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Peruzy M, Murru N, Smaldone G, Proroga Y, Cristiano D, Fioretti A, Anastasio A. Hygiene evaluation and microbiological hazards of hunted wild boar carcasses. Food Control 2022. [DOI: 10.1016/j.foodcont.2021.108782] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Cristiano D, Peruzy MF, Aponte M, Mancusi A, Proroga YTR, Capuano F, Murru N. Comparison of droplet digital PCR vs real-time PCR for Yersinia enterocolitica detection in vegetables. Int J Food Microbiol 2021; 354:109321. [PMID: 34225034 DOI: 10.1016/j.ijfoodmicro.2021.109321] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 06/18/2021] [Accepted: 06/21/2021] [Indexed: 11/30/2022]
Abstract
Yersiniosis - the 4th most commonly reported zoonosis in the European Union - is caused by the consumption of food contaminated with the bacterium Yersinia enterocolitica. The number of human cases and contaminated food samples is probably underestimated since conventional molecular methods currently proposed for Yersinia enterocolitica detection proved to have several limitations. Critical issues associated with the detection of Yersinia enterocolitica in meat and/or meat product has already been investigated, whereas data on the possible limits of the molecular methods for Yersinia enterocolitica detection in vegetables are still lacking. According to ISO method (ISO 18867:2015), real-time polymerase chain reaction (rtPCR) should be adopted for Yersinia enterocolitica detection, even if it proved to be affected by some biases. Recently, Droplet Digital PCR (ddPCR) has been introduced as a useful tool to detect and quantify different pathogenic bacteria in complex food matrices. However, its potential application for Yersinia enterocolitica detection in vegetables has never been investigated before. In the present study two molecular platforms (rtPCR and ddPCR) were used to evaluate the pathogen's behaviour in experimentally contaminated leafy greens (Lactuca sativa L.) and to assess the rate of detection achievable after the incubation for eleven days at different temperatures. By comparing, noticeable differences emerged between the two technical approaches: only ddPCR allowed the detection of the pathogen in leafy greens when contaminated at low levels. Moreover, results of the present work highlighted the importance of length and temperature of incubation on the survival and/or the growth of Yersinia enterocolitica in vegetables: at 18 and 25 °C the concentration of the pathogen considerably decreases along incubation. Based on data, the use of rtPCR leads to an underestimation of the true prevalence of pathogenic Y. enterocolitica in vegetables, while temperature and time currently proposed for Y. enterocolitica (25 °C for 24 h), allow optimizing detection. To conclude, ddPCR may be undoubtedly proposed as a reliable alternative strategy for the quick detection of the pathogen in food samples.
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Affiliation(s)
- D Cristiano
- Department of Food Microbiology, Istituto Zooprofilattico Sperimentale del Mezzogiorno, Via Salute, 2, 8055 Portici, NA, Italy
| | - M F Peruzy
- Department of Veterinary Medicine and Animal Production, University of Naples "Federico II", Via Delpino 1, 80137 Napoli, Italy.
| | - M Aponte
- Department of Agricultural Sciences, University of Naples 'Federico II', Via Università 100, Portici, NA, Italy
| | - A Mancusi
- Department of Food Microbiology, Istituto Zooprofilattico Sperimentale del Mezzogiorno, Via Salute, 2, 8055 Portici, NA, Italy
| | - Y T R Proroga
- Department of Food Microbiology, Istituto Zooprofilattico Sperimentale del Mezzogiorno, Via Salute, 2, 8055 Portici, NA, Italy
| | - F Capuano
- Department of Food Microbiology, Istituto Zooprofilattico Sperimentale del Mezzogiorno, Via Salute, 2, 8055 Portici, NA, Italy
| | - N Murru
- Department of Veterinary Medicine and Animal Production, University of Naples "Federico II", Via Delpino 1, 80137 Napoli, Italy; Task Force on Microbiome Studies, University of Naples Federico II, Naples, Italy
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Peruzy MF, Aponte M, Proroga YTR, Capuano F, Cristiano D, Delibato E, Houf K, Murru N. Yersinia enterocolitica detection in pork products: Evaluation of isolation protocols. Food Microbiol 2020; 92:103593. [PMID: 32950135 DOI: 10.1016/j.fm.2020.103593] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 05/26/2020] [Accepted: 06/30/2020] [Indexed: 12/18/2022]
Abstract
Conventional methods for Yersinia enterocolitica detection in food samples are generally considered inadequate. Problems arise from the presence of the so-called "background flora", coupled to the low contamination level of the pathogen. Since, data on the microbial ecology occurring in competitive microflora are still lacking, MALDI TOF MS was used for strains 'identification after enrichment in PSB or ITC broths, and after plating on selective CIN medium at different incubation times. SYBR Green Real time PCR was used for the Y. enterocolitica strains' detection (4/O:3, 1A/O:5) in experimentally contaminated foods, as well as in naturally contaminated samples. A higher number of different bacterial genera (10 on CIN and 18 on PCA) was recorded after enrichment in PSB, whilst enrichment in ITC led to recovery of 6 and 10 genera on CIN and PCA, respectively. Yersiniaceae was the dominant family on the first day of incubation, but on the second day the percentage of isolation considerably decreased. By testing experimentally contaminated samples, substantial difficulties were encountered. The biotype 1A was always detected, whereas strain 4/O:3 proved to be poorly competitive. Based on the data, the enrichment media PSB and ITC, currently proposed for Y. enterocolitica detection, need to be improved to promote a successful pathogen's recovery.
