51
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Szkola A, Linares EM, Worbs S, Dorner BG, Dietrich R, Märtlbauer E, Niessner R, Seidel M. Rapid and simultaneous detection of ricin, staphylococcal enterotoxin B and saxitoxin by chemiluminescence-based microarray immunoassay. Analyst 2014; 139:5885-92. [DOI: 10.1039/c4an00345d] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Simultaneous detection of proteotoxins, ricin and SEB, and small toxin, STX, on a chemiluminescence-based microarray using anti-idiotypic antibody for STX.
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Affiliation(s)
- A. Szkola
- Chair for Analytical Chemistry & Institute of Hydrochemistry
- TU München
- 81377 Munich, Germany
| | - E. M. Linares
- Chair for Analytical Chemistry & Institute of Hydrochemistry
- TU München
- 81377 Munich, Germany
| | - S. Worbs
- Centre for Biological Threats and Special Pathogens
- Biological Toxins
- Robert Koch-Institut
- 13353 Berlin, Germany
| | - B. G. Dorner
- Centre for Biological Threats and Special Pathogens
- Biological Toxins
- Robert Koch-Institut
- 13353 Berlin, Germany
| | - R. Dietrich
- Chair of Hygiene and Technology of Milk
- LMU München
- 85764 Oberschleißheim, Germany
| | - E. Märtlbauer
- Chair of Hygiene and Technology of Milk
- LMU München
- 85764 Oberschleißheim, Germany
| | - R. Niessner
- Chair for Analytical Chemistry & Institute of Hydrochemistry
- TU München
- 81377 Munich, Germany
| | - M. Seidel
- Chair for Analytical Chemistry & Institute of Hydrochemistry
- TU München
- 81377 Munich, Germany
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52
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Wozniak B, Minta M, Stypula-Trebas S, Radko L, Zmudzki J. Evaluation of estrogenic activity in animal diets using in vitro assay. Toxicol In Vitro 2013; 28:70-5. [PMID: 24129126 DOI: 10.1016/j.tiv.2013.10.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2012] [Revised: 08/30/2013] [Accepted: 10/07/2013] [Indexed: 11/30/2022]
Abstract
A yeast estrogen bioassay (RIKILT REA) was in-house validated for feed on the 5μg 17β-estradiol-equivalents per kg level according to EC Decision 2002/657/EC. All the performance characteristics met the criteria as defined in the Decision and the REA is able to detect 17β-estradiol in animal feed at a low level of 1.15-2μgkg(-1). Subsequently, the developed and validated procedure was applied to determine the estrogenic activity in 24 feed samples intended for food producing animals, pets and laboratory animals. Two batches of rodent diet Murigran and one dog feed have been presented as a suspect, i.e. gave responses above the determined decision limit (CCα) and detection capability (CCβ). In assessing the performance of the estrogenic activity in these diets evaluated by comparison with the 17β-estradiol calibration curve, 17β-estradiol-equivalence levels of 7.07μg EEQkg(-1) and 9.54μg EEQkg(-1) in two batches of rodent diet and 5.3μg EEQkg(-1) in dog feed have been established. The activities observed in the rodent feed could be explained by chemical analysis, revealing high amounts of genistein, daidzein and trace amounts of zearalenone. In addition, the estrogenic activity in one of rodent feed was above the established CCα, but below the CCβ values established and all other samples showed no estrogenic activity with responses below the CCα value, which corresponds to levels below 2μg EEQkg(-1).
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Affiliation(s)
- Barbara Wozniak
- Department of Pharmacology and Toxicology, National Veterinary Research Institute, 24-100 Pulawy, Poland.
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53
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Fragkaki AG, Georgakopoulos C, Sterk S, Nielen MWF. Sports doping: emerging designer and therapeutic β2-agonists. Clin Chim Acta 2013; 425:242-58. [PMID: 23954776 DOI: 10.1016/j.cca.2013.07.031] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2013] [Revised: 07/30/2013] [Accepted: 07/31/2013] [Indexed: 12/12/2022]
Abstract
Beta2-adrenergic agonists, or β2-agonists, are considered essential bronchodilator drugs in the treatment of bronchial asthma, both as symptom-relievers and, in combination with inhaled corticosteroids, as disease-controllers. The use of β2-agonists is prohibited in sports by the World Anti-Doping Agency (WADA) due to claimed anabolic effects, and also, is prohibited as growth promoters in cattle fattening in the European Union. This paper reviews the last seven-year (2006-2012) literature concerning the development of novel β2-agonists molecules either by modifying the molecule of known β2-agonists or by introducing moieties producing indole-, adamantyl- or phenyl urea derivatives. New emerging β2-agonists molecules for future therapeutic use are also presented, intending to emphasize their potential use for doping purposes or as growth promoters in the near future.
