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Zhu F, Yu H, Zhao Q. CRISPR/Cas12a-Amplified Aptamer Switch Microplate Assay for Small Molecules. Anal Chem 2024; 96:6853-6859. [PMID: 38646918 DOI: 10.1021/acs.analchem.4c01452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/23/2024]
Abstract
The presence of small molecule contaminants such as mycotoxins and heavy metals in foods and the environment causes a serious threat to human health and huge economic losses. The development of simple, rapid, sensitive, and on-site methods for small molecule pollutant detection is highly demanded. Here, combining the advantages of structure-switchable aptamer-mediated signal conversion and CRISPR/Cas12a-based signal amplification, we developed a CRISPR/Cas12a-amplified aptamer switch assay on a microplate for sensitive small molecule detection. In this assay, a short DNA strand complementary to the aptamer (cDNA) is immobilized on a microplate, which can capture the aptamer-linked active DNA probe (Apt-acDNA) in the sample solution when the target is absent. With the addition of the Cas12a reporter system, the captured Apt-acDNA probes activate Cas12a to indiscriminately cleave fluorescent DNA substrates, producing a high fluorescence signal. When the target is present, the Apt-acDNA probe specifically binds to the target rather than hybridizing with cDNA on the microplate, and the fluorescence signal is reduced. The analytical performance of our method was demonstrated by the detection of two highly toxic pollutants, aflatoxin B1 (AFB1) and cadmium ion (Cd2+), as examples. The assay exhibited good selectivity and high sensitivity, with detection limits of 31 pM AFB1 and 3.9 nM Cd2+. It also allowed the detection of targets in the actual sample matrix. With the general signal conversion strategy, this method can be used to detect other targets by simply changing the aptamer and cDNA, showing potential practical applications in broad fields.
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Affiliation(s)
- Fengxi Zhu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hao Yu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qiang Zhao
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- School of Environment, Hangzhou Institute for Advanced Study, UCAS, Hangzhou 310024, China
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2
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Souza TL, Souza LA, Barbosa IS, Santos DCMB, Araujo RGO, Korn MGA. Mineral and Trace Elements in Nutritious Flours: Total Contents, In Vitro Bioaccessibility and Contribution to Dietary Intake. Biol Trace Elem Res 2022:10.1007/s12011-022-03534-7. [PMID: 36562954 DOI: 10.1007/s12011-022-03534-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Accepted: 12/14/2022] [Indexed: 12/24/2022]
Abstract
The consumption of fruits, vegetables, and cereals in the form of flour has been an alternative for the intake of nutrients, currently seen in a society that seeks a healthier diet. Thus, the assessment of total contents and bioaccessibility is important to better understand the actual intake of nutrients or contaminants present in foods. The objective of this study was to determine the total content and estimate the bioaccessible fraction of Cu, Fe, and Zn in nutritious flours by inductively coupled plasma optical emission spectrometry (ICP OES) after microwave acid digestion. Bioaccessibility was assessed using the in vitro method, taking into account the entire gastrointestinal tract (Unified Bioaccessibility Method (UBM)). The following concentration ranges, in μg g-1, were found: Ca (341-6275), K (2984-13,953), P (476-6110), Na (< 0.39-2995), Fe (1.4-167), Cu (< 0.01-59.6), and Zn (< 0.07-30.3). Principal component analysis (PCA) and hierarchical cluster analysis (HCA) showed a tendency towards the formation of three groups. The bioaccessible fractions for Cu, Fe, and Zn were considered low, ranging from 0.96 to 40% in the gastrointestinal phase and from 4.1 to 100% in the gastric phase.
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Affiliation(s)
- Thaís L Souza
- Instituto de Química, Universidade Federal da Bahia, Campus Universitário de Ondina, Ondina, Salvador, Bahia, 40170-115, Brazil
| | - Laís A Souza
- Departamento de Química Fundamental, Universidade Federal de Pernambuco, Av. Jorn Aníbal Fernandes, s/n - Cidade Universitária, 50740-560, Recife, Brasil
| | - Isa S Barbosa
- Instituto de Química, Universidade Federal da Bahia, Campus Universitário de Ondina, Ondina, Salvador, Bahia, 40170-115, Brazil
| | - Daniele Cristina M B Santos
- Instituto de Química, Universidade Federal da Bahia, Campus Universitário de Ondina, Ondina, Salvador, Bahia, 40170-115, Brazil
| | - Rennan Geovanny O Araujo
- Instituto de Química, Universidade Federal da Bahia, Campus Universitário de Ondina, Ondina, Salvador, Bahia, 40170-115, Brazil
| | - Maria Graças A Korn
- Instituto de Química, Universidade Federal da Bahia, Campus Universitário de Ondina, Ondina, Salvador, Bahia, 40170-115, Brazil.
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Alizadeh-Bahaabadi G, Lakzadeh L, Forootanfar H, Akhavan HR. Optimization of gluten-free bread production with low aflatoxin level based on quinoa flour containing xanthan gum and laccase enzyme. Int J Biol Macromol 2022; 200:61-76. [PMID: 34973985 DOI: 10.1016/j.ijbiomac.2021.12.091] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 11/20/2021] [Accepted: 12/16/2021] [Indexed: 11/24/2022]
Abstract
This study was aimed to develop a new cereal-based product using quinoa flour, xanthan gum, and laccase and also to evaluate their effects on the quality characteristics of gluten-free bread (GFB). Experimental design method was applied for optimization of gluten-free formulation. The effects of three variables of quinoa flour (0-50%), laccase activity (0-2 U/g flour), and xanthan gum (0-0.5%) on the contents of total aflatoxin (TAF) and aflatoxin B1 (AFB1), color indices (L*, a*, and b*), and texture properties (hardness, cohesiveness, and springiness) of GFB were evaluated. The results showed that quinoa flour and laccase enzyme significantly reduced TAF and AFB1 (p < 0.05). The lowest AFB1 level (3.67 ± 0.96 ng/g) in the GFB formulation containing quinoa flour (40%), laccase enzyme (2.0 U/g), and xanthan gum (0.46%) was very close to the predicted amount (3.66 ± 0.96 ng/g). Quinoa flour significantly reduced the L* and a* values and increased b* value and improved the texture parameters. Laccase enzyme also improved color indices and texture properties. Therefore, the use of laccase enzyme and quinoa flour is recommended based on the desired effect on the quality characteristics of GFB.
