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Negi A, Lakshmi P, Praba K, Meenatchi R, Pare A. Detection of Food Adulterants in Different Foodstuff. Food Chem 2021. [DOI: 10.1002/9781119792130.ch5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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2
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Mansouri M, Fathi F, Jalili R, Shoeibie S, Dastmalchi S, Khataee A, Rashidi MR. SPR enhanced DNA biosensor for sensitive detection of donkey meat adulteration. Food Chem 2020; 331:127163. [DOI: 10.1016/j.foodchem.2020.127163] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2019] [Revised: 04/15/2020] [Accepted: 05/25/2020] [Indexed: 11/15/2022]
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3
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A novel multiplex xMAP assay for generic detection of avian, fish, and ruminant DNA in feed and feedstuffs. Appl Microbiol Biotechnol 2019; 103:4575-4584. [PMID: 31001745 DOI: 10.1007/s00253-019-09833-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 03/30/2019] [Accepted: 04/04/2019] [Indexed: 10/27/2022]
Abstract
The identification of animal species in feed and feedstuffs is important for detecting contamination and fraudulent replacement of animal components that might cause health and economic problems. A novel multiplex assay, based on xMAP technology and the generic detection of closely related species, was developed for the simultaneous differential detection of avian, fish, and ruminant DNA in products. Universal primers and probes specific to avian, fish, or ruminant species were designed to target a conserved mitochondrial DNA sequence in the 12S ribosomal RNA gene (rRNA). The assay specificity was validated using samples of 27 target and 10 nontarget animal species. The limits of detection of the purified DNA were determined to be 0.2 pg/μL-0.1 ng/μL by testing the meat samples of six species and four feedstuffs. The detection sensitivity of the experimental mixtures was demonstrated to be 0.01% (weight percentage). The assay's suitability for practical application was evaluated by testing feed samples; unlabeled animal ingredients were detected in 32% of the 56 samples. The assay differentially detected the three targeted categories of animal species in less than 2 h, reflecting improvements in speed and efficiency. Based on these results, this novel multiplex xMAP assay provides a reliable and highly efficient technology for the routine detection of animal species in feed and other products for which this information is needed.
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Sánchez A, Quinteiro J, Vázquez JA, Perez-Martín RI, Sotelo CG. Comparison of real-time PCR methods for quantification of European hake (Merluccius merluccius) in processed food samples. Food Chem 2019; 272:279-285. [PMID: 30309545 DOI: 10.1016/j.foodchem.2018.08.031] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Revised: 07/29/2018] [Accepted: 08/08/2018] [Indexed: 11/16/2022]
Abstract
The quantification of species in commercial products is limited by analytical shortcomings, as most of them provide semiquantitative results. An exception is real-time PCR, which can provide quantitative results using hybridization probes. In the present work, this technique has been applied to the absolute, absolute-relative and relative quantification of the most valued hake species in European markets, Merluccius merluccius (European Hake). The best quantification results for this species in binary mixtures with non-target species (Merluccius capensis) and using a species-specific real-time PCR MMER_VIC system was achieved using a relative quantification approach (MLL as reference system). Absolute quantification using the MLL nuclear system has been demonstrated as appropriate for the quantification of the Merluccius genus in food model samples. This study reveals the impact of different reference systems (MLL and HAKE) in the absolute-relative and relative quantification approaches, showing that the nuclear MLL system performed better than the mitochondrial HAKE system.
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Affiliation(s)
- A Sánchez
- Instituto de Investigaciones Marinas, Consejo Superior de Investigaciones Científicas (CSIC), Eduardo Cabello 6, Vigo 36208, Pontevedra, Spain.
