Current Microbiology

, Volume 70, Issue 2, pp 246–252 | Cite as

Development of Fluorescence-Based Liposome Immunoassay for Detection of Cronobacter muytjensii in Pure Culture

  • Xinjie Song
  • Shruti Shukla
  • Sejong Oh
  • Younghoan Kim
  • Myunghee KimEmail author


Cronobacter spp. are important foodborne pathogens that carry a very high risk of infection to neonates as well as immunocompromised individuals. In the present study, fluorescence-based liposome immunoassay was developed as a new sensitive and rapid diagnostic system for detection of Cronobacter muytjensii (C. muytjensii). Liposomes (size, 206 nm) used in this study were made from cholesterol, 1,2-dipalmitoyl-sn-glycero-3-phosphocholine, 1,2-dipalmitoyl-sn-glycero-3-phosphoethanolamine, 1,2-dipalmitoyl-sn-glycero-3-[phospho-rac-(1-glycerol)], and sulforhodamine B (SRB). The outer surface of liposome was conjugated with rabbit anti-C. muytjensii IgG in order to develop immunoliposome. The immunoliposome was incubated with C. muytjensii, which was coated on a 96-well plate. Immunoliposomes bound to C. muytjensii were lysed with 30 mM octyl β-d-glucopyranoside, after which the SRB fluorescence signal was measured at an excitation wavelength of 550 nm and emission wavelength of 585 nm. The signal was directly proportional to the amount of bacterial cells in the test sample. The developed fluorescence-based liposome immunoassay was confirmed to be highly specific to C. muytjensii with a detection limit of 6.3 × 104 CFU ml−1 in pure culture as well as sensitive, efficient, and rapid when compared to culture-based methods. Based on its rapid efficiency and low cost, this fluorescence-based liposome immunoassay may be used to develop diagnostic kits for C. muytjensii detection.


DPPC DPPE Ethylene Diamine Tetra Acetic Acid Ethylene Diamine Tetra Acetic Acid Diisopropyl Ether 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



This work was supported by the 2013 Yeungnam University research grant.


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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Xinjie Song
    • 1
  • Shruti Shukla
    • 1
  • Sejong Oh
    • 2
  • Younghoan Kim
    • 3
  • Myunghee Kim
    • 1
    Email author
  1. 1.Department of Food Science and TechnologyYeungnam UniversityGyeongsanRepublic of Korea
  2. 2.Division of Animal ScienceChonnam National UniversityGwangjuRepublic of Korea
  3. 3.Gyeongsangbuk-do Veterinary Service LaboratoryDaeguRepublic of Korea

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