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Affiliation(s)
| | - Leila Lakzadeh
- Department of Food Science and Technology, Shahreza Branch, Islamic Azad University, Shahreza, Iran.
| | - Hamid Forootanfar
- Department of Food Science and Technology, Shahreza Branch, Islamic Azad University, Shahreza, Iran; Pharmaceutical Sciences and Cosmetic Products Research Center, Kerman University of Medical Sciences, Kerman, Iran.
| | - Hamid-Reza Akhavan
- Department of Food Science and Technology, Faculty of Agriculture, Shahid Bahonar University of Kerman, Kerman, Iran
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Guo W, Umar A, Algadi H, Albargi H, Ibrahim AA, Cui K, Wang L, Pei M, Wang Y. Design of a unique “ON/OFF” switch electrochemical aptasensor driven by the pH for the detection of Aflatoxin B1 in acid solutions based on titanium carbide/ carboxylated graphene oxide- poly(4-vinyl pyridine)/Aptamer composite. Microchem J 2021. [DOI: 10.1016/j.microc.2021.106548] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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5
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Wang C, Zhang W, Qian J, Wang L, Ren Y, Wang Y, Xu M, Huang X. A FRET aptasensor for sensitive detection of aflatoxin B1 based on a novel donor-acceptor pair between ZnS quantum dots and Ag nanocubes. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2021; 13:462-468. [PMID: 33438701 DOI: 10.1039/d0ay02017f] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Aflatoxin B1 (AFB1) is one of the most carcinogenic chemicals. A novel fluorescence resonance energy transfer (FRET) sensor based on aptamer recognition technology is proposed for the sensitive detection of AFB1 in moldy peanuts using Ag nanocubes as energy acceptors and ZnS quantum dots (QDs) as energy donors. Compared to the traditional FRET system based on an Au quencher, Ag nanocubes can not only quench the fluorescence of aptamer modified ZnS QDs, but are also inexpensive. In addition, compared with heavy metal QDs, ZnS QDs are environmentally friendly, have excellent photochemical properties, and are ideal energy donors. Without Ag nanocubes, the aptamer modified ZnS QDs emits blue fluorescence under an ultraviolet lamp. Because the emission spectrum of ZnS and the absorption spectrum of Ag nanocubes meet the requirements of FRET, the fluorescence quenching of ZnS QDs is realized. Nevertheless, with AFB1, the specific binding of aptamer and complementary chain makes the ZnS QDs break away from the Ag nanocubes, which leads to the fluorescence recovery of the ZnS QDs. Under the optimized detection conditions, the linear range of AFB1 was 5 pg mL-1 to 300 ng mL-1, and there was no obvious reaction with other similar mycotoxins. According to S/N = 3, the detection limit of AFB1 was 2.67 pg mL-1. The detection of AFB1 in peanut samples shows that the new FRET system can successfully be applied in the future to agricultural products.
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Affiliation(s)
- Chengquan Wang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China.
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6
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Spectrophotometric determination of aflatoxin B1 in food sample: Chemometric optimization and theoretical supports for reaction mechanisms and binding regions. J Food Compost Anal 2020. [DOI: 10.1016/j.jfca.2020.103646] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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7
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Determination and chemometric evaluation of the mineral profile of maize flours. J Food Compost Anal 2020. [DOI: 10.1016/j.jfca.2020.103579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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8
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Hui Y, Wang B, Ren R, Zhao A, Zhang F, Song S, He Y. An electrochemical aptasensor based on DNA-AuNPs-HRP nanoprobes and exonuclease-assisted signal amplification for detection of aflatoxin B1. Food Control 2020. [DOI: 10.1016/j.foodcont.2019.106902] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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9
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Jiménez Medina ML, Lafarga T, Garrido Frenich A, Romero-González R. Natural Occurrence, Legislation, and Determination of Aflatoxins Using Chromatographic Methods in Food: A Review (from 2010 to 2019). FOOD REVIEWS INTERNATIONAL 2019. [DOI: 10.1080/87559129.2019.1701009] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- María Luisa Jiménez Medina
- Research Group “Analytical Chemistry of Contaminants”, Department of Chemistry and Physics, Research Centre for Mediterranean Intensive Agrosystems and Agri-Food Biotechnology (CIAIMBITAL), University of Almería, Almería, Spain
| | - Tomas Lafarga
- Processed Fruits & Vegetables, Institute of Agrifood Research and Technology (IRTA), XaRTA-Postharvest, Lleida, Spain
| | - Antonia Garrido Frenich
- Research Group “Analytical Chemistry of Contaminants”, Department of Chemistry and Physics, Research Centre for Mediterranean Intensive Agrosystems and Agri-Food Biotechnology (CIAIMBITAL), University of Almería, Almería, Spain
| | - Roberto Romero-González
- Research Group “Analytical Chemistry of Contaminants”, Department of Chemistry and Physics, Research Centre for Mediterranean Intensive Agrosystems and Agri-Food Biotechnology (CIAIMBITAL), University of Almería, Almería, Spain
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Tezerji NS, Foroughi MM, Bezenjani RR, Jandaghi N, Rezaeipour E, Rezvani F. A facile one-pot green synthesis of β-cyclodextrin decorated porous graphene nanohybrid as a highly efficient adsorbent for extracting aflatoxins from maize and animal feeds. Food Chem 2019; 311:125747. [PMID: 31864190 DOI: 10.1016/j.foodchem.2019.125747] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Revised: 09/26/2019] [Accepted: 10/19/2019] [Indexed: 01/05/2023]
Abstract
In this paper, β-cyclodextrin (β-CD) supported on porous graphene nanohybrid (β-CDPG) was obtained by self-assembly of functionalized graphene nanosheets into a three-dimensional network in the presence of ascorbic acid via an in situ graphene oxide reduction and β-CD functionalization process during a hydrothermal reaction. The prepared supramolecular nanohybrid was further packed into a reusable syringe filter holder and applied as an adsorbent for solid phase extraction of four aflatoxins (B1, B2, G1, G2). Under optimal conditions, the detection limits and linear dynamic ranges were achieved in the range of 0.0075-0.030 μg kg-1 and 0.025-100 μg kg-1, respectively and the relative standard deviations were less than 6.1%. Good recoveries were observed for analyzing target AFs in maize and cereal-based chicken feed samples ranged from 90.5 to 105%. The method offered simultaneous advantages of high supramolecular recognition and enrichment capability of β-CD and the high specific surface area of the porous graphene.
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Affiliation(s)
- Najmeh Sheibani Tezerji
- Department of Chemistry, Faculty of Sciences, Islamic Azad University, Kerman Branch, Kerman, Iran; Iranian National Standards Organization of Hormozgan, Iran
| | - Mohammad Mehdi Foroughi
- Department of Chemistry, Faculty of Sciences, Islamic Azad University, Kerman Branch, Kerman, Iran
| | - Rasoul Rezaei Bezenjani
- Department of Chemistry, Faculty of Sciences, Islamic Azad University, Kerman Branch, Kerman, Iran; National Iranian Copper Industries Company, Iran
| | - Nezhat Jandaghi
- Department of Chemistry, Faculty of Sciences, Islamic Azad University, Kerman Branch, Kerman, Iran
| | - Ebrahim Rezaeipour
- Department of Chemistry, Faculty of Sciences, Shahid Bahonar University, Kerman, Iran; Iranian National Standards Organization of Hormozgan, Iran.
| | - Forogh Rezvani
- Iranian National Standards Organization of Hormozgan, Iran
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11
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Praveen PA, Babu RR. Evaluation of nonlinear optical properties from molecular descriptors of benzimidazole metal complexes by principal component analysis. J Mol Graph Model 2019; 93:107447. [PMID: 31521880 DOI: 10.1016/j.jmgm.2019.107447] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 08/30/2019] [Accepted: 08/30/2019] [Indexed: 11/19/2022]
Abstract
In the present work, semiempirical quantum chemical method (PM6) has been used for the simulation of molecular descriptors of first row transition metal ions incorporated benzimidazole metal complexes. Metal complexes with and without substituents are considered for the analysis. In both the cases, molecules show distinct properties with respect to the molecular descriptors. Since the dimension of the data set is large, principal component analysis has been used and the obtained principal components, PCA1 and PCA2, are linearly regressed with hyperpolarizability values. The obtained results indicate that molecular energy plays a dominant role in the nonlinear optical properties of benzimidazole metal complexes. Further, it is observed that the bond angle, global hardness and heat of formation of the molecules have considerable impact on the hyperpolarizability values.
