中文摘要：

通过制备量子点荧光检测探针，构建了一种基于量子点探针和免疫磁珠的蛋白质检测方法，实现了对蛋白肿瘤标志物癌胚抗原（carcinoembryonic antigen，cEA）的高灵敏定量检测．在该检测体系中，若存在有靶标蛋白，其与量子点检测探针以及捕获探针之间会发生免疫反应形成三明治结构，利用磁力分离器对免疫复合物进行富集后，通过检测富集在磁珠表面的量子点荧光信号，可实现对靶标蛋白的定量．该方法的检测灵敏度为38pg／mL，线性范围为0．39～50ng／mL，临床质控样本检验结果表明，该方法准确度高，可重复性好，可应用于临床样本检测．该量子点探针检测体系具有灵敏度高、特异性好、样品消耗量低等优点，在疾病早期诊断方面具有广阔的应用前景．

英文摘要：

In this study, based on the unique properties of quantum dots （QDs） and immune magnetic beads, an fluorescent assay was built to detect low concentration carcinoembryonie antigen （CEA）. The assay was carried out in a sandwich formation in which two antibodies simultaneously recognized two separate binding sites on the same target CEA. After enrichment with magnetic separator, the fluorescent intensities produced by the QDs, which were confined to the surface of the beads, could be read efficiently to quantify the concentration of the CEA. For this assay, the limit of detection was 38 pg/mL with the linear range was from 0.39 to 50 ng/mL, and it has been proved with high accuracy and repeatability in tumor marker control. With the high sensitivity, specificity and low sample consumption, this method takes a big step to the early diagnosis of diseases.