本研究利用具有超順磁特性的磁性奈米粒子,嘗試發展優異的高靈敏度與高穩定性磁性生物探針。包覆介面活性劑(dextran)後的磁性奈米粒子,可在水溶液中均勻分佈,增加反應速率與與增加感測靈敏度。嘗試以本實驗團隊先前的研究成果為基礎,由磁性奈米粒子標記的生物素(biotin)檢測抗生物素(avidin)的研究開始,檢討並構想更少試劑浪費,更接近實際應用的免疫檢測系統。
參考酵素連結免疫吸附分析方法(enzyme linked immunosorbent assay, ELISA),設計一磁性標記(magnetic indicator)的生物探針(bioprobe)檢測系統,實驗中成功利用包覆磁性奈米粒子的葡聚醣與鍊脢抗生物素(streptavidin)結合,再透過鍊脢抗生物素與生物素之間強大的結合力,與生物素鍊結anti VCAM-1抗體(biotin conjugated anti VCAM-1)組成生物探針。經過嚴密的驗證各個結合部位的結合比例後,最後在實地的活體外(in vitro)實驗中,測量出不同細胞數目下表現出的ICAM-1黏附蛋白質,且與傳統的ELISA檢測方法做一對照比較。初步的實驗結果顯示,磁性奈米粒子免疫檢測法確實具有與目前的ELISA法匹敵或超越它的檢測靈敏度。
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