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Wyświetlanie 1-15 z 69
Tytuł:
Nanoadsorbents for the preconcentration of some toxic substances : a minireview
Autorzy:
Kaur, A.
Saini, S. S.
Powiązania:
https://bibliotekanauki.pl/articles/411821.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Solid phase extraction
preconcentration
trace analytes
Opis:
The development of new sorbents and their application in preconcentration methods for determination of trace analytes is subject of great interest. Sample pretreatment methods, such as separation / preconcentration prior to the determination of metal ions have developed rapidly due to the increasing need for accurate and precise measurements at extremely low levels of ions in diverse matrices. This review summarizes and discusses several analytical methods involving the preparation and use of new solid phase extractant. A literature survey of the last ten years offering a critical review of these new sorbents available for use in trace analyte enrichment is provided.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 2; 22-35
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of Headspace Solid Phase Microextraction Procedure for Trace Analysis of Toluene
Autorzy:
Heidari, H. R.
Shahtaheri, S. J.
Golbabaei, F.
Alimohammadi, M.
Rahimi-Froushani, A.
Powiązania:
https://bibliotekanauki.pl/articles/90998.pdf
Data publikacji:
2008
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
headspace
solid phase microextraction
gas chromatography
toluene
Opis:
This study describes optimization of headspace solid phase microextraction followed by gas chromatography equipped with a flame ionization detector for toluene at trace level in spiked urine. The parameters affecting the extraction and gas chromatographic determination of analytes were studied: extraction time and temperature; desorption time and temperature; addition of NaCl; and pH, volume and agitation of the sample. Optimized headspace extraction was carried out at 30 °C for 6 min in the presence of 0.2 g⋅m–1of NaCl in the sample solution. Also, sample volume and sample pH were optimized at 5 ml and 7 (neutral pH), respectively. Desorption of the analytes was carried out at 250 °C for 60 s. The optimized procedure was validated with 3 different pools of spiked urine; it showed good reproducibility over 6 consecutive days and 6 within-day experiments. The study also determined the accuracy, linearity and detection limits of this method.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2008, 14, 4; 395-405
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
STABILITY STUDIES OF CEFTIOFUR SODIUM IN AQUEOUS SOLUTIONS AND IN THE SOLID PHASE
Autorzy:
Dołhań, Agnieszka
Sobczak, Agnieszka
Muszalska, Izabela
Medenecka, Beata
Garbacki, Piotr
Tomczak, Szymon
Jelińska, Anna
Powiązania:
https://bibliotekanauki.pl/articles/895368.pdf
Data publikacji:
2018-12-31
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
stability
kinetic parameters
thermodynamic parameters
solid phase
Opis:
Ceftiofur sodium (CFT), a third-generation cephalosporin for parenteral use, is commonly used in veterinary medicine against aerobic Gram-positive and Gram-negative bacteria as well as certain anaerobes. Its broad spectrum of activity and resistance to beta-lactamases result from the presence of methoxyimino and aminothiazole moieties at C-7 in the cephalosporin structure. The aim of this study was a comprehensive evaluation of the stability of CFT in the solid phase and in aqueous solutions. A fast and sensitive HPLC isocratic method was used for the determination of CFT degradation in the solid phase and in aqueous solutions. CFT degradation occurred according to a first-order reaction depending on the substrate concentration. The kinetic and thermodynamic parameters of CFT degradation in the solid phase were calculated. General acid-base hydrolysis of CFT was not observed in the solutions of hydrochloric acid, sodium hydroxide, phosphate (pH 5.84 – 7.25), acetate (pH 3.65 – 5.48) and borate (pH 7.49 – 10.07) buffers. CFT was the most stable in the pH range 2 – 6. The susceptibility of CFT to degradation under the influence of stress factors (pH, temperature, buffer components concentration, relative air humidity) should be considered in terms of storage conditions and the preparation of the product for administration.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2018, 75, 6; 1279-1286
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rapid, sensitive and accurate method for determination of Lafutidine hydrochloride in human plasma by RP-HPLC system
Autorzy:
Vekariya, P. P.
Joshi, H. S.
