Special Collection

Main characteristics and perspectives of the researches on flow analysis.

Portable energy dispersive X-ray fluorescence spectrometry was evaluated in the in situ analysis of fresh sugar cane leaves aiming at real time plant nutrition diagnosis.

Pesticides are undesirable contaminants often present in food samples, particularly in fruits. A preliminary step (extraction) is conducted to transfer the pesticides from the original fruit matrix (in this paper matrix solid-phase dispersion (MSPD) was used) to a chromatographic system (in this paper gas chromatography with electron-capture detection (GC-ECD) was used) in order to determine the target compounds.

The use of nuclear magnetic resonance (NMR) calculations can facilitate the total synthesis of natural products of uncertain structural assignment.

This figure illustrates a pedagogical link-making in the context of teaching and learning scientific conceptual knowledge.

Phenomenological studies allow a thorough description of laboratory learning environments. Through its analysis researchers gather a better understanding of how learning in the lab occurs. This knowledge informs pedagogical decisions and the design of curricular reforms.

Submarine groundwater discharge plays an important role on the biogeochemistry of the oceans. How much do we know about this process in South America?

Working principle and electrode materials of electrochemical systems for energy conversion from proton and salt gradient.

Supercapattery is a generic term for a large number of hybrid electrochemical energy storage devices that combine the merits of supercapacitor and rechargeable battery. For engineering design, it is imperative to understand the charge storage mechanisms in the electrodes so that high voltage and space-material efficient stack of multiple cells can be manufactured with optimal performance and commercial affordability.

Grafting quinone molecules on porous carbons improves their charge storage properties for application as electrode in energy storage systems.

Chiral HPLC (high performance liquid chromatography) constitutes a central part in the evaluation of the organocatalytic potential of new ligands in prototypical asymmetric reactions. The graphical abstract correlates in a wordplay a high ee (enantiomeric excess) chromatogram with a good Cat* (catalyst) and a racemic chromatogram with an unsatisfactory Cat*.

Cellulosic materials and sugarcane bagasse polysaccharides were converted to furan compounds using ZnCl₂/HCl or AlCl₃/HCl in a biphasic system.

Multienzymatic screening is an interesting and promising methodology that makes possible the simultaneous monitoring of two or more enzymatic activities, in the same microorganism, using fluorogenic probes with different emission wavelengths.

Separation of strategic elements based on magnetic nanohydrometallurgy.