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Ramos-Gómez S, Busto MD, Ortega N. Detection of Hazelnut and Almond Adulteration in Olive Oil: An Approach by qPCR. Molecules 2023; 28:molecules28104248. [PMID: 37241987 DOI: 10.3390/molecules28104248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Revised: 05/19/2023] [Accepted: 05/20/2023] [Indexed: 05/28/2023] Open
Abstract
Virgin olive oil (VOO), characterized by its unique aroma, flavor, and health benefits, is subject to adulteration with the addition of oils obtained from other edible species. The consumption of adulterated olive oil with nut species, such as hazelnut or almond, leads to health and safety issues for consumers, due to their high allergenic potential. To detect almond and hazelnut in olive oil, several amplification systems have been analyzed by qPCR assay with a SYBR Green post-PCR melting curve analysis. The systems selected were Cora1F2/R2 and Madl, targeting the genes coding the allergenic protein Cor a 1 (hazelnut) and Pru av 1 (almond), respectively. These primers revealed adequate specificity for each of the targeted species. In addition, the result obtained demonstrated that this methodology can be used to detect olive oil adulteration with up to 5% of hazelnut or almond oil by a single qPCR assay, and with a level as low as 2.5% by a nested-qPCR assay. Thus, the present research has shown that the SYBR-based qPCR assay can be a rapid, precise, and accurate method to detect adulteration in olive oil.
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Affiliation(s)
- Sonia Ramos-Gómez
- Department of Biotechnology and Food Science, Area of Biochemistry and Molecular Biology, University of Burgos, Plaza Misael Bañuelos s/n, 09001 Burgos, Spain
| | - María D Busto
- Department of Biotechnology and Food Science, Area of Biochemistry and Molecular Biology, University of Burgos, Plaza Misael Bañuelos s/n, 09001 Burgos, Spain
| | - Natividad Ortega
- Department of Biotechnology and Food Science, Area of Biochemistry and Molecular Biology, University of Burgos, Plaza Misael Bañuelos s/n, 09001 Burgos, Spain
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2
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Costa J, Villa C, Mafra I. Quantitative Real-Time PCR for the Detection of Allergenic Species in Foods. Methods Mol Biol 2023; 2967:85-103. [PMID: 37608105 DOI: 10.1007/978-1-0716-3358-8_8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/24/2023]
Abstract
Food allergy is an increasing challenge to public health, with widespread global distribution. With no cure for this pathology, the food-allergic individuals are forced to adopt food eviction measurements, relying on label information to avoid consuming the offending foods. To safeguard these individuals, the analytical methods based on real-time PCR approaches are currently faced as excellent tools to verify labeling compliance, aiding industry and regulatory agencies to efficiently manage food allergen control programs. Therefore, this chapter intends to describe a protocol of real-time PCR to analyze allergenic food species. For method development, the main steps to be considered are (i) in silico sequence analysis and primer/hydrolysis probe design, (ii) preparation of calibrators (model foods containing the allergenic ingredient), (iii) efficient DNA extraction from complex food matrices, (iv) amplification by real-time PCR with hydrolysis probe (90-200 bp) targeting a highly specific DNA region (allergen-encoding gene), (v) sequencing PCR products for identity confirmation, and (vi) validation and application to commercial foods. Herein, a real-time PCR approach for the detection and quantification of cashew nut as an allergenic food is described as an example protocol, including all the steps for method development and validation.
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Affiliation(s)
- Joana Costa
- REQUIMTE-LAQV, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | - Caterina Villa
- REQUIMTE-LAQV, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | - Isabel Mafra
- REQUIMTE-LAQV, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal.
