NDLI: Ethoxylated copolymer surfactants for the HFA134a–water interface: interfacial activity, aggregate microstructure and biomolecule uptake

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Ethoxylated copolymer surfactants for the HFA134a–water interface: interfacial activity, aggregate microstructure and biomolecule uptake

Ethoxylated copolymer surfactants for the HFA134a–water interface: interfacial activity, aggregate microstructure and biomolecule uptake

Content Provider	Royal Society of Chemistry (RSC)
Author	Selvam, Parthiban Wu, Libo Porcar, Lionel Gouch, Ayanna Rocha, Sandro R. P. da Chokshi, Udayan
Copyright Year	2008
Abstract	In this work we examine the aggregation behavior of ethoxylated copolymer surfactants in 1,1,1,2-tetrafluoroethane in the presence of water, and the ability of such aggregates to uptake a model biomolecule. Our approach consists of developing a rational framework for understanding the behavior of interfacially active species at the HFA134a–water (HFA134a\|W) interface using a combination of in situ high-pressure tensiometry, spectroscopy, and small-angle neutron scattering (SANS). The optimum hydrophilic-to-HFA-philic balance (HFB) for the ethylene oxide–propylene oxide–ethylene oxide (EOnPO∼43EOn, where subscripts indicate the number of repeat units) surfactant series at the HFA134a\|W interface was determined at 298 K and saturation pressure of the propellant (under pressure). The selection of promising candidates for the reverse aggregate formation studies was based on the tension vs. HFB scan. Tensiometric information revealed that EO3PO43EO3 occupies a very large area per molecule at the HFA134a\|W interface, which represents a general trend for compressible solvents that are small and also able to interact with water more favorably than alkane solvents. The water solubilization capacity of the EO3PO43EO3surfactant was investigated in situ by UV-vis spectroscopy, with a suitable solvatochromic probe. At a surfactant concentration above the determined critical aggregation concentration, a shift in the absorption maximum of the probe towards that of pure water was observed as the water-to-surfactant ratio increases. A similar but more pronounced shift was observed in the presence of a co-solvent. The nature of the aqueous environment associated with the aggregates is discussed based on the spectroscopic results. The microstructure of the aggregates is investigated by SANS. Scattering curves were also used to confirm the uptake of a model protein in the reverse aggregates. The relevance of this work stems from the fact that reverse aggregates of water in HFA134a are potential candidate formulations for the delivery of hydrophilic drugs, including biomolecules, to and through the lungs.
Starting Page	357
Ending Page	366
Page Count	10
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	4
Issue Number	2
Journal	Soft Matter
DOI	10.1039/b710144a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Biomolecule Spectroscopy Ultraviolet\u2013visible spectroscopy 1,1,1,2-Tetrafluoroethane Neutron diffraction Interaction Ethylene Solvatochromism Copolymer Hydrophile Surfactant Protein
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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