Number of found documents: 286
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Surface modification of nanoparticles for sustaining sensitivity of surface-enhanced raman spectrometric measurements in salinated environment
Týčová, Anna; Přikryl, Jan; Vaňhara, P.; Klepárník, Karel; Foret, František
2020 - English
Surface-enhanced Raman spectrometry (SERS) represents a powerful method for analysis of a broad spectrum of analytes ranging from inorganic ions to biomolecules of high complexity. It combines the potential\nof Raman spectrometry for a definite identification of an analyte with remarkable sensitivity achieved by the surface enhancement effect occurring on metal nanoparticles. While low ionic strength influences positively\nthe sensitivity of the SERS measurement, a higher level of inorganic salts leads to fast ruining of colloidal character, which completely devastates the effect of the surface enhancement. The common stabilization of\nnanoparticles by a layer of polymers has a negative impact on the SERS sensitivity since it shields the nanoparticle surface from the analytes. In this work, we aim at the development of the bi-ligand system of\nnanoparticles surface modification for improved stability of colloid in saline solution at sustaining the potential for sensitive SERS analyses. The proposed system relies on the binding of 3-mercaptopropionic acid and\nthiolated polyethylene glycol in a suitable ratio onto the nanoparticle surfaces. While the short chains of the acid sustain the accessibility of the surface for analytes, the polymeric structures act as a steric barrier\npreventing colloid aggregation. Keywords: bi-ligand; nanoparticle; saline solution; surface-enhanced Raman spectrometry Available at various institutes of the ASCR
Surface modification of nanoparticles for sustaining sensitivity of surface-enhanced raman spectrometric measurements in salinated environment

Surface-enhanced Raman spectrometry (SERS) represents a powerful method for analysis of a broad spectrum of analytes ranging from inorganic ions to biomolecules of high complexity. It combines the ...

Týčová, Anna; Přikryl, Jan; Vaňhara, P.; Klepárník, Karel; Foret, František
Ústav analytické chemie, 2020

Effect of metal sensitizers on photochemical vapor generation of bismuth for analytical atomic spectrometry
Vyhnanovský, Jaromír; Yildiz, D.; Musil, Stanislav
2019 - English
Three new sensitizers with a significant positive effect on the photochemical vapor generation of bismuth were described. Cobalt was found to be the most effective and led to a significant enhancement of the signal. Keywords: photochemical volatile species generation; bismuth; AAS Available at various institutes of the ASCR
Effect of metal sensitizers on photochemical vapor generation of bismuth for analytical atomic spectrometry

Three new sensitizers with a significant positive effect on the photochemical vapor generation of bismuth were described. Cobalt was found to be the most effective and led to a significant enhancement ...

Vyhnanovský, Jaromír; Yildiz, D.; Musil, Stanislav
Ústav analytické chemie, 2019

Generování hydridů ve spojení s hmotnostní spektrometrií s indukčně vázaným plazmatem
Matoušek, Tomáš
2019 - Czech
Přehledný text popisující využití techniky generování těkavých hydridů v hmotnostní spektrometrií s indukčně vázaným plazmatem včetně speciačních analýz. An overview describing technique of volatile hydride generation in connection with inductively coupled plasma mass spectrometry including speciation analysis. Keywords: hydride generation; ICP-MS; speciation analysis Available at various institutes of the ASCR
Generování hydridů ve spojení s hmotnostní spektrometrií s indukčně vázaným plazmatem

Přehledný text popisující využití techniky generování těkavých hydridů v hmotnostní spektrometrií s indukčně vázaným plazmatem včetně speciačních analýz....

Matoušek, Tomáš
Ústav analytické chemie, 2019

Metals in atmospheric particulate matter
Barboříková, H.; Mikuška, Pavel; Hegrová, J.; Pokorná, Petra; Krajčovič, J.
2019 - English
Atmospheric pollution is one of the most serious global enviroment problem. Metals constitute important class of pollutants which have received athe attention of researchers all over the world. Metals have strong potential to be adsorbed on particulate matter and than enter the human body through inhalation causing several health issue (asthma, lung cancer). Keywords: aerosol; metals Available at various institutes of the ASCR
Metals in atmospheric particulate matter

Atmospheric pollution is one of the most serious global enviroment problem. Metals constitute important class of pollutants which have received athe attention of researchers all over the world. Metals ...