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Affiliation(s)
- P A Praveen
- Department of Physics, Indian Institute of Science Education and Research, Tirupati, 517 507, Andhra Pradesh, India; Crystal Growth and Thin Film Laboratory, Department of Physics, Bharathidasan University, Tiruchirappalli, 620 024, Tamilnadu, India
| | - R Ramesh Babu
- Crystal Growth and Thin Film Laboratory, Department of Physics, Bharathidasan University, Tiruchirappalli, 620 024, Tamilnadu, India.
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12
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Rasheed U, Wu H, Wei J, Ou X, Qin P, Yao X, Chen H, Chen AJ, Liu B. A polyphasic study of Aspergillus section Flavi isolated from corn in Guangxi, China- a hot spot of aflatoxin contamination. Int J Food Microbiol 2019; 310:108307. [PMID: 31476582 DOI: 10.1016/j.ijfoodmicro.2019.108307] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 08/14/2019] [Accepted: 08/16/2019] [Indexed: 01/22/2023]
Abstract
Aspergillus section Flavi is widely known as a potential threat to contaminate agricultural products and food commodities. In this study, a polyphasic approach consisting of micro- and macro-morphological, chemical and molecular features, was applied to survey the Aspergillus section Flavi population in corn collected from Guangxi, China. Based on multigene phylogenies as well as morphological observations, Aspergillus flavus (192/195), A. arachidicola (1/195), A. pseudonomius (1/195) and A. novoparasiticus (1/195) were found to be the predominant section Flavi population. Among them, 31 representative isolates were selected for mycotoxin determination. The results showed that Aspergillus flavus chemotype I was most common, chemotype IV was also detected with low incidence and low CPA amounts, while chemotypes II and III were absent. Other tested species including A. arachidicola, A. pseudonomius, and A. novoparasiticus produced all types of aflatoxins, but none of them produced CPA. The polyphasic approach applied in this study permitted reliable understanding of the prevailing Aspergillus section Flavi population and their mycotoxin profiles. Knowledge of the prevailing section Flavi population will aid in developing a sustainable strategy to mitigate the effects of aflatoxin contamination. This study suggests that CPA contamination of food should be considered while conducting mycotoxigenic surveys of food commodities, and the same should be considered while planning a bio-control strategy to control aflatoxin contamination.
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Affiliation(s)
- Usman Rasheed
- Institute of Applied Microbiology, College of Agriculture, Guangxi University, Nanning 530005, China
| | - Hao Wu
- Institute of Applied Microbiology, College of Agriculture, Guangxi University, Nanning 530005, China
| | - Jinfan Wei
- Institute of Applied Microbiology, College of Agriculture, Guangxi University, Nanning 530005, China
| | - Xiaoyun Ou
- Institute of Applied Microbiology, College of Agriculture, Guangxi University, Nanning 530005, China
| | - Peisheng Qin
- Institute of Applied Microbiology, College of Agriculture, Guangxi University, Nanning 530005, China
| | - Xiaohua Yao
- Institute of Applied Microbiology, College of Agriculture, Guangxi University, Nanning 530005, China
| | - Han Chen
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100193, China
| | - Amanda Juan Chen
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100193, China.
| | - Bin Liu
- Institute of Applied Microbiology, College of Agriculture, Guangxi University, Nanning 530005, China.
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Nikolić N, Mitrović J, Karabegović I, Savić S, Petrović S, Lazić M, Stojanović G. A comparison between wheat and different kinds of corn flour based on minerals, free phenolic acid composition and antioxidant activity. QUALITY ASSURANCE AND SAFETY OF CROPS & FOODS 2019. [DOI: 10.3920/qas2018.1411] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- N. Nikolić
- University of Niš, Faculty of Technology, Department for Food Technologies and Biotechnology, Bulevar oslobodjenja 124, 16000 Leskovac, Serbia
| | - J. Mitrović
- University of Niš, Faculty of Technology, Department for Food Technologies and Biotechnology, Bulevar oslobodjenja 124, 16000 Leskovac, Serbia
| | - I. Karabegović
- University of Niš, Faculty of Technology, Department for Food Technologies and Biotechnology, Bulevar oslobodjenja 124, 16000 Leskovac, Serbia
| | - S. Savić
- University of Niš, Faculty of Technology, Department for Food Technologies and Biotechnology, Bulevar oslobodjenja 124, 16000 Leskovac, Serbia
| | - S. Petrović
- University of Niš, Faculty of Technology, Department for Food Technologies and Biotechnology, Bulevar oslobodjenja 124, 16000 Leskovac, Serbia
| | - M. Lazić
- University of Niš, Faculty of Technology, Department for Food Technologies and Biotechnology, Bulevar oslobodjenja 124, 16000 Leskovac, Serbia
| | - G. Stojanović
- University of Niš, Faculty of Science and Mathematics, Department of Chemistry, Višegradska 33, 18000 Niš, Serbia
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Wang C, Zhang H, Jiang X, Zhou B. Electrochemical Determination of Aflatoxin B1 (AFB1) Using a Copper-Based Metal-Organic Framework (Cu-MOF) and Gold Nanoparticles (AuNPs) with Exonuclease III (Exo III) Assisted Recycling by Differential Pulse Voltammetry (DPV). ANAL LETT 2019. [DOI: 10.1080/00032719.2019.1610418] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Chunyan Wang
- Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Jiangsu Key Laboratory of Biomedical Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, China
| | - Hui Zhang
- Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Jiangsu Key Laboratory of Biomedical Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, China
| | - Xiaoqing Jiang
- Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Jiangsu Key Laboratory of Biomedical Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, China
| | - Bo Zhou
- Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Jiangsu Key Laboratory of Biomedical Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, China
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16
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Pekel A, Çalık A, Alataş M, Kuter E, Cengiz Ö, Omurtag G, İnan G. Evaluation of Correlations Between Nutrients, Fatty Acids, Heavy Metals, and Deoxynivalenol in Corn (Zea mays L.). J APPL POULTRY RES 2019. [DOI: 10.3382/japr/pfy023] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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17
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Evaluation of macro and micronutrient elements content from soft drinks using principal component analysis and Kohonen self-organizing maps. Food Chem 2019; 273:9-14. [DOI: 10.1016/j.foodchem.2018.06.021] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Revised: 05/29/2018] [Accepted: 06/04/2018] [Indexed: 11/17/2022]
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18
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Xia X, Wang H, Yang H, Deng S, Deng R, Dong Y, He Q. Dual-Terminal Stemmed Aptamer Beacon for Label-Free Detection of Aflatoxin B 1 in Broad Bean Paste and Peanut Oil via Aggregation-Induced Emission. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:12431-12438. [PMID: 30387615 DOI: 10.1021/acs.jafc.8b05217] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Aflatoxin B1 (AFB1) contamination ranks as one of the most critical food safety issues, and assays for its on-site monitoring are highly demanded. Herein, we propose a label-free, one-tube, homogeneous, and cheap AFB1 assay based on a finely tunable dual-terminal stemmed aptamer beacon (DS aptamer beacon) and aggregation-induced emission (AIE) effects. The DS aptamer beacon structure could provide terminal protection of the aptamer probe against exonuclease I and confer specific and quick response to target AFB1. In comparison to the conventional molecule beacon structure, the stability of the DS aptamer beacon could be finely tuned by adjusting its two terminal stems, allowing for elaborately optimizing probe affinity and selectivity. By the utilization of an AIE-active fluorophore, which would be lighted up by aggregating to negatively charged DNA, AFB1 could be determined in a label-free manner. The proposed method could quantify AFB1 in one test tube using two unlabeled DNA strands. It has been successfully applied for analyzing AFB1 in peanut oil and broad bean sauce, with total recoveries ranging from 92.75 to 118.70%. Thus, the DS aptamer beacon-based assay could potentially facilitate real-time monitoring and controlling of AFB1 pollution.
