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载银纳米复合物在体外抗菌性的研究

发布时间:2018-06-01 04:31

  本文选题:纳米复合涂层 + 纳米银颗粒 ; 参考:《泰山医学院》2012年硕士论文


【摘要】:研究背景 生物材料植入人体后最严重的并发症是感染,一旦发生会导致治疗的失败其结局是毁灭性的。感染对生物材料植入后有其自身的特点及发病原理,原理为在生物材料的表面形成物细菌生物膜[1]。在有生命或无生命物体的表面有着细菌附着,其细菌自身分泌具有高度的组织化并有多细胞群体结构并含有胞外黏质物的群体结构称为细菌生物膜。在其内部的细菌具有抵抗外部入侵和避免抗生素治疗的作用,细菌生物膜是导致生物材料植入感染难以控制的根源,细菌生物膜是与浮游的体外细胞所形成环境的相对的存在形式,其构成是由细菌和胞外多聚物[2]。细菌的生长方式是具有保护性的其可含有其高强度的组织化多为的细胞改变结构其性能就是附贴在样本生物置入材料的表面。样本表面形成的细菌生物膜生物膜其结构和功能特点是:细菌附着在支持物表面存在粘附定植方式很有利还增加了耐药和毒理基因的传递,,还有更有利于对抗宿主抗菌药物和免疫细胞及免疫分子的攻击相比与单个或混悬的菌细胞,同时还。其难以被消除的根本原因就是这些结构和功能特点。 现在国内与国对于生物膜的预防及抑制无有效作用,生物膜的治疗现在有很多都未有满意的临床疗效,现在有是“声裂法、酶处理法、超声波法、涡流法、电刺激法等等”。某些植入物的更换也无效有的对浮游细菌的的耐药菌株也没有作用,且有可能会引起耐药菌株的感染。纳米银是优秀的抗菌涂层材料具有活性强菌谱广的特点,制作出无菌涂层将抗菌材料应用于生物材料植入物表面提供了新的可行性思路[3]。 第一部分 载银纳米复合物涂层的准备 目的: 制备出含纳米银的抗菌涂层。检测载银纳米复合物的特征。方法:按质量比为1:20的比例将粉末状的平均粒直为10μm羟基磷灰石和5μm银粉进行备料。充分并且均匀分散两种粉末,使其两种粉末在QM-3SP2型上海(行星式)球磨机充分搅拌混合30分钟。应用在HK型的恒温水浴锅将混合的粉末通过电泳沉积到钛基体上。检测涂层成份和表征应用S-736型扫描电子显微镜、Magnna-IR550型红外光谱仪和PC型X射线衍射仪。 结果: 表明粒径平均为100nm左右的纳米银颗粒可以均匀的分散的和羟基磷灰石粉末充分混合通过经SEM、FTIR和XRD的分析,。 结论: 通过化学共沉淀法和机械球磨的方法成功将纳米银颗粒载入羟基磷灰石涂层。 第二部分 载银纳米复合物涂层在体外对生物膜形成的作用及原理 目的: 检测表皮葡萄球菌在生物膜形态及粘附的量,通过纳米银载入植入物表面后对表皮葡萄球菌生物膜形成的影响。 方法: 1.实验菌株为购买的阳性表皮葡萄球菌。在类似人体环境的37℃环境下将无菌的载银纳米复合物涂层的样本及无菌的不含银的复合物体分别放入到1.0x107CFU/ml10ml菌液中进行培养。分别在6,24,48,72小时对培养的载银纳米复合物的样本及不含银的复合物体的表面生物膜通过激光扫描共聚焦显微镜对其生物膜进行形态学观察及表面生物膜的细菌进行计数并对照。2.将制备好的样品复合物涂层放入胎牛血清中用ICP-NS(英国Agiilent公司)来检测并测试其释放的速率,同时将样品同样的方法放置在空气中12周后重新进行进行检测。同时测量表皮葡萄球菌粘附分子的atle的表达 结果: 不含银的复合物体在12小时左右已经出现了成熟的表皮葡萄球菌生物膜,载银纳米复合物表面48小之后才出现表皮葡萄球菌生物膜,同时将载银纳米涂层与羟基磷石灰石的样本表面涂层的粘附菌表面的量差异经行比较,具有统计学意义(p0.01)。 结论: 复合物具有银后很显著地改变了复合物涂层表面的活性,表皮葡萄球菌的粘附能力明显下降。说明载银纳米复合物涂层具有明确的抑制生物膜形成的作用;
[Abstract]:Background of the study

The most serious complication after implantation of the biological material into the human body is infection , and the outcome of the failure of the treatment will be devastating once it occurs . The infection has its own characteristics and pathogenesis after implantation of the biological material , and the principle is that the biofilm of bacterial biofilm is formed on the surface of the biological material . bacterial biofilm is a source of difficulty in controlling the implantation of biological materials , and the bacterial biofilm is the opposite existence form of the environment which is formed by bacteria and extracellular polymers . The bacterial biofilm biofilm formed on the surface of the sample surface has the advantages of favorable adhesion and implantation on the surface of the support surface and the transfer of the drug resistance and the toxicological gene , and is more favorable for resisting the attack of the host antibacterial drug and the immune cell and the immune molecule as compared with single or suspension bacteria cells , and the root cause of difficulty to be eliminated is the structural and functional characteristics .

Nano - silver is an excellent antibacterial coating material and has the characteristics of wide spectrum of active bacteria , and can be applied to the surface of the biological material implant to provide a new feasible thought for the application of the antibacterial material to the surface of the biological material implant .

the first portion

Preparation of silver - loaded nano - composite coating

Purpose :

The invention relates to a method for preparing a silver - carrying nano composite , which is characterized by comprising the following steps :

Results :

It is shown that nano - silver particles with an average particle size of about 100 nm can be uniformly dispersed with hydroxyapatite powder and analyzed by SEM , FTIR and XRD .

Conclusion :

Nano - silver particles were successfully loaded into hydroxyapatite coating by chemical coprecipitation and mechanical ball milling .

the second part

The effect and principle of silver - loaded nano - composite coating on biofilm formation in vitro

Purpose :

The effect of staphylococcus aureus on biofilm formation and adhesion was detected by loading nano - silver into the surface of the implant .

Method :

1 . The samples of silver - loaded nano - composite coating and the sterile silver - free composite were cultured in 1.0x107CFU / ml bacterial solution under 37 鈩

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