Rapid detection of Salmonella in food and feed by coupling loop-mediated isothermal amplification with bioluminescent assay in real-time

被引:48
作者
Yang, Qianru [1 ,2 ]
Domesle, Kelly J. [1 ]
Wang, Fei [1 ,3 ]
Ge, Beilei [1 ]
机构
[1] US FDA, Ctr Vet Med, Res Off, Div Anim & Food Microbiol, Laurel, MD 20708 USA
[2] Louisiana State Univ, Ctr Agr, Dept Food Sci, Baton Rouge, LA 70803 USA
[3] Univ Maryland, Dept Nutr & Food Sci, College Pk, MD 20742 USA
来源
BMC MICROBIOLOGY | 2016年 / 16卷
关键词
LAMP; BART; Salmonella; Food; Feed; Detection; POLYMERASE-CHAIN-REACTION; IN-GROUND BEEF; FOODBORNE SALMONELLA; PCR; LAMP; SEROVARS; CONTAMINATION; PREVALENCE; MONOAZIDE; PRODUCE;
D O I
10.1186/s12866-016-0730-7
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Background: Salmonella is among the most significant pathogens causing food and feed safety concerns. This study examined the rapid detection of Salmonella in various types of food and feed samples by coupling loop-mediated isothermal amplification (LAMP) with a novel reporter, bioluminescent assay in real-time (BART). Performance of the LAMP-BART assay was compared to a conventional LAMP and the commercially available 3M Molecular Detection Assay (MDA) Salmonella. Results: The LAMP-BART assay was 100 % specific among 178 strains (151 Salmonella and 27 non-Salmonella) tested. The detection limits were 36 cells per reaction in pure culture and 10(4) to 10(6) CFU per 25 g in spiked food and feed samples without enrichment, which were comparable to those of the conventional LAMP and 3M MDA Salmonella but 5-10 min faster. Ground turkey showed a strong inhibition on 3M MDA Salmonella, requiring at least 10(8) CFU per 25 g for detection. The correlation between Salmonella cell numbers and LAMP-BART signals was high (R-2 = 0.941-0.962), suggesting good quantification capability. After 24 h enrichment, all three assays accurately detected 1 to 3 CFU per 25 g of Salmonella among five types of food (cantaloupe, ground beef, ground turkey, shell eggs, and tomato) and three types of feed (cattle feed, chicken feed, and dry dog food) examined. However, 10(1) CFU per 25 g was required for cattle feed when tested by 3M MDA Salmonella. Conclusions: The Salmonella LAMP-BART assay was rapid, specific, sensitive, quantitative, and robust. Upon further validation, it may become a valuable tool for routine screening of Salmonella in various types of food and feed samples.
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页数:10
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