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1.
Soft Matter ; 16(19): 4569-4573, 2020 May 21.
Article in English | MEDLINE | ID: mdl-32373877
2.
J Biomater Sci Polym Ed ; 23(16): 2089-104, 2012.
Article in English | MEDLINE | ID: mdl-22105007

ABSTRACT

In order to develop a simple, economical and rapid approach to incorporate 2-methacryloyloxyethyl phosphorylcholine (MPC) with other monomers without any solvent, we prepared a series of ultraviolet cured poly(urethane acrylate) (PUA) membranes containing different MPC content. Their chemical structure and surface properties were investigated by FT-IR, XPS, water swelling ratio and water contact angle measurement, while the biocompatibilities were evaluated through fibrinogen adsorptions, platelet adhesion and plasma recalcification time determination. The results demonstrate that the phosphorylcholine (PC) groups were successfully introduced into the PUA system by the UV-curing approach and the all PC-containing membranes showed better biocompatibility than those without PC moiety. The UV-curing method is potentially to be applied in the coating of medical devices which require biocompatibility and manufacturing efficiency.


Subject(s)
Acrylic Resins/chemistry , Membranes, Artificial , Methacrylates/chemistry , Phosphorylcholine/analogs & derivatives , Polyurethanes/chemistry , Ultraviolet Rays , Acrylic Resins/chemical synthesis , Acrylic Resins/radiation effects , Calcification, Physiologic , Fibrinogen/chemistry , Humans , Hydrophobic and Hydrophilic Interactions , Materials Testing , Methacrylates/chemical synthesis , Methacrylates/radiation effects , Molecular Structure , Muramidase/chemistry , Phosphorylcholine/chemical synthesis , Phosphorylcholine/chemistry , Phosphorylcholine/radiation effects , Plasma/chemistry , Platelet Adhesiveness , Polyurethanes/chemical synthesis , Polyurethanes/radiation effects , Solvents/chemistry , Surface Properties , Water/chemistry
3.
J Biomed Mater Res B Appl Biomater ; 84(2): 320-7, 2008 Feb.
Article in English | MEDLINE | ID: mdl-17588248

ABSTRACT

We assumed that the extra energy supplied by gamma-ray irradiation produced cross-links in 2-methacryloyloxyethyl phosphorylcholine (MPC) polymer grafted cross-linked polyethylene (CLPE-g-MPC) and investigated its effects on the tribological properties of CLPE-g-MPC. In this study, we found that the gamma-ray irradiation produced cross-links in three kinds of regions of CLPE-g-MPC: poly(MPC) layer, CLPE-MPC interface, and CLPE substrate. The dynamic coefficient of friction of CLPE-g-MPC slightly increased with increasing irradiation doses. After the simulator test, both the nonsterilized and gamma-ray sterilized CLPE-g-MPC cups exhibited lower wear than the untreated CLPE ones. In particular, the gamma-ray sterilized CLPE-g-MPC cups showed extremely low and stable wear. As for the nonsterilized CLPE-g-MPC cups, the weight change varied with each cup. When the CLPE surface is modified by poly(MPC) grafting, the MPC graft polymer leads to a significant reduction in the sliding friction between the surfaces that are grafted because water thin films formed can behave as extremely efficient lubricants. Such a cross-link of poly(MPC) slightly increases the friction of CLPE by gamma-ray irradiation but provides a stable wear resistant layer on the friction surface. The cross-links formed by gamma-ray irradiation would give further longevity to the CLPE-g-MPC cups.


