ArticleMikrochimica acta2025
Enhanced sensitivity detection via orientational labelling of SPA-functionalized magnetic nanoparticles in lateral-flow immunoassays.
Article in Mikrochimica acta, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Mycoplasma pneumonia, a primary aetiological agent of atypical pneumonia, necessitates the implementation of rapid point-of-care diagnostics. Lateral flow immunoassays (LFIAs) hold promise for point-of-care testing (POCT), yet their sensitivity levels are frequently constrained by probe affinity and matrix interference. We introduce an orientational labelling strategy that employs magnetic nanoparticles (MNPs) functionalized with staphylococcal protein A (SPA) to simultaneously enhance antibody orientation and facilitate magnetic enrichment. The SPA-MNPs were synthesized via aggregation‒precipitation crosslinking, utilizing the Fc-binding specificity of SPA to enable oriented antibody conjugation and reduce steric hindrance. The oriented probe demonstrated robust stability, exceptional specificity, and enhanced binding affinity, which were considered crucial for the detection of low-abundance targets. In concentration gradient tests, the orientational labelling method resulted in the lowest visible colorimetric signals at 10
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