| | - J Quinteiro
- Departamento de Bioquímica y Biología Molecular, Facultad de Biología, Universidad de Santiago de Compostela, Santiago de Compostela 15782, A Coruña, Spain
| | - J A Vázquez
- Instituto de Investigaciones Marinas, Consejo Superior de Investigaciones Científicas (CSIC), Eduardo Cabello 6, Vigo 36208, Pontevedra, Spain
| | - R I Perez-Martín
- Instituto de Investigaciones Marinas, Consejo Superior de Investigaciones Científicas (CSIC), Eduardo Cabello 6, Vigo 36208, Pontevedra, Spain
| | - C G Sotelo
- Instituto de Investigaciones Marinas, Consejo Superior de Investigaciones Científicas (CSIC), Eduardo Cabello 6, Vigo 36208, Pontevedra, Spain
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Chu YW, Tang SS, Ma SX, Ma YY, Hao ZQ, Guo YM, Guo LB, Lu YF, Zeng XY. Accuracy and stability improvement for meat species identification using multiplicative scatter correction and laser-induced breakdown spectroscopy. OPTICS EXPRESS 2018; 26:10119-10127. [PMID: 29715952 DOI: 10.1364/oe.26.010119] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Accepted: 03/30/2018] [Indexed: 05/23/2023]
Abstract
An efficient method has been developed to identify meat species by using laser-induced breakdown spectroscopy (LIBS). To improve the accuracy and stability of meat species identification, multiplicative scatter correction (MSC) was adopted to first pretreat the spectrum for correction of spectrum scatter. Then the corrected spectra were identified by using the K-nearest neighbor (KNN) model. The results showed that the identification rate improved from 94.17% to 100% and the prediction coefficient of variance (CV) decreased from 5.16% to 0.56%. This means that the accuracy and stability of meat species identification using MSC and LIBS simultaneously improved. In light of the findings, the proposed method can be a valuable tool for meat species identification using LIBS.
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Šnirc M, Fekete T, Belej Ľ, Židek R, Golian J, Haščík P, Zajác P, Čapla J. Detection of ovine milk adulteration using taqman real-time pcr assay. POTRAVINARSTVO 2017. [DOI: 10.5219/782] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Food safety, quality and composition have become the subjects of increasing public concern. To prevent fraud and enhance quality assurance, credible analysis of dairy products is crucial. Bovine milk is more widely available and cheaper than milk of sheep and goat. Bovine milk is also processed in large quantities to produce a range of dairy produce. DNA-based methods have proven to be more reliable, because of the stability of DNA under the conditions of high temperature, high pressure, and chemical treatment used during the processing of some food products. The commercial InnuDETECT cheese assay based on the principle TaqMan real-time PCR systems have been tested for the identification and quantification of bovine DNA in ovine milk samples. DNA was extracted using the InnuPREP DNA Mini Kit and quantified by the QuantiFluor dsDNA system. The assay showed good linearity, with correlation coefficient of R2 = 0.983 and efficiency of 86%. The internal control amplified fragment from different mammalian species (cow, sheep and goat), with similar CT values. Detection of bovine DNA in milk mixtures was achieved even in samples containing 0.5% of bovine milk. The InnuDETECT cheese assay has been successfully used to measure bovine DNA in ovine milk, and will prove useful for bovine species identification and quantitative authentication of animal-derived products.
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Two alternative multiplex PCRs for the identification of the seven species of anglerfish (Lophius spp.) using an end-point or a melting curve analysis real-time protocol. Food Chem 2015; 166:1-9. [DOI: 10.1016/j.foodchem.2014.06.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2013] [Revised: 01/31/2014] [Accepted: 06/05/2014] [Indexed: 12/12/2022]
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Quantitative analysis of pork and chicken products by droplet digital PCR. BIOMED RESEARCH INTERNATIONAL 2014; 2014:810209. [PMID: 25243184 PMCID: PMC4163444 DOI: 10.1155/2014/810209] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Revised: 08/15/2014] [Accepted: 08/15/2014] [Indexed: 12/21/2022]
Abstract
In this project, a highly precise quantitative method based on the digital polymerase chain reaction (dPCR) technique was developed to determine the weight of pork and chicken in meat products. Real-time quantitative polymerase chain reaction (qPCR) is currently used for quantitative molecular analysis of the presence of species-specific DNAs in meat products. However, it is limited in amplification efficiency and relies on standard curves based Ct values, detecting and quantifying low copy number target DNA, as in some complex mixture meat products. By using the dPCR method, we find the relationships between the raw meat weight and DNA weight and between the DNA weight and DNA copy number were both close to linear. This enabled us to establish formulae to calculate the raw meat weight based on the DNA copy number. The accuracy and applicability of this method were tested and verified using samples of pork and chicken powder mixed in known proportions. Quantitative analysis indicated that dPCR is highly precise in quantifying pork and chicken in meat products and therefore has the potential to be used in routine analysis by government regulators and quality control departments of commercial food and feed enterprises.
