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1.

001-es BibID:	BIBFORM086424
Első szerző:	Farkas Etelka (vegyész)
Cím:	Dihydroxamate based siderophore model, piperazine-1,4-bis-(N-methyl-acetohydroxamic acid (PIPDMAHA), as a chelating agent of molybdenum(VI) / Etelka Farkas, Hajnalka Csóka, Sofia Gama, Amélia M. Santos
Dátum:	2002
ISSN:	0039-9140 1873-3573
Megjegyzések:	Equilibrium studies based on pH?potentiometric and spectrophotometric measurements as well as some theoretical simulations are reported for the complexes of Mo(VI) with a dihydroxamate type siderophore analogue, the piperazine-1,4-bis-(N-methyl-acetohydroxamic acid) (PIPDMAHA). It has been found that the complexation process starts below pH 2 and that PIPDMAHA forms more stable O,O-hydroxamate bis-chelated complexes with Mo(VI) than any of the formerly studied dihydroxamic acids. The experimental data were fitted with two complexation models based either on dinuclear or on mononuclear species. However, ESI-MS showed that the dimmer is much more abundant than the monomer. This feature was further suggested by theoretical simulation studies, which indicated the dimeric species is more stable than the monomeric one.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Siderophore analogues Molybdenum Hydroxamic acid Chelating agent
Megjelenés:	Talanta. - 57 : 5 (2002), p. 935-943. -
További szerzők:	Csóka Hajnalka Gama, Sofia Santos, Amélia M.
Pályázati támogatás:	T23612 OTKA
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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2.

001-es BibID:	BIBFORM071904
Első szerző:	Kecskeméti Ádám (vegyész)
Cím:	Particle-based immobilized enzymatic reactors in microfluidic chips / Kecskemeti Adam, Gaspar Attila
Dátum:	2018
ISSN:	0039-9140
Megjegyzések:	The research and applications of immobilized enzyme reactors (IMERs) have become more and more widespread due to the numerous advantages like reusability, easy handling, prolonged lifetime, easy separation from pro- ducts and substrate specificity. The miniaturized form of these reactors (microchip IMERs) received outstanding attention due to their special features and advantages over the traditional, larger analytical systems. Large specific surface is essential for the efficient operation of the microreactors, thus these devices include one of the several types of porous solid supports, but in this work only the particle based microchip IMERs are reviewed. A very large variety of micro- or nanoparticles (beads) have been used in the microchip IMERs, however, in- corporating these particles into microchips is still a challenge, because the common procedures used for the preparation of chromatographic columns are not well applicable at the microscopic level. Many detection systems were applied with microchip IMERs using on-chip or off-chip arrangement. The combination of microchip IMERs with mass spectrometry is particularly popular, because in these systems high- throughput analysis can be achieved by which the proteomic studies can be largely accelerated. In most chip IMER-MS systems, the chips are used for sample pretreatment including analyte (protein) digestion, pre- concentration of analyte, removal of matrix materials. Additional applications of the IMERs - like the rapid protein digestion with proteolytic enzymes, the transformation of analytes to a more easily or more sensitively measurable form (detection signal amplification) and the design of microarrays/biosensors to analyze antigens based on specific interactions in immunoanalytical studies ? are also reviewed.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban Microfluidic Enzyme reactor Particle Enzyme immobilization Protein digestion
Megjelenés:	Talanta. - 180 (2018), p. 211-228. -
További szerzők:	Gáspár Attila (1970-) (vegyész, kémikus)
Pályázati támogatás:	OTKA-111932 OTKA ÚNKP-17-3 Egyéb GINOP-2.3.3-15-2016-00004 GINOP GINOP-2.3.2-15-2016-00008 GINOP
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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3.