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3
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A novel single-tube nested real-time PCR method to quantify pistachio nut as an allergenic food: influence of food matrix. J Food Compost Anal 2022. [DOI: 10.1016/j.jfca.2022.105042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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4
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Wu B, Hu JS, Li Y. Development of an ultra-sensitive single-tube nested PCR assay for rapid detection of Campylobacter jejuni in ground chicken. Food Microbiol 2022; 106:104052. [DOI: 10.1016/j.fm.2022.104052] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 04/10/2022] [Accepted: 04/22/2022] [Indexed: 11/04/2022]
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5
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Single-tube nested real-time PCR versus normalised real-time PCR for the quantification of allergenic cashew nut in foods: Impact of thermal processing and matrix. Food Chem 2022; 397:133778. [PMID: 35908469 DOI: 10.1016/j.foodchem.2022.133778] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Revised: 07/22/2022] [Accepted: 07/22/2022] [Indexed: 11/22/2022]
Abstract
In this work, three allergen-encoding genes (Ana o 1, Ana o 2, Ana o 3) were investigated for the detection of cashew nut as an allergenic food. Normalised and single-tube nested real-time PCR approaches targeting the Ana o 2 or Ana o 3 genes are proposed and compared. Normalised real-time PCR detected 10 pg, while single-tube nested real-time PCR achieved 1 pg of cashew nut DNA. Single-tube nested real-time PCR targeting Ana o 3 allowed the best relative sensitivities (10 mg/kg cashew nut in dough/biscuit), being successfully validated regarding precision/accuracy. The normalised real-time PCR did not show acceptable accuracy for both targets. Sensitivity of single-tube nested real-time PCR was affected by the matrix (pasta), but not by thermal processing (dough/biscuit). Herein, two highly sensitive and specific single-tube nested real-time PCR targeting allergen-encoding genes are proposed for the first time as quantitative/validated tools for cashew nut analysis as an allergenic food.
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Abstract
This review provides a global overview on Rosaceae allergy and details the particularities of each fruit allergy induced by ten Rosaceae species: almond/peach/cherry/apricot/plum (Amygdaleae), apple/pear (Maleae), and raspberry/blackberry/strawberry (Rosoideae). Data on clinical symptoms, prevalence, diagnosis, and immunotherapies for the treatment of Rosaceae allergy are herein stated. Allergen molecular characterization, cross-reactivity/co-sensitization phenomena, the impact of food processing and digestibility, and the methods currently available for the Rosaceae detection/quantification in foods are also described. Rosaceae allergy has a major impact in context to pollen-food allergy syndrome (PFAS) and lipid transfer protein (LTP) allergies, being greatly influenced by geography, environment, and presence of cofactors. Peach, apple, and almond allergies are probably the ones most affecting the quality of life of the allergic-patients, although allergies to other Rosaceae fruits cannot be overlooked. From patients' perspective, self-allergy management and an efficient avoidance of multiple fruits are often difficult to achieve, which might raise the risk for cross-reactivity and co-sensitization phenomena and increase the severity of the induced allergic responses with time. At this point, the absence of effective allergy diagnosis (lack of specific molecular markers) and studies advancing potential immunotherapies are some gaps that certainly will prompt the progress on novel strategies to manage Rosaceae food allergies.
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Affiliation(s)
- Joana Costa
- REQUIMTE-LAQV, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | - Isabel Mafra
- REQUIMTE-LAQV, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
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7
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Tree Nuts and Peanuts as a Source of Beneficial Compounds and a Threat for Allergic Consumers: Overview on Methods for Their Detection in Complex Food Products. Foods 2022; 11:foods11050728. [PMID: 35267361 PMCID: PMC8909911 DOI: 10.3390/foods11050728] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2022] [Revised: 02/15/2022] [Accepted: 02/25/2022] [Indexed: 12/18/2022] Open
Abstract
Consumption of tree nuts and peanuts has considerably increased over the last decades due to their nutritional composition and the content of beneficial compounds. On the other hand, such widespread consumption worldwide has also generated a growing incidence of allergy in the sensitive population. Allergy to nuts and peanuts represents a global relevant problem, especially due to the risk of the ingestion of hidden allergens as a result of cross-contamination between production lines at industrial level occurring during food manufacturing. The present review provides insights on peanuts, almonds, and four nut allergens—namely hazelnuts, walnuts, cashew, and pistachios—that are likely to cross-contaminate different food commodities. The paper aims at covering both the biochemical aspect linked to the identified allergenic proteins for each allergen category and the different methodological approaches developed for allergens detection and identification. Attention has been also paid to mass spectrometry methods and to current efforts of the scientific community to identify a harmonized approach for allergens quantification through the detection of allergen markers.
