title: Library of Antifouling Surfaces Derived From Natural Amino Acids by Click Reaction.
abstract: Biofouling is of great concern in numerous applications ranging from ophthalmological implants to catheters, and from bioseparation to biosensors. In this report, a general and facile strategy to combat surface fouling is developed by grafting of amino acids onto polymer substrates to form zwitterionic structure through amino groups induced epoxy ring opening click reaction. First of all, a library of poly(2-hydroxyethyl methacrylate-co-glycidyl methacrylate) hydrogels with zwitterionic surfaces were prepared, resulting in the formation of pairs of carboxyl anions and protonated secondary amino cations. The analysis of attenuated total reflectance Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy confirmed the successful immobilization of amino acids on the hydrogel surfaces. After that, the contact angle and equilibrium water content of the modified hydrogels showed that the hydrogels exhibited improved hydrophilicity compared with the parent hydrogel. Furthermore, the protein deposition was evaluated by bicinchoninic acid assay using bovine serum albumin (BSA) and lysozyme as models. The results indicated that the performance of the hydrogels was determined by the nature of incorporated amino acid: the hydrogels incorporated with neutral amino acids had nonspecific antiadsorption capability to both BSA and lysozyme; the hydrogels incorporated with charged amino acids showed antiadsorption behaviors against protein with same charge and enhanced adsorption to the protein with opposite charge; the optimal antiadsorption performance was observed on the hydrogels incorporated with polar amino acids with a hydroxyl residual. The improvement of antiprotein fouling of the neutral amino acids grafted hydrogels can be ascribed to the formation of zwitterionic surfaces. Finally, a couple of soft contact lenses grafted with amino acids were fabricated having improved antifouling property and hydrophilicity. The result demonstrated the success of amino acids based zwitterionic antifouling strategy in ophthalmology. This strategy is also applicable to substrates including filtration membranes, microspheres and nanofibers as well. It is a versatile method for amino acids grafting onto polymer substrates to construct zwitterionic surfaces and achieve antifouling properties.
authors.affiliation: †School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Xu
authors.affiliation: †School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Hu
authors.affiliation: †School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Wang
authors.affiliation: †School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China.
authors.forename: Ye-Min
authors.initials: YM
authors.lastname: Zhang
authors.affiliation: †School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China.
authors.forename: Xiao-Jiu
authors.initials: XJ
authors.lastname: Liu
authors.affiliation: †School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China.
authors.forename: Bin-Bin
authors.initials: BB
authors.lastname: Xie
authors.affiliation: †School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Yao
authors.affiliation: ‡Suzhou Xin Wang Membrane Technology Co., Ltd., Suzhou 215000, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Li
authors.affiliation: †School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China.
authors.forename: Xin-Song
authors.initials: XS
authors.lastname: Li
mesh_terms: D000596:Amino Acids / Q000737:chemistry*; D000818:Animals; D057219:Biofouling; D002417:Cattle; D057930:Click Chemistry; D020100:Hydrogels / Q000737:chemistry; D057927:Hydrophobic and Hydrophilic Interactions; D009113:Muramidase / Q000737:chemistry / Q000378:metabolism; D056951:Photoelectron Spectroscopy; D011102:Polyhydroxyethyl Methacrylate / Q000031:analogs & derivatives / Q000737:chemistry; D011804:Quinolines / Q000737:chemistry; D012710:Serum Albumin, Bovine / Q000737:chemistry / Q000378:metabolism; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties
chemical_list: D000596:Amino Acids; D020100:Hydrogels; D011804:Quinolines; C515720:poly(hydroxyethyl methacrylate-co-glycerol methacrylate); D011102:Polyhydroxyethyl Methacrylate; D012710:Serum Albumin, Bovine; C047117:bicinchoninic acid; D009113:Muramidase
keywords: amino acids; antifouling surfaces; click reaction; hydrophilicity; zwitterionic