001-es BibID:	BIBFORM068560
Első szerző:	Kecskeméti Ádám (vegyész)
Cím:	Preparation and characterization of a packed bead immobilized trypsin reactor integrated into a PDMS microfluidic chip for rapid protein digestion / Ádám Kecskeméti, Attila Gáspár
Dátum:	2017
ISSN:	0039-9140
Megjegyzések:	This paper demonstrates the design, efficiency and applicability of a simple, inexpensive and high samplethroughput microchip immobilized enzymatic reactor (IMER) for rapid protein digestion. The IMER containsconventional silica particles with covalently immobilized trypsin packed inside of a poly(dimethylsiloxane)(PDMS) microchip channel (10 mm?1 mm?35 ?m). The microchip consists of 9 different channels, enabling 9simultaneous protein digestions. Trypsin was covalently immobilized using carbodiimide activation, the idealtrypsin/silica particle ratio (i.e. measured mass ratio before the immobilization reaction) was determined. Theamount of immobilized trypsin was 10?15 ?g trypsin for 1 mg silica particle. Migration times of CZE peptidemaps showed good repeatability and reproducibility (RSD%=0.02?0.31%). The IMER maintained its activity for2 months, in this period it was used effectively for rapid proteolysis. Four proteins (myoglobin, lysozyme,hemoglobin and albumin) in a wide size range (15?70 kDa) were digested to demonstrate the applicability ofthe reactor. Their CZE peptide maps were compared to peptide maps obtained from standard in-solutiondigestion of the four proteins. The number of peptide peaks correlated well with the theoretically expectedpeptide number in both cases, the peak patterns of the electropherograms were similar, however, digestion withthe microchip IMER requires only < 10 s, while in-solution digestion takes 16 h. LC-MS/MS peptide mappingwas also carried out, the four proteins were identified with satisfying sequence coverages (29?50%), trypsinautolysis peptides were not detected. The protein content of human serum was digested with the IMER and within-solution digestion.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban Trypsin immobilization Protein digestion Peptide mapping Microchip reactor
Megjelenés:	Talanta. - 166 (2017), p. 275-283. -
További szerzők:	Gáspár Attila (1970-) (vegyész, kémikus)
Pályázati támogatás:	OTKA-111932 OTKA NTP-NFTÖ-16-0038 Egyéb GINOP-2.3.2-15-2016-00008 GINOP GINOP-2.3.3-15-2016-00004 GINOP
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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4.

001-es BibID:	BIBFORM016471
Első szerző:	Kocúrová, Lívia
Cím:	A novel approach in dispersive liquid-liquid microextraction based on the use of an auxiliary solvent for adjustment of density UV-VIS spectrophotometric and graphite furnace atomic absorption spectrometric determination of gold based on ion pair formation / Lívia Kocúrová, Ioseph S. Balogh, Jana Škrlíková, József Posta, Vasil Andruch
Dátum:	2010
ISSN:	0039-9140
Megjegyzések:	This paper presents a novel approach to dispersive liquid-liquid microextraction (DLLME), based on the use of an auxiliary solvent for the adjustment of density. The procedure utilises a solvent system consisting of a dispersive solvent, an extraction solvent and an auxiliary solvent, which allows for the use of solvents having a density lower than that of water as an extraction solvent while preserving simple phase separation by centrifugation. The suggested approach could be an alternative to procedures described in the literature in recent months and which have been devoted to solving the same problem. The efficiency of the suggested approach is demonstrated through the determination of gold based on the formation of the ion pair [Au(CN)(2)](-) anion with Astra Phloxine (R) reagent and its extraction using the DLLME procedure with subsequent UV-VIS spectrophotometric and graphite furnace atomic absorption spectrometric detection. The optimum conditions were found to be: pH 3; 0.8 mmol L-1 K-4[Fe(CN)(6)]; 0.12 mmol L-1 R; dispersive solvent, methanol; extraction solvent, toluene; auxiliary solvent, tetrachloromethane. The calibration plots were linear in the ranges 0.39-4.7 mg L-1 and 0.5-39.4 mu g L-1 for UV-VIS and GFAAS detection, respectively; thus enables the application of the developed method in two ranges differing from one from another by three orders of magnitude. The presented approach can be applied to the development of DLLME procedures for the determination of other compounds extractable by organic solvents with a density lower than that of water. (C) 2010 Elsevier B.V. All rights reserved.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban Dispersive liquid-liquid microextraction Auxiliary solvent Ion pair Gold UV-VIS spectrophotometry Graphite furnace atomic absorption spectrometry mass-spectrometry water samples
Megjelenés:	Talanta (Oxford). - 82 : 5 (2010), p. 1958-1964. -
További szerzők:	Balogh Ioseph S. Škrlíková, Jana Posta József (1948-) (vegyész, analitikus) Andruch, Vasil
Internet cím:	DOI Intézményi repozitóriumban (DEA) tárolt változat
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5.

