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A method was developed for the simultaneous speciation of arsenic and antimony with HPLC–ICP-MS using C30 reversed phase column. Eight kinds of arsenic compounds (As(III), As(V), monomethylarsonic acid (MMAA), dimethylarsinic acid (DMAA), arsenobetaine (AB), arsenocholine (AsC), trimethylarsine oxide (TMAO) and tetramethylarsonium (TeMA)), Sb(III) and Sb(V) were simultaneously separated by the special...
S-Nitrosothiols (RSNO) have been proved to be potent smooth muscle relaxants and inhibitors of platelet aggregation. It has been reported as the best candidate for the endogenous storage and transport of nitric oxide (NO) in vivo. Sensitive determination of RSNO in biosamples seems to be of great significance. In this work, a novel spectrofluorimetric method is proposed to determine RSNO. An excellent...
The retention behaviour of selenites (Se(IV)), selenates (Se(VI)), seleno-dl-methionine (Se-Met), selenocystine (Se-Cyst), selenocystamine (Se-CM) and selenourea (Se-U) was investigated using a Discovery end-capped reversed-phase column as stationary phase and different mobile phase conditions. Extrapolated to 100% aqueous mobile phase retention factors (logk w ) of the investigated Se species,...
For the fast morphine monitoring in flow injection systems a highly sensitive method is being introduced in this work. The fast Fourier transformation with continuous cyclic voltammetry (FFTCV) in a flowing solution as a detection system was applied for the prompt morphine monitoring. Here it should be stressed that this technique is simple, precise, accurate, time saving and economical. This research...
The concentrations of chromium (III) and (VI) in fly ash from nine Australian coal fired power stations were determined. Cr(VI) was completely leached by extraction with 0.01M NaOH solution and the concentration was determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). This was confirmed by determining Cr(III) and Cr(VI) in the extracts of fly ash that had been spiked with...
Preconcentration of heavy metals in water with ammonium pyrrolydine dithiocarbamate (APDC) is a common practice in analytical chemistry. A literature review on this topic showed that several authors use this precipitation agent, but in different preconcentration conditions, conducting to divergent results. The objective of this work is to use factorial design to optimize the factors involved in the...
A rapid and simple method using capillary electrophoresis (CE) with chemiluminescence (CL) detection was developed for the determination of levodopa. This method was based on enhance effect of levodopa on the CL reaction between luminol and potassium hexacyanoferrate(III) (K 3 [Fe(CN) 6 ]) in alkaline aqueous solution. CL detection employed a lab-built reaction flow cell and a photon...
Methanol is the organic solvent closest to water and able to dissolve a huge amount of organic compounds. Therefore, it is a good candidate for pK a determination of drugs sparingly soluble in water or a basic drug presented as a salt which pK a is close to that of its counter-acid. In this work, the acidic dissociation constants in pure methanol of the most common acids used in pharmaceutical...
The main purpose of this study is to develop an inexpensive, simple, selective and especially highly selective modified mixed-oxide carbon paste electrode (CPE) for voltammetric determination of Pb(II). For the preliminary screening purpose, the catalyst was prepared by modification of SiO 2 –Al 2 O 3 mixed-oxide and characterized by TG, CHN elemental analysis and FTIR spectroscopy...
Analytical methodologies employed in biodesulfurization processes have been reviewed; attention is primarily focused on the use of analytical techniques in the identification of degradation products and on the monitoring of degradation processes in which microbial sulphur-specific transformations take place. This is the first review of analytical techniques applied to biodesulfurization processes...
A multi-element preconcentration–separation technique for heavy metal ions in environmental samples has been established. The procedure is based on coprecipitation of gold(III), bismuth(III), cobalt(II), chromium(III), iron(III), manganese(II), nickel(II), lead(II), thorium(IV) and uranium(VI) ions by the aid of Cu(II)–9-phenyl-3-fluorone precipitate. The Cu(II)–9-phenyl-3-fluorone precipitate was...
The pentavalent inorganic arsenic (As) species [As(V)] is found to be 4% more sensitive than the trivalent species [As(III)] with inductively coupled plasma mass spectrometry (ICP-MS) and inductively coupled plasma optical emission spectrometry (ICP-OES). Although there was no sensitivity difference between As(III) and As(V) with atomic absorption spectrometry (AAS), electrothermal atomization atomic...
At present, liposomes play a significant role as drug delivery vehicles being considered very promising for gene therapeutics. The in vivo application of these drug delivery systems widely depends on their physico-chemical and technological characteristics such as the structure, the shape, the size distribution, the surface modification and the drug interaction. To describe the liposomes, different...
Interference effects in CALUX measurements were studied. 2,3,7,8-TCDD and PCB 126 solutions were added, according to an experimental design, to the genetically modified cells. CALUX responses were measured for pure solutions of each of these pollutants, for their mixtures and for successive additions where the first added pollutant is removed after 4h and replaced by medium solution, the same pollutant...
In this paper, we demonstrate an electrochemiluminescence (ECL) enhancement of tris(2,2-bipyridyl)ruthenium(II) (Ru(bpy) 32+ ) by the addition of silver(I) ions. The maximum enhancement factor of about 5 was obtained on a glassy carbon electrode in the absence of co-reactant. The enhancement of ECL intensity was possibly attributed to the unique catalytic activity of Ag + for...
As a novel type of learning machine method a support vector machine (SVM) was first used to develop a quantitative structure–property relationship (QSPR) model for the latest surface tension data of common diversity liquid compounds. Each compound was represented by structural descriptors, which were calculated from the molecular structure by the CODESSA program. The heuristic method (HM) was used...
Two clinical data sets were applied for pattern recognition in order to discover the correlation between urinary nucleoside profiles and tumours. One data set contains 168 clinical urinary samples, of which 84 specimens are from female thyroid cancer patients (malignant tumour group), and the other samples were collected from healthy women (normal group). However, 168 clinical urinary samples comprised...
In this study, we investigate highly efficient sonogel carbon electrode (SGC/TiO 2 ) modified with nanostructured titanium dioxide synthesized via sol–gel method employing surfactant template for tailor-designing the structural properties of TiO 2 . The stable SGC/TiO 2 electrode detects catechol, a neurotransmitter, in the presence of ascorbic acid, a common interferent, using...
A new approach was explored to purify proteins in a multi-step procedure for the characterisation of proteinaceous materials (casein, animal glue, and egg) in artwork samples by gas chromatography–mass spectrometry. High concentrations of inorganic salts, such as azurite, have been found to impair the determination of protein via amino acid analysis. The effect of varying concentrations of copper-based...
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