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Affiliation(s)
- Xuhan Xia
- College of Light Industry, Textile and Food Engineering, Healthy Food Evaluation Research Center, and Key Laboratory of Food Science and Technology of Ministry of Education of Sichuan Province , Sichuan University , Chengdu , Sichuan 610065 , People's Republic of China
| | - Haibo Wang
- College of Light Industry, Textile and Food Engineering, Healthy Food Evaluation Research Center, and Key Laboratory of Food Science and Technology of Ministry of Education of Sichuan Province , Sichuan University , Chengdu , Sichuan 610065 , People's Republic of China
| | - Hao Yang
- College of Light Industry, Textile and Food Engineering, Healthy Food Evaluation Research Center, and Key Laboratory of Food Science and Technology of Ministry of Education of Sichuan Province , Sichuan University , Chengdu , Sichuan 610065 , People's Republic of China
| | - Sha Deng
- College of Light Industry, Textile and Food Engineering, Healthy Food Evaluation Research Center, and Key Laboratory of Food Science and Technology of Ministry of Education of Sichuan Province , Sichuan University , Chengdu , Sichuan 610065 , People's Republic of China
| | - Ruijie Deng
- College of Light Industry, Textile and Food Engineering, Healthy Food Evaluation Research Center, and Key Laboratory of Food Science and Technology of Ministry of Education of Sichuan Province , Sichuan University , Chengdu , Sichuan 610065 , People's Republic of China
| | - Yi Dong
- College of Light Industry, Textile and Food Engineering, Healthy Food Evaluation Research Center, and Key Laboratory of Food Science and Technology of Ministry of Education of Sichuan Province , Sichuan University , Chengdu , Sichuan 610065 , People's Republic of China
| | - Qiang He
- College of Light Industry, Textile and Food Engineering, Healthy Food Evaluation Research Center, and Key Laboratory of Food Science and Technology of Ministry of Education of Sichuan Province , Sichuan University , Chengdu , Sichuan 610065 , People's Republic of China
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19
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Optimization of Matrix Solid-Phase Dispersion Method for Extraction of Aflatoxins from Cornmeal. FOOD ANAL METHOD 2018. [DOI: 10.1007/s12161-018-1311-1] [Citation(s) in RCA: 4] [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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Torović L. Aflatoxins and ochratoxin A in flour: a survey of the Serbian retail market. FOOD ADDITIVES & CONTAMINANTS PART B-SURVEILLANCE 2017; 11:26-32. [PMID: 29046120 DOI: 10.1080/19393210.2017.1391335] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
This report presents data on the occurrence of aflatoxins (AF) and ochratoxin A in different types of flour marketed in Serbia. A total of 114 samples of wheat, buckwheat, rye, oat, barley, rice, millet and corn flour were collected in the period 2012-2016 and analysed using high performance liquid chromatography with fluorescence detection. Among flours other than corn, AFB1 was quantified only in rice, while ochratoxin A (OTA) was found in 29% of the samples. In corn flours the percentage of positive samples varied greatly over the years: AFB1 7.1-80.0%, OTA 30.0-40.6%, with a co-occurrence of 7.1-34.4%. Overall 5.2% of flours other than corn and 10.7% of corn flours exceeded the maximum levels (MLs) for AFB1 and/or OTA. The highest recorded levels were 8.80 μg kg-1 of AFB1 (corn) and 23.04 μg kg-1 of OTA (rye). Overall mean contamination levels of corn flours were 0.53 μg kg-1 of AFB1 and 0.46 μg kg-1 of OTA.
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Affiliation(s)
- Ljilja Torović
- a University of Novi Sad, Faculty of Medicine , Department of Pharmacy , Novi Sad , Serbia.,b Institute of Public Health of Vojvodina, Center for Hygiene and Human Ecology , Novi Sad , Serbia
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Correia FO, Silva DS, Costa SSL, Silva IKV, da Silva DR, Alves JDPH, Garcia CA, Maranhão TDA, Passos EA, Araujo RG. Optimization of microwave digestion and inductively coupled plasma-based methods to characterize cassava, corn and wheat flours using chemometrics. Microchem J 2017. [DOI: 10.1016/j.microc.2017.09.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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22
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Kelte Filho I, Butik M, Jaski AC, Quináia SP. Fast method to determine the elements in maize flour: reduction in preparation time and reagent consumption. BRAZILIAN JOURNAL OF FOOD TECHNOLOGY 2017. [DOI: 10.1590/1981-6723.9117] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Abstract The aim of this work was to develop and validate methodology to reduce the digestion time and reagent consumption in the determination of minerals in maize flour. The standard methodology employed in Brazil is that described by AOAC. It consists of the calcination of the sample at high temperatures for a long period of time, making the process expensive and slow. In this work, a wet sample digestion method using HNO3 was employed, heating on a block digester with final dissolution in an ultrasonic bath. The validation tests involved linearity and working range studies, and the determination of the detection and quantification limits, accuracy and precision. The sample digestion time was 1:30 h and the percent recoveries for the metals were 93% for Ca, 98% for Cu, 110% for Fe, 97% for Mg, 101% for Mn and 106% for Zn.