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8
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Santana BN, Ferrari ED, Nakamura AA, Silva GSD, Meireles MV. Validation of a one-tube nested real-time PCR assay for the detection of Cryptosporidium spp. in avian fecal samples. REVISTA BRASILEIRA DE PARASITOLOGIA VETERINARIA = BRAZILIAN JOURNAL OF VETERINARY PARASITOLOGY : ORGAO OFICIAL DO COLEGIO BRASILEIRO DE PARASITOLOGIA VETERINARIA 2022; 31:e000522. [PMID: 35320826 PMCID: PMC9901886 DOI: 10.1590/s1984-29612022017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Accepted: 02/21/2022] [Indexed: 11/22/2022]
Abstract
The aim of this study was to validate a one-tube nested real-time PCR assay followed by genetic sequencing to detect and identify Cryptosporidium species and genotypes in birds. A total of 443 genomic DNA extracted from avian fecal samples were analyzed by one-tube nested real-time PCR and conventional nested PCR. By one-tube nested real-time PCR, 90/443 (20.3%) samples were positive for Cryptosporidium spp. In contrast, 36/443 (8.1%) samples were positive for Cryptosporidium spp. by conventional nested PCR. The analytical sensitivity test showed that one-tube nested real-time PCR detects approximately 0.5 oocyst (2 sporozoites) per reaction. An evaluation of analytical specificity did not reveal amplification of microorganisms that commonly present nonspecific amplification with primers used for the diagnosis of Cryptosporidium spp. The repeatability analysis showed the same result in 27 out of 30 samples (90%). As for the reproducibility of one-tube nested real-time PCR, 24 of the 30 samples examined (80%) showed the same result. All the 90 samples amplified by one-tube real-time nested PCR were successfully sequenced, leading to the identification of C. baileyi, C. galli, C. meleagridis, C. proventriculi, and Cryptosporidium avian genotype I. Genetic sequencing of conventional nested PCR amplicons was successful in 10/36 (27.8%) of positive samples.
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Affiliation(s)
- Bruna Nicoleti Santana
- Faculdade de Medicina Veterinária, Universidade Estadual Paulista - UNESP, Araçatuba, SP, Brasil
| | - Elis Domingos Ferrari
- Faculdade de Medicina Veterinária, Universidade Estadual Paulista - UNESP, Araçatuba, SP, Brasil
| | - Alex Akira Nakamura
- Faculdade de Medicina Veterinária, Universidade Estadual Paulista - UNESP, Araçatuba, SP, Brasil
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Fu L, Qian Y, Zhou J, Zheng L, Wang Y. Fluorescence-based quantitative platform for ultrasensitive food allergen detection: From immunoassays to DNA sensors. Compr Rev Food Sci Food Saf 2020; 19:3343-3364. [PMID: 33337031 DOI: 10.1111/1541-4337.12641] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 08/12/2020] [Accepted: 09/01/2020] [Indexed: 01/10/2023]
Abstract
Food allergies are global health issue with an increasing prevalence that affect food safety; hence, food allergen detection, labeling, and management are considered to be important priorities in the food industry. In this critical review, we provide a comprehensive overview of several fluorescence-based platforms based on different biorecognition ligands, such as antibodies, DNA, aptamers, and cells, for food allergen quantification. Traditional analytical methods are generally unsuitable for food manufacturers to accomplish the real-time identification of food allergens in food products. Therefore, it is important to develop simple, rapid, inexpensive, accurate, and sensitive methods to improve user accessibility. A fluorescence-based quantitative platform provides an excellent detection platform for food allergens because of its high sensitivity. This review summarizes the traditional antibody-based fluorescent techniques for food allergen detection, such as the time-resolved fluoroimmunoassay , immunofluorescence imaging, fluorescence enzyme-linked immune sorbent assay, flow injection fluoroimmunoassay, and fluorescence immunosensors. However, these methods suffer from disadvantages such as the significant rate of false-positive and false-negative results due to antibody cross-reactivity with nontarget food components in the complex food matrix and epitope degradation during food processing. Hence, different types of fluorescence-based immunoassays are suitable for standardization and quantification of allergens in fresh foods. In addition, we summarize new fluorescence-based quantitative platforms, including fluorescence genosensors, fluorescence cell sensors, and fluorescence aptamer sensors. With the advantages of high sensitivity and simple operation, fluorescence biosensors will have great potential in the future and could provide portable methods for multiallergen real-time detection in complex food systems.
