蓖麻毒素单抗制备及上转发光免疫层析定量检测方法研究

目的：建立一种可快速、精确地对蓖麻毒素（ RT）进行定量检测的上转发光免疫检测技术（ UPT-LF），即RT-UPT-LF。方法采用杂交瘤细胞技术制备蓖麻毒素单克隆抗体并对效价进行评价；采用效价最高的4种单抗分别与上转发光纳米颗粒（ UCP-NP）共价偶联，分别作为检测带，进而两两配伍，确定最优的配伍组合条件建立RT-UPT-LF方法；对RT-UPT-LF的敏感性、精密性、定量能力和特异性进行评价。结果与结论所建立的RT-UPT-LF方法可在15 min内完成对蓖麻毒素的检测，灵敏度可达0．5 ng／ml，定量范围为0．5～1000 ng／ml，与其他高浓度毒素无非特异反应，该法为蓖麻毒素检测提供了一种新手段。

Preparation of monoclonal antibodies against ricin toxin and development of up-converting phosphor technology-based lateral flow assay for its quantitative detection

Objective To develop an up-converting phosphor technology based lateral flow assay ( UPT-LF) to detect ricin toxin ( RT) quickly, accurately and quantitatively.Methods Ricin-monoclonal antibodies were prepared and their affinity was evaluated before four types of monoclonal antibodies with the highest titer were applied to couple with the up-converting phosphor nano-particles ( UCP-NPs) as the bio-conjugate and disperse on the analysis membrane as the test line, respectively.Following systematic optimization to establish the RT-UPT-LF strip, the sensitivity, precision, quantita-tive ability and specificity of RT-UPT-LF were evaluated.Results The detection could be accomplished within 15 min and the detection limit of the RT-UPT-LF assay could reach 0.5 ng/ml within the quantitative detection range of 0.5-1000 ng/ml.Other non-specific toxins at a concentration of 1000 ng/ml did not cause any non-specific reactions.Conclusion The developed RT-UPT-LF strip provides a new means for on-site quantitative detection of ricin toxin.