamer 2930s,Poloxamer 338s,Poloxamer 407s

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