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Affiliation(s)
- Linglin Fu
- Food Safety Key Laboratory of Zhejiang Province, School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, People's Republic of China
| | - Yifan Qian
- Food Safety Key Laboratory of Zhejiang Province, School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, People's Republic of China
| | - Jinru Zhou
- Food Safety Key Laboratory of Zhejiang Province, School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, People's Republic of China
| | - Lei Zheng
- School of Food Science and Engineering, Hefei University of Technology, Hefei, People's Republic of China
| | - Yanbo Wang
- Food Safety Key Laboratory of Zhejiang Province, School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, People's Republic of China
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10
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Grazina L, Amaral JS, Mafra I. Botanical origin authentication of dietary supplements by DNA‐based approaches. Compr Rev Food Sci Food Saf 2020; 19:1080-1109. [DOI: 10.1111/1541-4337.12551] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 01/22/2020] [Accepted: 02/06/2020] [Indexed: 12/14/2022]
Affiliation(s)
- Liliana Grazina
- REQUIMTE‐LAQV, Faculdade de FarmáciaUniversidade do Porto Porto Portugal
| | - Joana S. Amaral
- Centro de Investigação de Montanha (CIMO)Instituto Politécnico de Bragança Bragança Portugal
| | - Isabel Mafra
- REQUIMTE‐LAQV, Faculdade de FarmáciaUniversidade do Porto Porto Portugal
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11
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Senyuva HZ, Jones IB, Sykes M, Baumgartner S. A critical review of the specifications and performance of antibody and DNA-based methods for detection and quantification of allergens in foods. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2019; 36:507-547. [PMID: 30856064 DOI: 10.1080/19440049.2019.1579927] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Despite the availability of a large number of antibody and DNA based methods for detection and quantification of allergens in food there remain significant difficulties in selecting the optimum technique to employ. Published methods from research groups mostly contain sufficient detail concerning target antigen, calibration procedures and method performance to allow replication by others. However, routine allergen testing by the food industry relies upon commercialised test kits and frequently the suppliers provide disappointingly little specification detail on the grounds that this is proprietary information. In this review we have made a critical assessment of the published literature describing the performance of both commercial and non-commercial test kits for food allergens over the period 2008-2018. Mass spectrometric methods, which have the potential to become reference methods for allergens, are not covered in this review. Available information on the specifications of commercial ELISA and LFD test kits are tabulated for milk, egg and peanut allergens, where possible linking to publications concerning collaborative studies and proficiency testing. For a number of commercial PCR test kits, specifications provided by manufacturers for detection of a small selection of allergen are tabulated. In conclusion we support the views of others of the critical need for allergen reference materials as the way forward to improve the comparability of different testing strategies in foods.
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Affiliation(s)
| | - Ivona Baricevic Jones
- b Institute of Inflammation and Repair , Manchester Institute of Biotechnology , Manchester , UK
| | - Mark Sykes
- c Fera Science Ltd , National Agri-Food Innovation Campus Sand Hutton , York , UK
| | - Sabine Baumgartner
- d Dept. IFA-Tulln, Center for Analytical Chemistry , BOKU Vienna , Tulln , Austria
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12
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Linacero R, Sanchiz A, Ballesteros I, Cuadrado C. Application of real-time PCR for tree nut allergen detection in processed foods. Crit Rev Food Sci Nutr 2019; 60:1077-1093. [PMID: 30638046 DOI: 10.1080/10408398.2018.1557103] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Currently, food allergies are an important health concern worldwide. The presence of undeclared allergenic ingredients or the presence of traces of allergens due to accidental contamination during food processing poses a great health risk to sensitized individuals. Therefore, reliable analytical methods are required to detect and identify allergenic ingredients in food products. Real-time PCR allowed a specific and accurate amplification of allergen sequences. Some processing methods could induce the fragmentation and/or degradation of genomic DNA and some studies have been performed to analyze the effect of processing on the detection of different targets, as thermal treatment, with and without applying pressure. In this review, we give an updated overview of the applications of real-time PCR for the detection of allergens of tree nut in processed food products. The different variables that contribute to the performance of PCR methodology for allergen detection are also review and discussed.
