Adsorption of ethoxylated cationic surfactants on self-assembled monolayers of alkanethiols on gold using surface plasmon resonance detection

Oskarsson, Hans; Holmberg, Krister

doi:10.1016/j.jcis.2006.05.045

Cited by 19 publications

(19 citation statements)

References 38 publications

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“…Hydrogen bonding and other attractive interactions between polar end groups of the alkane thiols are known to influence the apparent hydrophilicity and, thus, the wettability. 12 A 60 to 40 molar ratio of hydroxyl to methyl terminated alkane thiol resulted in a water contact angle of 72 AE 1 , which is in accordance with previously reported values 20 and this composition was chosen to make the model surface for the QCM-D experiments. The contact angle obtained at these SAM surfaces were repeatable and did not vary with time, indicating that the C11 chains of the alkane thiols used were long enough.…”

Section: Characterization Of Nonwoven and Tailoring The Gold Surfacessupporting

confidence: 79%

“…Tailoring the gold sensors to imitate the regenerated cellulose surface was achieved by immersing the cleaned sensor crystals overnight (16-20 h) in a 2.0 mM mixture of 60 mol% 11hydroxy-1-undecanethiol and 40 mol% 1-undecanethiol (Asemblon, USA) in ethanol (Kemetyl, Sweden, 99.5%, spectroscopic grade). 20 As a last step, the sensors were rinsed in ethanol and dried in nitrogen gas.…”

Section: Preparation Of Model Surfacesmentioning

confidence: 99%

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Polypeptide multilayer self-assembly and enzymatic degradation on tailored gold surfaces studied by QCM-D

2012

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Section: Characterization Of Nonwoven and Tailoring The Gold Surfacessupporting

confidence: 79%

Section: Preparation Of Model Surfacesmentioning

confidence: 99%

Polypeptide multilayer self-assembly and enzymatic degradation on tailored gold surfaces studied by QCM-D

2012

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“…Gold sensor surfaces, Sia Kit Au (Biacore, Sweden), were chemically modified with solutions of 16‐mercapto‐1‐hexadecanoic acid (Aldrich) and 16‐mercapto‐1‐hexadecanol in 99.5 % ethanol. 16‐Mercapto‐1‐hexadecanol was prepared by reduction of 16‐mercapto‐1‐hexadecanoic acid, according to Oskarsson et al18 The graft copolymers were synthesized from a branched poly(ethylene imine), PEI, ≥ MW 40,000, purchased as Polymin SN (BASF, Germany), poly( L ‐lysine) hydrobromide, PLL, MW 20,000 (Sigma, USA) and N ‐hydroxysuccinimidyl ester of methoxypoly(ethylene glycol) propionic acid, mSPA‐PEG, of MW 3400, (Nektar Therapeutics, USA). The proteins human serum albumin, HSA, and human fibrinogen (fraction 1) were from Sigma.…”

Section: Methodsmentioning

confidence: 99%

Comparison of PEI‐PEG and PLL‐PEG copolymer coatings on the prevention of protein fouling

Bergstrand

Rahmani-Monfared

Östlund

et al. 2008

J Biomedical Materials Res

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The effect of surface charge on the protein resistance of adsorbed layers of poly(ethylene imine)-[g]-poly(ethylene glycol), PEI-PEG, and poly(L-lysine)-[g]-poly(ethylene glycol), PLL-PEG, was studied. Mixed and monofunctional self-assembled monolayers, SAMs, on gold were obtained by adsorption of 16-mercapto-1-hexadecanoic acid and 16-mercapto-1-hexadecanol. The surface charge was systematically varied by changing the ratio of the two alkanethiols. The graft copolymers PEI-PEG and PLL-PEG were adsorbed at the SAMs and tested for resistance towards human serum albumin and fibrinogen. The adsorbed amount of copolymers increased with increasing negative surface charge. However, the best protein resistance was found at an intermediate surface charge. The PLL-PEG covered surfaces showed better protein resistance than the PEI-PEG covered surfaces. Thus, this work demonstrates that an adsorbed layer of PEG-grafted PEI and, in particular, PEG-grafted PLL is efficient in preventing protein adsorption when there is charge neutralization between the copolymer and the underlying surface.

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“…Both surface hydrophobicity and surface charge can be varied in a controlled manner [8]. SPR, which is an optical method, uses monochromatic light totally reflected at the interface of glass and gold.…”

Section: Adsorption At Self-assembled Monolayers On Goldmentioning

confidence: 99%

“…, and toluene (Merck) were used as purchased; 1-Hexadecanethiol, purum (>95%, GC) was purchased from Fluka, and 15-carboxypentadecanethiol (90%) was from Aldrich. Synthesis of 16-hydroxyhexadecanethiol is described in our previous work [8]. The buffer solutions used were from P-H Tamm Laboratorier AB.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Novel Alkylaminoamide Sugar Surfactants at Tailor‐made Surfaces

Oskarsson

Frankenberg

Annerling

et al. 2007

J Surfact & Detergents

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N,N-di(3-aminopropyl)dodecylamine (C12-Y-amine), N-dodecyl-N,N-di[(3-D-gluconylamido)propyl] amine (C12-DGA), N-dodecyl-N,N-bis[(3-lactobionylamido)propyl]amine (C12-DLA), N-dodecyl-N-[(3-lactobionylamido)propyl]amine (C12-LA), and ethoxylated N,N-di(3-aminopropyl)dodecylamine [C12-Y-amine with 4 and 8 ethylene oxide (EO)] have been synthesized,and their physical-chemical properties have been studied. Adsorption was measured at the air-water interface by the du Noü y ring method and at solid surfaces consisting of self-assembled monolayers (SAMs) of alkanethiols on gold using surface plasmon resonance. Results from surface tension measurements showed that adsorption at the air-water interface is pH dependent. At low pH, reduction in surface tension is less pronounced as a result of protonation of the amino groups of the surfactants. At the SAM model surfaces, generated by adsorption of alkanethiols or mixtures of alkanethiols on gold presenting methyl, hydroxyl, and carboxyl groups, the highest amount of adsorbed surfactant was obtained on a surface composed of a mixture of methyl and carboxyl groups. In general, the sugar-derived surfactants, DGA, DLA, and LA, adsorbed less than the ethoxylates. Surfactant biodegradation was investigated by the closed bottle test.Only C12-Y-amine was found to be readily biodegradable. However, the polyol surfactants were more biodegradable than the ethoxylates.

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Adsorption of ethoxylated cationic surfactants on self-assembled monolayers of alkanethiols on gold using surface plasmon resonance detection

Cited by 19 publications

References 38 publications

Polypeptide multilayer self-assembly and enzymatic degradation on tailored gold surfaces studied by QCM-D

Polypeptide multilayer self-assembly and enzymatic degradation on tailored gold surfaces studied by QCM-D

Comparison of PEI‐PEG and PLL‐PEG copolymer coatings on the prevention of protein fouling

Adsorption of Novel Alkylaminoamide Sugar Surfactants at Tailor‐made Surfaces

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