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Affiliation(s)
- M F Peruzy
- Department of Veterinary Public Health and Food Safety, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820, Merelbeke, Belgium; Department of Veterinary Medicine and Animal Production, University of Naples "Federico II", Via Delpino 1, 80137, Naples, Italy; Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, Karel Lodewijk Ledeganckstraat 35, Ghent, Belgium
| | - M Aponte
- Department of Agricultural Sciences, University of Naples 'Federico II', Via Università 100, Portici, 80055, Naples, Italy
| | - Y T R Proroga
- Department of Food Microbiology, Istituto Zooprofilattico Sperimentale del Mezzogiorno, Via Salute, 2, Portici, Naples, Italy.
| | - F Capuano
- Department of Food Microbiology, Istituto Zooprofilattico Sperimentale del Mezzogiorno, Via Salute, 2, Portici, Naples, Italy
| | - D Cristiano
- Department of Food Microbiology, Istituto Zooprofilattico Sperimentale del Mezzogiorno, Via Salute, 2, Portici, Naples, Italy
| | - E Delibato
- Department of Food Safety, Nutrition and Veterinary Public Health, Istituto Superiore di Sanità, Viale Regina Elena 299, Rome, Italy
| | - K Houf
- Department of Veterinary Public Health and Food Safety, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820, Merelbeke, Belgium; Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, Karel Lodewijk Ledeganckstraat 35, Ghent, Belgium
| | - N Murru
- Department of Veterinary Medicine and Animal Production, University of Naples "Federico II", Via Delpino 1, 80137, Naples, Italy
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Peruzy MF, Murru N, Yu Z, Kerkhof PJ, Neola B, Joossens M, Proroga YTR, Houf K. Assessment of microbial communities on freshly killed wild boar meat by MALDI-TOF MS and 16S rRNA amplicon sequencing. Int J Food Microbiol 2019; 301:51-60. [PMID: 31100642 DOI: 10.1016/j.ijfoodmicro.2019.05.005] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Revised: 05/06/2019] [Accepted: 05/06/2019] [Indexed: 12/22/2022]
Abstract
Wild boars (Sus scrofa) are the most widely distributed large mammals and recent increase in consumption of wild boar meat urges the need of microbiological quality criteria. The aim of the study was to characterize the initial bacterial contamination on freshly-killed wild boar meat using a culture-dependent approach with ISO-methods combined with matrix-assisted laser desorption/ionization time-of-flight mass spectrometry identification and 16S rRNA amplicon sequencing. Moreover, the presence of foodborne pathogens was examined using Real-Time-PCR and confirmed by classical isolation. Analysing 22 unrelated wild boar meat samples showed a higher bacterial contamination level compared to pork, with Salmonella present in almost one third of the samples. A great variability of the microbial contamination between the samples was recorded, as well as complementary results between culturing and 16S rRNA amplicon sequencing as frequently isolated genera were not always detected, and vice versa. Furthermore, the foodborne pathogen Salmonella was never detected with 16S rRNA amplicon sequencing, demonstrating the necessity for a cautious approach in the implementation of new analysis techniques in food safety. The present work determines that attention should be paid to the trade of non-inspected meat directly to retail or consumers.
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Affiliation(s)
- M F Peruzy
- Department of Veterinary Public Health and Food Safety, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium; Department of Veterinary Medicine and Animal Production, University of Naples "Federico II", Via Delpino 1, 80137 Napoli, Italy; Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, Karel Lodewijk Ledeganckstraat 35, Ghent, Belgium
| | - N Murru
- Department of Veterinary Medicine and Animal Production, University of Naples "Federico II", Via Delpino 1, 80137 Napoli, Italy.
