Abstract
Luminescent 50-nm silicon dioxide nanoparticles containing both types of rhodamine 6G (R; particles denoted R-SiO2) were synthesized by the sol–gel method. In the presence of Pb(Ac)2 as a heavy atom perturber the particle can emit the intense and stable room-temperature phosphorescence (RTP) signal of R on a polyamide membrane, with λ maxex /λ maxem =470/635 nm for R. Our research indicates that the specific immune reaction between goat-anti-human IgG antibody labeled with R-SiO2 and human IgG can be carried out quantitatively on a polyamide membrane, and the phosphorescence intensity was enhanced after the immunoreaction. Thus a new method for solid-substrate room-temperature phosphorescence immunoassay (SS-RTP-IA) for determination of human IgG was established on the basis of antibody labeled with the nanoparticles containing binary luminescent molecules. The linear range of this method is 0.0624–20.0 pg spot−1 of human IgG (corresponding to a concentration range of 0.156–50.0 ng mL−1, sample volume 0.40 μL spot−1). The regression equations of the working curves are ΔIp=71.27+7.208mIgG (pg spot−1) (r=0.9996). Detection limits calculated as 3Sb/k are 0.022 pg spot−1. Compared with the same IA using fluorescein isothiocyanate (FITC) as the marker the new method was more sensitive and had a wider linear range. After elevenfold replicate measurement RSD are 4.5 and 3.6% for samples containing 0.156 and 50.0 ng mL−1 IgG, respectively. This method is sensitive, accurate, and of high precision.
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Acknowledgements
This work was supported by the Chinese National Natural Science Foundation (Grant No. 20175011) and Fujian Province Natural Science Foundation (Grant No. C0110028).
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Liu, JM., Yang, TL., Liang, XS. et al. Determination of human IgG by solid-substrate room-temperature phosphorescence immunoassay based on an antibody labeled with nanoparticles containing rhodamine 6G luminescent molecules. Anal Bioanal Chem 380, 632–636 (2004). https://doi.org/10.1007/s00216-004-2767-y
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DOI: https://doi.org/10.1007/s00216-004-2767-y