Abstract
Functional bacterial enrichment magnetic beads (Fe3O4@SiO2@Fc-MBL) and Gram staining were combined for the fast diagnosis of infecting bacteria in meningitis. Fe3O4@SiO2@Fc-MBL has excellent microbial binding ability and can be used for bacterial enrichment from cerebrospinal fluid (CSF). The enriched bacteria are recognized by Gram stain at very low concentrations (10 CFU·mL−1). The feasibility of this method was verified by five common bacteria in meningitis infection (Gram-positive: Staphylococcus epidermidis, Staphylococcus haemolyticus, and Staphylococcus capitis; Gram-negative: Klebsiella pneumoniae and Escherichia coli). The extraction efficiency of Fc-MBL-modified Fe3O4 magnetic beads was approximately 90% in artificial CSF for the selected bacteria, with the exception of E. coli (~ 60%). The bacteria were successfully recognized by Gram staining and microscopic observation. Fe3O4@SiO2@Fc-MBL acts by capturing and fixing the bacteria in a magnetic field throughout the experiment. Compared with traditional CSF Gram staining, this new method avoids interference by inflammatory cells and red blood cells during microscopic examination. Furthermore, the sensitivity of this method is much better than the centrifugation smear method. The whole process can be accomplished within 30 min. This novel method may have potential as a clinical tool for analysis of bacteria in the CSF.
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This work was supported by Moutai Group Research and Development Project (No. 2018023) and National Natural Science Foundation of China (31470786).
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Material preparation, data collection and analysis were performed by Menghuan Yu, Li Zhang, and Guoqing Qian. The first draft of the manuscript was written by Menghuan Yu and all authors commented on previous versions of the manuscript. Shaoning Yu and Haimei Shi contributed to the study conception and design and took primary responsibility for communication with the journal during the manuscript submission, peer-review, and publication process. All authors read and approved the final manuscript.
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Yu, M., Zhang, L., Qian, G. et al. Fc-MBL-modified Fe3O4 magnetic bead enrichment and fixation in Gram stain for rapid detection of low-concentration bacteria. Microchim Acta 189, 169 (2022). https://doi.org/10.1007/s00604-022-05277-7
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DOI: https://doi.org/10.1007/s00604-022-05277-7