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Li Q, Lu Z, Tan X, Xiao X, Wang P, Wu L, Shao K, Yin W, Han H. Ultrasensitive detection of aflatoxin B 1 by SERS aptasensor based on exonuclease-assisted recycling amplification. Biosens Bioelectron 2017; 97:59-64. [PMID: 28554047 DOI: 10.1016/j.bios.2017.05.031] [Citation(s) in RCA: 87] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Revised: 05/09/2017] [Accepted: 05/17/2017] [Indexed: 01/08/2023]
Abstract
Aflatoxin B1 (AFB1) is one of the most abundant and carcinogenic food-contaminating mycotoxins around the world. In this study, we proposed a surface enhanced Raman scattering (SERS) sensing strategy for the determination of AFB1. An aptamer for AFB1 partially hybridized with complementary-DNA, which was released after the recognition of AFB1 and immediately hybridized with hairpin DNA on the surface of sputtering Au film. Exonuclease III hydrolyzed the double-stranded DNA, leaving short single-stranded DNA on the Au surface and releasing complementary-DNA for next ring opening and digestion. SERS tag was captured on Au surface by DNA hybridization. Agarose gel electrophoresis and dynamic light scattering showed that SERS tag was successfully prepared. The detection principle was validated by electrochemical impedance spectroscopy and SERS at each step. High sensitivity and good selectivity for AFB1 detection were observed. The results showed that there was a good linear relation when the AFB1 concentration was from 1×10-6 to 1ng/mL, and the limit of detection (LOD) was 0.4 fg/mL. This sensor was also applied for quantifying AFB1 levels in spiked peanuts samples, the recoveries was in the range of 89-121%.
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Affiliation(s)
- Qin Li
- State Key Laboratory of Agricultural Microbiology, College of Science, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Zhicheng Lu
- State Key Laboratory of Agricultural Microbiology, College of Science, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Xuecai Tan
- State Key Laboratory of Agricultural Microbiology, College of Science, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Xiaoyan Xiao
- State Key Laboratory of Agricultural Microbiology, College of Science, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Pan Wang
- State Key Laboratory of Agricultural Microbiology, College of Science, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Long Wu
- State Key Laboratory of Agricultural Microbiology, College of Science, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Kang Shao
- State Key Laboratory of Agricultural Microbiology, College of Science, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Wenmin Yin
- State Key Laboratory of Agricultural Microbiology, College of Science, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Heyou Han
- State Key Laboratory of Agricultural Microbiology, College of Science, Huazhong Agricultural University, Wuhan 430070, PR China.
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Brito ALB, Oliveira AF, Nogueira ARA, Pessoa AG, Pontes LF. Determination of inorganic constituents and physicochemical characterization of functional flour samples. Microchem J 2017. [DOI: 10.1016/j.microc.2017.01.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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25
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Disposable amperometric immunosensor for simple and sensitive determination of aflatoxin B 1 in wheat. Biochem Eng J 2016. [DOI: 10.1016/j.bej.2016.08.003] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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Quantitative Scrutinization of Aflatoxins in Different Spices from Pakistan. Int J Anal Chem 2016; 2016:4907425. [PMID: 27781067 PMCID: PMC5066014 DOI: 10.1155/2016/4907425] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Revised: 08/26/2016] [Accepted: 08/28/2016] [Indexed: 11/17/2022] Open
Abstract
The current research work aimed to access the contamination level of aflatoxins B1, B2, G1, and G2 in the household spices that are widely consumed in huge amounts. 200 different spice samples, 100 packed and 100 unpacked, were analyzed for the aflatoxins profile by HPLC with an incidence of 61.5% contamination out of which 53.66% samples exceed the EU limit. The results disclosed that the unpacked samples are more contaminated as compared to the packed samples except for white cumin seeds. Among packed and unpacked samples of spices, the maximum value of aflatoxins was detected in fennel, that is, 27.93 μg/kg and 67.04 μg/kg, respectively. The lowest concentration of aflatoxin was detected in cinnamon in packed form (0.79 μg/kg) and in the unpacked samples of white cumin seeds which is 1.75 μg/kg. Caraway seeds and coriander in its unpacked form showed positive results whereas black pepper (packed and unpacked) was found free from aflatoxins. This is the first report on the occurrence of aflatoxins in packed and unpacked samples of spices from Pakistan. To ensure safe consumption of spices, there should be constant monitoring of aflatoxin and more studies need to be executed with the intention of preventing mycotoxin accretion in this commodity.
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Beyene A, Woldegiorgis A, Adish A, De Saeger S, Tolossa A. Assessment of mothers’ knowledge and practice towards aflatoxin contamination in complementary foods in Ethiopia: from pre-harvest to household. WORLD MYCOTOXIN J 2016. [DOI: 10.3920/wmj2016.2088] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
This study assessed the knowledge and practices of the mothers in Ethiopia on issues related to aflatoxin in complementary foods (CFs) using structured questionnaires. The study involved 195 mothers from Amhara, Tigray, Oromia, and Southern Nations Nationalities and Peoples (SNNP) regions and addressed a range of issues used to prevent the risks of mould and aflatoxin contamination from farm-to-table. Of the 195 mothers who responded; 186 (95%) were ploughing their land before growing the next crop, 177 (91%) used the crop rotation schedule, 157 (81%) reported the practice of removing old seed heads and stalks used as an inoculum for aflatoxin contamination, 185 (95%) harvested the crops as soon as the crops were matured, 138 (70%) used a threshing method known as ‘trampling by hoofed animals’. After threshing, about 124 (64%) respondents had the knowledge and practice of drying cereals and legumes to decrease the moisture content, 134 (68%) used solar drying on a bare ground, 184 (94%) cleaned and disinfected the storage structures before storage. Almost all the respondents practiced the CFs processing steps properly and they used colour, type, odour, insect infestations, mouldiness and all these criteria to select the CFs ingredients. A total of 78 (40%) respondents had the practice of feeding mouldy cereals and legumes to animals, and 89 (46%) of the respondents erroneously believed that roasting can decontaminate the aflatoxin produced from mouldy cereals. As a general conclusion, the majority of the respondents are practicing good agricultural practices in the field, but they use poor storage and processing practices at homes which are susceptible to mould and aflatoxin contamination. Besides, they lack awareness about the toxic effects of aflatoxin on human health. Therefore, awareness creation about the health impacts of aflatoxin and methods of prevention need to be implemented in the study areas.
