基于荧光碳点的免疫荧光探针构建及其对大肠杆菌的特异性识别

目的：将碳点（ CDs）应用在免疫荧光探针成为取代传统荧光染料的新型标记物。方法通过微波加热方法制备高强荧光碳点，并通过EDC偶联法与大肠杆菌抗体结合形成复合免疫荧光探针，以大肠杆菌O157∶H7为检测模型进行特异性识别实验。结果碳点成功应用在免疫标记大肠杆菌O157∶H7，并可见多色荧光。结论免疫荧光探针成功地识别大肠杆菌O157∶H7，表明碳点可作为免疫荧光探针的荧光标记物，有望制成具有自主知识产权的新型低毒生物传感器。

Immunofluorescence probe based on fluorescent carbon dots and its application to the special recognition of Escherichia coli

Objective Carbon dots (CDs) are an emerging carbon nano-material which is environmentally-friendly, economical , efficient and stable .Their fluorescence properties can match the semiconductor quantum dot .Moreover , CDs have more excellent biocompatibilities .The purpose of this experiment is to apply CDs to the fluorescent immune probe to make them a new label , which can replace the traditional fluorescent dyes .Methods Using microwave heating method , the high strength fluorescent carbon dots were prepared .Wtih the EDC coupling method , the high strength fluorescent car-bon dots could bond with Escherichia coli antibodies to form a complex immune fluorescent probe .Specific recognition exper-iments were carried out in the model of E.coli O157∶H7.Results CDs were successfully applied to immune recognition of E.coli O157∶H7 and multicolor fluorescence was observed .Conclusion CDs can serve as a label of the fluorescent im-mune probe , and are expected to become a new type of low toxicity biosensor with independent intellectual property rights .