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A simultaneous laser-induced fluorescence (LIF), coaxial thermal lens spectroscopy (TLS) and retro-reflected beam interference (RBI) detection for capillary electrophoresis (CE), has been described. In its optical scheme, a diode-pump solid-state (DPSS) laser was employed as the pump laser in both LIF detection and coaxial TLS detection, and a He–Ne laser was utilized as the probe laser in coaxial...
Undoubtedly, FTIR-spectrophotometry has become a standard in chemical industry for monitoring, on-the-fly, the different concentrations of reagents and by-products. However, representing chemical samples by FTIR spectra, which spectra are characterized by hundreds if not thousands of variables, conveys their own set of particular challenges because they necessitate to be analyzed in a high-dimensional...
The feasibility of using Fourier Transform Mid-Infrared Spectroscopy (FT-MIR) combined with Partial Least Squares Regression (PLS-R) for the determination of 12 anthocyanins (3-O-glucosides of delphinidin, cyanidin, petunidin, peonidin and malvidin, as well as acetic acid esters and p-coumaric acid esters of petunidin, peonidin and malvidin and caffeic acid ester of malvidin) and three sums (sum of...
The non-traditional stable strontium (Sr) isotopes have received increasing attention recently as new geochemical tracers for studying Sr isotopic fractionation and source identification. This has been attributed to the advancement in multiple-collector inductively coupled plasma mass spectrometry (MC-ICP-MS), allows to determine precisely and simultaneously of the triple Sr isotopes. In this study,...
A simple controlled chemical reduction of 1,3,5-trinitro-1,3,5-triazacyclohexane (RDX) and related nitramine compounds with zinc amalgam generates species that elicit intense chemiluminescence with tris(2,2′-bipyridine)ruthenium(III), which extends this widely utilised chemiluminescence reagent to a new class of analyte and presents a sound chemical basis for a screening test for nitramine high explosives...
Four different generation of thiol-DAB dendrimers were synthesized, S-DAB-G x (x=1, 2, 3 and 5), and coupled with CdSe quantum dots, to obtain fluorescent nanocomposites as metal ions sensing. Cd(II) and Pb(II) showed the higher enhancement and quenching effects respectively towards the fluorescence of S-DAB-G 5 -CdSe nanocomposite. The fluorescence enhancement provoked by Cd(II) can...
The degradation process of edible oils of different nature, submitted to heating at 170°C, 190°C and 210°C with aeration, was studied by means of 1 H nuclear magnetic resonance spectroscopy (NMR). In this study, secondary products such as aldehydes were detected and monitored over time. Two complementary analytical approaches were adopted to characterize the kinetics of the appearance of aldehydes...
A capillary electrophoresis (CE) method with ultraviolet detection has been developed for simultaneous detection and quantification of five nitroimidazoles including benzoylmetronidazole, dimetridazole, metronidazole, ronidazole, and secnidazole in porcine muscles. Nitroimidazoles in samples were extracted by ethyl acetate with subsequent clean-up by a strong cation exchange solid phase extraction...
The species and concentrations of porphyrins in erythrocytes are of great importance in the clinical screening and diagnosis of porphyrias. However, it is difficult to analyze them simultaneously by conventional spectrofluorimetry. In this paper, we proposed a novel, simple and rapid method for the simultaneous determination of three diagnostically important porphyrins in human erythrocytes, protoporphyrin...
Selective, rapid and accurate quantitative proton nuclear magnetic resonance (qHNMR) method for the determination of levofloxacin, metronidazole benzoate and sulfamethoxazole in aqueous solutions was developed and validated. The method was successfully applied to the determinations of the drugs and their admixtures in pharmaceutical, urine and plasma samples. Maleic acid and sodium malate were used...
The quartz crystal microbalance (QCM) dynamic measurements indicate that ginsenoside Rh 2 (G-Rh 2 ) could inhibit the proliferation of adriamycin-resistant human breast cancer MCF-7 cells (MCF-7/ADR) in a concentration-dependent way. The combined treatment of G-Rh 2 with adriamycin (ADR) at non-effect dosage resulted in the higher inhibition efficiencies and the increased cell-death...
Analysis of integral membrane proteins (IMPs) presents great challenges due to their hydrophobic nature. Recently, much attention has been paid to improve the solubilization of IMPs. However, besides that, the separation of hydrophobic peptides with high recovery is also a dominating factor, but with rare report. Here, the prefractionation of the digests by reverse phase trap column during desalting...
Stroke is a leading cause of death and disability, affecting millions of people worldwide with almost 80% of them as ischemic stroke and understanding the multiple mechanisms underlying cerebral ischemia is essential for development of effective treatments. To understand metabolic changes induced by focal brain ischemia, we conducted a comparative analysis of metabolic composition of cerebral tissue...
A method for analysis of 15 PAHs in charcoal-grilled meat/fish was established by high performance liquid chromatography and fluorescence detection. Gradient elution was performed with methanol/water/ethyl acetate. Maxima excitation and emission wavelengths were selected for each PAH. Retention times were very stable with coefficients of variation below 0.24% within analytical day and below 0.60%...
A selective and simple analytical method for the trace level determination of carbofuran in complex environmental and biological samples was developed based on immunoaffinity extraction (IAE) followed by on-line preconcentration and HPLC/UV analysis of the purified extract. The immunosorbent for IAE was prepared by sol–gel encapsulation of monoclonal anti-carbofuran antibodies, and was fully characterized...
A carbon paste electrode modified with tin was used for the determination of trace cadmium by anodic stripping voltammetry. The electroanalytical performance for the determination of Cd(II) on the tin-coated carbon paste electrode(SnF-CPE) was better than that on the carbon paste electrode. The measuring conditions have been optimized. The measurement of trace cadmium on the SnF-CPE has the best response...
Capillary electrophoresis can provide fast and efficient separations of peptides. However, the high speed separation and limited loading capacity of capillary electrophoresis requires the use of a fast and sensitive detector. While laser-induced fluorescence provides exquisite sensitivity and millisecond response time, it inherently generates a low information content signal. In contrast, mass spectrometry...
A simple and fast method for trace speciation analysis of mercury (Hg 2+ ), methylmercury (MeHg + ) and ethylmercury (EtHg + ) in seawater has been developed by short-column high-performance liquid chromatography hyphenated to inductively coupled plasma spectrometry (HPLC–ICP-MS) after on-line cation-exchange column (CEC) preconcentration. The analytes were firstly adsorbed...
A sensitive electrochemical sensor for nitrobenzene (NB) detection has been developed based on macro-/meso-porous carbon materials (MMPCMs). MMPCMs were prepared by pyrolysis of the ionic-liquid ([AEIm]BF 4 ) polymer (PIL) pre-wrapped onto SiO 2 microspheres and then removal of the silica core. The morphology and structure of MMPCMs were characterized by scanning electron microscopy...
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