This study investigated the effects of the electrolytic treatment in the simulated wastewater with aromatic amine nphenyl-n-isopropyl-p-phenylenediamine (Flexzone 3P) using Ti/TiRuO2 electrodes under 0.025 A/cm 2 (DC) for different electrolysis durations (5; 15; 30; 45 and 60 min). Conductivity, pH, UV-visible spectra, gas chromatograms, toxicity and biodegradation tests were carried out. Durin...

This paper addresses the use of self–organizing maps for baseline construction in chromatograms. Unlike local techniques, the problem is seen in terms of global optimization: a straight and smooth path including sampled points with high significance for baseline membership is to be found. For their smoothing capabilities, and for reproducing the probability density function of the input, self–o...

A technique to detect residual tetracyclines (TCs) in honey by HPLC and derivative UV-Vis spectra is examined in this study. Chromatograms of honey products often experience overlapped peaks and sloping background due to similar retention properties of components or to the presence of impurities. The derivatives provide resolution of overlapped peaks in an UV-Vis spectrum and eventually bring c...

Rats fed a diet supplemented with L-cystine excrete in the urine taurine, hypotaurine (l-3), and possibly cystamine disulfoxide (4)) although the excretion of the last mentioned compound is not certain (3). It was recognized earlier (1) that paper chromatograms of the urine of these rats showed another ninhydrin-positive spot which moved more rapidly than did taurine incollidine-lutidine solven...

Thin-layer chromatography methods on the preparative and analytical scale are presented for the separation of porphyrin methyl esters according to the number of ester groups in each porphyrin. Complete and sharp separations are obtained on silica gel glass plates or aluminium cards run in benzene-ethyl acetate-methanol solvent systems. Dicarboxylic porphyrin esters from proto-, deuteroand hemat...

1,9-Diamino-5-azanonane (1, H2N(CH2)4NH(CH2)4NH2), symmetrical “homospermidine,” previously unreported in nature, has now been discovered in sandal (Santalum album L.), where it comprises 0.5-1.5% of the weight of the dried leaves. The new polyamine is conveniently isolated from an aqueous extract of the leaves by ion-exchange 1^) uring a routine examination of the amino acids from an ethanolic...