Interaction of glucose with hemoglobin: a study in aqueous solution and at the air–water interface using the Langmuir–Blodgett technique

The rate at which a monomolecular film is deposited onto a solid substrate in the Langmuir-Blodgett process of preparing supported monolayer films influences the final structure of the transferred film. Attenuated total reflectance infrared spectroscopic studies of monolayers transferred to germanium substrates show that the speed at which the substrate is drawn through the air/water interface influences the final conformation in the hydrocarbon chains of amphiphilic film molecules. This transfer-induced effect is especially evident when the monolayer is transferred from the expanded region of surface-pressure-molecular-area isotherms at low surface pressures; the effect is minimized when the film molecules are transferred from condensed phases at high surface pressures. This phenomenon has been observed for both a fatty acid and a phospholipid, which suggests that these conformational changes may occur in a variety of hydrocarbon amphiphiles transferred from the air/water interface. This conformational ordering may be due to a kinetically limited phase transition taking place in the meniscus formed between the solid substrate and aqueous subphase. In addition, the results obtained for both the phospholipid and fatty acid suggest that the structure of the amphiphile may help determine the extent and nature of the transfer-speed-induced structural changes taking place in the monomolecular film.

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Effects of a central metal on the organization of 5,10,15,20-tetra-(p-chlorophenyl)–rare earth porphyrin hydroxyl compound at the air/water interface and in Langmuir–Blodgett films

Journal of Colloid and Interface Science ◽

10.1016/j.jcis.2004.10.053 ◽

2005 ◽

Vol 284 (2) ◽

pp. 582-592 ◽

Cited By ~ 7

Author(s):

Xiaoling Li ◽

Weiqing Xu ◽

Tamitake Itoh ◽

Akifumi Ikehata ◽

Bing Zhao ◽

...

Keyword(s):

Rare Earth ◽

Central Metal ◽

Water Interface ◽

Langmuir Blodgett ◽

Air Water Interface ◽

Langmuir Blodgett Films

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Pure and mixed films of a nitrostilbene derivative at the air–water interface, Langmuir–Blodgett multilayer fabrication, and optical characterization

Journal of Colloid and Interface Science ◽

10.1016/j.jcis.2006.12.080 ◽

2007 ◽

Vol 308 (1) ◽

pp. 239-248 ◽

Cited By ~ 12

Author(s):

Santiago Martín ◽

Pilar Cea ◽

Gorka Pera ◽

Marta Haro ◽

M. Carmen López

Keyword(s):

Optical Characterization ◽

Water Interface ◽

Langmuir Blodgett ◽

Air Water Interface ◽

Mixed Films

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BEHAVIOR OF METHYLENE BLUE WITH ARACHIDIC ACID IN THE RESTRICTED GEOMETRY OF LANGMUIR–BLODGETT FILM

Surface Review and Letters ◽

10.1142/s0218625x14500309 ◽

2014 ◽

Vol 21 (02) ◽

pp. 1450030

Author(s):

INDRA GHOSH ◽

AJITESH PAL ◽

JAYASREE NATH ◽

BIJAY KUMAR MISHRA ◽

RANENDU KUMAR NATH

Keyword(s):

Methylene Blue ◽

Quartz Substrate ◽

Arachidic Acid ◽

Layer By Layer ◽

Water Interface ◽

Restricted Geometry ◽

Langmuir Blodgett ◽

Isotherm Study ◽

Air Water Interface ◽

Interaction Kinetics

Anti-malarial methylene blue (MB) doped in arachidic acid (AA) have been incorporated in the Langmuir monolayer at the air–water interface and also in the Langmuir–Blodgett films deposited on quartz substrate. The pressure–area (π–A) isotherm studies at different concentrations of MB pointed out that pure MB could not form stable monolayer at the air–water interface and collapse readily at very low surface pressures. However, mixture of MB with AA formed stable monolayers and they could be transferred into solid quartz substrate to form mono/multi layered films of MB. The area per molecule of floating mixed monolayers was systematically decreased with the increasing concentrations of MB in the mixture. The pressure–time (π - t) isotherm study indicated the interaction kinetics between MB and AA. Higher the concentration of MB, higher is the increase in pressure. The spectroscopic characteristics of the mixed LB films have been compared with that of pure MB solution, microcrystal and layer-by-layer self assembled film with UV-Vis absorption spectroscopy. Surface morphology of the mixed LB and LbL film of MB was measured with atomic force microscopy (AFM).

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