Novel amphiphilic polymers,cholesterol-end-capped poly(2-methacryloyloxyethyl phosphorylcholine)(CMPC) was specially designed as the drug delivery systems.Cytotoxicity of this novel amphiphiles was not observed as ind...Novel amphiphilic polymers,cholesterol-end-capped poly(2-methacryloyloxyethyl phosphorylcholine)(CMPC) was specially designed as the drug delivery systems.Cytotoxicity of this novel amphiphiles was not observed as indicated by cell culture.Anti-cancer drug adriamycin(ADR) was incorporated into the micelles by oil-in-water method.The release of ADR from the nanosphere continued over 7 d.The drug-loaded micelles could effectively restrain the growth of cancer cell.These results suggest that the drug loaded nanoparticles could be a good candidate for injectable drug delivery carrier.展开更多
A novel bioinspired phospholipid copolymer was synthesized by the free radical polymerization of poly-2-methacryloyloxyethylphosphorylcholine(MPC), stearyl methacrylate(SMA), hydroxypropyl methacrylate(HPMA) and trime...A novel bioinspired phospholipid copolymer was synthesized by the free radical polymerization of poly-2-methacryloyloxyethylphosphorylcholine(MPC), stearyl methacrylate(SMA), hydroxypropyl methacrylate(HPMA) and trimethoxysilylpropyl methacrylate(TSMA). A stable cross-linked coating was obtained via dip-coating, followed by curing at 70 ℃ for 9 h. Contact angle results indicate the coating surface rearrange to get a more hydrophilic surface on the polymer/water interface. The membrane mimic phosphorylcholine coating surface can resist the platelet adhesion and prolong plasma recalcification time significantly. Rhodamine S was used as model drugs to prepare drug-containing coating under the same conditions. Drug-releasing curves fall into Fickian release mechanism and there exists an efficient releasing-amount of the drug until 60 h.展开更多
The monomer of phosphorylcholine derivative, O-(5-（2-methacryloxy）-3, 3-dimethyl-3-azapentyl)-O’-（ω-hydroxy-octyl）-phosphatequaternary ammonium salt, was designed and synthesized successfully. It was characteriz...The monomer of phosphorylcholine derivative, O-(5-（2-methacryloxy）-3, 3-dimethyl-3-azapentyl)-O’-（ω-hydroxy-octyl）-phosphatequaternary ammonium salt, was designed and synthesized successfully. It was characterized by the spectra ofHNMR and Mass spectra （ESI+）, and every signal was assigned. Then the lubricating characteristics of the phosphorylcholinederivative were investigated on the tribological setup of ball-oh-flat. The Ultra-High Molecular Weight Polyethylene（UHMWPE） flat was rotated against a stainless steel ball with 6 mm diameter. The load was 2.3 N, which corresponded to amaximal Hertz contact pressure of 29 MPa. Water, phosphorylcholine derivative, and Acrylic Acid （AA） solution were used aslubricants, respectively. Compared with AA, the phosphorylcholine derivative shows significant lubrication. It can be stronglyhydrated under water due to the charged segment in chemical structure. The thick water layers within the chains serves asboundary lubricants, and this is thought to be the molecular origins of lubricating behavior.展开更多
A series of fluorinated phosphatidylcholine polyurethane macromolecular additives were synthesized by solution polymerization using methylenebis（phylene isocyanates） （MDI） and 1,4-butanediol （BDO） as hard segmen...A series of fluorinated phosphatidylcholine polyurethane macromolecular additives were synthesized by solution polymerization using methylenebis（phylene isocyanates） （MDI） and 1,4-butanediol （BDO） as hard segments, a new phoshporycholine, 2-（2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9-hexadecafluoro-10-（2-hydroxyethoxy）decyloxy） ethyl phosphorycholine （HDFOPC） as end-capper, and four polydiols, poly（tetramethylene glycol）s （PTMG）, polydimethylsiloxane （PDMS）, poly（1,6-hexyl-1,5-pentylcarbonate） （PHPC） and poly（propylene