Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/3947
標題: 以介電泳力量測牛頸動脈內皮細胞在不同生醫材料之貼附效果
Measurement of adhesive force of Bovine endothelial cells on different biomaterials by Dielectrophoresis
作者: Lin, Yi-Wei
林宜薇
關鍵字: dielectrophoretic force
介電泳
MEMS fabrication technique
cell adhesion
微製程技術
細胞貼附力
出版社: 生醫工程研究所
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摘要: Compared with the working medium, cell is easily to encounter an electric field induced polarization. Hence a positive dielectrophoretic force, which is generated due to an unbalanced electric field, will drive the cell toward the area of high electric field density. In this study, the finite element analysis software COMSOL is used to investigate the influence of an electric field on cell behavior for a better design of the dielectrophoretic electrode. Accordingly, a dielectrophoretic device that contains several micro electrodes for producing unbalanced electric field is fabricated using microelectromechanical fabrication technique. The proposed device is then used for the detection of cell adhesive force on PDMS and PLA. It is observed that those cells cultured on PDMS firmly stick on the material without any movement under the actions of different dielectrophoretic force. However, the dielectrophoretic force due to a 6 V applied potential is enough to move those cells having cultured on the PLA for 4 and 6 hr. When the culture period is increased to 8 hr, a higher applied potential of 16V is required to move the cells. The cells cultured on the PLA for 24 hr are not relaxed by the dielectrophoretic force even a higher potential is applied. Theoretically, a higher applied voltage can induce a larger driving force to move the cultured cells. For the PLA scaffold, a higher potential is required to move those cells having longer culture time. While for the PDMA scaffold, the cells cultured on it have a much higher adhesive force such that the dielectrophoretic force generated by the proposed device cannot lift the cells from the scaffold. A higher applied potential results in the unwanted cell lysis. The contact angles of PDMS and PLA are measured to be 92.21and 83.11, respectively. It indicates that the PLA surface is more hydrophilic than PDMS. In general, cells should have a better adhesion on PLA scaffold. However, the experimental results in this study reveal that cells have better adhesion on the PDMS scaffold. It is presumed that other properties of the scaffold influence the cell adhesion more than its hydrophilic-hydrophobic property.
由於細胞相較於工作溶液易受到電場誘導產生偏極化,在不均勻電場作用下會產生正介電泳力,進而趨向強電場方向移動。本研究利用COMSOL有限元素分析模擬軟體進行電場模擬做為探討細胞受電場影響變化與最佳化電極設計之依據,再以微製程技術製作出不規則形狀電極,藉此產生不均勻強度之電場來驅動細胞移動,進而脫離基材,藉此方式量測培養於PDMS與PLA兩種不同生醫材料之細胞貼附力。 從介電泳量測結果發現培養在PDMS之細胞無論培養時間長短仍未有明顯移動現象;而培養在PLA之細胞於培養時間4、6小時,在低電壓(約6V)操作下細胞即產生移動;當培養時間至8小時,需要施加較高電壓(約16V)才可驅動細胞移動;培養24小時之細胞已不見移動現象。當施加越高電壓,表示驅動細胞之作用力越大,細胞貼附越佳,故隨著培養時間增加,細胞培養於PLA之貼附力增加。而培養於PDMS之細胞貼附已達一定程度,持續施加電壓仍無法造成細胞移動,反而造成細胞被裂解。 由材料之親疏水性量測結果可知,PDMS之接觸角為92.21度;PLA之接觸角為83.11度,顯示PLA比PDMS具有較佳的親水性,理論上PLA會有較佳細胞貼附情形。但由細胞培養之外觀與介電泳量測結果均顯示PDMS有較佳之貼附效果,推測材料之其他特性較親水性更能影響細胞之貼附。
URI: http://hdl.handle.net/11455/3947
其他識別: U0005-2607201123490400
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-2607201123490400
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