Simple and rapid detection of Listeria monocytogenes in fruit juice by real-time PCR without enrichment culture

The incidence of outbreaks of foodborne listeriosis has indicated the need for a reliable and rapid detection of the microbe in different foodstuffs. A method combining redox potential measurement and real-time polymerase chain reaction (PCR) was developed to detectListeria monocytogenesin artificially contaminated raw milk and soft cheese. Food samples of 25 g or 25 ml were homogenised in 225 ml of Listeria Enrichment Broth (LEB) with Oxford supplement, and the redox potential measurement technique was applied. ForListeriaspecies the measuring time was maximum 34 h. The absence ofL. monocytogenescould reliably be proven by the redox potential measurement method, butListeria innocuaandBacillus subtiliscould not be differentiated fromL. monocytogeneson the basis of the redox curves. The presence ofL. monocytogeneshad to be confirmed by real-time PCR. The combination of these two methods proved to detect < 10 cfu/g ofL. monocytogenesin a cost- and time-effective manner. This method can potentially be used as an alternative to the standard nutrient method for the rapid detection ofL. monocytogenesin food.

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Rapid detection of Listeria monocytogenes by nanoparticle-based immunomagnetic separation and real-time PCR

International Journal of Food Microbiology ◽

10.1016/j.ijfoodmicro.2007.06.019 ◽

2007 ◽

Vol 118 (2) ◽

pp. 132-138 ◽

Cited By ~ 137

Author(s):

Hua Yang ◽

Liangwei Qu ◽

Adrienne N. Wimbrow ◽

Xiuping Jiang ◽

Yaping Sun

Keyword(s):

Listeria Monocytogenes ◽

Real Time ◽

Real Time Pcr ◽

Rapid Detection ◽

Immunomagnetic Separation

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Rapid detection of Chlamydia/Chlamydophila group in samples collected from swine herds with and without reproductive disorders

Polish Journal of Veterinary Sciences ◽

10.2478/pjvs-2014-0052 ◽

2014 ◽

Vol 17 (2) ◽

pp. 367-369 ◽

Cited By ~ 3

Author(s):

K. Rypula ◽

A. Kumala ◽

P. Lis ◽

K. Niemczuk ◽

K. Płoneczka-Janeczko ◽

...

Keyword(s):

Real Time ◽

Real Time Pcr ◽

Rapid Detection ◽

Complement Fixation Test ◽

Complement Fixation ◽

Fixation Test ◽

Reproductive Disorders ◽

Serum Samples ◽

Swine Herds

Abstract The study was carried out in seven reproductive herds of pigs. In three of them reproductive disorders were observed. Three herds consisted of 10-50 and four consisted of 120-500 adult sows and they were called small and medium, respectively. Fifty-seven adult sows were randomly selected from herds. Serum samples were tested using the complement fixation test and swabs from both eyes and from the vaginal vestibule were examined using real-time PCR. All serum samples were negative. Infected sows were present in each of the study herds. In total, there were 28 positive samples (53%, 28/48) in real-time PCR in sows with reproductive disorders and 35 (53%, 35/66) in sows selected from herds without problems in reproduction. One isolate proved to be Chlamydophila pecorum, whereas all the remaining were Chamydia suis

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