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Affiliation(s)
- Rosario Linacero
- Departamento de Genética, Fisiología y Microbiología, Facultad de Biología, Universidad Complutense de Madrid, Madrid, Spain
| | - Africa Sanchiz
- Departamento de Tecnología de Alimentos, SGIT-INIA, Madrid, Spain
| | - Isabel Ballesteros
- Ingeniería en Biotecnología, Facultad de Ingenierías y Ciencias Aplicadas, Universidad de las Américas, Quito, Ecuador
| | - Carmen Cuadrado
- Departamento de Tecnología de Alimentos, SGIT-INIA, Madrid, Spain
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13
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Sun Y, Chen J, Li J, Xu Y, Jin H, Xu N, Yin R, Hu G. Novel approach based on one-tube nested PCR and a lateral flow strip for highly sensitive diagnosis of tuberculous meningitis. PLoS One 2017; 12:e0186985. [PMID: 29084241 PMCID: PMC5662171 DOI: 10.1371/journal.pone.0186985] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Accepted: 10/11/2017] [Indexed: 12/24/2022] Open
Abstract
Rapid and sensitive detection of Mycobacterium tuberculosis (M. Tb) in cerebrospinal fluid is crucial in the diagnosis of tuberculous meningitis (TBM), but conventional diagnostic technologies have limited sensitivity and specificity or are time-consuming. In this work, a novel, highly sensitive molecular diagnostic method, one-tube nested PCR-lateral flow strip test (OTNPCR-LFST), was developed for detecting M. tuberculosis. This one-tube nested PCR maintains the sensitivity of conventional two-step nested PCR and reduces both the chance of cross-contamination and the time required for analysis. The PCR product was detected by a lateral flow strip assay, which provided a basis for migration of the test to a point-of-care (POC) microfluidic format. The developed assay had an improved sensitivity compared with traditional PCR, and the limit of detection was up to 1 fg DNA isolated from M. tuberculosis. The assay was also specific for M. tuberculosis, and no cross-reactions were found in other non-target bacteria. The application of this technique to clinical samples was successfully evaluated, and OTNPCR-LFST showed 89% overall sensitivity and 100% specificity for TBM patients. This one-tube nested PCR-lateral flow strip assay is useful for detecting M. tuberculosis in TBM due to its rapidity, high sensitivity and simple manipulation.
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Affiliation(s)
- Yajuan Sun
- Department of Neurology, the Second Hospital of Jilin University, Changchun, Jilin, China
- Department of Neurology, China-Japan Union Hospital of Jilin University, Changchun, Jilin, China
| | - Jiajun Chen
- Department of Neurology, China-Japan Union Hospital of Jilin University, Changchun, Jilin, China
| | - Jia Li
- Department of Neurology, China-Japan Union Hospital of Jilin University, Changchun, Jilin, China
| | - Yawei Xu
- College of Life Science, Jilin Agricultural University, Changchun, Jilin, China
| | - Hui Jin
- Department of Neurology, China-Japan Union Hospital of Jilin University, Changchun, Jilin, China
| | - Na Xu
- College of Life Science, Jilin Agricultural University, Changchun, Jilin, China
| | - Rui Yin
- College of Life Science, Jilin Agricultural University, Changchun, Jilin, China
- College of Biological Engineering, Jilin College of Agricultural Science and Technology, Jilin, Jilin, China
- * E-mail: (GHH); (RY)
| | - Guohua Hu
- Department of Neurology, the Second Hospital of Jilin University, Changchun, Jilin, China
- * E-mail: (GHH); (RY)
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Sharma GM, Khuda SE, Parker CH, Eischeid AC, Pereira M. Detection of Allergen Markers in Food: Analytical Methods. Food Saf (Tokyo) 2016. [DOI: 10.1002/9781119160588.ch4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
