胶体金免疫层析法快速检测黄曲霉毒素B_1的研究

Study on Gold Immunochromatography Assay for Rapid Detection of Aflatoxin B_1

本文应用胶体金免疫层析技术,建立了一种快速检测食品中黄曲霉毒素B1的方法。采用柠檬酸三钠还原法制备胶体金颗粒,标记抗黄曲霉毒素B1单克隆抗体并喷于玻璃纤维上,黄曲霉毒素B1偶联抗原和二抗鼠抗驴分别结合于硝酸纤维膜上,依次将样本垫、胶金垫、硝酸纤维膜和吸水纸组装切割成胶体金试纸条并装入检测卡中。测试结果表明黄曲霉毒素B1快速检测试纸条的灵敏度为5ng/ml,检测时间为10min,批内和批间重复性为100%,假阳性率和假阴性率均为0。使用简单方便,非常适合现场快速检测黄曲霉毒素B1。

To establish a rapid assay for detection of aflatoxin B,, gold immunochromatography assay（GICA）was studied. Colloidal gold marked coupled with monoclonal antibody against aflatoxin B1 was jet sprayed onto the glass fiber. Aflatoxin B1- BSA and anti-donkey anti-mouse immunoglobulins were jet-positioned onto a nitrocellulose membrane. Sample pad, gold jed pad, nitrocellulose membrane and absorbent paper were assembled and cut into detecting card, respectively. The results showed that the sentitive standard of rapid assay for aflatoxin B, visual detection limit is 5 ng/ml and detection time within 10 min. Repeatability of strip is 100%. The assay gives no false positive and false negative results. So it is very simple and convenient to rapidly detect aflatoxin B1 on the spot.