Powiązania:
https://bibliotekanauki.pl/articles/412425.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
HPLC-PDA
Human plasma
Solid phase Extraction
Opis:
Simple and rapid reverse phase high-performance liquid chromatography (RP-HPLC) method was developed and validated using Phenomenex Gemini c18 (4.6 x 250 mm, 5 μ) reverse phase column for the determination of LAF in human plasma, Solid Phase Extraction (SPE) technique was used for the extraction of analyte, detection was carried out by Photo Diode Array detector at 216 nm. Chromatographic resolution of the LAF was achieved within 4.6 min by using mobile phase Methanol and 5 mM Di-Potassium Hydrogen Phosphate Buffer (pH 9.5) (80:20, v/v), flow rate was 1.0 mL/min. Calibration curve was linear with correlation coefficient of 0.9996 in the range of 50-1000 ng/mL, Limit of Detection (LOD) and Limit of Quantitation (LOQ) were 10 ng/mL and 30 ng/mL respectively, intra and inter-day deviations were lower than 3.92 % and 3.98 % respectively. The overall mean recovery of LAF was 94.57 %. No any endogenous constituents were found to interfere at retention time of the analyte. This new RP-HPLC method was successfully validated and may be applied to conduct bioavailability & bioequivalence studies of LAF.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 7; 9-20
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of Temperatures of Phase Transformations of Low-Alloyed Reinforcing Steel Within the Heat Treatment Temperature Range
Autorzy:
Kargul, T.
Powiązania:
https://bibliotekanauki.pl/articles/351831.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermal analysis
DSC
solid phase transformation
hypoeutectoid steel
Opis:
The paper presents the results of DSC analysis of steel B500SP produced in the process of continuous casting, which is intended for the production reinforcement rods with high ductility. Studies were carried out in the temperature range below 1000°C in a protective atmosphere of helium during samples heating program. The main objective of the study was to determine the temperature range of austenite structure formation during heating. As a result of performed experiments: Ac1s, Ac1f – temperatures of the beginning and finish of the eutectoid transformation, Ac2 – Curie temperature of the ferrite magnetic transformation and the temperature Ac3 of transformation of proeutectoid ferrite into austenite were elaborated. Experimental determination of phase transformations temperatures of steel B500SP has great importance for production technology of reinforcement rods, because good mechanical properties of rods are formed by the special thermal treatment in Tempcore process.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 891-897
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Volatile profiles of toxigenic and non-toxigenic Aspergillus flavus using SPME for solid phase extraction
Autorzy:
De, Lucca A J
Boue, S.M.
Carter-Wientjes, C.H.
Bland, J.M.
Bhatnagar, D.
Cleveland, T.E.
Powiązania:
https://bibliotekanauki.pl/articles/50286.pdf
Data publikacji:
2010
Wydawca:
Instytut Medycyny Wsi
Tematy:
Aspergillus flavus
toxigenic strain
non-toxigenic strain
secondary metabolite
aflatoxin
maize
volatile profile
solid-phase microextraction
solid-phase extraction
potato
isolate
Źródło:
Annals of Agricultural and Environmental Medicine; 2010, 17, 2; 301-308
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of benzene, toluene, ethylbenzene and xylene in field and laboratory by means of cold fiber SPME equipped with thermoelectric cooler and GC/FID method
Autorzy:
Tajik, L.
Bahrami, A.
Ghiasvand, A.
Shahna, F. G.
Powiązania:
https://bibliotekanauki.pl/articles/779634.pdf
Data publikacji:
2017
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
aromatic hydrocarbons
air sampling
cold fiber
solid-phase microextraction
Opis:
A simple and effective cooling device based on a thermoelectric cooler was applied to cool the SPME fiber. The device was used for quantitative extraction of aromatic hydrocarbons in the air. Several factors such as coating temperature, extraction temperature and relative humidity in the laboratory setting were optimized. Comparison of the results between the cold fiber SPME (CF-SPME) and NIOSH 1501 method on standard test atmosphere indicated a satisfactory agreement. The CF-SPME and SPME method were also compared. The results revealed that CF-SPME has the most appropriate outcome for the extraction of aromatic hydrocarbons from the ambient air. The cold fiber SPME technique showed good results for several validation parameters. Under the optimized conditions, the limits of detection (LOD) and the limits of quantification (LOQ) ranged from 0.00019 to 0.00033 and 0.0006 to 0.001 ng ml−1 , respectively. The intra-day relative standard deviation (RSD) showed ranging from 4.8 to 10.5%.
Źródło:
Polish Journal of Chemical Technology; 2017, 19, 3; 9-15
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Composition of volatile flavor compounds from mackerel head broth and mackerel bone broth, Scomberomorus commerson (Lacepède, 1800)
Autorzy:
Pratama, Rusky Intan
Lana, Adan Prabhasworo
Rostini, Iis
Rizal, Achmad
Powiązania:
https://bibliotekanauki.pl/articles/1076690.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Broth
Scomberomorus commerson
Solid Phase Microextraction
proximate
volatile flavor compounds
Opis:
Mackerel of Scomberomorus commerson (Lacepède, 1800) is a fish that has thick meat of a distinctive taste and is a favorite of Indonesian people. It is made into various types of processed seafood. The amount of edible flesh of the fish is 65%, meaning that the waste from the fish is 35%, including the head and bones. The purpose of this study was to determine the type and class of volatile compound components that can be drawn from mackerel head and fish bone, by making these into a broth. This study uses an experimental method by testing the composition of volatile flavor compounds and then undertaking proximate testing. The method of extracting volatile flavor compounds that was applied is Solid Phase Microextraction (SPME), while Gas Chromatography / Mass Spectrometry (GC / MS) was harnessed to identify the volatile flavor. Accordingly, 150 compounds were detected in the sample of mackerel head broth, as compared with 133 compounds in mackerel bone broth. The compounds that were detected are hydrocarbons, aldehydes, alcohols, ketones, organic compounds and others. That which has the largest proportion is pentadecane from the hydrocarbon group, with a value of 18,545%. The proximate analysis results showed that mackerel head broth samples had a 96.08% water content, 1.55% ash content, 0.28% fat content and 2.78% protein content, while samples of mackerel bone broth had a 96.69% water content, 1.54% ash content, 0.44% fat content and 1.84% protein content.