| | - Z Yu
- Department of Veterinary Public Health and Food Safety, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium; Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, Karel Lodewijk Ledeganckstraat 35, Ghent, Belgium
| | - P-J Kerkhof
- Department of Veterinary Public Health and Food Safety, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium
| | - B Neola
- Istituto Zooprofilattico Sperimentale del Mezzogiorno, Via Salute, 2, Portici, NA, Italy
| | - M Joossens
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, Karel Lodewijk Ledeganckstraat 35, Ghent, Belgium
| | - Y T R Proroga
- Department of Food Microbiology, Istituto Zooprofilattico Sperimentale del Mezzogiorno, Via Salute, 2, Portici, NA, Italy
| | - K Houf
- Department of Veterinary Public Health and Food Safety, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium
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Peruzy M, Murru N, Yu Z, Cnockaert M, Joossens M, Proroga Y, Houf K. Determination of the microbiological contamination in minced pork by culture dependent and 16S amplicon sequencing analysis. Int J Food Microbiol 2019; 290:27-35. [DOI: 10.1016/j.ijfoodmicro.2018.09.025] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2018] [Revised: 09/14/2018] [Accepted: 09/28/2018] [Indexed: 12/22/2022]
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di Martino O, Troiano A, Addi L, Guarino A, Calabrò S, Tudisco R, Murru N, Cutrignelli MI, Infascelli F, Calabrò V. Regulation of Stearoyl Coenzyme A Desaturase 1 Gene Promoter in Bovine Mammary Cells. Anim Biotechnol 2016; 26:251-9. [PMID: 26158455 DOI: 10.1080/10495398.2015.1022182] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Stearoyl-Coenzyme A desaturase 1 (SCD1) belongs to the fatty acid family of desaturases. In lactating ruminants, the SCD1 protein is highly expressed in the mammary gland and is relevant for the fatty acid composition of milk and dairy products. Bovine mammary epithelial cells (BME-UV1), cultured in vitro, have been proposed as a model to reproduce the biology of the mammary gland. The present study was designed to investigate the responsiveness of bovine SCD1 promoter to serum, insulin, oleic acid, and NFY transcription factor in BME-UV1 cells. A luciferase-based reporter assay was used to monitor the transcriptional activity of the SCD1 promoter region in BME-UV1 cells treated or not with insulin and/or oleic acid. The level of endogenous SCD1 mRNA was evaluated by Real time PCR. Insulin (20 ng/mL) induced a 2.0 to 2.5-fold increase of SCD1 promoter activity. Additionally, the effect of insulin was inhibited by oleic acid, serum components, and NFY enforced expression. Serum and NFY showed no synergistic or additive effect on SCD1 promoter activity suggesting that they repress SCD1 transcription through the same responsive element.
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Affiliation(s)
- O di Martino
- a Department of Biology , University of Naples "Federico II" , Naples , Italy
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Mormile A, Barile M, Murru N, Björkroth KJ. CHARACTERIZATION OF AUTOCHTHONUS LACTIC FLORA OF A CAMPANIAN CHILLI CHEESE PRODUCED FROM RAW SHEEP MILK. Ital J Food Saf 2012. [DOI: 10.4081/ijfs.2012.4.77] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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D’Errico GE, Murru N. In-process estimation of time-variant contingently correlated measurands. Int J Metrol Qual Eng 2012. [DOI: 10.1051/ijmqe/2012021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
This paper is devoted to the study and implementation of real-time techniques for the estimation of time-varying, contingently correlated quantities, and relevant uncertainty. An estimation algorithm based on a metrological customization of the Kalman filtering technique is presented, starting from a Bayesian approach. Moreover, a fuzzy-logic routine for real-time treatment of possible outliers is incorporated in the overall software procedure. The system applicability is demonstrated by results of simulations performed on dimensional measurement models.
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Barile M, Mormile A, Mercogliano R, Murru N. ANTILISTERIAL ACTYVITY OF LACTIC ACID BACTERIA ISOLATED FROM GILTHEAD BREAMS AND SEA BASSES FILLETS PACKAGED MAP AGAINST PRIMITIVE STRAINS OF LISTERIA MONOCYTOGENES. Ital J Food Saf 2011. [DOI: 10.4081/ijfs.2011.1.23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Murru N, Mormile A, Barile M, Pezone G. RESARCH OF LISTERIA MONOCYTOGENES IN FOODS AND REFRIGERATORS OF PRIVATE HOSPITALS. Ital J Food Saf 2011. [DOI: 10.4081/ijfs.2011.1s.71] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Murru N, Barile M, Tozzi M, Ceres C, Aprea G, Cortesi M. EVALUATION OF LISTERIA MONOCYTOGENES IN RAW BUFFALO MILK DURING PRIMARY PRODUCTION. Ital J Food Saf 2009. [DOI: 10.4081/ijfs.2008.4.49] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Cortesi ML, Sarli T, Santoro A, Murru N, Pepe T. Distribution and behavior of Listeria monocytogenes in three lots of naturally-contaminated vacuum-packed smoked salmon stored at 2 and 10 degrees C. Int J Food Microbiol 1997; 37:209-14. [PMID: 9310856 DOI: 10.1016/s0168-1605(97)00064-0] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The incidence, the number and the behavior of L. monocytogenes in three lots of naturally-contaminated vacuum-packed sliced smoked salmon, processed in different plants, were investigated during storage at 2 and 10 degrees C. L. monocytogenes was isolated from 20 of the 100 packages stored at 2 degrees C (16 from lot 1, 1 from lot 2 and 3 from lot 3) and from 12 of the 65 packages stored at 10 degrees C (all from lot 1). The levels detected were 15, 20, 290, 1100 and > 1100 cfu/g in 5 packages, all belonging to lot 1, and < 10 cfu/g in the remaining samples. The high incidence of L. monocytogenes in lot 1 was assumed to be due mainly to the use of causal workers for the slicing and packing operations.
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Affiliation(s)
- M L Cortesi
- Department of Pathology, Prophylaxis and Food Inspection, Faculty of Veterinary Medicine, Napoli, Italy
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