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Drábová L, Pulkrabová J, Hrbek V, Kocourek V, Hajšlová J. POPs and PAHs in fish oil-based food supplements at the Czech market. Food Addit Contam Part B Surveill 2023; 16:197-208. [PMID: 37055876 DOI: 10.1080/19393210.2023.2200374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Accepted: 04/03/2023] [Indexed: 04/15/2023]
Abstract
The objectives of this study were to assess concentrations of three groups of persistent organic pollutants (POPs) and polycyclic aromatic hydrocarbons (PAHs) in 44 fish oil-based food supplements, to estimate their daily intake by consumers and, to evaluate the compliance of the oil samples with the oil origin declarations (cod liver oil or fish oil). The concentrations of ∑PCBs (7 congeners), OCPs (19 compounds, represented mainly by ∑DDTs), ∑PBDEs (10 congeners), and ∑PAHs (16 compounds) found in samples ranged between 0.15-55.7 µg kg-1, 0.93-72.8 µg kg-1, 0.28-27.5 µg kg-1, and 0.32-51.9 µg kg-1, respectively. Besides, the authenticity of the oils was assessed based on the fingerprints obtained by DART-HRMS, an ambient mass spectrometry technique. Four samples declared as fish oil were probably prepared from cod liver oil, which is much cheaper. Furthermore, these samples contained elevated concentrations of halogenated POPs when compared to supplements produced from fish oil.
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Affiliation(s)
- Lucie Drábová
- Faculty of Food and Biochemical Technology, Department of Food Analysis and Nutrition, University of Chemistry and Technology, Prague, Czech Republic
| | - Jana Pulkrabová
- Faculty of Food and Biochemical Technology, Department of Food Analysis and Nutrition, University of Chemistry and Technology, Prague, Czech Republic
| | - Vojtěch Hrbek
- Faculty of Food and Biochemical Technology, Department of Food Analysis and Nutrition, University of Chemistry and Technology, Prague, Czech Republic
| | - Vladimír Kocourek
- Faculty of Food and Biochemical Technology, Department of Food Analysis and Nutrition, University of Chemistry and Technology, Prague, Czech Republic
| | - Jana Hajšlová
- Faculty of Food and Biochemical Technology, Department of Food Analysis and Nutrition, University of Chemistry and Technology, Prague, Czech Republic
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Kulišová M, Maťátková O, Brányik T, Zelenka J, Drábová L, Kolouchová IJ. Detection of microscopic filamentous fungal biofilms - Choosing the suitable methodology. J Microbiol Methods 2023; 205:106676. [PMID: 36693497 DOI: 10.1016/j.mimet.2023.106676] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 01/18/2023] [Accepted: 01/18/2023] [Indexed: 01/22/2023]
Abstract
Microscopic filamentous fungi are ubiquitous microorganisms that adapt very easily to a variety of environmental conditions. Due to this adaptability, they can colonize a number of various surfaces where they are able to start forming biofilms. Life in the form of biofilms provides them with many benefits (increased resistance to desiccation, UV radiation, antimicrobial compounds, and host immune response). The aim of this study is to find a reliable and reproducible methodology to determine biofilm growth of selected microscopic filamentous fungi strains. Several methods (crystal violet staining, MTT assay, XTT assay, resazurin assay) for the determination of total biofilm biomass and its metabolic activity were tested on four fungi - Alternaria alternata, Aspergillus niger, Fusarium culmorum and Fusarium graminearum, and their biofilm was also imaged by spinning disc confocal microscopy using fluorescent dyes. A reproducible biofilm quantification method is essential for the subsequent testing of the biofilm growth suppression using antifungal agents or physical methods. Crystal violet staining was found to be a suitable method for the determination of total biofilm biomass of selected strains, and the MTT assay for the determination of metabolic activity of the biofilms. Calcofluor white and Nile red fluorescent stains successfully dyed the hyphae of microscopic fungi.
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Affiliation(s)
- Markéta Kulišová
- Department of Biotechnology, University of Chemistry and Technology, Prague, Technická 5, Prague 166 28, Czech Republic.
| | - Olga Maťátková
- Department of Biotechnology, University of Chemistry and Technology, Prague, Technická 5, Prague 166 28, Czech Republic.
| | - Tomáš Brányik
- Research Institute of Brewing and Malting, Lipová 511/15, Prague 120 44, Czech Republic.
| | - Jaroslav Zelenka
- Department of Biochemistry and Microbiology, University of Chemistry and Technology, Prague, Technická 5, Prague 166 28, Czech Republic.
| | - Lucie Drábová
- Department of Food Analysis and Nutrition, University of Chemistry and Technology, Prague, Technická 5, Prague 166 28, Czech Republic.
| | - Irena Jarošová Kolouchová
- Department of Biotechnology, University of Chemistry and Technology, Prague, Technická 5, Prague 166 28, Czech Republic.
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Drábová L, Libenská L, Zedníková M, Vondrášková V, Hajšlová J, Pulkrabová J. Analysis of UV-Treated Mushrooms: Dietary Source of Vitamin D2? LCGC Eur 2022. [DOI: 10.56530/lcgc.eu.wi6189z4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In recent years, dietary intake of vitamin D has become an issue of high concern because this bioactive molecule boosts the immune system and is presumed to provide some protection against Covid-19. Under these conditions, a search for nontraditional dietary sources has appeared as a new challenge. One of the possibilities is irradiation of champignons that contain a high amount of ergosterol, a vitamin D2 precursor. In our study, a fast and sensitive liquid chromatography coupled to tandem mass spectrometry (LC–MS/MS) method for the determination of vitamin D2 in fresh mushrooms and its metabolite 25(OH)D2 in the blood of volunteers regularly consuming UV-treated mushrooms has been introduced. For extraction of desiccated mushrooms, solid-liquid extraction n-hexane–ethyl acetate was used, and n-hexane was employed for blood plasma samples. Separation of target analytes was performed on a polymeric bonding C18 phase column. Satisfactory limits of quantification (LOQs) were reached both for the control of vitamin D2 content in mushrooms (LOQ = 10 ng/g) and for the monitoring of vitamin D2 and D3 metabolite in human blood (LOQ = 2.5 ng/mL). For accurate quantification, isotopic dilution was employed.