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Affiliation(s)
- A.A. Beyene
- Department of Post-Harvest Management, College of Agriculture and Veterinary Medicine, Jimma University, Jimma, Ethiopia
- Center for Food Science and Nutrition, College of Natural Sciences, Addis Ababa University, 1176 Addis Ababa, Ethiopia
| | - A.Z. Woldegiorgis
- Center for Food Science and Nutrition, College of Natural Sciences, Addis Ababa University, 1176 Addis Ababa, Ethiopia
| | - A.A. Adish
- Micronutrient Initiative (MI), Addis Ababa, Ethiopia
| | - S. De Saeger
- Department of Bioanalysis, Laboratory of Food Analysis, Faculty of Pharmaceutical Sciences, Ghent University, Ottergemsesteenweg 460, 9000 Ghent, Belgium
| | - A.L. Tolossa
- Micronutrient Initiative (MI), Addis Ababa, Ethiopia
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Brizio P, Benedetto A, Squadrone S, Curcio A, Pellegrino M, Ferrero M, Abete MC. Heavy metals and essential elements in Italian cereals. FOOD ADDITIVES & CONTAMINANTS PART B-SURVEILLANCE 2016; 9:261-267. [DOI: 10.1080/19393210.2016.1209572] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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29
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Şengül Ü, Yalçın E, Şengül B, Çavuşoğlu K. Investigation of aflatoxin contamination in maize flour consumed in Giresun, Turkey. QUALITY ASSURANCE AND SAFETY OF CROPS & FOODS 2016. [DOI: 10.3920/qas2015.0672] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Ü. Şengül
- Central Research Laboratory, Güre Location, Giresun University, 28100 Giresun, Turkey
| | - E. Yalçın
- Department of Biology, Faculty of Science and Art, Güre Location, Giresun University, 28100 Giresun, Turkey
| | - B. Şengül
- Vocational High School of Giresun, Debboy Location, Giresun University, 28049 Giresun, Turkey
| | - K. Çavuşoğlu
- Department of Biology, Faculty of Science and Art, Güre Location, Giresun University, 28100 Giresun, Turkey
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30
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Luzardo OP, Bernal-Suárez MDM, Camacho M, Henríquez-Hernández LA, Boada LD, Rial-Berriel C, Almeida-González M, Zumbado M, Díaz-Díaz R. Estimated exposure to EU regulated mycotoxins and risk characterization of aflatoxin-induced hepatic toxicity through the consumption of the toasted cereal flour called "gofio", a traditional food of the Canary Islands (Spain). Food Chem Toxicol 2016; 93:73-81. [PMID: 27132021 DOI: 10.1016/j.fct.2016.04.022] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2016] [Revised: 04/22/2016] [Accepted: 04/26/2016] [Indexed: 12/01/2022]
Abstract
"Gofio" is a type of flour made from toasted grain, which is part of the staple food in the Canary Islands, Spain, in which the occurrence of Aflatoxins B1, B2, G1 and G2 (AFB1, AFB2, AFG1, AFG2), Fumonisins B1 and B2 (FB1 and FB2) Ochratoxin A (OTA), Deoxynivalenol (DNV) and Zearalenone (ZEA) was evaluated. 83% of the samples were contaminated with at least one mycotoxin and 69.2% of the analyzed samples showed co-occurrence of mycotoxins (range 2 to 8). All the concentrations were well below the established limits (maximum values of AFs=0.42 μg/kg; FBs=178.3 μg/kg; OTA=0.3 μg/kg; DON=92.5 μg/kg; and ZEA=9.9 μg/kg). The daily dietary exposure to total AFs was estimated to be 7.1% of the TDI. This value was almost double in children, and considering the upper-bound approach could reach 35% of the TDI. For the rest of mycotoxins, the consumers would be exposed to less than 2% of their TDIs. The risk characterization indicates that there is a potential risk in developing aflatoxin induced liver cancer due to gofio consumption in the subpopulation which is simultaneously exposed to other hepatocarcinogens, such as the hepatitis B virus.
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Affiliation(s)
- Octavio P Luzardo
- Toxicology Unit, Research Institute of Biomedical and Health Sciences (IUIBS), University of Las Palmas de Gran Canaria, Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria, Spain; Instituto Canario de Investigación del Cáncer (ICIC), Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria, Spain; Spanish Biomedical Research Centre in Physiopathology of Obesity and Nutrition (CIBERObn), Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria, Spain.
| | - María Del Mar Bernal-Suárez
- Department of Environmental Analysis, Technological Institute of the Canary Islands, C/ Los Cactus no 68 35118, Polígono Industrial de Arinaga, Agüimes, Las Palmas, Canary Islands, Spain
| | - María Camacho
- Toxicology Unit, Research Institute of Biomedical and Health Sciences (IUIBS), University of Las Palmas de Gran Canaria, Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria, Spain; Instituto Canario de Investigación del Cáncer (ICIC), Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria, Spain; Spanish Biomedical Research Centre in Physiopathology of Obesity and Nutrition (CIBERObn), Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria, Spain
| | - Luis Alberto Henríquez-Hernández
- Toxicology Unit, Research Institute of Biomedical and Health Sciences (IUIBS), University of Las Palmas de Gran Canaria, Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria, Spain; Instituto Canario de Investigación del Cáncer (ICIC), Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria, Spain; Spanish Biomedical Research Centre in Physiopathology of Obesity and Nutrition (CIBERObn), Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria, Spain
| | - Luis D Boada
- Toxicology Unit, Research Institute of Biomedical and Health Sciences (IUIBS), University of Las Palmas de Gran Canaria, Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria, Spain; Instituto Canario de Investigación del Cáncer (ICIC), Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria, Spain; Spanish Biomedical Research Centre in Physiopathology of Obesity and Nutrition (CIBERObn), Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria, Spain
| | - Cristian Rial-Berriel
- Toxicology Unit, Research Institute of Biomedical and Health Sciences (IUIBS), University of Las Palmas de Gran Canaria, Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria, Spain; Instituto Canario de Investigación del Cáncer (ICIC), Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria, Spain; Spanish Biomedical Research Centre in Physiopathology of Obesity and Nutrition (CIBERObn), Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria, Spain
| | - Maira Almeida-González
- Toxicology Unit, Research Institute of Biomedical and Health Sciences (IUIBS), University of Las Palmas de Gran Canaria, Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria, Spain; Instituto Canario de Investigación del Cáncer (ICIC), Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria, Spain; Spanish Biomedical Research Centre in Physiopathology of Obesity and Nutrition (CIBERObn), Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria, Spain
| | - Manuel Zumbado
- Toxicology Unit, Research Institute of Biomedical and Health Sciences (IUIBS), University of Las Palmas de Gran Canaria, Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria, Spain; Instituto Canario de Investigación del Cáncer (ICIC), Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria, Spain; Spanish Biomedical Research Centre in Physiopathology of Obesity and Nutrition (CIBERObn), Plaza Dr. Pasteur s/n, 35016 Las Palmas de Gran Canaria, Spain
| | - Ricardo Díaz-Díaz
- Department of Environmental Analysis, Technological Institute of the Canary Islands, C/ Los Cactus no 68 35118, Polígono Industrial de Arinaga, Agüimes, Las Palmas, Canary Islands, Spain.
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Wang L, Cao P, Li W, Tong P, Zhang X, Du Y. Simultaneous detection of trace metal ions in water by solid phase extraction spectroscopy combined with multivariate calibration. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2016; 159:151-156. [PMID: 26845581 DOI: 10.1016/j.saa.2016.01.036] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Revised: 01/15/2016] [Accepted: 01/23/2016] [Indexed: 06/05/2023]
Abstract
Solid Phase Extraction Spectroscopy (SPES) developed in this paper is a technique to measure spectrum directly on the solid phase material where the analytes are concentrated in SPE process. Membrane enrichment and UV-Visible spectroscopy were utilized to fulfill SPES, and multivariate calibration method of partial least squares (PLS) was used to simultaneously detect the concentrations of trace cobalt (II) and zinc (II) in water samples. The proposed method is simple, sensitive and selective. The complexes of analyte ions were collected on the cellulose acetate membranes via membrane filtration after the complexation reaction with 1-2-pyridylazo 2-naphthol (PAN). The spectra of the membranes which contained the complexes of metal ions and PAN were measured directly without eluting. The analytical conditions including pH, reaction time, sample volume, the amount of PAN, and flow rates were optimized. Nonionic surfactant Brij-30 was absorbed on the membranes prior to SPES to modify the membranes for improving the enrichment and spectrum measurement. The interference from other ions to the determination was investigated. Under the optimal condition, the absorbance was linearly related to the concentration at the range of 0.1-3.0 μg/L and 0.1-2.0 μg/L, with the correlation coefficients (R(2)) of 0.9977 and 0.9951 for Co (II) and Zn (II), respectively. The limits of detection were 0.066 μg/L for cobalt (II) and 0.104 μg/L for zinc (II). PLS regression with leave-one-out cross-validation was utilized to build models to detect cobalt (II) and zinc (II) in drinking water samples simultaneously. The correlation coefficient between ion concentration and spectrum of calibration set and independent prediction set were 1.0000 and 0.9974 for cobalt (II) and 1.0000 and 0.9956 for zinc (II). For cobalt (II) and zinc (II), the errors of the prediction set were in the range 0.0406-0.1353 μg/L and 0.0025-0.1884 μg/L.