glycol） （PPG） as soft segments, respectively. The chemical structures of the synthesized polyurethanes were characterized by 1H-NMR and FTIR. DSC and DMA were employed to study the phase behavior of these novel polyurethanes due to their great influences on the surface properties, and hence their interactions with bio-systems. The results showed that phase separation of the fluorinated phosphatidylcholine end-capped polyurethanes was increased in comparison with that of normal polyurethanes. The effect of fluorinated phosphatidylcholine end-capped groups on the phase behavior was further demonstrated by analyzing the degree of hydrogen-bonding between hard and soft segments.展开更多
The water-soluble Ag nanoparticles capped with novel zwitterionic thioalkylated phosphorylcholine were synthesized.The Ag nanoparticles showed remarkable stability in saline media with salt concen-trations as high as ...The water-soluble Ag nanoparticles capped with novel zwitterionic thioalkylated phosphorylcholine were synthesized.The Ag nanoparticles showed remarkable stability in saline media with salt concen-trations as high as 2.0 mol/L and plasma using UV-vis absorption spectroscopy.Similarly,compared with tiopronin and citrate-protected Ag nanoparticles,the zwitterionic phosphorylcholine Ag nanopar-ticles did not precipitate out of solution when charged polyelectrolytes or biopolymers were added.The zwitterionic phosphorylcholine might be a better ligand for stabilizing metal nanoparticles.展开更多
Modification of biomaterials surface by mimetic cell membrane for improving biocompatibility, to imitate the excellent biological and physiological proper- ties of the natural cell membrane, is an important research a...Modification of biomaterials surface by mimetic cell membrane for improving biocompatibility, to imitate the excellent biological and physiological proper- ties of the natural cell membrane, is an important research area in materials science. Numerous studies have been attempted to construct a mimetic cell membrane biointer- face composed of phosphorylcholine （PC）-containing polymers or other phospholipid analogues on biomaterials surface. PC-containing biointerfaces show outstanding characteristics, especially in biological aspects such as blood compatibility and antifouling property. In this mini-review, the strategies of membrane mimetic modification of biomaterials and their antifouling applications are summarized.展开更多
文摘Novel amphiphilic polymers,cholesterol-end-capped poly(2-methacryloyloxyethyl phosphorylcholine)(CMPC) was specially designed as the drug delivery systems.Cytotoxicity of this novel amphiphiles was not observed as indicated by cell culture.Anti-cancer drug adriamycin(ADR) was incorporated into the micelles by oil-in-water method.The release of ADR from the nanosphere continued over 7 d.The drug-loaded micelles could effectively restrain the growth of cancer cell.These results suggest that the drug loaded nanoparticles could be a good candidate for injectable drug delivery carrier.
文摘A novel bioinspired phospholipid copolymer was synthesized by the free radical polymerization of poly-2-methacryloyloxyethylphosphorylcholine(MPC), stearyl methacrylate(SMA), hydroxypropyl methacrylate(HPMA) and trimethoxysilylpropyl methacrylate(TSMA). A stable cross-linked coating was obtained via dip-coating, followed by curing at 70 ℃ for 9 h. Contact angle results indicate the coating surface rearrange to get a more hydrophilic surface on the polymer/water interface. The membrane mimic phosphorylcholine coating surface can resist the platelet adhesion and prolong plasma recalcification time significantly. Rhodamine S was used as model drugs to prepare drug-containing coating under the same conditions. Drug-releasing curves fall into Fickian release mechanism and there exists an efficient releasing-amount of the drug until 60 h.
