肝癌成長因子(HDGF)已經被證實與惡性腫瘤有著密不可分的關係, 唯傳統的檢測技術過於繁瑣,難以達到快速檢測之要求。本論文利用自 行合成的高度螢光性質金/聚亞胺奈米複合材料修飾拋棄式網板印刷電 極表面,做為製備HDGF免疫感測器之基礎,最後成功開發出製備方式 簡易、操作便利且價格低廉之HDGF免疫感測器。 本實驗利用金屬鹽類與聚胺類高分子於醇類環境下,一鍋式(one pot) 製備具藍色螢光特性之金/聚亞胺奈米材料(AuPiC0),螢光量子產率為 13.2%。TEM檢測結果顯示此複合材料之金奈米粒子平均粒徑約為 4.9 ± 1.9nm。透過系列實驗印證,本文推測此材料之螢光涵蓋兩種來源,一 為金奈米粒子,二為覆蓋於金奈米粒子上具亞胺鍵之高分子,且二者之 組合具有增強螢光表現之綜效。 最後利用AuPiC0修飾拋棄式網版印刷電極表面,逐層組裝出無標記 式之HDGF免疫感測器,結果顯示HDGF於1至35ng/mL濃度範圍與DPV 感測電流間具有線性關係,其檢量線回歸方程式為電流密度(μA/cm2) = 102.67C(ng/mL)-7526,R2值可達到0.996(n=5 , RSD<4%)。
Overexpression of hepatoma-derived growth factor (HDGF) has been confirmed to be related to the transformation of human hepatoma, lung cancer and melanoma. Many researches have shown that there is a close relationship between the concentration of HDGF and the malignant tumor metastasis recovery. However, the measurement of HDGF is always a complicated task. Herein, we present a disposable immunosensor for HDGF detection based on a imine-capped gold nanoparticles (AuPiC0) modified screen-printed carbon electrode (SPCE). AuPiC0 was first prepared through a straightforward, one-pot process, followed by mixing with polyethyleneimine to form a nanocomposite used for electrode surface modification. The electrochemical response of the fabricated electrode as a function of HDGF concentrations exhibits a linear range from 1 ng/mL to 35 ng/mL and a sensitivity of 102.7 μA(ng/mL)-1 cm-2 at a regression coefficient of 0.996. The obtained immunosensor displays a wide range of linear response, good reproducibility and stability with a very cost effective way, indicating its promising potential for clinical immunoassays.