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Sensitivity improvement of rapid Vibrio harveyi detection with an enhanced chemiluminescent‐based dot blot
Author(s) -
Li H.,
Xiao J.,
Zhou Y.,
Wang Q.,
Zhang Y.
Publication year - 2017
Publication title -
letters in applied microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.698
H-Index - 110
eISSN - 1472-765X
pISSN - 0266-8254
DOI - 10.1111/lam.12763
Subject(s) - vibrio harveyi , dot blot , western blot , chemiluminescence , pathogen , microbiology and biotechnology , biology , detection limit , vibrio , chemistry , virology , bacteria , chromatography , biochemistry , gene , genetics
Vibrio harveyi is an opportunistic pathogen in seawater and can cause severe vibriosis. It is prevalent in hatcheries worldwide and can lead to severe economic losses. Therefore, there is an urgent need to develop a rapid detection method for monitoring this pathogen. In this study, to increase the detection sensitivity of our assay with monoclonal antibodies (Mabs) against V. harveyi , the conditions of the dot blot assay were optimized, and enhanced chemiluminescent ( ECL ) substrate replaced the traditional tetramethylbenzidine ( TMB ) substrate. Based on the optimization results, an ECL ‐based novel dot blot assay was developed for the rapid and sensitive detection of V. harveyi . Compared with the traditional dot blot assay, the incubation time was shortened from 8 to 2 h. The limit of detection ( LOD ) for V. harveyi was 2 × 10 5 CFU per ml (10 3 CFU per spot) in pure bacterial suspension, which was 50‐fold more sensitive than the traditional dot blot assay (1 × 10 7 CFU per ml). Furthermore, when compared with indirect ELISA , the dot blot assay showed approximately 1000‐fold higher sensitivity ( CFU / CFU ). After the test sample was pre‐enriched in turbot homogenates for 6 h before the dot blot analysis, the LOD for V. harveyi was 10 CFU per ml. Significance and Impact of the Study Vibrio harveyi is one of the most opportunistic pathogens that can cause high mortality in hatcheries worldwide. To detect this pathogen, a novel dot blot based on enhanced chemiluminescent ( ECL ) has been established. This ECL ‐based dot blot was found to be more sensitive and rapid for V. harveyi detection than traditional dot blot, and this technology is recommended as an applied protocol for monitoring V. harveyi in seawater to reduce economic losses.