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Köppel R, Daniels M, Felderer N, Brünen-Nieweler C. Multiplex real-time PCR for the detection and quantification of DNA from duck, goose, chicken, turkey and pork. Eur Food Res Technol 2013. [DOI: 10.1007/s00217-013-1973-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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López-Andreo M, Aldeguer M, Guillén I, Gabaldón JA, Puyet A. Detection and quantification of meat species by qPCR in heat-processed food containing highly fragmented DNA. Food Chem 2012. [DOI: 10.1016/j.foodchem.2012.02.111] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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11
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Montowska M, Pospiech E. Is Authentication of Regional and Traditional Food Made of Meat Possible? Crit Rev Food Sci Nutr 2012; 52:475-87. [DOI: 10.1080/10408398.2010.501408] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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12
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Development of real-time PCR assays for the detection of Atlantic cod (Gadus morhua), Atlantic salmon (Salmo salar) and European plaice (Pleuronectes platessa) in complex food samples. Eur Food Res Technol 2011. [DOI: 10.1007/s00217-011-1596-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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13
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PCR amplification of repetitive sequences as a possible approach in relative species quantification. Meat Sci 2011; 90:438-43. [PMID: 21944936 DOI: 10.1016/j.meatsci.2011.09.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2011] [Revised: 09/01/2011] [Accepted: 09/03/2011] [Indexed: 11/22/2022]
Abstract
Both relative and absolute quantifications are possible in species quantification when single copy genomic DNA is used. However, amplification of single copy genomic DNA does not allow a limit of detection as low as one obtained from amplification of repetitive sequences. Amplification of repetitive sequences is therefore frequently used in absolute quantification but problems occur in relative quantification as the number of repetitive sequences is unknown. A promising approach was developed where data from amplification of repetitive sequences were used in relative quantification of species in binary mixtures. PCR LUX primers were designed that amplify repetitive and single copy sequences to establish the species dependent number (constants) (SDC) of amplified repetitive sequences per genome. The SDCs and data from amplification of repetitive sequences were tested for their applicability to relatively quantify the amount of chicken DNA in a binary mixture of chicken DNA and pig DNA. However, the designed PCR primers lack the specificity required for regulatory species control.
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KARABASANAVAR NAGAPPAS, SINGH S, UMAPATHI V., KUMAR DEEPAK, SHEBANNAVAR SUNILN. IDENTIFICATION OF GOAT MEAT USING HIGHLY SPECIES-SPECIFIC POLYMERASE CHAIN REACTION. J FOOD QUALITY 2011. [DOI: 10.1111/j.1745-4557.2011.00376.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Köppel R, Ruf J, Rentsch J. Multiplex real-time PCR for the detection and quantification of DNA from beef, pork, horse and sheep. Eur Food Res Technol 2010. [DOI: 10.1007/s00217-010-1371-y] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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16
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Rojas M, González I, Pavón MA, Pegels N, Lago A, Hernández PE, García T, Martín R. Novel TaqMan real-time polymerase chain reaction assay for verifying the authenticity of meat and commercial meat products from game birds. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2010; 27:749-63. [PMID: 20169483 DOI: 10.1080/19440040903503070] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Species-specific real-time polymerase chain reaction (PCR) assays using TaqMan probes have been developed for verifying the labeling of meat and commercial meat products from game birds, including quail, pheasant, partridge, guinea fowl, pigeon, Eurasian woodcock and song thrush. The method combines the use of species-specific primers and TaqMan probes that amplify small fragments (amplicons <150 base pairs) of the mitochondrial 12S rRNA gene, and an endogenous control primer pair that amplifies a 141-bp fragment of the nuclear 18S rRNA gene from eukaryotic DNA. Analysis of experimental raw and heat-treated binary mixtures as well as of commercial meat products from the target species demonstrated the suitability of the assay for the detection of the target DNAs.
