An aqueous-based surface modification of poly(dimethylsiloxane) with poly(ethylene glycol) to prevent biofouling

Langmuir

Volumn 21, Issue 25, 2005, Pages 11957-11962

  Lee, Seunghwan ^a   Vörös, Janos ^a  

^a ETH ZURICH   (Switzerland)

Author keywords

[No Author keywords available]

Indexed keywords

ADSORPTION; FOULING; GRAFT COPOLYMERS; INTERFACES (MATERIALS); OPTICAL WAVEGUIDES; OXYGEN; PLASMAS; POLYETHYLENE GLYCOLS; PROTEINS; SOLUTIONS; SPECTROSCOPIC ANALYSIS;

OPTICAL WAVEGUIDE LIGHTMODE SPECTROSCOPY (OWLS); OXYGEN PLASMAS; POLY(DIMETHYLSILOXANE) (PDMS); POLY(L-LYSINE)-GRAFT-POLY(ETHYLENE GLYCOL) (PLL-G-PEG);

SURFACE TREATMENT;

POLYMER; PROTEIN;

ADSORPTION; BIOFOULING; CHEMISTRY; SURFACE PROPERTY;

ADSORPTION; BIOFOULING; POLYMERS; PROTEINS; SURFACE PROPERTIES;

EID: 29444445502     PISSN: 07437463     EISSN: None     Source Type: Journal    
DOI: 10.1021/la051932p     Document Type: Article

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34. (a) The attraction of PLL-g-PEG onto untreated PDMS is believed to be mainly due to the hydrophobic interaction between the PLL backbone and the PDMS surface. However, an electrostatic interaction is also possible if some hydroxyl groups are exposed at the PDMS surface. The exact mechanism of adsorption of PLL-g-PEG onto untreated PDMS is currently under investigation, (b) Although a majority of the experiments in this work have been done by employing HEPES with 10 mM ionic strength, a control experiment employing HEPES with 150 mM ionic strength (adjusted by adding NaCl) also was carried out (data not shown); the initial adsorbed mass of PLL-g-PEG was observed to be smaller by max. 20% due to weaker electrostatic attraction between the polymer and the substrate, however, the loss of PLL-g-PEG following the first exposure to serum and subsequent rinsing with buffer can be prevented. Nevertheless, no detectable difference in the protein-resistant capabilities was observed from both cases.
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36. (b) Drobeck, T.; Spencer, N. D.; Heuberger, M. Macromolecules 2005, 38, 5254. According to these studies, the PLL(20)-g[3.5]-PEG(5) exhibited ca. 17 nm under no external pressure on the mica surface. Considering that the PLL-g-PEG reveals a similar conformation on an oxidized PDMS surface, this film thickness is considerably smaller than the dimension of the channels in microfluidic systems (10 μm or higher).
37. 2, see Table 2) remained even after the rinsing, supporting the superior performance of Si-PEG-Si over Si-PEG in protein resistance.