基金the National Natural Science Foundation of China(50975145)the High Technology Project of Jiangsu Province(BC20077046)for their financial support
文摘The monomer of phosphorylcholine derivative, O-(5-（2-methacryloxy）-3, 3-dimethyl-3-azapentyl)-O’-（ω-hydroxy-octyl）-phosphatequaternary ammonium salt, was designed and synthesized successfully. It was characterized by the spectra ofHNMR and Mass spectra （ESI+）, and every signal was assigned. Then the lubricating characteristics of the phosphorylcholinederivative were investigated on the tribological setup of ball-oh-flat. The Ultra-High Molecular Weight Polyethylene（UHMWPE） flat was rotated against a stainless steel ball with 6 mm diameter. The load was 2.3 N, which corresponded to amaximal Hertz contact pressure of 29 MPa. Water, phosphorylcholine derivative, and Acrylic Acid （AA） solution were used aslubricants, respectively. Compared with AA, the phosphorylcholine derivative shows significant lubrication. It can be stronglyhydrated under water due to the charged segment in chemical structure. The thick water layers within the chains serves asboundary lubricants, and this is thought to be the molecular origins of lubricating behavior.
基金financially supported by the National Natural Science Foundation of China(No.50673063)Program for the New-Century Excellent Talents of Ministry of Education of China(NCET-08-0381)Sichuan Provincial Science Fund for Distinguished Young Scholars(09ZQ026-024)
文摘A series of fluorinated phosphatidylcholine polyurethane macromolecular additives were synthesized by solution polymerization using methylenebis（phylene isocyanates） （MDI） and 1,4-butanediol （BDO） as hard segments, a new phoshporycholine, 2-（2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9-hexadecafluoro-10-（2-hydroxyethoxy）decyloxy） ethyl phosphorycholine （HDFOPC） as end-capper, and four polydiols, poly（tetramethylene glycol）s （PTMG）, polydimethylsiloxane （PDMS）, poly（1,6-hexyl-1,5-pentylcarbonate） （PHPC） and poly（propylene glycol） （PPG） as soft segments, respectively. The chemical structures of the synthesized polyurethanes were characterized by 1H-NMR and FTIR. DSC and DMA were employed to study the phase behavior of these novel polyurethanes due to their great influences on the surface properties, and hence their interactions with bio-systems. The results showed that phase separation of the fluorinated phosphatidylcholine end-capped polyurethanes was increased in comparison with that of normal polyurethanes. The effect of fluorinated phosphatidylcholine end-capped groups on the phase behavior was further demonstrated by analyzing the degree of hydrogen-bonding between hard and soft segments.
基金Supported by the National Natural Science Foundation of China (Grant Nos. 20774082 and 50703036)National High Technology Research and Development Program of China (Grant Nos. 2006AA03Z329 and 2006AA032444)Science and Technology Projects of Zhejiang Province (Grant No. 2007C24G2010020)
文摘The water-soluble Ag nanoparticles capped with novel zwitterionic thioalkylated phosphorylcholine were synthesized.The Ag nanoparticles showed remarkable stability in saline media with salt concen-trations as high as 2.0 mol/L and plasma using UV-vis absorption spectroscopy.Similarly,compared with tiopronin and citrate-protected Ag nanoparticles,the zwitterionic phosphorylcholine Ag nanopar-ticles did not precipitate out of solution when charged polyelectrolytes or biopolymers were added.The zwitterionic phosphorylcholine might be a better ligand for stabilizing metal nanoparticles.
基金The authors gratefully acknowledge the financial support of the National Basic Research Program of China （Grant No. 2012CB619100） and the National Natural Science Foundation of China （Grant Nos. 51372087, 51232002, and 51072055）.
文摘Modification of biomaterials surface by mimetic cell membrane for improving biocompatibility, to imitate the excellent biological and physiological proper- ties of the natural cell membrane, is an important research area in materials science. Numerous studies have been attempted to construct a mimetic cell membrane biointer- face composed of phosphorylcholine （PC）-containing polymers or other phospholipid analogues on biomaterials surface. PC-containing biointerfaces show outstanding characteristics, especially in biological aspects such as blood compatibility and antifouling property. In this mini-review, the strategies of membrane mimetic modification of biomaterials and their antifouling applications are summarized.