Barboříková, H.; Mikuška, Pavel; Hegrová, J.; Pokorná, Petra; Krajčovič, J.
Ústav analytické chemie, 2019

Atomization of bismuthane in two flame atomizers for atomic fluorescence spectrometry
Štádlerová, Barbora; Kolrosová, Marta; Dědina, Jiří; Musil, Stanislav
2019 - English
Atomization of bismuthane in the minature diffusion flame and the flame-in-gas-shield atomizer by hydride generation coupled with atomic fluorescence spectrometry. Keywords: atomic fluorescence spectrometry; bismuth; hydride generation Available at various institutes of the ASCR
Atomization of bismuthane in two flame atomizers for atomic fluorescence spectrometry

Atomization of bismuthane in the minature diffusion flame and the flame-in-gas-shield atomizer by hydride generation coupled with atomic fluorescence spectrometry.

Štádlerová, Barbora; Kolrosová, Marta; Dědina, Jiří; Musil, Stanislav
Ústav analytické chemie, 2019

Quick determination of compounds contained in caraway (Carum carvi L.) by a method usable in agricultural practice
Horáčková, L.; Pluháčková, H.; Bradáčová, M.; Kudláčková, Barbora
2019 - English
Caraway is a very important agricultural commodity whose quality is determined by parameters such as dry matter, essential oil content and composition, especially the ratio of its two major components carvone and limonene. Appropriate method for their analysis is given in the Cesky lekopis (2017), however, this method is rather time-consuming, costly and demands large quantity of sample. The use of a NIR spectrometer could be a viable alternative, it is much faster and cheaper, as can be clearly seen from the comparison of both methods in this paper. In the time aspect, it's saving from many hours to a few minutes. Newly presented method could potentially be more accessible to agricultural companies who need quick quality verification of their product before taking it to the market from the viewpoint of final product quality not just the quantity, which, in most cases, is nowadays a current state of practice. Keywords: caraway; essential oil; carvone; limonene Available at various institutes of the ASCR
Quick determination of compounds contained in caraway (Carum carvi L.) by a method usable in agricultural practice

Caraway is a very important agricultural commodity whose quality is determined by parameters such as dry matter, essential oil content and composition, especially the ratio of its two major components ...

Horáčková, L.; Pluháčková, H.; Bradáčová, M.; Kudláčková, Barbora
Ústav analytické chemie, 2019

Optimization of photochemical vapor generation of molybdenum as a sample introduction for ICP-MS
Šoukal, Jakub; Musil, Stanislav
2018 - English
Conditions of photochemical vapor generation of molybdenum with ICP-MS detection have been in detail investigated. Keywords: ICP-MS; molybdenum; photochemical vapor generation Available at various institutes of the ASCR
Optimization of photochemical vapor generation of molybdenum as a sample introduction for ICP-MS

Conditions of photochemical vapor generation of molybdenum with ICP-MS detection have been in detail investigated.

Šoukal, Jakub; Musil, Stanislav
Ústav analytické chemie, 2018

Složení prachových částic v emisích ze spalování uhlí v různých typech kotlů používaných pro vytápění domácností
Křůmal, Kamil; Mikuška, Pavel; Horák, J.; Hopan, F.
2018 - Czech
Organické sloučeniny (polycyklické aromatické uhlovodíky, alkany) a organické markery (hopany) používané pro identifikaci emisních zdrojů aerosolů byly měřeny v emisích ze spalování černého a hnědého uhlí. Uhlí bylo spalováno v různých typech kotlů (prohořívací, odhořívací, automatický kotel) používaných pro vytápění domácností v České republice. Organic compounds (polycyclic aromatic hydrocarbons, alkanes) and organic markers (hopanes) used for the identification of aerosol emission sources were measured in emissions from the combustion of hard and brown coal. Coal was combusted in different boilers (overfire boiler, boiler with down-draft combustion and automatic boiler) used for residential heating in the Czech Republic. Keywords: residential heating; household heating; coal combustion Available at various institutes of the ASCR
Složení prachových částic v emisích ze spalování uhlí v různých typech kotlů používaných pro vytápění domácností

Organické sloučeniny (polycyklické aromatické uhlovodíky, alkany) a organické markery (hopany) používané pro identifikaci emisních zdrojů aerosolů byly měřeny v emisích ze spalování černého a hnědého ...

