Title:Simultaneous Detection of Pathogenic Bacteria Using Agglutination Test Based on Colored Silica Nanoparticles
Volume: 16
Issue: 8
Author(s): Hui Yu, Guangying Zhao and Wenchao Dou
Affiliation:
Keywords:
Agglutination test, colored silica nanoparticals, E. sakazakii, pathogenic bacteria, S. pullorum and S. gallinarum.
Abstract: Aimed to explore an agglutination test which can simultaneously detect two pathogenic bacteria,
an agglutination test based on colored silica nanoparticles (colored-SiNps) was established in this
work. Monodisperse colored-SiNps were used as agglutination test carriers; red-SiNps and blue-SiNps
were prepared by reverse microemulsion with C.I. Reactive red 136 and C.I. Reactive Blue 14. Then
the red-SiNps were sensitized with antibodies against E. sakazaki and denoted as IgG-red-SiNps; The
blue-SiNps were coated with antibodies against S. pullorum and S. Gallinarum and denoted as IgGblue-
SiNps. The mixture solution of IgG-red-SiNps and IgG-blue-SiNps could simultaneously agglutinate
with E. sakazakii and S. pullorum and S. gallinarum on glass slide. The E. sakazakii and S. pullorum and
S. gallinarum could be simultaneously detected by agglutination test with obvious agglutination phenomena. The E. sakazakii
and S. pullorum and S. gallinarum could both be detected in a range from 4×103 to 4×109 CFU/mL. The pullorum
and S. gallinarum and E. sakazakii in the infected food sample were detected by mixture solution of IgG-red-SiNps and
IgG-blue-SiNps too. This agglutination test was easy and rapid, it might be useful for in situ rapid detection method for
simultaneously screening different pathogenic microorganisms of foods and feeds in the field.
