JBCS

This paper presents a simple method for the determination of K in silicate rocks by flame atomic emission spectrometry.

Nb₂O₅ (NbPC), Al₂O₃ (AlPC) and Nb₂O₅/Al₂O₃ (NbAlPC) as alternative pretreatment for carbon steel AISI 1005 coating systems and subsequent analysis by Electrochemical Impedance.

Biofilms prepared by the casting technique (CH, CHG1 and CHG2); measurement of hardness and elastic modulus by linear regression of the contact angle to assess glycerol influence over the wettability and flexibility of biofilms.

The silica from rice husk ash and the sludge from a water treatment plant when inserted in kaolinite clay provide an increase on vitreous phases as mulite and cristobalite in ceramic plates generating a high mechanical and thermal resistance.

Ananas comosus crown was applied for water-based pretreatment at moderate temperatures and enzymatic hydrolysis and fermentation experiments for ethanol and briquettes production.

Formation shceme of Zn(II) complexes with 8-HQ derivatives with substituents N-acyl-hidrazone type substituents and two chloros

Twenty-nine compounds were revealed by GC-MS and UFLC-DAD-MS/MS in the leaves of Eugenia florida as well as their antioxidant and cytotoxic activities.

The halide-bridge cleavage reaction of the [Pd(C²,N-bzox)(µ-Cl)]₂ compound with ethylenethiourea (L) in the 1:2 molar ratio yielded the cyclopalladated compound [Pd(C²,N-bzox)(X)(L)] {X = Cl^- (1); Br^- (2), I^- (3)}.

At the calcination temperature 550 °C, the Cu-MCM-41 catalyst exhibited excellent activity and stability for the DMC synthesis.

Steps for development of certified reference material (CRM), and the peaks of maximum absorbance of the CRM of holmium oxide solution developed for calibration of spectrophotometers.

Acetaminophen or paracetamol is a simplified chemical structure of aniline derivatives and it is used as analgesic agent. Several modifications in its structure particularly on electronic and solubility parameters were performed, seeking the development of safer derivatives.

Metal-Organic Frameworks (MOFs) are a class of porous inorganic solids, in a borderline area between coordination chemistry and material science. Recent research progress in synthesis and potential environmental applications are discussed in this paper.

Based on spectrophotometry, Ellman's assay correlates activity of cholinesterases with Beer's Law. In absence of an organophosphorus inhibitor, formation of thiol chromophore leads to higher absorbance, which means high activity.

Low-cost flow analysis system: the peristaltic pump and the photometer developed in this work allow the implementation of practical disciplines, such as molecular absorption spectrophotometry and flow analysis system in undergraduate chemistry courses.

Methods for biofuel analysis, a topic with relevant socio-economic impact were discussed and compared to help students to gain insight into transesterification mechanism, an important example of acyl-transfer reactions.

Microwave-assisted synthesis of umbelliferone (7-OH-coumarin) carried out in a domestic microwave oven. Observation of its fluorescence and deprotonation in basic conditions under UV-365 nm lamp.

The use of case resolution on the reduction of sugar content in processed natural juices for the training of future professionals of Chemistry.

This study aimed to identify cadmium in low-cost jewelry from China. In the qualitative test, sulfide was used as precipitating agent. Quantification of Cd²⁺ was performed by atomic absorption spectrometry. The content of Cd was ~ 30% (w/w) in one of the investigated pieces.