JBCS

The origins and current status of chemometric research in Argentina are described, including references to works in the three main areas of interest: experimental design and optimization, classification and multivariate calibration.

Direct sample injection systems, an excellent approach for green chromatography.

The results show that the essential oil obtained from the agarwood originating from A. sinensis induced by a fungal-inoculation method had a high similarity to wild agarwood, both in chemical composition and in antimicrobial activity. This is the first report of the analysis of essential oils from fungal-inoculation induced agarwood.

This paper proposes a reliable method to analyze the herbicide tebuthiuron (TBH) in sugar matrixes (brown and crystal) using square wave voltammetry (SWV) and differential pulse voltammetry (DPV) at bare glassy carbon electrode.

Peat is very rich in organic matter, and is therefore able to both adsorb and release micronutrients. This desorption of micronutrients, together with the presence of organic matter, assists the development of plants.

Aerial view of the Paraíba do Sul River delta region and the Atafona village

The crystallization of low-silica X zeolite (LSX) was studied in Na-K gel systems with different extents of replacement of Na by K while fixed content of other components. The molar ratio of K/(Na+K) affects the crystallization, composition and catalytic performance of final LSX products.

A new, simple, rapid and accurate chiral HPLC method has been developed and validated for the enantiomeric separation and quantitative determination of the isomers of human colon cancer therapeutic drug 10-Hydroxycamptothecin.

The eco-friendly compound caffeine effectively inhibited steel corrosion in acid medium by virtue of adsorption. The adsorption was consistent with the Frumkin adsorption isotherm. A hydrophobic protective film covered the steel surface.

Experiments were performed using plating and reverse transcriptase polymerase chain reaction followed by microchip electrophoresis to assess the inactivation of Alicyclobacillus acidoterrestris using saponin. The results from both approaches were compared.

In this study, chelerythrine and lupeol isolated from Zanthoxylum rhoifolium were evaluated in vitro against the enzyme acetylcholinesterase (AChE) from the venom of the snake Bungarus sindanus. The alkaloid chelerythrine presented higher activity than did triterpene lupeol.

Ten analogs of 1,3,4-oxadiazole containing dibenzosuberane moiety (8a-8j) were synthesized, characterized and evaluated for antibacterial as well as antifungal activity.

[(2-{2-[2-(Bis-methoxycarbonylmethylamino)phenoxy]ethoxy}-4-benzimidazole-phenyl)methoxycarbonylmethylamino]acetic acid methyl ester，schematic representation (left) and crystal packing to demonstrate the void cage along the c axis (right).

In the present work was evaluated the influence of AHS obtained from an area under sugarcane cultivation on the dynamics of chromium species (Cr (III) and Cr (VI)) in the environment.

A plasma process for carbon black and carbon nanotubes synthesis is presented. The decomposition of methane by thermal plasma generating hydrogen and carbon is proposed as an environmentally-friendly alternative to conventional methods. The main advantage of this process is that the carbon is obtained directly from methane without the formation of by-products.

TD-DFT calculations of the ground (S0) and excited (S1) states suggest that in 6-aminocoumarin-naphthoquinone conjugates the fluorescent 6-AC donates electrons to the naphthoquinone LUMO resulting in an oxidative photoinduced electron transfer (oxidative-PET).

This paper presents a procedure based on emulsification with formic acid and Triton X-100 for the determination of Ca, Cu, Fe, Mn, Mg, Na, K and Si in biodiesel samples by ICP OES.

A series of KF/γ-Al₂O₃ catalysts were prepared and used for the synthesis of glycerol carbonate from glycerol and dimethyl carbonate. Glycidol, the main by-product, resulted from the decomposition of glycerol carbonate.

This study describes a method for determination of cholesterol oxides in milk by direct sample saponification - extraction and RP - HPLC -DAD.

A simple UV-Vis spectrometric method is proposed to detect adulterations of diesel/biodiesel blends with soybean oil. Suitable results were obtained by using four multivariate classifcation techniques (SIMCA, KNN, PLS-DA and SPA-LDA).

A new criterion is proposed to guide the selection of variables for linear discriminant analysis (LDA) in the successive projections algorithm (SPA). The advantages of the proposed approach are demonstrated in three classification problems.