For the rapid and highly sensitive detection of galactomannan(GM) in aspergillus,this study developed a biosensor(AuNIs-GM) based on a gold nanoparticle chip(AuNIs) and GM-specific antibodies. The changes of the resonance absorption peaks before and after the binding of GM to the biosensor were calculated using the principle of localized surface plasmon resonance(LSPR) in order to obtain the concentration of GM in the samples. The detection of different concentrations of GM indicates that the limit of detection(LOD) of the AuNIs-GM was 49.29 pg/mL,while the limit of quantification(LOQ) was 303.25 pg/mL. The recovery for labelled samples ranged from 91.6% to 105%, with a relative standard deviation of 0.55% to 5.8%, demonstrating high accuracy and precision. This methodology has been successfully applied to the analysis of bronchoalveolar lavage fluid samples. This study creatively applied LSPR technology to the detection of pathogenic bacteria of aspergillosis,and provided necessary technical support for the rapid detection of pathogenic bacteria of aspergillosis.
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