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Drábová L, Dvořáková D, Urbancová K, Gramblička T, Hajšlová J, Pulkrabová J. Critical Assessment of Clean-Up Techniques Employed in Simultaneous Analysis of Persistent Organic Pollutants and Polycyclic Aromatic Hydrocarbons in Fatty Samples. Toxics 2022; 10:toxics10010012. [PMID: 35051054 PMCID: PMC8781265 DOI: 10.3390/toxics10010012] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 12/22/2021] [Accepted: 12/27/2021] [Indexed: 12/04/2022]
Abstract
Interference of residual lipids is a very common problem in ultratrace analysis of contaminants in fatty matrices. Therefore, quick and effective clean-up techniques applicable to multiple groups of analytes are much needed. Cartridge and dispersive solid-phase extraction (SPE and dSPE) are often used for this purpose. In this context, we evaluated the lipid clean-up efficiency and performance of four commonly used sorbents—silica, C18, Z-Sep, and EMR-lipid—for the determination of organic pollutants in fatty fish samples (10%) extracted using ethyl acetate or the QuEChERS method. Namely, 17 polychlorinated biphenyls (PCBs), 22 organochlorine pesticides (OCPs), 13 brominated flame retardants (BFRs), 19 per- and polyfluoroalkyl substances (PFAS), and 16 polycyclic aromatic hydrocarbons (PAHs) were determined in this study. The clean-up efficiency was evaluated by direct analysis in real time coupled with time-of-flight mass spectrometry (DART-HRMS). The triacylglycerols (TAGs) content in the purified extracts were significantly reduced. The EMR-lipid sorbent was the most efficient of the dSPE sorbents used for the determination of POPs and PAHs in this study. The recoveries of the POPs and PAHs obtained by the validated QuEChERS method followed by the dSPE EMR-lipid sorbent ranged between 59 and 120%, with repeatabilities ranging between 2 and 23% and LOQs ranging between 0.02 and 1.50 µg·kg−1.
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Drábová L, Mráz P, Krátký F, Uttl L, Vacková P, Schusterova D, Zadražilová B, Kadlec V, Kocourek V, Hajšlová J. Assessment of pesticide residues in citrus fruit on the Czech market. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2021; 39:311-319. [PMID: 34871518 DOI: 10.1080/19440049.2021.2001579] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
When assessing citrus fruit quality, besides natural health-promoting compounds, attention also has to be paid to residues of chemicals used to protect fruit against various pests. A set of 49 samples of different types of citrus fruits collected at the Czech market were analysed for 460 pesticide residues using LC-MS/MS and GC-MS/MS methods. While no residues were detected in citruses from organic farming, altogether 38 various pesticide residues were detected in conventional production samples. Buprofezin in two grapefruit samples and fenbutatin oxide in one tangerine sample exceeded maximum residue limits (MRLs). Depending on the pesticide group, 10-70% of residues were found in pulp, this means that their processing factors calculated for peeling are in the range of 0.02-0.76. In the case of a beverage prepared from unpeeled lemon slices, the transfer of residues from contaminated fruit into infusion was, depending on the beverage type and processing conditions, in the range of 8-61%.
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Affiliation(s)
- Lucie Drábová
- Faculty of Food and Biochemical Technology, Department of Food Analysis and Nutrition, University of Chemistry and Technology, Prague, Prague 6, Czech Republic
| | - Petr Mráz
- Faculty of Food and Biochemical Technology, Department of Food Analysis and Nutrition, University of Chemistry and Technology, Prague, Prague 6, Czech Republic
| | - František Krátký
- Faculty of Food and Biochemical Technology, Department of Food Analysis and Nutrition, University of Chemistry and Technology, Prague, Prague 6, Czech Republic
| | - Leoš Uttl
- Faculty of Food and Biochemical Technology, Department of Food Analysis and Nutrition, University of Chemistry and Technology, Prague, Prague 6, Czech Republic
| | - Petra Vacková
- Faculty of Food and Biochemical Technology, Department of Food Analysis and Nutrition, University of Chemistry and Technology, Prague, Prague 6, Czech Republic
| | - Dana Schusterova
- Faculty of Food and Biochemical Technology, Department of Food Analysis and Nutrition, University of Chemistry and Technology, Prague, Prague 6, Czech Republic
| | - Barbora Zadražilová
- Faculty of Food and Biochemical Technology, Department of Food Analysis and Nutrition, University of Chemistry and Technology, Prague, Prague 6, Czech Republic
| | - Václav Kadlec
- Faculty of Food and Biochemical Technology, Department of Food Analysis and Nutrition, University of Chemistry and Technology, Prague, Prague 6, Czech Republic
| | - Vladimír Kocourek
- Faculty of Food and Biochemical Technology, Department of Food Analysis and Nutrition, University of Chemistry and Technology, Prague, Prague 6, Czech Republic
| | - Jana Hajšlová
- Faculty of Food and Biochemical Technology, Department of Food Analysis and Nutrition, University of Chemistry and Technology, Prague, Prague 6, Czech Republic
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