Browsing by Author "Švec František"
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- Item3D-Printed Magnetic Stirring Cages for Semidispersive Extraction of Bisphenols from Water Using Polymer Micro- and Nanofibers(ACS Publications, 2020) Šrámková Ivana; Horstkotte Burkhard; Erben Jakub; Chvojka Jiří; Švec František; Solich Petr; Šatínský Dalibor
- ItemA comparison study of nanofiber, microfiber, and new composite nano/microfiber polymers used as sorbents for on-line solid phase extraction in chromatography system(Elsevier Ltd., 2018) Hakova Martina; Chocholousova Havlikova Lucie; Chvojka Jiří; Erben Jakub; Solich Petr; Švec FrantišekThree different approaches has been used to obtain nano/micro fibers and their diversity and extraction properties were examined. The effect of their structure on stability in an ultra-high-performance liquid chromatography (UHPLC) system during on-line SPE procedure was monitored. Five types of various nano/micro fiber polymers were used as sorbents: polyamide 6 nanofibers, polyvinylidene difluoride nanofibers, polyethylene microfibers, and two new polycaprolactone microfiber/nanofiber and polycaprolactone microfibers/polyvinylidene difluoride nanofibers composite polymers. The fiber polymers were filled in a cartridge directly connected to the UHPLC system and tested. For each polymer, the optimal conditions of the on-line extraction were found and potential applicability on real samples was tested. The determination of ochratoxin A (OTA) in beer matrix was chosen as a case study. Relevant factors such as the mechanical and chemical stability of the nano/microfibers, filling the cartridges, fiber reusability and the possibility and the repeatability of all processes were involved in the proposed study. A new nano/micro composite sorbent consisting of polycaprolactone microfibers/polyvinylidene difluoride nanofibers was chosen as the most suitable sorbent for the on-line extraction of OTA from a beer matrix. The tested validation parameters had the value of intra-day precision lower than 1.48%, linearity in the range from 0.5 to 100 μg L−1 with r2 ≥ 0.9999 for standard and matrix calibration curve, and recovery in the range 99.1–103.9% at five concentration levels. Long-term precision evaluated for 31 analyses over the period of three months did not exceed 2.9% RSD. It confirmed the column reusability and perfect stability of nano/micro composite sorbent in the presence of organic solvents and after repeated injection of a complex beer matrix.
- ItemComparison study of nanofibers, composite nano/microfiber materials, molecularly imprinted polymers, and core-shell sorbents used for on-line extraction-liquid chromatography of ochratoxins in Tokaj wines(Elsevier, 2021) Kholová Aneta; Lhotská Ivona; Erben Jakub; Chvojka Jiří; Švec František; Šolich Petr; Šatínský Dalibor
- ItemNanofiber polymers as novel sorbents for on-line solid phase extraction in chromatographic system: A comparison with monolithic reversed phase C18 sorbent(Elsevier Ltd, 2018) Hakova Martina; Chocholousova Havlikova Lucie; Chvojka Jiří; Švec František; Solich Petr; šatinský Dalibor
- ItemOn-line polydopamine coating as a new way to functionalize fibrous sorbent for solid phase extraction(Elsevier, 2020) Hakova Martina; Chocholouš Petr; Valachovič Adam; Erben Jakub; Chvojka Jiří; Solich Petr; Švec František; Šatínský Dalibor
- ItemPoly-&epsi-caprolactone Nanofibrous Polymers: A Simple Alternative to Restricted Access Media for Extraction of Small Molecules from Biological Matrixes(ACS Publications, 2020) Raabová Hedvika; Hakova Martina; Chocholousova Havlikova Lucie; Erben Jakub; Chvojka Jiří; Solich Petr; Švec František; Šatínský Dalibor
- ItemPolycaprolactone Composite Micro/Nanofibrous Material as an Alternative to Restricted Access Media for Direct Extraction and Separation of Non-Steroidal Anti-Inflammatory Drugs from Human Serum Using Column-Switching Chromatography(MDPI, 2021) Raabová Hedvika; Chocholousova Havlikova Lucie; Erben Jakub; Chvojka Jiří; Švec František; Šatínský Dalibor
- ItemThe role of pKa, log P of analytes, and protein matrix in solid-phase extraction using native and coated nanofibrous and microfibrous polymers prepared via meltblowing and combined meltblowing/electrospinning technologies(Elsevier, 2021) Raabová Hedvika; Erben Jakub; Chvojka Jiří; Šolich Petr; Švec František; Šatínský Dalibor