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Lu Chen,1 Shan-Yong Zhou,2 Wei Zhu,3 Sheng-Ping Liu,4 Jing-Xi Zhang,5 He Zhuang,5 Jing-Ling Zhang,5 Yong-Sheng Li,6 Fei Gao4 1Department of paediatrics, Fujian Maternity and Child Health Hospital, Fuzhou, 350000, Peopleâs Republic of China; 2Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, Peopleâs Republic of China; 3Department of Urology, Fujian Provincial Hospital, Shengli Clinical Medical College of Fujian Medical University, Fuzhou, 350001, Peopleâs Republic of China; 4Fujian Institute of Hematology, Fujian Provincial Key Laboratory on Hematology, Fujian Medical University Union Hospital, Fuzhou, 350001, Peopleâs Republic of China; 5Department of Clinical Laboratory, Fujian Medical University Union Hospital, Fuzhou, 350001, Peopleâs Republic of China; 6Department of Urology, Fujian Medical University Union Hospital, Fuzhou, 350001, Peopleâs Republic of ChinaCorrespondence: Fei Gao; Yongsheng Li, Tel/Fax +86 591-83357896-8242, Email xuzhougaofei@126.com; Lysdr163@163.comIntroduction: Cardiac troponin I (cTnI) has been regarded as a gold standard for early diagnosis and prognosis monitoring of acute myocardial infarction (AMI) in clinical practice. Owing to its low concentration in blood, accurate determination of cTnI often requires high sensitivity. However, current established point-of-care (POC) assays are insufficient to meet clinically analytical requirements due to their low sensitivity.Methods: To this end, we established a highly sensitive and reliable POC lateral flow strip based on lanthanide-doped nanoparticles (NPs) for cTnI determination in human blood samples. The capture of cTnI on the lateral flow strip was performed in a sandwich assay, where Eu3+-doped vanadate nanoparticles (GdVO4:30% Eu NPs) were used as luminescent probes to allow quantification.Results: Our platform realized the analytical sensitivity enhancement with limit-of-detection (LOD) as low as 17 pg mLâ 1 for cTnI detection, which was lower than the commercial counterpart; meanwhile, it displayed high specificity, excellent reproducibility and outstanding accuracy for analyzing clinical serum samples.Conclusion: Overall, this strategy provided an ultrasensitive, cost-effective and user-friendly platform for on-site cTnI detection, demonstrating the prospect of lanthanide-doped NPs-based POC diagnosis of disease-related biomarkers.Keywords: cardiac troponin I, GdVO4:30% Eu NPs, lateral flow test strip, point-of-care test |
