Review of recent developments in quantitative analysis and microchemical imaging plants by LIBS XRF.

Dithiocarbamates are nitrogen- and sulfur-containing compounds commonly used in pharmacology, medicine agriculture. The molecular effects of dithiocarbamates on neuronal cell systems not fully understood, especially terms their ability to accumulate copper ions inside the cell. In this work, N,N-diethyldithiocarbamate (DEDTC) were studied human SH-SY5Y neuroblastoma cells determine role DEDTC toxicity pathway trigged by complex Cu-DEDTC. From concentration-dependent studies, we found that 5...

Laser-induced breakdown spectroscopy (LIBS) is a multi-elemental technique with multiple advantages. However, direct determination in liquid samples not an easy task since laser water interaction can affect the precision and accuracy of method cause loss sensitivity. To enable LIBS application sample analysis, some strategies such as liquid-to-solid transfer have been used. This work proposes quantification chromium by using ceramic solid support. Results showed that selectively adsorbs...

The presence of the bicarbonate/carbon dioxide pair is known to accelerate transition metal ion-catalysed oxidation various biotargets. It has been shown that stable Cu(II) complexes formed with imine ligands allow redox cycling between Cu(I) and display diverse apoptotic effects on cell cultures. also reported Cu(II)–tetraglycine can form a Cu(III) complex. In present study, radical generation from H2O2 H2O2/HCO3− in these two different classes was evaluated by monitoring dihydrorhodamine...

Iron overload causes progressive and sometimes irreversible damage due to accelerated production of reactive oxygen species. Desferrioxamine (DFO), a siderophore, has been used clinically remove excess iron. However, the applications DFO are limited because its inability access intracellular labile Cell penetrating peptides (CPPs) have become an efficient delivery vector for enhanced internalization drugs into cytosol. We describe, herein, method covalently conjugating CPPs TAT(47–57)...

The calibration and quantitative measurement is the " Achilles heel of LIBS technique. This paper deals with a method developed for direct K Mg in plant samples. Instrumental parameters were optimized best condition found was 50 μm spot size, 10 Hz laser repetition rate, 75 accumulated pulses 25 mJ/pulse 0.25 μs delay time. For calibration, use synthetic standard calibrating material prepared by addition increasing concentrations wood, filter babassu mesocarp proposed order to assess...

Calibration aiming at quantitative analysis of complex samples is one the most difficult issues in laser-induced breakdown spectroscopy (LIBS) due to matrix interferences, heterogeneity, and sample particle size effects.

This paper presents two complementary methods capable of identifying four wood species ( Cedrela fissilis, Ocotea porosa, Hymenolobium petraeum, and Aspidosperma subincanum ) both by their volatile organic compounds the presence 10 chemical elements: Al, B, Ca, Mg, Zn, Cu, Mn, Fe, Na, Si. The were detected an electronic nose formed array three different conductive polymer gas sensors. elemental determination was made laser-induced breakdown spectrometry (LIBS). emissions measured treated...

The first report of quantitative measurement calcium, magnesium, potassium and sodium in bovine chicken meat by LIBS.

SPECTROMETRY: A REVIEW.This is a review of direct analysis using solid sampling graphite furnace atomic absorption spectrometry.Greater emphasis dedicated to sample preparation, homogeneity, calibration and its application microanalysis micro-homogeneity studies.The main advantages some difficulties related the applicability this technique are discussed.A literature search on spectrometry in trace element determination many kinds samples, including biological, clinical, technological...

Matte photographic paper was explored as a low-cost material for metal-ion retention. The extraction promoted by ultrasound, the mechanical waves of which forced adhesion to surface an ion pair formed DTAB (dodecyltrimethylammonium bromide) with anionic coordination complex metal ions and SPADNS (1,8-dihydroxy-2-(4-sulfophenylazo)naphthalene-3,6-disulfonic acid trisodium salt). As proof concept, migration copper present in aqueous solution solid phase their direct measurement laser-induced...

Cloud point extraction (CPE) was employed for separation and preconcentration prior to the determination of nickel by graphite furnace atomic absorption spectrometry (GFAAS), flame (FAAS) or UV-Vis spectrophotometry. Di-2-pyridyl ketone salicyloylhydrazone (DPKSH) used first time as a complexing agent in CPE. The complex extracted from aqueous phase using Triton X-114 surfactant. Under optimized conditions, limits detection obtained with GFAAS, FAAS spectrophotometry were 0.14, 0.76 1.5 μg...

Simple and rapid analytical procedures for the direct determination of total Hg chemical speciation Hg2+ methylmercury (MHg) in fish were proposed after careful optimization heating program addition appropriate modifiers by solid sampling graphite furnace atomic absorption spectrometry (SS-GF AAS). The was done using Ir film 5 μg Pd + 3 Mg solution as permanent co-injected modifiers, respectively. For speciation, or 0.5% w/v Triton X-100 solutions used modifiers. accuracy both verified...

Abstract Mushrooms are bioaccumulating organisms commonly used in selenium (Se) enrichment studies. However, the addition of Se culture medium may alter distribution other essential elements mushroom fruiting body. To evaluate effects enrichment, Ca, Mg, and K distributions pink oyster ( Pleurotus djamor ) Mg white ostreatus mushrooms were mapped by laser-induced breakdown spectroscopy (LIBS), which can be at room temperature requires minimal or no sample preparation. It was verified that...

This paper describes methods for the direct determination of Cd and Pb in hair segments (c.a. 5 mm, ∼80 μg) by solid sampling graphite furnace atomic absorption spectrometry, becoming possible longitudinal profiles a single strand hair. To distinguish endogenous exogenous content, strands were washed using two different procedures: IAEA protocol (acetone + water acetone) combination with HCl washing acetone 0.1 mol l−1 HCl). The concentration increased from root until tip according to...