JBCS

Carbon paste electrode modified with Vulcan-carbazone presenting electroanalytical response for Cu²⁺ ions.

Laser-based analytical techniques for direct qualitative evaluation of orthopedic Ti alloys, and results comparison with data obtained after microwave-assisted digestion and inductively coupled plasma optical emission (ICP OES) determination.

For metal oxides doped carbon aerogel (CA), the n-type and p-type semiconductors exhibited different electrocatalytic effect for phenol removal, and the former has higher effect.

A simple, sensitive and reliable DPX/LC-UV (disposable pipette extraction using liquid chromatography with ultraviolet detection) method for the rapid determination of creatinine levels in urine samples.

An outstanding compound was found to possess slightly more potent antibacterial activity against several bacterial strains than the reference drugs.

Chemometric analyses of ¹H high-resolution magic angle spinning nuclear magnetic resonance (¹H HR-MAS NMR) data for the chemotaxonomic investigation of Hancornia speciosa (mangaba) varieties.

Synthesis of novel eugenol esters designed to inhibit the Leishmania rCPB 2.8 enzyme and in vitro evaluation of their biological activity. The molecular modeling study investigated the possible mechanisms of activation and inhibition exerted by some of these compounds on the enzyme rCPB 2.8.

Development and validation of a rapid and reliable reversed-phase high-performance liquid chromatography with photodiode array detection (RP-HPLC-PDA) method for quantifying six diterpenes in three species of Brazilian Copaifera oleoresins: C. duckei, C. reticulata and C. multijuga.

Two hybrids containing the indanone-piperidine moiety of donepezil and lipoic acid scaffolds were synthesized. One hybrid displayed moderate inhibitory activity against hAChE and greater activity against hBuChE. It also showed a good antioxidant activity, exhibiting better ability in scavenging 2,2-diphenyl-1 picrylhydrazyl (DPPH) radicals than lipoic acid.

A fast and simple analytical method was firstly proposed for the determination of iron (Fe) in crude and refined vegetable oil samples by employing the conventional flame atomic absorption spectrometry (FAAS) technique and microemulsification as sample preparation procedure.

As shown in the figure, n-octanol, which was used as the extractant, and hydrophobic oleic acid modified Fe₃O₄ nanoparticles (Fe₃O₄@OA NPs), as an efficient adsorbent, were applied to retrieve the primary aromatic amines (PAAs)-containing n-octanol in the dispersive liquid-liquid microextraction (DLLME) step.

New naphthopyranone dimer named planifoliusin A isolated from Paepalanthus planifolius.

β-Carboline alkaloids were identified in passionfruit by using UHPLC-MS (ultrahigh performance liquid chromatography-mass spectrometry) and SBSE(PDMS) (stir bar sorption extraction using polydimethylsiloxane as stationary phase) techniques.

A full factorial design was utilized to synthesize and to statistically study thermal properties of montmorillonite/poly(methyl methacrylate) nanocomposites.

Starting from 3-amino and/or 3-nitro-4-hydroxypyranoquinolindione, some novel 1,4-oxazinopyranoquinolinone derivatives have been synthesized.

Antibiotics in the aquatic environment are present at low level. This method was applied for quantification of 46 analytes. The validation tests showed good performance for the surface and drinking water. The method was applied to evaluate these compounds in samples from Rio de Janeiro.

Three antibacterial 3,4-seco-diterpenes were isolated from hexane extracts of roots of individual specimens of Croton blanchetianus Baill.

Production of a mussel reference material: from the living organism to certified mass fractions in bottles.

Precise average manganese valences (ν) for Mn oxides are attained spectroscopically. When the oxides react with Fe²⁺, Mn^ν+ is reduced to Mn²⁺; thence [Mn²⁺] is determined by AAS and excess [Fe²⁺] by MAS (after Fe²⁺ complexation with o-phenanthroline), enabling the determination of ν.

DKH2-B3PW91/DZP+1d-DKH optimized ground state electronic structures for the gold clusters, Au_n (n = 3-8).

A very efficient SrO-based magnetic heterogeneous catalyst was developed in the studies presented herein. Biodiesel was produced from babassu oil transesterification with high yields in four catalytic cycles.

The interaction strength order is quantified in terms of the ΔH and ΔG of substitution of four water molecules from the [Ca(H₂O)₆]²⁺ by bidentate dithiolene ligands.

Comparison between microwave digestion and ultrasound assisted extraction (UAE) was made. UAE presents better performance compared to microwave digestion in arsenic extraction. Accuracy performance was close to 100% for all three methods developed. Bean samples cultivated in impacted areas presented 0.3 µg g^-1 of arsenic concentration.

The absolute stereochemistry of clemateol was established on the basis of detailed NMR spectroscopic evidence (³J_H-H analysis, derivatization as Mosher's esters and NOESY) and also by resonance scattering effects in the single crystal X-ray diffraction experiment of its (R)-mandelic acid ester derivative.

Solid phase microextraction (SPME) fibers for use as passive sampler of endocrine disrupting chemicals as triclosan, bisphenol A and 17α-ethinylestradiol in seawater.