JBCS

The aim of this review is to provide insight into porphyrin chemistry research in Brazilian institutions, especially that involving catalytic purposes, and discuss some advances achieved in the topic with the collaboration of researchers from the Universidade de Aveiro, Portugal.

In this review we present the state of the art of (bio)conjugation strategies applied to semiconductor quantum dots for biomedical / bioanalytical purposes.

A new tetraglycosylated flavonoid was isolated from the butanol extract of leaves of Platycyamus regnellii using high-speed countercurrent chromatography (HSCCC).

Acid hydrolysis of regular corn starch under external electric field greatly reduces the reaction time and increases starch crystallinity. Amylose and amylopectin are depicted in light and dark pink, respectively.

Multi-energy calibration (MEC) was successfully employed to nutrients determination in beef and meats of sheep and chicken by inductively coupled plasma optical spectrometry (ICP OES).

A simple and innovative method to identify gunshot residues and discriminate ammunition of six different calibers employing total reflection X-ray fluorescence (TXRF) and chemometric tools.

Synthesis of a hybrid monolith using a thiol-ene click chemistry reaction, for use in capillary liquid chromatography.

Titanium dioxide nanotubes were obtained through anodization, and its surface was modified through layer-by-layer (LbL) self-assembly or cysteine adsorption to attach gold ions, which were reduced in Au(0) to be used as photocatalysts for hydrogen production.

Nanocomposites kaolinite/TiO₂/phthalocyanine and molecular structures of organic pollutants used in photodegradation studies.

Correlation between surface-enhanced Raman scattering (SERS) spectrum and gold nanorod cluster structure; end-to-end with side-by-side interactions may lead to strong enhancements.

Larvicidal action of organophosphorothioates derived from cardol through inhibition of the acetylcholinesterase enzyme.

Silver and gold nanoparticles were formed by irradiating the metal salt in the presence of a thioxanthone-derivated chitosan that acts as photoinitiator and stabilizer.

Water-soluble Mn^I compounds release CO when exposed to light. The proposed mechanism occurs in two steps, with photo and redox processes.

Biosensor based on new carbon ceramic electrode prepared with silica-titania/graphite composite and modified with chitosan for tyrosinase immobilization.

Natural products produced by Streptomyces chartreusis strains associated to Brazilian fungus-growing ants. Absolute configurations of strepchazolin A (3) and strepchazolin B (4) were determined by vibrational circular dichroism (VCD) and ecological function of cyclooctasulfur (5) was established.

Oxygen reduction reaction (ORR) catalyzed by nanoparticles of Fe₂O₃ and Co₃O₄ applied on the surface of a glassy carbon electrode (GCE).

The influence of seasonality on chemical composition, antioxidant and antifungal activities of Piper glabratum essential oils was evaluated. The two-dimensional gas chromatography coupled with quadrupole mass spectrometry (GCxGC/qMS) allowed the detailed chemical characterization and the oils showed biological activities. Composition and activities were influenced by seasonality.

Electrochromic and fluorescent device based on poly(fluorene-bisthiophene) derivative.

High throughput mass spectrometry platform for prospecting high value chemicals from bioconversion of glycerin by filamentous fungi.

The bioaccessibility of Zn was determined from yogurt by flame atomic absorption spectrometry (FAAS). Slurry sampling procedure, in total Zn determination in yogurt by FAAS, was used.