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Affiliation(s)
- A G Fragkaki
- Doping Control Laboratory of Athens, Olympic Athletic Center of Athens "Spyros Louis", Kifisias 37, 15123 Maroussi, Greece.
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54
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Pilolli R, Monaci L, Visconti A. Advances in biosensor development based on integrating nanotechnology and applied to food-allergen management. Trends Analyt Chem 2013. [DOI: 10.1016/j.trac.2013.02.005] [Citation(s) in RCA: 90] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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55
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Miwa T, Yamamoto A, Saito M, Inoue Y. Retention of halogenated solutes on stationary phases containing heavy atoms. Molecules 2013; 18:5163-71. [PMID: 23648594 PMCID: PMC6270212 DOI: 10.3390/molecules18055163] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2013] [Revised: 04/29/2013] [Accepted: 05/02/2013] [Indexed: 11/16/2022] Open
Abstract
To examine the effects of weak intermolecular interactions on solid-phase extraction (SPE) and chromatographic separation, we synthesized some novel stationary phases with a heavy atom effect layer by immobilizing halogenated aromatic rings and hydroxyl groups onto the surface of a hydrophilic base polymer. Using SPE cartridges packed with the functionalized materials, we found that the heavy atom stationary phases could selectively retain halophenols in organic solvents, such as 1-propanol which blocks the hydrogen bonding, or acetonitrile which blocks the π-π interaction. The extraction efficiency of the materials toward the halophenols depended on the dipole moments of phenoxy groups present as functional groups. On the other hand, the extraction efficiency of solutes toward the functional group depended on their molar refractions, i.e., induced dipole moments. The retention of the solutes to the stationary phase ultimately depended on not only strong intermolecular interactions, but also the effects of weak interactions such as the dispersion force.
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Affiliation(s)
- Toshio Miwa
- College of Bioscience and Biotechnology, Chubu University, 1200 Matsumotocho, Kasugai-shi, Aichi 487-8501, Japan; E-Mail:
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +81-568-52-6594; Fax: +81-568-51-6196
| | - Atsushi Yamamoto
- College of Bioscience and Biotechnology, Chubu University, 1200 Matsumotocho, Kasugai-shi, Aichi 487-8501, Japan; E-Mail:
| | - Mitsuru Saito
- Nippon Filcon Co., Ltd., 2220 Ohmaru, Inagi-shi, Tokyo 206-8577, Japan; E-Mails: (M.S.); (Y.I.)
| | - Yoshinori Inoue
- Nippon Filcon Co., Ltd., 2220 Ohmaru, Inagi-shi, Tokyo 206-8577, Japan; E-Mails: (M.S.); (Y.I.)