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15
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Costa J, Fernandes TJ, Villa C, P.P. Oliveira MB, Mafra I. Advances in Food Allergen Analysis. Food Saf (Tokyo) 2016. [DOI: 10.1002/9781119160588.ch9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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16
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Sanzani SM, Miazzi MM, di Rienzo V, Fanelli V, Gambacorta G, Taurino MR, Montemurro C. A Rapid Assay to Detect Toxigenic Penicillium spp. Contamination in Wine and Musts. Toxins (Basel) 2016; 8:E235. [PMID: 27509524 PMCID: PMC4999851 DOI: 10.3390/toxins8080235] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Revised: 07/29/2016] [Accepted: 08/04/2016] [Indexed: 12/03/2022] Open
Abstract
Wine and fermenting musts are grape products widely consumed worldwide. Since the presence of mycotoxin-producing fungi may greatly compromise their quality characteristics and safety, there is an increasing need for relatively rapid "user friendly" quantitative assays to detect fungal contamination both in grapes delivered to wineries and in final products. Although other fungi are most frequently involved in grape deterioration, secondary infections by Penicillium spp. are quite common, especially in cool areas with high humidity and in wines obtained by partially dried grapes. In this work, a single-tube nested real-time PCR approach-successfully applied to hazelnut and peanut allergen detection-was tested for the first time to trace Penicillium spp. in musts and wines. The method consisted of two sets of primers specifically designed to target the β-tubulin gene, to be simultaneously applied with the aim of lowering the detection limit of conventional real-time PCR. The assay was able to detect up to 1 fg of Penicillium DNA. As confirmation, patulin content of representative samples was determined. Most of analyzed wines/musts returned contaminated results at >50 ppb and a 76% accordance with molecular assay was observed. Although further large-scale trials are needed, these results encourage the use of the newly developed method in the pre-screening of fresh and processed grapes for the presence of Penicillium DNA before the evaluation of related toxins.
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Affiliation(s)
- Simona Marianna Sanzani
- Dipartimento di Scienze del Suolo, della Pianta e degli Alimenti, Università degli Studi di Bari Aldo Moro, Via G. Amendola 165/A, 70126 Bari, Italy.
| | - Monica Marilena Miazzi
- Dipartimento di Scienze del Suolo, della Pianta e degli Alimenti, Università degli Studi di Bari Aldo Moro, Via G. Amendola 165/A, 70126 Bari, Italy.
| | - Valentina di Rienzo
- Dipartimento di Scienze del Suolo, della Pianta e degli Alimenti, Università degli Studi di Bari Aldo Moro, Via G. Amendola 165/A, 70126 Bari, Italy.
- Sinagri s.rl. Spin-off, Università degli Studi di Bari Aldo Moro, Via G. Amendola 165/A, 70126 Bari, Italy.
| | - Valentina Fanelli
- Dipartimento di Scienze del Suolo, della Pianta e degli Alimenti, Università degli Studi di Bari Aldo Moro, Via G. Amendola 165/A, 70126 Bari, Italy.
- Sinagri s.rl. Spin-off, Università degli Studi di Bari Aldo Moro, Via G. Amendola 165/A, 70126 Bari, Italy.
| | - Giuseppe Gambacorta
- Dipartimento di Scienze del Suolo, della Pianta e degli Alimenti, Università degli Studi di Bari Aldo Moro, Via G. Amendola 165/A, 70126 Bari, Italy.
| | | | - Cinzia Montemurro
- Dipartimento di Scienze del Suolo, della Pianta e degli Alimenti, Università degli Studi di Bari Aldo Moro, Via G. Amendola 165/A, 70126 Bari, Italy.
- Sinagri s.rl. Spin-off, Università degli Studi di Bari Aldo Moro, Via G. Amendola 165/A, 70126 Bari, Italy.
