可降解材料作为生物材料的重要组成部分,其体内降解性能的好坏往往决定着材料植入后的成败。因此,对材料体内降解的评价显得尤为重要。传统的生物材料体内降解评价方法需要在各取样点取出不同批次的降解样品,阻止了对同一个实验样品降...可降解材料作为生物材料的重要组成部分,其体内降解性能的好坏往往决定着材料植入后的成败。因此,对材料体内降解的评价显得尤为重要。传统的生物材料体内降解评价方法需要在各取样点取出不同批次的降解样品,阻止了对同一个实验样品降解过程的连续测量,并且存在样品需求量大的问题。小动物活体成像系统(in vivo imaging system,IVIS)具有非侵入性、操作性强等特点,为解决上述问题提供了思路。本研究旨在建立一种利用小动物荧光成像系统检测可降解材料降解性能的方法,通过将近红外荧光染料经化学反应标记到可降解材料上,由荧光强度的变化反应材料的降解程度。体内降解实验表明此方法制得的荧光标记材料,荧光稳定性高,材料降解过程中荧光强度变化与质量损失拟合效果良好(R2=0.9994)。综上,该方法解决了测量材料降解样品量大的问题,并且提高了实验过程的连贯性。展开更多
The corrosion behavior of pure Mg,AZ31,and AZ91D were evaluated in various in vitro and in vivo environments to investigate the potential application of these metals as biodegradable implant materials.DC polarization ...The corrosion behavior of pure Mg,AZ31,and AZ91D were evaluated in various in vitro and in vivo environments to investigate the potential application of these metals as biodegradable implant materials.DC polarization tests and immersion tests were performed in different simulated body solutions,such as distilled（DI） water,simulated body fluid（SBF） and phosphate buffered solution（PBS）.Mg/Mg alloys were also implanted in different places in a mouse for in vivo weight loss and biocompatibility investigations.The in vivo subcutis bio-corrosion rate was lower than the corrosion rate for all of the in vitro simulated corrosive environments.The Mg/Mg alloys were biocompatible based on histology results for the liver,heart,kidney,skin and lung of the mouse during the two months implantation.Optical microscopy and scanning electron microscopy were carried out to investigate the morphology and topography of Mg/Mg alloys after immersion testing and implantation to understand the corrosion mechanisms.展开更多
文摘可降解材料作为生物材料的重要组成部分,其体内降解性能的好坏往往决定着材料植入后的成败。因此,对材料体内降解的评价显得尤为重要。传统的生物材料体内降解评价方法需要在各取样点取出不同批次的降解样品,阻止了对同一个实验样品降解过程的连续测量,并且存在样品需求量大的问题。小动物活体成像系统(in vivo imaging system,IVIS)具有非侵入性、操作性强等特点,为解决上述问题提供了思路。本研究旨在建立一种利用小动物荧光成像系统检测可降解材料降解性能的方法,通过将近红外荧光染料经化学反应标记到可降解材料上,由荧光强度的变化反应材料的降解程度。体内降解实验表明此方法制得的荧光标记材料,荧光稳定性高,材料降解过程中荧光强度变化与质量损失拟合效果良好(R2=0.9994)。综上,该方法解决了测量材料降解样品量大的问题,并且提高了实验过程的连贯性。
基金sponsored by the National Science Foundation(NSF) Engineering Research Center(ERC) for Revolutionizing Metallic Biomaterials(RMB)the Business for International Cooperative Research and Development between Industry,Academy and Research Institute funded by the Korean Small and Medium Business Administration(No.00042172-1)
文摘The corrosion behavior of pure Mg,AZ31,and AZ91D were evaluated in various in vitro and in vivo environments to investigate the potential application of these metals as biodegradable implant materials.DC polarization tests and immersion tests were performed in different simulated body solutions,such as distilled（DI） water,simulated body fluid（SBF） and phosphate buffered solution（PBS）.Mg/Mg alloys were also implanted in different places in a mouse for in vivo weight loss and biocompatibility investigations.The in vivo subcutis bio-corrosion rate was lower than the corrosion rate for all of the in vitro simulated corrosive environments.The Mg/Mg alloys were biocompatible based on histology results for the liver,heart,kidney,skin and lung of the mouse during the two months implantation.Optical microscopy and scanning electron microscopy were carried out to investigate the morphology and topography of Mg/Mg alloys after immersion testing and implantation to understand the corrosion mechanisms.
