title: Photocatalyzed surface modification of poly(dimethylsiloxane) with polysaccharides and assay of their protein adsorption and cytocompatibility.
abstract: An improved approach for the surface modification of poly(dimethylsiloxane) (PDMS) using carboxymethyl cellulose (CMC), carboxymethyl beta-1,3-dextran (CMD), and alginic acid (AA) was investigated. The PDMS substrates were first oxidized in a H(2)SO(4)/H(2)O(2) solution to transform the Si-CH(3) groups on their surfaces into Si-OH groups. Then methacrylate groups were grafted onto the substrates through a silanization reaction using 3-(trimethoxysilyl)propyl methacrylate. Sequentially, cysteamine was conjugated onto the silanized surfaces by the reaction between the thiol and methacrylate groups under 254 nm UV exposure. Afterward, the amino-terminated PDMS substrates were sequentially reacted with CMC, CMD, and AA in the presence of N-hydroxysuccinimide and 1-ethyl-3-[3-(dimethylamino)propyl]carbodiimide, resulting in the grafting of polysaccharides onto PDMS surfaces. The composition and chemical state of the modified surfaces were characterized by X-ray photoelectron spectroscopy (XPS). In addition, the stability and dynamic characteristics of the polysaccharide-grafted PDMS substrates were investigated by XPS and temporal contact angle experiments. A protein adsorption assay using bovine serum albumin (BSA), chicken egg albumin, lysozyme, and RNase-A showed that the introduction of CMD and AA can reduce the adsorption of negatively charged BSA and chicken egg albumin, but increase the adsorption of the positively charged lysozyme and RNase-A. However, CMC-modified PDMS surfaces showed protein-repelling properties, regardless of whether the protein was positively or negatively charged. A cell culture and migration study of glioma C6, MKN-45, MCF-7, and HepG-2 cells revealed that the polysaccharide-modified PDMS greatly improved the cytocompatibility of native PDMS.
authors.affiliation: College of Science, and Shaanxi Key Laboratory of Molecular Biology for Agriculture, Northwest A&F University, Yangling, Shaanxi 712100, People's Republic of China.
authors.forename: Linyan
authors.initials: L
authors.lastname: Yang
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.forename: Qin
authors.initials: Q
authors.lastname: Tu
authors.forename: Li
authors.initials: L
authors.lastname: Ren
authors.forename: Yanrong
authors.initials: Y
authors.lastname: Zhang
authors.forename: Xueqin
authors.initials: X
authors.lastname: Wang
authors.forename: Zhiyun
authors.initials: Z
authors.lastname: Zhang
authors.forename: Wenming
authors.initials: W
authors.lastname: Liu
authors.forename: Liangliang
authors.initials: L
authors.lastname: Xin
authors.forename: Jinyi
authors.initials: J
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D000464:Alginates / Q000737:chemistry; D000818:Animals; D002266:Carboxymethylcellulose Sodium / Q000737:chemistry; D002417:Cattle; D045744:Cell Line, Tumor; D004129:Dimethylpolysiloxanes / Q000737:chemistry*; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D006801:Humans; D008689:Methacrylates / Q000737:chemistry; D009113:Muramidase / Q000737:chemistry; D017646:Organosilicon Compounds / Q000737:chemistry; D056951:Photoelectron Spectroscopy / Q000379:methods*; D011134:Polysaccharides / Q000737:chemistry*; D011506:Proteins / Q000737:chemistry*; D012259:Ribonuclease, Pancreatic / Q000737:chemistry; D012710:Serum Albumin, Bovine / Q000737:chemistry; D013499:Surface Properties; D047392:beta-Cyclodextrins / Q000737:chemistry
chemical_list: D000464:Alginates; D004129:Dimethylpolysiloxanes; D006603:Hexuronic Acids; D008689:Methacrylates; D017646:Organosilicon Compounds; D011134:Polysaccharides; D011506:Proteins; D047392:beta-Cyclodextrins; C441457:carboxymethyl-beta-cyclodextrin; D012710:Serum Albumin, Bovine; C013830:baysilon; D020723:Glucuronic Acid; D012259:Ribonuclease, Pancreatic; D009113:Muramidase; C505504:3-(trimethoxysilyl)propyl methacrylate; D002266:Carboxymethylcellulose Sodium