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Affiliation(s)
- María Rojas
- Departamento de Nutricion, Bromatologia y Tecnologia de los Alimentos, Facultad de Veterinaria, Universidad Complutense, 28040 Madrid, Spain
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Rojas M, González I, Pavón MA, Pegels N, Hernández PE, García T, Martín R. Polymerase chain reaction assay for verifying the labeling of meat and commercial meat products from game birds targeting specific sequences from the mitochondrial D-loop region. Poult Sci 2010; 89:1021-32. [PMID: 20371856 DOI: 10.3382/ps.2009-00217] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A PCR assay was developed for the identification of meats and commercial meat products from quail (Coturnix coturnix), pheasant (Phasianus colchicus), partridge (Alectoris spp.), guinea fowl (Numida meleagris), pigeon (Columba spp.), Eurasian woodcock (Scolopax rusticola), and song thrush (Turdus philomelos) based on oligonucleotide primers targeting specific sequences from the mitochondrial D-loop region. The primers designed generated specific fragments of 96, 100, 104, 106, 147, 127, and 154 bp in length for quail, pheasant, partridge, guinea fowl, pigeon, Eurasian woodcock, and song thrush tissues, respectively. The specificity of each primer pair was tested against DNA from various game and domestic species. In this work, satisfactory amplification was accomplished in the analysis of experimentally pasteurized (72 degrees C for 30 min) and sterilized (121 degrees C for 20 min) meats, as well as in commercial meat products from the target species. The technique was also applied to raw and sterilized muscular binary mixtures, with a detection limit of 0.1% (wt/wt) for each of the targeted species. The proposed PCR assay represents a rapid and straightforward method for the detection of possible mislabeling in game bird meat products.
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Affiliation(s)
- M Rojas
- Departamento de Nutrición, Bromatología y Tecnología de los Alimentos Facultad de Veterinaria, Universidad Complutense, 28040 Madrid, Spain
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Ballin NZ, Vogensen FK, Karlsson AH. Species determination – Can we detect and quantify meat adulteration? Meat Sci 2009; 83:165-74. [DOI: 10.1016/j.meatsci.2009.06.003] [Citation(s) in RCA: 168] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2009] [Revised: 05/28/2009] [Accepted: 06/01/2009] [Indexed: 10/20/2022]
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19
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Köppel R, Zimmerli F, Breitenmoser A. Heptaplex real-time PCR for the identification and quantification of DNA from beef, pork, chicken, turkey, horse meat, sheep (mutton) and goat. Eur Food Res Technol 2009. [DOI: 10.1007/s00217-009-1154-5] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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20
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Quantification of beef, pork, chicken and turkey proportions in sausages: use of matrix-adapted standards and comparison of single versus multiplex PCR in an interlaboratory trial. Eur Food Res Technol 2009. [DOI: 10.1007/s00217-009-1138-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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21
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Fajardo V, González I, Martín I, Rojas M, Hernández PE, García T, Martín R. Real-time PCR for detection and quantification of red deer (Cervus elaphus), fallow deer (Dama dama), and roe deer (Capreolus capreolus) in meat mixtures. Meat Sci 2008; 79:289-98. [DOI: 10.1016/j.meatsci.2007.09.013] [Citation(s) in RCA: 110] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2007] [Revised: 09/26/2007] [Accepted: 09/27/2007] [Indexed: 11/26/2022]
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22
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Martín I, García T, Fajardo V, Rojas M, Hernández PE, González I, Martín R. Real-time PCR for quantitative detection of bovine tissues in food and feed. J Food Prot 2008; 71:564-72. [PMID: 18389701 DOI: 10.4315/0362-028x-71.3.564] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A real-time PCR approach with the SYBR Green detection system has been developed for the quantitative detection of bovine tissues in food and feedstuffs. The method combines the use of bovine-specific primers, which amplify an 84-bp fragment of the mitochondrial 12S rRNA gene, and universal primers, which amplify a 140-bp fragment of the nuclear 18S rRNA gene from eukaryotic DNA. The 18S rRNA primers are used as endogenous controls for the total content of PCR-amplifiable DNA in the sample. The specificity of the primers was tested against 18 animal species, including mammals, birds, and fish, as well as 6 plant species. Analysis of experimental bovine tissues-oats mixtures demonstrated the suitability of the assay for the detection of bovine DNA in mixtures containing as low as 0.1% of bovine tissues. The performance of the method is not affected by severe heat treatment (up to 133 degrees C for 20 min at 300 kPa). The reported PCR assay could be very useful for detecting bovine-derived ingredients in raw and heat-treated food and feedstuffs.
