Year 2012

• Application of dispersive liquid-liquid microextraction for the determination of selected organochlorine pesticides in honey by gas chromatography - mass spectrometry

  Publication

  • M. Kujawski
  • E. Pinteaux
  • J. Namieśnik

  - EUROPEAN FOOD RESEARCH AND TECHNOLOGY - Year 2012

  Dispersive liquid-liquid microextraction (DLLME) is a rapid and easy technique that consumes minute amounts of organic solvents. In this work, we present chemometric study on optimization of DLLME parameters for the extraction of aldrin, endrin, lindane, alfa-endosulfan, 4,4'-DDT and its metabolites from honey matrix. Method quantification limits (MQLs) vary between 0.3 ng/g for 2,4'-DDE and 4,4'-DDE to 13.2 ng/g for alfa-endosulfan...

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Year 2011

• Levels of 13 multi-class pesticide residues in Polish honeys determined by LC-ESI-MS/MS

  Publication

  • M. Kujawski
  • J. Namieśnik

  - FOOD CONTROL - Year 2011

  Levels of 13 pesticides in 40 honey samples form Poland are reported. A rapid and sensitive method was developed for the LC-ESI-MS/MS determination of multi-class pesticide residues in honey samples. Liquid-liquid extraction (LLE) on a diatomaceous earth support (requiring the use of small amounts of organic solvent), followed by chromatographic separation on a C18 column and gradient elution were employed. The method quantifies...

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• Nowe metody do badań składników obcych w miodach pszczelich

  Publication

  • M. Kujawski

  - Year 2011

  Pszczoły, zbierając nektar, pyłek kwiatowy i spadź narażone są na częsty kontakt ze szkodliwymi substancjami (stosowanymi w rolnictwie) osadzonymi na roślinach i przenoszą te zanieczyszczenia - na powierzchni ciała lub wraz z pożytkami - do ula, i w konsekwencji zanieczyszczenia przedostają się do miodu.W związku z możliwością zanieczyszczenia miodu przez pestycydy należące do różnych klas związków chemicznych, pomocne okazuje...

• Permeation and sorption properties of poly(ether-block-amide) membranesfilled by two types of zeolites

  Publication

  • K. Friess
  • V. Hynek
  • M. ŠíPEK
  • W. Kujawski
  • O. Vopička
  • M. Zgažar
  • M. Kujawski

  - SEPARATION AND PURIFICATION TECHNOLOGY - Year 2011

  The experimental study of transport properties of mixed matrix membranes (MMMs) based on PEBA-4033 with two types of zeolites is reported. Gas (CO2, O2, N2) and vapor (benzene, toluene, methanol, water) permeation measurements were performed using the differential flow permeameter at temperature of 298.15 K and at atmospheric pressure. Gas/vapor permeation was monitored by measuring the changes of the thermal conductivity of carrier...

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Year 2009

• Miód pszczeli, obiekt zainteresowania analityków

  Publication

  • M. Kujawski
  • J. Namieśnik

  - Analityka: Nauka i Praktyka - Year 2009

  W pracy przedstawiona została charakterystyka organoleptyczna miodów odmianowych i ich działanie wspomagające w leczeniu różnych schorzeń, omówione zostały skład chemiczny miodu i rodzaje przeprowadzanych analiz oraz podano główne źródła zanieczyszczenia miodu.

Year 2008

• Challenges in preparing honey samples for chromatographic determination of contaminants and trace residues

  Publication

  • M. Kujawski
  • J. Namieśnik

  - TRAC-TRENDS IN ANALYTICAL CHEMISTRY - Year 2008

  The determination of contaminations and residues in honey is of growing concern over past few years, especially that these compounds can not only diminish beneficial properties of honey but more importantly, if present in significant amounts, can pose serious threat to human health. Since honey is characterized by complex composition of the matrix sample, it is often necessary to apply clean-up step, in order to eliminate interfering...

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