Źródło:
World News of Natural Sciences; 2019, 25; 199-219
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of trace quantities of dutasteride in water and wastewater by solid phase extraction and high-performance liquid chromatography
Autorzy:
Wasilewska, A.
Madajczyk, M.
Szymański, A.
Urbaniak, W.
Powiązania:
https://bibliotekanauki.pl/articles/347041.pdf
Data publikacji:
2011
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
dutasteride
emerging pollutants
solid-phase extraction (SPE)
liquid chromatography
HPLC
Opis:
Steroid compounds are a kind of pollutants which are increasingly more frequently found in environmental samples. Due to the ever more increasing level of such pollutants and their biological activity, they are of interest to analysts. Our study involved the development of a simple and fast method for the assay of dutasteride in treated industrial waste water using high-performance liquid chromatography. As the steroid concentration in water is much lower than the limit of detection of the UV detector used, the compound assayed in the test water was pre-concentrated using solid-phase extraction. Our procedure has high accuracy and a precision of 2.6%, and the recovery of the analyte from water is 78.6%. The procedure enables the assay of dutasteride at a level of 2 microg/L in water.
Źródło:
Ars Separatoria Acta; 2011, 8; 39-49
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption efficiency of pentafluorobenzene on ionic liquids-based silicas
Autorzy:
Wang, X.
Lin, L.
Xie, J.
Yan, X.
Xiao, W.
Tian, P.
Powiązania:
https://bibliotekanauki.pl/articles/778559.pdf
Data publikacji:
2018
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
ionic liquids based silica
pentafl uorobenzene
adsorption
solid-phase extraction
Opis:
The adsorption of pentafl uorobenzene on nine ionic liquid-based silicas was investigated using solid phase extraction. The effects of several variables such as the type of ionic liquid groups, adsorption time, temperatures and water ratio in the solution system were experimentally evaluated. The imidazole-chloride ionic liquid group based silica exhibited the highest adsorption efficiency under the optimized conditions of 5 min adsorption at 30°C in water/methanol (30:70, vol%) solution. In addition, the effects of pH, as well as type and concentrations of chloride salts were investigated. At pH values other than neutral and high salt concentration, the adsorption efficiency was reduced. Finally, the relative standard deviation of less than 5.8% over a 5-day period showed a high precision for the nine tested sorbents.
Źródło:
Polish Journal of Chemical Technology; 2018, 20, 3; 47-52
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical modification of silica surface by bonding ketoimine groups for SPE
Autorzy:
Rykowska, I.
Wasik, W.
Powiązania:
https://bibliotekanauki.pl/articles/346937.pdf
Data publikacji:
2008
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
chemically bonded phases
silica gel
solid-phase extraction (SPE)
gas chromatography
Opis:
The applicability of silica gels, modified with ketoimine groups, in solid-phase extraction was tested. The surface characteristics of the modified silica was determined by elemental analysis, NMR spectra for the solid phases (29Si CP MAS NMR), analysis of pore size distribution of the silica support, and nitrogen adsorptiondesorption. The newly proposed sorbents with ketoimine groups were used for extraction of endocrine-disruptor compounds, extracted from water and powder milk. The properties of the sorbents were compared with commercial C18 ones.
Źródło:
Ars Separatoria Acta; 2008, 6; 41-52
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sample Preparation Followed by High Performance Liquid Chromatographic (HPLC) Analysis for Monitoring Muconic Acid as a Biomarker of Occupational Exposure to Benzene
Autorzy:
Shahtaheri, S. J.
Ghamari, F.
Golbabaei, F.
Rahimi-Froushani, A.
Abdollahi, M.