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17
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Costa J, Amaral JS, Fernandes TJ, Batista A, Oliveira MBP, Mafra I. DNA extraction from plant food supplements: Influence of different pharmaceutical excipients. Mol Cell Probes 2015; 29:473-478. [DOI: 10.1016/j.mcp.2015.06.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Revised: 06/04/2015] [Accepted: 06/09/2015] [Indexed: 10/23/2022]
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18
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Costa J, Melo VS, Santos CG, Oliveira MBP, Mafra I. Tracing tree nut allergens in chocolate: A comparison of DNA extraction protocols. Food Chem 2015; 187:469-76. [DOI: 10.1016/j.foodchem.2015.04.073] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Revised: 04/15/2015] [Accepted: 04/18/2015] [Indexed: 10/23/2022]
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19
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de la Cruz S, Cubillos-Zapata C, López-Calleja IM, Ghosh S, Alcocer M, González I, Martín R, García T. Isolation of recombinant antibody fragments (scFv) by phage display technology for detection of almond allergens in food products. Food Control 2015. [DOI: 10.1016/j.foodcont.2015.02.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Yamaguchi A, Matsuda K, Sueki A, Taira C, Uehara M, Saito Y, Honda T. Development of a rapid and sensitive one-step reverse transcription-nested polymerase chain reaction in a single tube using the droplet-polymerase chain reaction machine. Clin Chim Acta 2015; 448:150-4. [PMID: 26148723 DOI: 10.1016/j.cca.2015.07.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Accepted: 07/02/2015] [Indexed: 11/25/2022]
Abstract
BACKGROUND Reverse transcription (RT)-nested polymerase chain reaction (PCR) is a time-consuming procedure because it has several handling steps and is associated with the risk of cross-contamination during each step. Therefore, a rapid and sensitive one-step RT-nested PCR was developed that could be performed in a single tube using a droplet-PCR machine. METHODS The K562 BCR-ABL mRNA-positive cell line as well as bone marrow aspirates from 5 patients with chronic myelogenous leukemia (CML) and 5 controls without CML were used. We evaluated one-step RT-nested PCR using the droplet-PCR machine. RESULTS One-step RT-nested PCR performed in a single tube using the droplet-PCR machine enabled the detection of BCR-ABL mRNA within 40min, which was 10(3)-fold superior to conventional RT nested PCR using three steps in separate tubes. The sensitivity of the one-step RT-nested PCR was 0.001%, with sample reactivity comparable to that of the conventional assay. CONCLUSIONS One-step RT-nested PCR was developed using the droplet-PCR machine, which enabled all reactions to be performed in a single tube accurately and rapidly and with high sensitivity. This one-step RT-nested PCR may be applicable to a wide spectrum of genetic tests in clinical laboratories.
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Affiliation(s)
- Akemi Yamaguchi
- Graduate School of Science and Technology, Shinshu University, Nagano, Japan; Core Technology Development Center, Seiko Epson Corporation, Suwa, Japan
| | - Kazuyuki Matsuda
- Department of Laboratory Medicine, Shinshu University Hospital, Matsumoto, Japan.
| | - Akane Sueki
- Department of Laboratory Medicine, Shinshu University Hospital, Matsumoto, Japan
| | - Chiaki Taira
- Department of Laboratory Medicine, Shinshu University Hospital, Matsumoto, Japan
| | - Masayuki Uehara
- Core Technology Development Center, Seiko Epson Corporation, Suwa, Japan
| | - Yasunori Saito
- Institute of Engineering, Academic Assembly, Shinshu University, Nagano, Japan
| | - Takayuki Honda
- Department of Laboratory Medicine, Shinshu University Hospital, Matsumoto, Japan
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Brežná B, Šmíd J, Costa J, Radvanszky J, Mafra I, Kuchta T. In silico and experimental evaluation of DNA-based detection methods for the ability to discriminate almond from other Prunus spp. Mol Cell Probes 2014; 29:99-115. [PMID: 25483259 DOI: 10.1016/j.mcp.2014.11.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Revised: 11/26/2014] [Accepted: 11/26/2014] [Indexed: 10/24/2022]
Abstract
Ten published DNA-based analytical methods aiming at detecting material of almond (Prunus dulcis) were in silico evaluated for potential cross-reactivity with other stone fruits (Prunus spp.), including peach, apricot, plum, cherry, sour cherry and Sargent cherry. For most assays, the analysis of nucleotide databases suggested none or insufficient discrimination of at least some stone fruits. On the other hand, the assay targeting non-specific lipid transfer protein (Röder et al., 2011, Anal Chim Acta 685:74-83) was sufficiently discriminative, judging from nucleotide alignments. Empirical evaluation was performed for three of the published methods, one modification of a commercial kit (SureFood allergen almond) and one attempted novel method targeting thaumatin-like protein gene. Samples of leaves and kernels were used in the experiments. The empirical results were favourable for the method from Röder et al. (2011) and a modification of SureFood allergen almond kit, both showing cross-reactivity <10(-3) compared to the model almond.