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Affiliation(s)
- Irene Martín
- Departamento de Nutrición, Bromatología y Tecnología de los Alimentos, Facultad de Veterinaria, Universidad Complutense, 28040 Madrid, Spain
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Multiplex real-time PCR for the detection and quantification of DNA from beef, pork, chicken and turkey. Eur Food Res Technol 2008. [DOI: 10.1007/s00217-008-0837-7] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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24
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López-Calleja I, González I, Fajardo V, Martín I, Hernández P, García T, Martín R. Quantitative detection of goats’ milk in sheep’s milk by real-time PCR. Food Control 2007. [DOI: 10.1016/j.foodcont.2006.11.006] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Martín I, García T, Fajardo V, López-Calleja I, Rojas M, Hernández PE, González I, Martín R. Mitochondrial markers for the detection of four duck species and the specific identification of Muscovy duck in meat mixtures using the polymerase chain reaction. Meat Sci 2007; 76:721-9. [DOI: 10.1016/j.meatsci.2007.02.013] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2006] [Revised: 02/15/2007] [Accepted: 02/16/2007] [Indexed: 10/24/2022]
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Eugster A, Ruf J, Rentsch J, Hübner P, Köppel R. Quantification of beef and pork fraction in sausages by real-time PCR analysis: results of an interlaboratory trial. Eur Food Res Technol 2007. [DOI: 10.1007/s00217-007-0686-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Lopparelli RM, Cardazzo B, Balzan S, Giaccone V, Novelli E. Real-time TaqMan polymerase chain reaction detection and quantification of cow DNA in pure water buffalo mozzarella cheese: method validation and its application on commercial samples. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2007; 55:3429-34. [PMID: 17419643 DOI: 10.1021/jf0637271] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Mozzarella cheese obtained from buffalo (Bubalus bubalis) milk is a typical Italian product certificated by means of the European Protected Designation of Origin (PDO). Mozzarella cheese can also be obtained from bovine milk or bovine/buffalo milk mixtures, but in this case, it cannot be sold as PDO product, and its label must report the actual ingredients. However, bovine milk in PDO products was frequently detected in the past, suggesting fraudulent addition or accidental contamination. Several methods based on end-point polymerase chain reaction (PCR) have been profitably applied in a large number of tests to detect the presence of undeclared ingredients, also in dairy products. In the present study we report a real-time PCR method able to quantify bovine milk addition to pure buffalo cheese products. We validated a normalized procedure based on two targets: bovine mitochondrial cytochrome b (cyt b) to detect and quantify the bovine DNA and nuclear growth hormone (GH) gene used as a universal reference marker. With the use of this real-time PCR assay, 64 commercial mozzarella di bufala cheese samples purchased at local supermarkets, dairy shops, or directly from cheese manufacturers were analyzed. The results obtained demonstrate that most of the commercial samples were contaminated with bovine milk. Therefore, this assay could be conveniently employed to carry out routine and accurate controls aimed not only to discourage any fraudulent behavior but also to reduce risks for consumer health.
