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Determination of aristolochic acid by capillary zone electrophoresis

100%
Kvasnička F., Ševčík R., Voldřich M., Krátká J.
Open Chemistry
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2004
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vol. 2
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issue 3
417-424
EN
A simple and rapid capillary zone electrophoresis (CZE) method for the determination of aristolochic acid (AA) in dietary supplements and selected herbs is described. A clear separation of AA from other sample constituents was achieved within 5 minutes without any sample clean up. A mixture of 20 mM-morpholinethanesulphonic acid+10 mM-BisTrisPropane+0.2% hydroxyethylcelullose in 10% methanol serves as a background electrolyte. The linearity, accuracy, intra-assay and detection limit of the developed method are 200–6000 ng/mL, 95–103%, 3.5%, and 50 ng/ml, respectively. Ease of use, sufficient sensitivity and low running cost are the most important attributes of the CZE method. The proposed CZE method was compared with HPLC.
2
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Determination of imazalil by on-line coupled capillary isotachophoresis with capillary zone electrophoresis

100%
Kvasnička F., Dobiáš J., Klaudisová-Chudáčková K.
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EN
A simple, rapid and reproducible capillary isotachophoretic on-line coupled with capillary zone electrophoresis (CITP-CZE) method for the determination of IMz in food packaging extracts and its residues in apples is described. A good separation of the IMZ from other sample constituents was achieved within 15 minutes without any sample clean up. Method characteristics (linearity, accuracy, intra-assay and detection limit) were determined. Less amount of time involved, sufficient sensitivity and low running cost are the important attributes of CITP-CZE method.
3
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Occurrence of 2-phenylphenol in food paper packages

88%
Votavová L., Hanušová K., Vápenka L., Dobiáš J., Kvasnička F.
Open Chemistry
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2014
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vol. 12
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issue 11
1162-1168
EN
Twenty three paper based packaging materials commercially used for food packaging in the Czech Republic were analysed with regard to 2-phenylphenol (OPP) content using HPLC technique with fluorimetric detection. The HPLC method was modified with the aim to increase its sensitivity. OPP was detected in quantities ranging from 10 mg kg−1 to 527 mg kg−1 in twenty tested samples. The level of OPP in packaging materials was in close correlation to the content of recycled pulp in used paper material. The migration of OPP from two packaging materials comprised of paperboard coated with low density polyethylene (LDPE) into food simulants was determined at 40°C for 10 days. The levels of migration into 3% acetic acid, 10% ethanol and olive oil were below the limit of detection of used analytical procedure. In the case of 95% ethanol, 13% and 21% of OPP present in tested samples were transferred into simulant. The found occurrence of OPP in paper packages does not pose any significant safety risk for food consumer, but OPP could be considered as wide spread contaminant in paper materials.
4
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Determination of inorganic oxyhalides in drinking water by on-line coupled capillary isotachophoresis- capillary zone electrophoresis

88%
Kvasnička F., Janda V., Rousová D., Manda J., Kollerová L.
Open Chemistry
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2005
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vol. 3
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issue 1
137-145
EN
Some oxyhalides can be found in drinking waters as inorganic disinfection byproducts. An on-line coupled capillary isotachophoresis-capillary zone electrophoresis (CITP-CZE) method was developed for the analysis of chlorate, chlorite and bromate in water. The optimized CITP-CZE electrolyte system consisted of the following: 10 mM-HCl+20 mM-β-Alanine (leading electrolyte), 5 mM-succinic acid (terminating electrolyte), and 10 mM-succinic acid +5 mM-β-Alanine +0.1% HPMC (carrier electrolyte). A clear separation of oxyhalides from other components of drinking water was achieved within 25 min. Method characteristics, i.e., linearity (0–200 ng/mL), accuracy (88–110%), intra-assay (3–5%), quantification limit (5–15 ng/mL), and detection limit (2–5 ng/mL), were determined. Minimum labor requirements, sufficient sensitivity and low running cost are important attributes of this method. It was found that the developed method is useful for the routine analysis of oxyhalides in water.
5
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Erratum to: “Occurrence of 2-phenylphenol in food paper packages”

88%
Votavová L., Hanušová K., Vápenka L., Dobiáš J., Kvasnička F.
Open Chemistry
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2014
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vol. 12
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issue 12
1304-1305
EN
The original version of the article was published in Cent. Eur. J. Chem. 12(11) (2014) pp. 1162–1168. Unfortunately, the original version of this article contains some mistakes in the Tables 2 and 3. Corrected versions of the tables are presented below.
6
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Determination of phenolic acids by capillary zone electrophoresis and HPLC

76%
Kvasnička F., Čopíková J., Ševčík R., Krátká J., Syntytsia A., Voldřich M.
Open Chemistry
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2008
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vol. 6
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issue 3
410-418
EN
Selected phenolic acids are determined by capillary zone electrophoresis and HPLC, each using UV detection. The optimised CZE background electrolyte contained 50 mM acetic acid, 95 mM 6-aminocaproic acid, 0.1% polyacrylamide, 1% polyvinylpyrrolidone, and 10% methanol. Twelve phenolic acids (gallic, p-hydroxybenzoic, 3,4-dihydroxybenzoic, vanillic, syringic, o-coumaric, p-coumaric, caffeic, sinapic, ferulic, salicylic and chlorogenic) were separated within 10 minutes. Chromatographic separation of these phenolic acids was carried out on an Eclipse XBD C8 column using a mobile phase gradient (acetonitrile / methanol / water / 0.1% phosphoric acid); all were separated within 25 minutes. Electrophoretic and chromatographic determinations of ferulic and chlorogenic acids were compared on barley, malt, and potato samples. The methods’ characteristics were: linearity (1–20 mg ml and 0.2–4 mg ml−1), accuracy (recovery 94 ± 5% and 96 ± 4%), intra-assay repeatability (4.1% and 3.5%), and detection limit (0.2 and 0.02 mg ml−1). [...]
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