Křůmal, Kamil; Mikuška, Pavel; Horák, J.; Hopan, F.
Ústav analytické chemie, 2018

Photon-upconverting nanoparticles as a novel background-free label in immunoassays
Farka, Z.; Hlaváček, Antonín; Mickert, M. J.; Skládal, P.; Gorris, H. H.
2018 - English
Photon-upconverting nanoparticles (UCNPs) have become an attractive label in immunoassays because their anti-Stokes luminescence can be excited by the NIR laser and detected in the VIS region without optical background interference. Further advantages of UCNPs include good photostability, large anti-Stokes shifts, and multiple narrow emission bands that can be used for multiplexed detection. We have developed a competitive upconversion-linked immunosorbent assay (ULISA) for detection of the pharmaceutical diclofenac (DCF) in surface waters. Silica-coated UCNPs (50 nm in diameter) with carboxyl groups on the surface were synthesized and conjugated with the secondary anti-IgG antibody. The structure and monodispersity of the nanoconjugates was studied by TEM and agarose gel electrophoresis. Using a highly affine anti-DCF primary antibody, the optimized ULISA provided a detection limit of 50 pg·mL−1. Keywords: photon-upconversion nanoparticle; immunoassay; bioconjugation; antibody; diclofenac Available at various institutes of the ASCR
Photon-upconverting nanoparticles as a novel background-free label in immunoassays

Photon-upconverting nanoparticles (UCNPs) have become an attractive label in immunoassays because their anti-Stokes luminescence can be excited by the NIR laser and detected in the VIS region without ...

Farka, Z.; Hlaváček, Antonín; Mickert, M. J.; Skládal, P.; Gorris, H. H.
Ústav analytické chemie, 2018

Determination of permeability of ulra-fine lead oxide aerosols through military filters
Kellnerova, E.; Večeřa, Zbyněk; Kellner, J.; Zeman, T.; Hylak, Č.
2018 - English
Military filters introduced in the Army of the Czech Republic are most commonly used when working with combat equipment and weapons and in manoeuvring activities in the terrain with the use of explosives or chemical warfare agents. During such activities, a large number of pollutants in the form of nanoparticles are released. Nanoparticles, irrespective of their chemical composition, are classified as carcinogenic to humans and therefore it is necessary to eliminate them from the air. Military filters, especially the combined ones, which contain a filtration as well as sorption component, are most widely used and are designed for the widest range of pollutants. However, the current methodology to evaluate the effectiveness of military filters does not fix a duty to monitor the ability of the filters to capture relevant pollutants across the whole range of sizes. The paper evaluates the efficiency of selected types of military filters using the methodology and instrumentation introduced in the accredited laboratories of the Institute of Analytical Chemistry of the Academy of Sciences of the Czech Republic. The testing has been carried out simultaneously with two concentrations of ultra-fine aerosols containing lead oxide nanoparticles ranging in size from 7.6 nm to 299.6 nm. It is an aerosol, the physicochemical and toxicological properties of which are known. During the work the basic parameters of permeability of aerosols tested by filters have been evaluated, especially: size and number of particles in front of and behind the filter, the efficiency and penetration of nanoparticles by the filter. Keywords: nanoparticle; filter; efficiency; health safety Available at various institutes of the ASCR
Determination of permeability of ulra-fine lead oxide aerosols through military filters

Military filters introduced in the Army of the Czech Republic are most commonly used when working with combat equipment and weapons and in manoeuvring activities in the terrain with the use of ...

Kellnerova, E.; Večeřa, Zbyněk; Kellner, J.; Zeman, T.; Hylak, Č.
Ústav analytické chemie, 2018

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