Powiązania:
https://bibliotekanauki.pl/articles/91059.pdf
Data publikacji:
2005
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
benzene
muconic acid
sample preparation
solid-phase extraction
biological monitoring
chromatography
Opis:
Factors affecting solid phase extraction (SPE) of trans,trans-muconic acid (ttMA), as a benzene biomarker, including sample pH, sample concentration, sample volume, sample flow rate, washing solvent, elution solvent, and type of sorbent were evaluated. Extracted samples were determined by HPLC-UV (high performance liquid chromatography-ultraviolet). The analytical column was C18, UV wave length was 259 nm, and the mobile phase was H2O/methanol/acetic acid run at flow rate of 1 ml/min. A strong anion exchange silica cartridge was found successful in simplifying SPE. There was a significant difference between recoveries of ttMA when different factors were used (p < .001). An optimum recovery was obtained when sample pH was adjusted at 7. There was no significant difference when different sample concentrations were used (p > .05). The optimized method was then validated with 3 different pools of samples showing good reproducibility over 6 consecutive days and 6 within-day experiments.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2005, 11, 4; 377-388
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ecological Monitoring of the Content of Heavy Metal Ions in the Aquatic Environment
Autorzy:
Chernykh, Elena G.
Powiązania:
https://bibliotekanauki.pl/articles/2173344.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
environmental monitoring
water body
solid-phase spectrophotometry
heavy metals
sorption
test method
Opis:
Solid-phase spectrophotometry is one of the effective methods for detecting heavy metals in water. Environmental monitoring of the content of heavy metal ions in the aquatic environment is an urgent task for controlling the quality of wastewater from enterprises, as well as studying their impact on natural water bodies. In this study, an rapid and easy-to-use method for the determination of a number of heavy metals by solid-phase spectrophotometry was developed.
Źródło:
Journal of Ecological Engineering; 2022, 23, 8; 270--276
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adhesive properties of carcinoembryonic antigen glycoforms expressed in glycosylation-deficient Chinese hamster ovary cell lines.
Autorzy:
Krop-Watorek, Anna
Klopocki, Arkadiusz
Czerwinski, Marcin
Lisowska, Elwira
Powiązania:
https://bibliotekanauki.pl/articles/1043841.pdf
Data publikacji:
2002
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
solid-phase cell adhesion assay
N-glycoforms
carcinoembryonic antigen
glycosylation defective mutants
Opis:
Carcinoembryonic antigen (CEA) is an oncofoetal cell surface glycoprotein that serves as an important tumour marker for colorectal and some other carcinomas. Its immunoglobulin-like structure places CEA within the immunoglobulin superfamily. CEA functions in several biological roles including homotypic and heterotypic (with other CEA family members) cell adhesion. Cell-cell interaction can be modulated by different factors, e.g., post-translational modifications such as glycosylation. The purpose of this study was to examine whether changes in carbohydrate composition of CEA oligosaccharides can influence homotypic (CEA-CEA) interactions. In order to modulate glycosylation of CEA we used two different glycosylation mutants of Chinese hamster ovary (CHO) cells, Lec2 and Lec8. Lec2 cells should produce CEA with nonsialylated N-glycans, while Lec8 cells should yield more truncated sugar structures than Lec2. Parental CHO (Pro5) cells and the glycosylation deficient mutants were stably transfected with CEA cDNA. All three CEA glycoforms, tested in a solid-phase cell adhesion assay, showed an ability to mediate CEA-dependent cell adhesion, and no qualitative differences in the adhesion between the glycoforms were observed. Thus, it may be assumed that carbohydrates do not play a role in homotypic adhesion, and the interactions between CEA molecules depend solely on the polypeptide structure.
Źródło:
Acta Biochimica Polonica; 2002, 49, 1; 273-283
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of di-n-butyl Phthalate in Environmental Samples
Autorzy:
Ziembowicz, Sabina
Kida, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/27315758.pdf
Data publikacji:
2023
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
di-n-butyl phthalate
aqueous samples
landfill leachate
solid phase extraction
method validation
Opis:
A devised methodology presented here allows the determination of di-n-butyl phthalate in environmental samples (water and landfill leachate) using solid-phase extraction (SPE) and gas chromatography. It is developed based on the use of a gas chromatograph with an FID detector. Preliminary testing has also provided extraction parameters and conditions for chromatographic determination, with calibration applied by reference to an internal standard. The linearity of the calibration curve has been tested in DBP concentrations ranging from 0 to 7.5 mg/L, with the data obtained showing that, throughout this range, the detector readings as a function of the DBP concentrations remain linear (R2 coefficient >0.99). The average levels of recovery of DBP from aqueous solutions of phthalates are in the range of 97-109%, while the corresponding figures for leachates are 85-101%. The values of the coefficients of variation associated with the results obtained do not exceed 5%. The results, therefore, indicate that the applied extraction method is effective as regards DBP extraction from both water and landfill leachate, while numerous other substances present in the leachate from landfill sites apparently do not affect the correct determination of di-n-butyl phthalate by the method developed.
Źródło:
Rocznik Ochrona Środowiska; 2023, 25; 242--249
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 69

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