The Effect of Topologies and Refilling Short-chain PEG on Protein Adsorption
RESEARCH ARTICLE|Updated:2023-11-27
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The Effect of Topologies and Refilling Short-chain PEG on Protein Adsorption
Chinese Journal of Polymer ScienceVol. 41, Issue 12, Pages: 1879-1888(2023)
Affiliations:
a.State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
b.School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, China
Li, C.; Zhang, J. N.; Jin, J.; Jiang, W. The effect of topologies and refilling short-chain PEG on protein adsorption. Chinese J. Polym. Sci. 2023, 41, 1879–1888
Chi Li, Jia-Ning Zhang, Jing Jin, et al. The Effect of Topologies and Refilling Short-chain PEG on Protein Adsorption[J]. Chinese Journal of Polymer Science, 2023, 41(12): 1879-1888.
Li, C.; Zhang, J. N.; Jin, J.; Jiang, W. The effect of topologies and refilling short-chain PEG on protein adsorption. Chinese J. Polym. Sci. 2023, 41, 1879–1888DOI: 10.1007/s10118-023-2971-x.
Chi Li, Jia-Ning Zhang, Jing Jin, et al. The Effect of Topologies and Refilling Short-chain PEG on Protein Adsorption[J]. Chinese Journal of Polymer Science, 2023, 41(12): 1879-1888.DOI: 10.1007/s10118-023-2971-x.
The Effect of Topologies and Refilling Short-chain PEG on Protein Adsorption
SH-PEG and SH-PEG-SH polymers can form linear and looped conformation on the surface by gold-sulfur bonds
respectively. Refilling short-chain PEGs can be seen clearly to improve protein resistance
and the substrate conformation-dependence occurred during protein adsorption.
Abstract
PEGylation is the gold standard for constructing protein resistance surfaces. Herein
grafting mPEG-SH and SH-PEG-SH with varied molecular weights (Mw=5K
10K
and 20K) on a gold chip
and the subsequent lysozyme adsorptions of the PEG layers are evaluated using quartz-crystal microbalance based on dissipation (QCM-D). The lysozyme resistance depends on the features of grafting density and chain conformation
i.e.
linear and looped conformation. However
long-chain PEG (Mw≥10K) is insufficient to form a dense layer to resist protein due to large steric hindrances. Short-chain PEG (Mw=1K) with linear and looped structures is used to refill onto the long-chain PEG layer to increase the grafting density of PEGs and improve protein resistance. The refilling process and the subsequent protein adsorption depend on conformation rather than the density of the long-chain PEG substrate. Notably
the long-chain PEG looped substrates significantly improve protein resistance
attributing to the high viscoelasticity of the looped substrate and an increase in grafting density after refilling. Thus
refilling short-chain PEG improves protein resistance and the substrate conformation-dependence gives insight into the impact of topology
providing new ideas for how to increase chain density and select suitable topo
logy to resist protein adsorption and demonstrating a potential application in biomedical fields.
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