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56
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Development of a stable biosensor based on a SiO2 nanosheet–Nafion–modified glassy carbon electrode for sensitive detection of pesticides. Anal Bioanal Chem 2013; 405:2545-52. [DOI: 10.1007/s00216-012-6634-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2012] [Revised: 11/25/2012] [Accepted: 12/06/2012] [Indexed: 10/27/2022]
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57
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McGrath TF, Campbell K, Fodey TL, O'Kennedy R, Elliott CT. An evaluation of the capability of a biolayer interferometry biosensor to detect low-molecular-weight food contaminants. Anal Bioanal Chem 2013; 405:2535-44. [PMID: 23338757 DOI: 10.1007/s00216-012-6677-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2012] [Revised: 12/14/2012] [Accepted: 12/18/2012] [Indexed: 01/25/2023]
Abstract
The safety of our food is an essential requirement of society. One well-recognised threat is that of chemical contamination of our food, where low-molecular-weight compounds such as biotoxins, drug residues and pesticides are present. Low-cost, rapid screening procedures are sought to discriminate the suspect samples from the population, thus selecting only these to be forwarded for confirmatory analysis. Many biosensor assays have been developed as screening tools in food contaminant analysis, but these tend to be electrochemical, fluorescence or surface plasmon resonance based. An alternative approach is the use of biolayer interferometry, which has become established in drug discovery and life science studies but is only now emerging as a potential tool in the analysis of food contaminants. A biolayer interferometry biosensor was assessed using domoic acid as a model compound. Instrument repeatability was tested by simultaneously producing six calibration curves showing replicate repeatability (n = 2) ranging from 0.1 to 6.5 % CV with individual concentration measurements (n = 12) ranging from 4.3 to 9.3 % CV, giving a calibration curve midpoint of 7.5 ng/ml (2.3 % CV (n = 6)). Reproducibility was assessed by producing three calibration curves on different days, giving a midpoint of 7.5 ng/ml (3.4 %CV (n = 3)). It was further shown, using assay development techniques, that the calibration curve midpoint could be adjusted from 10.4 to 1.9 ng/ml by varying assay parameters before the simultaneous construction of three calibration curves in matrix and buffer. Sensitivity of the assay compared favourably with previously published biosensor data for domoic acid.
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Affiliation(s)
- Terry F McGrath
- ASSET Technology Centre, Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, Belfast, Northern Ireland.
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58
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Kaushik A, Arya SK, Vasudev A, Bhansali S. Recent Advances in Detection of Ochratoxin-A. ACTA ACUST UNITED AC 2013. [DOI: 10.4236/ojab.2013.21001] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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59
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O’Farrell B, Haase JK, Velayudhan V, Murphy RA, Achtman M. Transforming microbial genotyping: a robotic pipeline for genotyping bacterial strains. PLoS One 2012; 7:e48022. [PMID: 23144721 PMCID: PMC3483277 DOI: 10.1371/journal.pone.0048022] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2012] [Accepted: 09/20/2012] [Indexed: 11/30/2022] Open
Abstract
Microbial genotyping increasingly deals with large numbers of samples, and data are commonly evaluated by unstructured approaches, such as spread-sheets. The efficiency, reliability and throughput of genotyping would benefit from the automation of manual manipulations within the context of sophisticated data storage. We developed a medium- throughput genotyping pipeline for MultiLocus Sequence Typing (MLST) of bacterial pathogens. This pipeline was implemented through a combination of four automated liquid handling systems, a Laboratory Information Management System (LIMS) consisting of a variety of dedicated commercial operating systems and programs, including a Sample Management System, plus numerous Python scripts. All tubes and microwell racks were bar-coded and their locations and status were recorded in the LIMS. We also created a hierarchical set of items that could be used to represent bacterial species, their products and experiments. The LIMS allowed reliable, semi-automated, traceable bacterial genotyping from initial single colony isolation and sub-cultivation through DNA extraction and normalization to PCRs, sequencing and MLST sequence trace evaluation. We also describe robotic sequencing to facilitate cherrypicking of sequence dropouts. This pipeline is user-friendly, with a throughput of 96 strains within 10 working days at a total cost of < €25 per strain. Since developing this pipeline, >200,000 items were processed by two to three people. Our sophisticated automated pipeline can be implemented by a small microbiology group without extensive external support, and provides a general framework for semi-automated bacterial genotyping of large numbers of samples at low cost.
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Affiliation(s)
- Brian O’Farrell
- Environmental Research Institute, University College Cork, Cork, Ireland
- * E-mail: (MA); (JKH); (BOF)
| | - Jana K. Haase
- Environmental Research Institute, University College Cork, Cork, Ireland
- * E-mail: (MA); (JKH); (BOF)
| | | | - Ronan A. Murphy
- Environmental Research Institute, University College Cork, Cork, Ireland
| | - Mark Achtman
- Environmental Research Institute, University College Cork, Cork, Ireland
- * E-mail: (MA); (JKH); (BOF)
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60
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Trace analysis of pollutants by use of honeybees, immunoassays, and chemiluminescence detection. Anal Bioanal Chem 2012; 405:555-71. [DOI: 10.1007/s00216-012-6443-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2012] [Revised: 08/27/2012] [Accepted: 09/20/2012] [Indexed: 10/27/2022]
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