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Affiliation(s)
- Lei Wang
- Shanghai Key Laboratory of Functional Materials Chemistry, and Research Center of Analysis and Test, East China University of Science and Technology, Meilong Rd 130, Shanghai 200237, China
| | - Peng Cao
- Yantai Entry-Exit Inspection and Quarantine Bureau, Beima Rd 66, Yantai 264000, China
| | - Wei Li
- Shanghai Key Laboratory of Functional Materials Chemistry, and Research Center of Analysis and Test, East China University of Science and Technology, Meilong Rd 130, Shanghai 200237, China
| | - Peijin Tong
- Shanghai Key Laboratory of Functional Materials Chemistry, and Research Center of Analysis and Test, East China University of Science and Technology, Meilong Rd 130, Shanghai 200237, China
| | - Xiaofang Zhang
- Shanghai Key Laboratory of Functional Materials Chemistry, and Research Center of Analysis and Test, East China University of Science and Technology, Meilong Rd 130, Shanghai 200237, China
| | - Yiping Du
- Shanghai Key Laboratory of Functional Materials Chemistry, and Research Center of Analysis and Test, East China University of Science and Technology, Meilong Rd 130, Shanghai 200237, China.
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Label-free immunosensor based on one-step electrodeposition of chitosan-gold nanoparticles biocompatible film on Au microelectrode for determination of aflatoxin B1 in maize. Biosens Bioelectron 2016; 80:222-229. [PMID: 26851579 DOI: 10.1016/j.bios.2016.01.063] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Revised: 01/26/2016] [Accepted: 01/27/2016] [Indexed: 11/24/2022]
Abstract
Gold nanoparticles (AuNPs) embedded in chitosan (CHI) film, well-dispersed and smaller in size (about 10 nm), were fabricated by one-step electrodeposion on Au microelectrode in solution containing chitosan and chloride trihydrate. The nano-structure CHI-AuNPs composite film offers abundant amine groups, good conductivity, excellent biocompatibility and stability for antibody immobilization. The combination of aflatoxin B1 (AFB1) with immobilized antibody introduces a barrier to electron transfer, resulting in current decreasement. The morphologies and characterizations of modified microelectrodes were investigated by scanning electron microscope (SEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and Fourier transform infrared spectroscopy (FT-IR). The proposed non-enzyme and label-free immunosensor exhibited high sensitive amperometric response to AFB1 concentration in two linear ranges of 0.1 to 1 ng mL(-1) and 1 to 30 ng mL(-1), with the detection limit of 0.06 ng mL(-1) (S/N=3). The immunoassay was also applied for analysis of maize samples spiked with AFB1. Considering the sample extraction procedure, the linear range and limit of detection were assessed to be 1.6-16 ng mL(-1) and 0.19 ng mL(-1) respectively. The simple method showed good fabrication controllability and reproducibility for immunosensor design.
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33
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Analytical techniques combined with chemometrics for authentication and determination of contaminants in condiments: A review. J Food Compost Anal 2015. [DOI: 10.1016/j.jfca.2015.05.004] [Citation(s) in RCA: 89] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Aydın M, Aydın S, Bacanlı M, Başaran N. Aflatoxin levels in chronic hepatitis B patients with cirrhosis or hepatocellular carcinoma in Balıkesir, Turkey. J Viral Hepat 2015; 22:926-35. [PMID: 25894298 DOI: 10.1111/jvh.12410] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2014] [Accepted: 02/23/2015] [Indexed: 01/03/2023]
Abstract
Aflatoxins, the secondary metabolites produced by species of naturally occurring Aspergilli, are commonly found in food such as cereals, dried fruits and juice, wine, beer and spices. They are hepatotoxic and are well known human carcinogens based on evidence from human studies. Aflatoxins are an environmental risk factor for the development of hepatocellular carcinoma (HCC). Chronic hepatitis B-infected patients are at increased risk of cirrhosis, hepatic failure and liver cancer. This study was designed to determine the serum aflatoxin B1 (AFB1 ), aflatoxin B2 (AFB2 ), aflatoxin G1 (AFG1 ) and aflatoxin G2 (AFG2 ) concentrations using high-pressure liquid chromatography (HPLC) in hepatitis B-infected patients with or without cirrhosis and liver cancer, alongside healthy controls in Balıkesir, Turkey. The mean AFB1 and total AF levels in patients without liver cancer and cirrhosis were significantly higher than healthy controls. The mean AFB1 and total AF levels in patients with chronic hepatitis B and HCC were significantly higher than infected patients with or without cirrhosis. These results suggest that patients with chronic hepatitis B who are exposed to AFs are at increased risk for developing HCC, which might be prevented by reducing consumption of contaminated foods.
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Affiliation(s)
- M Aydın
- Department of Infectious Diseases and Clinical Microbiology, Faculty of Medicine, Istanbul Hospital of Başkent University, Istanbul, Turkey
| | - S Aydın
- Department of Pharmaceutical Toxicology, Faculty of Pharmacy, Hacettepe University, Ankara, Turkey
| | - M Bacanlı
- Department of Pharmaceutical Toxicology, Faculty of Pharmacy, Hacettepe University, Ankara, Turkey
| | - N Başaran
- Department of Pharmaceutical Toxicology, Faculty of Pharmacy, Hacettepe University, Ankara, Turkey
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Zeinvand-Lorestani H, Sabzevari O, Setayesh N, Amini M, Nili-Ahmadabadi A, Faramarzi MA. Comparative study of in vitro prooxidative properties and genotoxicity induced by aflatoxin B1 and its laccase-mediated detoxification products. CHEMOSPHERE 2015; 135:1-6. [PMID: 25876029 DOI: 10.1016/j.chemosphere.2015.03.036] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2014] [Revised: 03/01/2015] [Accepted: 03/14/2015] [Indexed: 05/16/2023]
Abstract
In this paper, the enzymatic detoxification of aflatoxin B1 (AFB1) by laccase was studied, and the prooxidant properties and mutagenicity of the detoxification products were compared with those of AFB1. The optimal enzymatic reaction occurred in 0.1M of citrate buffer containing 20% DMSO at 35 °C, a pH of 4.5, and a laccase activity of 30 U mL(-1). After 2 d, sixty-seven percent of the toxic substrate was removed. The prooxidative properties of the detoxified products (27% versus 86%) and the mutagenicity were significantly decreased in comparison with the parent toxin. Unlike AFB1, which promoted metabolism-dependent genetic mutations by base-pair substitution, the detoxified products did not induce genotoxicity. Comparison of the Km values for AFB1 and riboflavin, a valuable food nutrient, indicated that laccase showed greater affinity for the toxin than for riboflavin.