Subject(s)
Gamma Rays , Hip Prosthesis , Methacrylates , Phosphorylcholine/analogs & derivatives , Polymers/radiation effects , Biocompatible Materials , Materials Testing , Methacrylates/chemistry , Methacrylates/radiation effects , Phosphorylcholine/chemistry , Phosphorylcholine/radiation effects , Polyethylenes/chemistry , Polymers/chemistry , Spectroscopy, Fourier Transform Infrared
4.
J Mater Sci Mater Med ; 18(9): 1809-15, 2007 Sep.
Article in English | MEDLINE | ID: mdl-17483881

ABSTRACT

Osteolysis caused by wear particles from polyethylene in the artificial hip joints is a serious issue. We have used photo-induced radical graft polymerization to graft 2-methacryloyloxyethyl phosphorylcholine (MPC) polymer onto the surface of cross-linked polyethylene (CLPE-g-MPC) in order to reduce friction and wear at the bearing surface of the joint. The physical and mechanical properties of CLPE and CLPE-g-MPC were not significantly different, expect that the friction coefficient of untreated CLPE cups was 0.0075, compared with 0.0009 for CLPE-g-MPC cup, an 88% reduction. After 3.0 x 10(6) cycles in the hip joint simulator test, we could not observe any wear of CLPE-g-MPC cups. We concluded that the advantage of photo-induced radical graft polymerization technique was that the grafted MPC polymer gave a high lubricity only on the surface and has no effect on the bulk properties of the CLPE substrate.


Subject(s)
Biocompatible Materials/chemistry , Hip Prosthesis , Methacrylates/chemistry , Phosphorylcholine/analogs & derivatives , Polyethylene/chemistry , Biocompatible Materials/chemical synthesis , Biocompatible Materials/radiation effects , Chemical Phenomena , Chemistry, Physical , Hip Prosthesis/adverse effects , Humans , In Vitro Techniques , Materials Testing , Methacrylates/chemical synthesis , Methacrylates/radiation effects , Microscopy, Electron, Transmission , Phosphorylcholine/chemical synthesis , Phosphorylcholine/chemistry , Phosphorylcholine/radiation effects , Photochemistry , Polyethylene/chemical synthesis , Polyethylene/radiation effects , Polymethacrylic Acids , Prosthesis Failure , Spectroscopy, Fourier Transform Infrared , Spectrum Analysis , X-Rays
5.
Strahlenther Onkol ; 173(4): 230-5, 1997 Apr.
Article in German | MEDLINE | ID: mdl-9148435

ABSTRACT

AIM: With simultaneous application of Miltex and radiation therapy in the combined treatment of topical relapses and skin metastases in breast carcinoma patients the question arises, how radioresistant is the new cytotoxic agent. Because of the long penetration times of the active agent miltefosine the answer is important with particular regard to the time of the external application of Miltex. MATERIAL AND METHOD: After the application of a single dose of 10 Gy we studied the stability of the commercial preparation and its active agent miltefosine by means of absorption spectroscopy. RESULTS: Immediately following the irradiation no alterations in absorption spectra of Miltex and miltefosine were found. However, 2 and 8 h post radiation the absorption curves of Miltex and miltefosine solutions were distinctly changed. The radiation induced changes of Miltex dilutions were smaller than those of the miltefosine solutions. For the commercial preparation the amount of the radiation-induced destruction is 0.10. CONCLUSIONS: Consequently Miltex has shown a sufficient radioresistance or its decrease in the effectiveness is small. With daily single doses of 2 Gy in the radiotherapy of the topical relapses and skin metastases the destruction degree should be reduced to 0.02 assuming linear changes. Because of the distinct changes in the spectra and relative slow penetration of miltefosine in various cell lines [10, 11, 14] we will propose an application of the commercial cytotoxic agent 5 h before the radiation fractions. The smaller effect on Miltex is discussed in relation to the solution mediators of the active agent.


Subject(s)
Antineoplastic Agents/radiation effects , Phosphorylcholine/analogs & derivatives , Antineoplastic Agents/analysis , Drug Stability , Phosphorylcholine/analysis , Phosphorylcholine/radiation effects , Radiation Dosage , Radiation Tolerance , Solutions , Spectrophotometry, Ultraviolet/statistics & numerical data , Time Factors
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