JBCS

Nickel-catechol complex (Ni-CA) was deposited electrochemically on the surface of a multiwalled carbon nanotube-modified carbon ceramic electrode (MWCNT-CCE) at pH 13. Cyclic voltammetry showed a quasi-reversible behavior for the redox pair of Ni(III)/Ni(II). The modified electrode had electrocatalytic activity in the oxidation of gabapentin (GP).

Oxidation of glycine and alanine by bromine generated in situ by Oxone^®-bromide mixture proceeds through complex formation between bromine and the anion of the amino acid.

Fast and nondestructive ink identification in handwritten questioned documents by visible spectroscopy and chemometric analysis.

Thermal imprinting easy ambient sonic-spray ionization mass spectrometry (TI-EASI-MS) was applied to direct lipid analysis of dry-cured ham. Triacylglycerols, diacylglycerols and free fatty acids were identified, according to the process and the rearing systems of pigs.

Filters were placed in high-volume sampler to capture atmospheric particles for subsequent validation of methodology in order to determine concentrations of metals such as Cd, Cu, Pb, V and others that can cause health problems.

Multivariate optimization of important variables of the QuEChERS method coupled to GC-ECD and investigation of the levels of pesticide residues in fruits and vegetables commercialized in Santa Catarina state, South of Brazil.

Layered divalent metal glycerolates were synthesized, characterized and used as catalyst in the transesterification of refined soybean oil. Almost complete conversions were obtained under mild reaction conditions and calcium diglycerolate preserved the structure up to three cycles of use.

Mercury determination by inductively coupled plasma mass spectrometry using conventional sample introduction systems is affected by significant memory effect. In order to overcome this difficulty, a new sample introduction setup employing a low pressure spray chamber was developed.

Chemical crosslinking. Citric acid attaches to the thermoplastic starch (TPS) chains and bacterial cellulose (BC) nanoribbons through covalent bonds.

Electrocatalytic reaction between electrochemically generated quinoneimines and glutathione and the resulting voltammograms.

This paper describes a method for selective determination of Sn⁺² by voltammetry, using 1 mol L^-1 hydrochloric acid as electrolyte.

A carbon paste electrode chemically modified with multiwall carbon nanotubes was prepared and used as a selective electrochemical sensor for the simultaneous determination of isoproterenol, acetaminophen and folic acid.

A flow-batch system using cadmium telluride quantum dots (CdTe QDs) and webcam for spectrofluorimetric determination of N-acetyl-L-cysteine in pharmaceutical formulations.

Polysaccharide bacterial cellulose (BC) was used as a template for preparation of Hydrotalcite-type compounds or layered double hydroxides (LDHs) by a bio-inspired route. The changes in LDH particles morphology and the improvement in surface area can be driven by the cation-binding on the BC surface. Novel synthetic routes that lead to materials with particular morphology and surface area are interesting to produce catalysts and drug delivery systems.

This article presents a simple method, applied to a complex matrix for quantification of fat-soluble pesticides. The validated method was applied to twenty milk samples collected in small dairy farms in the Municipality of Chapada dos Guimaraes, Mato Grosso, Brazil, a Brazilian understudied region.

Capillary electrophoresis with capacitively coupled contactless conductivity detection for the direct determination of oleic acid content in soybean oil using salicylic acid as internal standard. Under negative polarity, the anionic solutes moved faster than the electro osmotic flow.

Exploring the potential electrochemical determination of markers (methyl phenyl acetate, methyl p-anisate, methyl nicotinate and 2-methoxybiphenyl) proposed to be indicative of Mycobacterium tuberculosis infection.

The GA represents the molecular structure of dipyrone as well as the commercial capsules drug. It is also shown the UV-Vis spectrum of the initial aqueous solution of 50 mg L^-1 of dipyrone and after 90 min of electrochemical treatment, where the maximum absorption occurs at around 1.2 at wavelength 262 nm.

α-solanine and α-chaconine are the two main potato glycoalkaloids, toxic at certain levels, that may be persistent in the terrestrial environment. A new analytical method that uses liquid chromatography Orbitrap mass spectrometry has been developed for the analysis of the two glycoalkaloids and theirs aglycons in potato upper soils.

Regiocontrolled Sonogashira cross-coupling of 1,3,5-tribromobenzene with the terminal (4-alkoxyaryl)acetylenes yielded mono-, di- and tri-alkynylated benzene derivatives in moderate to good yields.

Direct analysis of cocaine hydrochloride in drug samples without any sample preparation by infrared and PLS analysis.

In this study, lipase showed a good activity in the w/o microemulsion system, which served as a host for water-soluble enzymes.

Through the combination of alkaline and acid catalysts, low frequency ultrasound, and response surface methodology, a new fatty acid methylation method with minimal ester oxidation was developed, optimized and validated.

Three surfactant-modified sorbents were created for carbamate pesticides sorption and their application for the extraction of carbamate pesticides prior to HPLC analysis was demonstrated.

In this paper, trap grease catalytic esterification with methanol was performed under microwave irradiation providing high conversion with relatively short reaction time.

A technique was successfully developed for the determination of metronidazole in pharmaceutical and biological samples using a sensor based on a nanostructured screen-printed gold electrode obtained using a simple metal pre-treatment process followed by modification with a SAM of cysteine. The proposed sensor is a potential candidate for mass construction and miniaturization.

After use of refined palm oil for frying chicken, level of free fatty acid (FFA) and unsaturated fatty acids (UFAs) increased. Due to the antagonistic effect of UFAs and FFA, the ester content of used palm oil biodiesel was slightly lower than for refined palm oil biodiesel.