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Affiliation(s)
- Hamed Zeinvand-Lorestani
- Department of Pharmacology and Toxicology, Faculty of Pharmacy and Toxicology and Poisoning Research Centre, Tehran University of Medical Sciences, Tehran 1417614411, Iran
| | - Omid Sabzevari
- Department of Pharmacology and Toxicology, Faculty of Pharmacy and Toxicology and Poisoning Research Centre, Tehran University of Medical Sciences, Tehran 1417614411, Iran.
| | - Neda Setayesh
- Department of Pharmaceutical Biotechnology, Faculty of Pharmacy and Biotechnology Research Center, Tehran University of Medical Sciences, Tehran 1417614411, Iran
| | - Mohsen Amini
- Department of Medicinal Chemistry, Faculty of Pharmacy and Drug Design and Development Research Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Amir Nili-Ahmadabadi
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Mohammad Ali Faramarzi
- Department of Pharmaceutical Biotechnology, Faculty of Pharmacy and Biotechnology Research Center, Tehran University of Medical Sciences, Tehran 1417614411, Iran.
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Clarke R, Connolly L, Frizzell C, Elliott CT. Challenging conventional risk assessment with respect to human exposure to multiple food contaminants in food: A case study using maize. Toxicol Lett 2015. [PMID: 26196220 DOI: 10.1016/j.toxlet.2015.07.006] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Mycotoxins and heavy metals are ubiquitous in the environment and contaminate many foods. The widespread use of pesticides in crop production to control disease contributes further to the chemical contamination of foods. Thus multiple chemical contaminants threaten the safety of many food commodities; hence the present study used maize as a model crop to identify the severity in terms of human exposure when multiple contaminants are present. High Content Analysis (HCA) measuring multiple endpoints was used to determine cytotoxicity of complex mixtures of mycotoxins, heavy metals and pesticides. Endpoints included nuclear intensity (NI), nuclear area (NA), plasma membrane permeability (PMP), mitochondrial membrane potential (MMP) and mitochondrial mass (MM). At concentrations representing legal limits of each individual contaminant in maize (3ng/ml ochratoxin A (OTA), 1μg/ml fumonisin B1 (FB1), 2ng/ml aflatoxin B1 (AFB1), 100ng/ml cadmium (Cd), 150ng/ml arsenic (As), 50ng/ml chlorpyrifos (CP) and 5μg/ml pirimiphos methyl (PM), the mixtures (tertiary mycotoxins plus Cd/As) and (tertiary mycotoxins plus Cd/As/CP/PM) were cytotoxic for NA and MM endpoints with a difference of up to 13.6% (p≤0.0001) and 12% (p≤0.0001) respectively from control values. The most cytotoxic mixture was (tertiary mycotoxins plus Cd/As/CP/PM) across all 4 endpoints (NA, NI, MM and MMP) with increases up to 61.3%, 23.0%, 61.4% and 36.3% (p≤0.0001) respectively. Synergy was evident for two endpoints (NI and MM) at concentrations contaminating maize above legal limits, with differences between expected and measured values of (6.2-12.4% (p≤0.05-p≤0.001) and 4.5-12.3% (p≤0.05-p≤0.001) for NI and MM, respectively. The study introduces for the first time, a holistic approach to identify the impact in terms of toxicity to humans when multiple chemical contaminants are present in foodstuffs. Governmental regulatory bodies must begin to contemplate how to safeguard the population when such mixtures of contaminants are found in foods and this study starts to address this critical issue.
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Affiliation(s)
- R Clarke
- Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, Ireland.
| | - L Connolly
- Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, Ireland
| | - C Frizzell
- Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, Ireland
| | - C T Elliott
- Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, Ireland
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Manafi MH, Allahyari M, Pourghazi K, Amoli-Diva M, Taherimaslak Z. Surfactant-enhanced spectrofluorimetric determination of total aflatoxins from wheat samples after magnetic solid-phase extraction using modified Fe₃O₄ nanoparticles. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 146:43-49. [PMID: 25804513 DOI: 10.1016/j.saa.2015.03.050] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2014] [Revised: 02/05/2015] [Accepted: 03/02/2015] [Indexed: 06/04/2023]
Abstract
The extraction and preconcentration of total aflatoxins (including aflatoxin B1, B2, G1, and G2) using magnetic nanoparticles based solid phase extraction (MSPE) followed by surfactant-enhanced spectrofluorimetric detection was proposed. Ethylene glycol bis-mercaptoacetate modified silica coated Fe3O4 nanoparticles as an efficient antibody-free adsorbent was successfully applied to extract aflatoxins from wheat samples. High surface area and strong magnetization properties of magnetic nanoparticles were utilized to achieve high enrichment factor (97), and satisfactory recoveries (92-105%) using only 100mg of the adsorbent. Furthermore, the fast separation time (less than 10 min) avoids many time-consuming cartridge loading or column-passing procedures accompany with the conventional SPE. In determination step, signal enhancement was performed by formation of Triton X-100 micelles around the analytes in 15% (v/v) acetonitrile-water which dramatically increase the sensitivity of the method. Main factors affecting the extraction efficiency and signal enhancement of the analytes including pH of sample solution, desorption conditions, extraction time, sample volume, adsorbent amount, surfactant concentration and volume and time of micelle formation were evaluated and optimized. Under the optimum conditions, wide linear range of 0.1-50 ng mL(-1) with low detection limit of 0.03 ng mL(-1) were obtained. The developed method was successfully applied to the extraction and preconcentration of aflatoxins in three commercially available wheat samples and the results were compared with the official AOAC method.
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Affiliation(s)
| | - Mehdi Allahyari
- Quality Control Laboratory, ARA Quality Research Co., Tehran, Iran
| | - Kamyar Pourghazi
- Faculty of Chemistry, Kharazmi (Tarbiat Moallem) University, Tehran, Iran
| | - Mitra Amoli-Diva
- Department of Chemistry, Payame Noor University (PNU), P.O. Box 19395-3697, Tehran, Iran.
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Pandey GP, Singh AK, Prasad S, Deshmukh L, Asthana A. Development of surfactant assisted kinetic method for trace determination of thallium in environmental samples. Microchem J 2015. [DOI: 10.1016/j.microc.2014.08.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Liu C, He S, Shen K, Feng X, Fang G, Wang S. l-Cysteine Functionalized Silica Gel as an Efficient Adsorbent for the Determination of Heavy Metals in Foods by ICP-MS. FOOD ANAL METHOD 2014. [DOI: 10.1007/s12161-014-0061-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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