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Affiliation(s)
- Rosa M Lopparelli
- Dipartimento di Sanità Pubblica, Patologia Comparata e Igiene Veterinaria, Università di Padova, AGRIPOLIS 35020 Legnaro, Italy
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López-Andreo M, Garrido-Pertierra A, Puyet A. Evaluation of post-polymerase chain reaction melting temperature analysis for meat species identification in mixed DNA samples. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2006; 54:7973-8. [PMID: 17031997 DOI: 10.1021/jf0615045] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Real-time uniplex and duplex polymerase chain reaction (PCR) assays with a SYBR Green I post-PCR melting curve analysis were evaluated for the identification and quantification of bovine, porcine, horse, and wallaroo DNA in food products. Quantitative values were derived from threshold-cycle (C(t)) data obtained from serial dilutions of purified DNA. The limits of detection in uniplex reactions were 0.04 pg for porcine and wallaroo DNA and 0.4 pg for cattle and horse DNA. Species specificity of the PCR products was tested by the identification of peaks in DNA melting curves, measured as the decrease of SYBR Green I fluorescence at the dissociation temperature. The peaks could be distinguished above the background even at the lowest amount of template DNA detected by the C(t) method. The system was also tested in duplex reactions, by use of either single-species DNA or DNA admixtures containing different shares of two species. The minimum proportions of each DNA species allowing the resolution of T(m) peaks in the duplex reactions were 5% (cattle or wallaroo) in cattle/wallaroo mixtures, 5% porcine and 1% horse in porcine/horse mixtures, 60% porcine and 1% wallaroo in porcine/wallaroo mixtures, and 1% cattle and 5% horse in cattle/horse mixtures. A loss in the sensitivity of the method was observed for some DNA combinations in the duplex assay. In contrast, the results obtained from SYBR Green I uniplex and duplex reactions with single-species DNA were largely comparable to those obtained previously with species-specific TaqMan probes, showing the suitability of that simpler experimental approach for large-scale analytical applications.
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Affiliation(s)
- María López-Andreo
- Departamento de Bioquímica y Biología Molecular IV, Facultad de Veterinaria, Universidad Complutense de Madrid, 28040 Madrid, Spain
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31
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López-Andreo M, Lugo L, Garrido-Pertierra A, Prieto MI, Puyet A. Identification and quantitation of species in complex DNA mixtures by real-time polymerase chain reaction. Anal Biochem 2005; 339:73-82. [PMID: 15766713 DOI: 10.1016/j.ab.2004.11.045] [Citation(s) in RCA: 118] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2004] [Indexed: 11/27/2022]
Abstract
Six TaqMan real-time polymerase chain reaction (PCR) systems using minor groove binding (MGB) probes have been developed for the detection quantitation of bovine, porcine, lamb, chicken, turkey, and ostrich DNA in complex samples. Species-specific amplification was achieved by combining only two fluorogenic probes and 10 oligonucleotide primers targeting mitochondrial sequences, decreasing the cost of the assay significantly. The limits of detection ranged from 0.03 to 0.80 pg of template DNA. Analysis of experimental mixtures containing two to four different species showed the suitability of the assay for detection of more than 1% of pork, chicken, or turkey and of more than 5% of cattle or lamb. The quantitation accuracy in samples containing 10-100% of beef or pork DNA was close to 90%. The system is complemented with one additional TaqMan MGB detector based on consensus sequence segments of the nuclear 18S ribosomal RNA gene. A method to evaluate the presence of unknown eukaryotic DNA in a mixture, where data derived from the species-specific detection are compared with the experimental values obtained from the general 18S detector, is presented. This method allows the validation of the quantitative measurements, providing an internal control of the total content of PCR-amplifiable DNA in the sample. The system was tested on DNA mixtures containing different shares of up to four different species and on DNA extracted from processed commercial food samples.
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Affiliation(s)
- María López-Andreo
- Departamento de Bioquímica y Biología Molecular IV, Facultad de Veterinaria, Universidad Complutense de Madrid, 28040 Madrid, Spain
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Rodríguez MA, García T, González I, Hernández PE, Martín R. TaqMan real-time PCR for the detection and quantitation of pork in meat mixtures. Meat Sci 2005; 70:113-20. [DOI: 10.1016/j.meatsci.2004.12.005] [Citation(s) in RCA: 109] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2004] [Revised: 12/13/2004] [Accepted: 12/13/2004] [Indexed: 11/25/2022]
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Hird H, Chisholm J, Brown J. The detection of commercial duck species in food using a single probe-multiple species-specific primer real-time PCR assay. Eur Food Res Technol 2005. [DOI: 10.1007/s00217-005-1197-1] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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