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Nanocolloidal Ru/MgF2Catalyst for Hydrogenation of Chloronitrobenzene and Toluene

100%

Pietrowski M., Zieliński M., Wojciechowska M.

Polish Journal of Chemical Technology

2014

vol. 16

issue 2

63-68

The use of magnesium fluoride support for ruthenium active phase allowed obtaining new catalysts of high activities in the hydrogenation of toluene and ortho-chloronitrobenzene. Ruthenium colloid catalysts (1 wt.% of Ru) were prepared by impregnation of the support with the earlier produced polyvinylpyrrolidone (PVP)-stabilized ruthenium colloids. The performances of the colloidal catalysts and those obtained by traditional impregnation were tested in the reactions of toluene hydrogenation to methylcyclohexane and selective hydrogenation of ortho-chloronitrobenzene (o-CNB) to ortho-chloroaniline (o-CAN). It was shown that the use of chemical reduction method allows obtaining highly monodisperse ruthenium nanoparticles of 1.6–2.6 nm in size. After reduction in hydrogen at 400oC, the colloidal ruthenium nanoparticles were found to strongly interact with MgF2 surface (SMSI), which decreased the catalyst ability to hydrogen chemisorption, but despite this, the colloid catalysts showed higher activity in o-CNB hydrogenation and higher selectivity to o-CAN than the traditional ones. It is supposed that their higher activity can be a result of high dispersion of Ru in colloid catalysts and the higher selectivity can be a consequence of the lower availability of hydrogen on the surface.

Frederik Ruysch – życie i działalność medyczna

88%

Wilemska K., Zieliński M., Jasińska M., Szynawa M., Kucharzewski M.

Annales Academiae Medicae Silesiensis

2012

vol. 66

issue 6

91-97

Needless to say, there have been a number of prominent doctors in the history of medicine. Among them, we can undoubtedly mention Frederik Ruysch who was a surgeon, an anatomy specialist, a court doctor, a professor of biology as well as the mayor of Amsterdam. Ruysch created a number of spatial compositions made up of the organs and the skeletons of people, mainly of the corpse of children, exotic birds, butterfl ies and plants. The compositions created by him in a way constitute works of art. He also prepared special substances which had preservation properties and which prevented the anatomical samples from decaying. Ruysch also created a considerable collection of anatomical samples which he showed to a wider audience twice a week at his house. In the following work, the authors will present the life and various medical activities of one of the most eccentric among medics, whose anatomical mind was way ahead of his times.

W dziejach medycyny było wielu wybitnych lekarzy. Możemy do nich zaliczyć Frederika Ruyscha, który był chirurgiem, anatomem, lekarzem sądowym, profesorem biologii, a także burmistrzem Amsterdamu. Samodzielnie sporządził kilkadziesiąt przestrzennych kompozycji, ułożonych z narządów i całych szkieletów ludzkich (głównie ze zwłok dzieci), egzotycznych ptaków, motyli i roślin. Kompozycje te stanowiły swego rodzaju dzieła sztuki. Sporządzał on płyny konserwujące, które zapobiegały rozkładowi preparatów anatomicznych. Stworzył potężną kolekcję preparatów anatomicznych, które dwa razy w tygodniu wystawiał dla szerszej publiczności w swoim domu. W pracy przedstawiono życie i działalność medyczną najbardziej ekscentrycznego pośród medyków, który z całą pewnością wyprzedzał myśl anatomiczną swoich czasów.

Permeation of iodide from iodine-enriched yeast through porcine intestine

88%

Ryszka F., Dolińska B., Zieliński M., Chyra D., Dobrzański Z.

2013

vol. 60

issue 4

737-739

Iodine deficiency is a common phenomenon, threatening the whole global human population. Recommended daily intake of iodine is 150 μg for adults and 250 μg for pregnant and breastfeeding women. About 50% of human population can be at risk of moderate iodine deficiency. Due to this fact, increased iodine supplementation is recommended, through intake of iodized mineral water and salt iodization. The aim of this study was to investigate permeation and absorption of iodide from iodine bioplex (experimental group) in comparison with potassium iodide (controls). Permeation and absorption processes were investigated in vitro using a porcine intestine. The experimental model was based on a standard Franz diffusion cell (FD-Cell). The iodine bioplex was produced using Saccharomyces cerevisiae yeast and whey powder: iodine content - 388 μg/g, total protein - 28.5%, total fat - 0.9%., glutamic acid - 41.2%, asparaginic acid - 29.4%, lysine - 24.8%; purchased from: F.Z.N.P. Biochefa, Sosnowiec, Poland. Potassium iodide was used as controls, at 388 μg iodine concentration, which was the same as in iodine-enriched yeast bioplex. A statistically significant increase in iodide permeation was observed for iodine-enriched yeast bioplex in comparison with controls - potassium iodide. After 5h the total amount of permeated iodide from iodine-enriched yeast bioplex was 85%, which is ~ 2-fold higher than controls - 37%. Iodide absorption was by contrast statistically significantly higher in controls - 7.3%, in comparison with 4.5% in experimental group with iodine-enriched yeast bioplex. Presented results show that iodide permeation process dominates over absorption in case of iodine-enriched yeast bioplex.

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1 Acta Biochimica Polonica

1 Annales Academiae Medicae Silesiensis

1 Polish Journal of Chemical Technology

1 2014

1 2013

1 2012

3 Zieliński M.

1 Chyra D.

1 Dobrzański Z.

1 Dolińska B.

1 Jasińska M.

1 Kucharzewski M.

1 Pietrowski M.

1 Ryszka F.

1 Szynawa M.

1 Wilemska K.

1 Wojciechowska M.

Search results

Nanocolloidal Ru/MgF2Catalyst for Hydrogenation of Chloronitrobenzene and Toluene

Frederik Ruysch – życie i działalność medyczna

Permeation of iodide from iodine-enriched yeast through porcine intestine