JBCS

The formation of the charge transfer complex was also confirmed by both infrared and ¹H NMR measurements. The thermodynamic quantities of the complex were estimated. A new spectrophotometric method was developed for the determination of taurine.

The relative protection factor (RPF) of rosemary extract in biodiesel was studied in the presence of metallic ions. The phenolic compounds present in rosemary extract protected the biodiesel and Co²⁺ and Fe²⁺ ions led to the degradation.

Flowers and seeds of Tapirira guianensis Aubl. (Anacardiaceae) afforded new bioactive alkenyl dihydrobenzofuranoids besides known compounds. Unsaturated fatty acids are predominant in seed's oil.

Ethyl acetate and methanol adsorb on the Mg-La catalyst surface forming intermediates that are identified by the combination of DRIFTS and MS techniques. The intermediates reaction products suggest that a mechanism of Eley-Rideal predominates in the reaction catalyzed by Mg-La.

The volatile compounds found in cachaça can come from the raw material used in the production of the drink, during the fermentation process, distillation or aging in wooden barrels, providing essential aromas and flavors for quality cachaça.

In this study, we aimed to tune the catalytic features of the lipase from Rhizomucor miehei immobilized on chitosan hybrids beads by altering the chemical activation conditions of the support.

The non-destructive and non-invasive extraction process of papaya's VOCs by SPME was optimized using an experimental design. The variables conditioning time and fiber exposure time were evaluated. The optimal conditions were found by analyzing the response surface.

Oxidative stability and the cold filter plugging point of biodiesel blends made from fats and soy oil in different proportions were evaluated.

The chitosan extracted from chitin, present in insects, fungi, and arthropods is cross-linked in order to obtain chitosan spheres. The novel physical characteristics obtained are applicable in several areas.

Drug screening combined with the use of mathematical models has been shown to be an important strategy for predicting the susceptibility of microorganisms to drugs.

The perovskite nanocrystals have emerged as a new class of promising materials in optoelectronics, due to their high photoluminescent quantum yield, short decay times and narrow emissions bands that covers the entire visible spectrum mainly by the composition control.

The success of the elemental enrichment of foods depends on chemical speciation studies and allows to supply macro and microelements deficiencies.

The construction of a lab-made contact angle measuring device by using 3D-printing technology.

An easy and efficient laboratory experiment designed for undergraduate students by using ultrasound assisted extraction for subsequent determination of total lipids in food samples.

A new undergraduate experiment was developed based on the comparison of generics and brand name drug. Extraction of paracetamol and tablet mass checking with statistic considerations were also addressed, simulating quality control.

Are we ready for argumentation in chemistry classrooms? An investigation into pre-service teachers' readiness for promoting argumentation.

Practical didactic sequence using the Debus-Radziszewski reaction to teach multicomponent reactions.

This article brings up the Dalton - Gay-Lussac - Avogadro debate, which took place in the early 19^th century. Such a discussion allowed the assumption of gaseous diatomic molecules. The original figure from the Dalton's paper was modified by the author, with the intent of representing the conceptual change that the Dalton's Theory underwent.

Alchemical "gold": tin samples before and after treatment with calcium polysulfide. The gold colour is due to a coating of mosaic gold, or stannic sulfide