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Affiliation(s)
- Barbara Brežná
- Department of Microbiology and Molecular Biology, Food Research Institute, Priemyselná 4, P.O. Box 25, 824 75 Bratislava 26, Slovakia.
| | - Jiří Šmíd
- Department of Microbiology and Molecular Biology, Food Research Institute, Priemyselná 4, P.O. Box 25, 824 75 Bratislava 26, Slovakia; Institute of Food Chemistry and Biotechnolgy, Faculty of Chemistry, Brno University of Technology, Purkyňova 118, 612 00 Brno, Czech Republic
| | - Joana Costa
- REQUIMTE, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Rua de Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal
| | - Jan Radvanszky
- Institute of Molecular Physiology and Genetics, Slovak Academy of Sciences, Vlárska 5, 83334 Bratislava, Slovakia
| | - Isabel Mafra
- REQUIMTE, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Rua de Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal
| | - Tomáš Kuchta
- Department of Microbiology and Molecular Biology, Food Research Institute, Priemyselná 4, P.O. Box 25, 824 75 Bratislava 26, Slovakia
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Scientific Opinion on the evaluation of allergenic foods and food ingredients for labelling purposes. EFSA J 2014. [DOI: 10.2903/j.efsa.2014.3894] [Citation(s) in RCA: 72] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
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Costa J, Carrapatoso I, Oliveira MBPP, Mafra I. Walnut allergens: molecular characterization, detection and clinical relevance. Clin Exp Allergy 2014; 44:319-41. [PMID: 24382327 DOI: 10.1111/cea.12267] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Food-induced allergies have been regarded as an emergent problem of public health. Classified as important allergenic ingredients, the presence of walnut and other nuts as hidden allergens in processed foods constitutes a risk for sensitized individuals, being a real problem of allergen management. Attending to the increasing importance dedicated to walnut allergy, this review intends to provide the relevant and up-to-date information on main issues such as the prevalence of walnut allergy, the clinical threshold levels, the molecular characterization of walnut allergens and their clinical relevance, as well as the methodologies for walnut allergen detection in foods. As the walnut used in human diet comes from Juglans regia and Juglans nigra, the molecular characterization of the allergens from both species included in the prolamins (Jug r 1, Jug n 1 and Jug r 3), cupins (Jug r 2, Jug n 2 and Jug r 4) and profilins (Jug r 5), together with respective clinical relevance, were compiled in this review. The most recent progresses on walnut allergen detection techniques (protein- and DNA-based) are described and critically compared, including the emergent multitarget approaches.
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Affiliation(s)
- J Costa
- REQUIMTE, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
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Prieto N, Iniesto E, Burbano C, Cabanillas B, Pedrosa MM, Rovira M, Rodríguez J, Muzquiz M, Crespo JF, Cuadrado C, Linacero R. Detection of almond allergen coding sequences in processed foods by real time PCR. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2014; 62:5617-5624. [PMID: 24857239 DOI: 10.1021/jf405121f] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The aim of this work was to develop and analytically validate a quantitative RT-PCR method, using novel primer sets designed on Pru du 1, Pru du 3, Pru du 4, and Pru du 6 allergen-coding sequences, and contrast the sensitivity and specificity of these probes. The temperature and/or pressure processing influence on the ability to detect these almond allergen targets was also analyzed. All primers allowed a specific and accurate amplification of these sequences. The specificity was assessed by amplifying DNA from almond, different Prunus species and other common plant food ingredients. The detection limit was 1 ppm in unprocessed almond kernels. The method's robustness and sensitivity were confirmed using spiked samples. Thermal treatment under pressure (autoclave) reduced yield and amplificability of almond DNA; however, high-hydrostatic pressure treatments did not produced such effects. Compared with ELISA assay outcomes, this RT-PCR showed higher sensitivity to detect almond traces in commercial foodstuffs.
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Affiliation(s)
- Nuria Prieto
- Departamento de Genética, Facultad de Biología, Universidad Complutense de Madrid , 28040 Madrid, Spain
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López-Calleja IM, de la Cruz S, Pegels N, González I, Martín R, García T. Sensitive and specific detection of almond (Prunus dulcis) in commercial food products by real-time PCR. Lebensm Wiss Technol 2014. [DOI: 10.1016/j.lwt.2013.10.039] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Effect of thermal processing on the performance of the novel single-tube nested real-time PCR for the detection of walnut allergens in sponge cakes. Food Res Int 2013. [DOI: 10.1016/j.foodres.2013.09.047] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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