001-es BibID:	BIBFORM104171
035-os BibID:	(WoS)000449443900033 (Scopus)85053715653
Első szerző:	Kuki Ákos (villamosmérnök)
Cím:	Rapid mapping of various chemicals in personal care and healthcare products by direct analysis in real time mass spectrometry / Ákos Kuki, Georgina Zelei, Lajos Nagy, Tibor Nagy, Miklós Zsuga, Sándor Kéki
Dátum:	2019
ISSN:	0039-9140 1873-3573
Megjegyzések:	Residual chemicals on personal care and healthcare products, such as sanitary articles, sterile gauze bandages, nappies, plasters, were studied by direct analysis in real time mass spectrometry (DART-MS). We have identified around 40 compounds in seventeen different commercially available items. The tentative identification was further supported for about half of the chemicals by tandem mass spectrometric experiments (DART MS/MS). The most notable hazardous substances were tributyl phosphate, tris(2,4-di-tert-butylphenyl) phosphite, phthalic acid esters, erucamide, and nonylphenol ethoxylates (NPEs). In addition, we developed an efficient DART-MS analysis to determine the concentration of NPE in a swab sample. The quantitative result obtained by DART-MS was confirmed by liquid chromatography with mass spectrometric detection (LC-MS).
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Direct analysis in real time (DART) tandem mass spectrometry Hazardous substances Nonylphenol ethoxylate (NPE) Personal care and healthcare products Phthalic acid ester (phthalate) Semi-quantitative analysis
Megjelenés:	Talanta. - 192 (2019), p. 241-247. -
További szerzők:	Zelei Georgina Nagy Lajos (1979-) (vegyész) Nagy Tibor (1988-) (vegyész) Zsuga Miklós (1944-) (polimer kémikus) Kéki Sándor (1964-) (polimer kémikus)
Pályázati támogatás:	OTKA-116465 OTKA GINOP-2.3.2-15-2016-00041 GINOP GINOP-2.3.3-15-2016-00004 GINOP
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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6.

001-es BibID:	BIBFORM096005
Első szerző:	Nagy Miklós (vegyész)
Cím:	Isocyanonaphthalenes as extremely low molecular weight, selective, ratiometric fluorescent probes for Mercury(II) / Miklós Nagy, Sándor Lajos Kovács, Tibor Nagy, Dávid Rácz Miklós Zsuga, Sándor Kéki
Dátum:	2019
ISSN:	0039-9140 1873-3573
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Talanta. - 201 (2019), p. 165-173. -
További szerzők:	Kovács Sándor Lajos (1993-) (vegyészmérnök) Nagy Tibor (1988-) (vegyész) Rácz Dávid (1987-) (vegyész) Zsuga Miklós (1944-) (polimer kémikus) Kéki Sándor (1964-) (polimer kémikus)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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7.

001-es BibID:	BIBFORM112594
035-os BibID:	(Scopus)0007797352 (WOS)A1983RL54000016
Első szerző:	Szabó Klára
Cím:	Unexpected dependence of the protonation constant of 2,2'-bipyridyl on ionic strength / Klára Szabó ; István Nagypál ; István Fábián
Dátum:	1983
ISSN:	0039-9140 1873-3573
Megjegyzések:	he protonation constants of 2,2'-bipyridyl and ammonia have been determined by pH titration at 25", at ionic strengths of 0. I, 0.2, 0.5, 1.0, 1.5 and 2.OM obtained by using LiNO,, NaNO,, KNO,, LiCIO, and NaCIQ as background electrolytes. The protonation constants generally change by about 0.3-0.4 log unrts for both ligands in nitrate media. A similar change in the protonation constant of ammonia was observed in perchlorate media. There is, however, a change of about 0.8-0.9 log units in the protonation constant of bipyridyl in the perchlorate media. This phenomenon is interpreted by postulating ion-pair formation between perchlorate and the protonated form of bipyridyl, HBp+ + ClO;eHBp+ . CIG~ with formation constants of 0.54 in 2M lithium nitrate and 0.45 in 2M sodium mtrate.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Talanta. - 30 : 10 (1983), p. 801-804. -
További szerzők:	Nagypál István (1944-) (kémikus) Fábián István (1956-) (vegyész)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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