載銀納米復合物在體外抗菌性的研究
發(fā)布時間:2018-06-01 04:31
本文選題:納米復合涂層 + 納米銀顆粒 ; 參考:《泰山醫(yī)學院》2012年碩士論文
【摘要】:研究背景 生物材料植入人體后最嚴重的并發(fā)癥是感染,一旦發(fā)生會導致治療的失敗其結局是毀滅性的。感染對生物材料植入后有其自身的特點及發(fā)病原理,原理為在生物材料的表面形成物細菌生物膜[1]。在有生命或無生命物體的表面有著細菌附著,其細菌自身分泌具有高度的組織化并有多細胞群體結構并含有胞外黏質物的群體結構稱為細菌生物膜。在其內部的細菌具有抵抗外部入侵和避免抗生素治療的作用,細菌生物膜是導致生物材料植入感染難以控制的根源,細菌生物膜是與浮游的體外細胞所形成環(huán)境的相對的存在形式,其構成是由細菌和胞外多聚物[2]。細菌的生長方式是具有保護性的其可含有其高強度的組織化多為的細胞改變結構其性能就是附貼在樣本生物置入材料的表面。樣本表面形成的細菌生物膜生物膜其結構和功能特點是:細菌附著在支持物表面存在粘附定植方式很有利還增加了耐藥和毒理基因的傳遞,,還有更有利于對抗宿主抗菌藥物和免疫細胞及免疫分子的攻擊相比與單個或混懸的菌細胞,同時還。其難以被消除的根本原因就是這些結構和功能特點。 現(xiàn)在國內與國對于生物膜的預防及抑制無有效作用,生物膜的治療現(xiàn)在有很多都未有滿意的臨床療效,現(xiàn)在有是“聲裂法、酶處理法、超聲波法、渦流法、電刺激法等等”。某些植入物的更換也無效有的對浮游細菌的的耐藥菌株也沒有作用,且有可能會引起耐藥菌株的感染。納米銀是優(yōu)秀的抗菌涂層材料具有活性強菌譜廣的特點,制作出無菌涂層將抗菌材料應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 載銀納米復合物涂層的準備 目的: 制備出含納米銀的抗菌涂層。檢測載銀納米復合物的特征。方法:按質量比為1:20的比例將粉末狀的平均粒直為10μm羥基磷灰石和5μm銀粉進行備料。充分并且均勻分散兩種粉末,使其兩種粉末在QM-3SP2型上海(行星式)球磨機充分攪拌混合30分鐘。應用在HK型的恒溫水浴鍋將混合的粉末通過電泳沉積到鈦基體上。檢測涂層成份和表征應用S-736型掃描電子顯微鏡、Magnna-IR550型紅外光譜儀和PC型X射線衍射儀。 結果: 表明粒徑平均為100nm左右的納米銀顆粒可以均勻的分散的和羥基磷灰石粉末充分混合通過經(jīng)SEM、FTIR和XRD的分析,。 結論: 通過化學共沉淀法和機械球磨的方法成功將納米銀顆粒載入羥基磷灰石涂層。 第二部分 載銀納米復合物涂層在體外對生物膜形成的作用及原理 目的: 檢測表皮葡萄球菌在生物膜形態(tài)及粘附的量,通過納米銀載入植入物表面后對表皮葡萄球菌生物膜形成的影響。 方法: 1.實驗菌株為購買的陽性表皮葡萄球菌。在類似人體環(huán)境的37℃環(huán)境下將無菌的載銀納米復合物涂層的樣本及無菌的不含銀的復合物體分別放入到1.0x107CFU/ml10ml菌液中進行培養(yǎng)。分別在6,24,48,72小時對培養(yǎng)的載銀納米復合物的樣本及不含銀的復合物體的表面生物膜通過激光掃描共聚焦顯微鏡對其生物膜進行形態(tài)學觀察及表面生物膜的細菌進行計數(shù)并對照。2.將制備好的樣品復合物涂層放入胎牛血清中用ICP-NS(英國Agiilent公司)來檢測并測試其釋放的速率,同時將樣品同樣的方法放置在空氣中12周后重新進行進行檢測。同時測量表皮葡萄球菌粘附分子的atle的表達 結果: 不含銀的復合物體在12小時左右已經(jīng)出現(xiàn)了成熟的表皮葡萄球菌生物膜,載銀納米復合物表面48小之后才出現(xiàn)表皮葡萄球菌生物膜,同時將載銀納米涂層與羥基磷石灰石的樣本表面涂層的粘附菌表面的量差異經(jīng)行比較,具有統(tǒng)計學意義(p0.01)。 結論: 復合物具有銀后很顯著地改變了復合物涂層表面的活性,表皮葡萄球菌的粘附能力明顯下降。說明載銀納米復合物涂層具有明確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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