Symmetric pH-dependent swelling and antibacterial properties of chitosan brushes.
Symmetric pH-dependent swelling and antibacterial properties of chitosan brushes.
复制标题
壳聚糖刷的对称pH依赖性肿胀和抗菌特性。
DOI:
10.1021/la202616u
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发表时间:
2011-10-18
期刊:
影响因子:
--
通讯作者:
Composto RJ
中科院分区:
文献类型:
--
作者:
Lee HS;Eckmann DM;Lee D;Hickok NJ;Composto RJ
Charged polymer brushes grafted to surfaces are of great interest for antibacterial, biosensor, nanofluidic, and drug delivery applications. In this paper, chitosans with quaternary ammonium salts, CH-Q, were immobilized on silicon oxide and characterized by in-situ quartz-crystal microbalance with dissipation, QCM-D, and in-situ spectroscopic ellipsometry, SE. Both methods showed that the hydrated film exhibited a minimum thickness of ~40 nm near pH 5 that increased strongly (up to ~80 nm) at lower and higher pH. This symmetric swelling is surprising because CH-Q is a cationic polymer. The CH-Q grafted layer was stable for pH values from 3 to 8, and exhibited rapid, reversible swelling and contraction upon varying pH. The CH-Q layer also reduced S. aureus colonization by a factor of ~30× compared to bare silicon oxide and an amine terminated silane grafted to silicon oxide. This antibacterial characteristics of CH-Q is attributed to the quaternary ammonium salts and the flexible polymer brush.
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