Streptomycin (STR) and dihydrostreptomycin (DHSTR) are two of the most common aminoglycoside antibiotics used in veterinary medicine. The physicochemical properties of both substances, make their determination challenging. In the present study the development of methods based on ion-pair chromat...
In this work, a membrane dispersion microreactor was applied for the hydrogenation of streptomycin (STR) to produce dihydrostreptomycin (DHS). The reductant was dispersed into the continuous phase containing STR, leading to a significant increase in the mass-transfer specific surface area, and t...
A novel method for the non-derivatization liquid chromatographic determination of streptomycin (STR) and dihydrostreptomycin (DHSTR) was developed and validated based on evaporative light scattering detection (ELSD). Utilizing a ThermoHypersil BetaBasic C 18 analytical column, evaporatio...
An interlaboratory study was proposed to the European Community and Third Countries National Reference Laboratories (NRL) for the analysis of aminoglycoside residues in bovine milk by ELISA. This test was intended to allow the participants to control their aminoglycoside ELISA methods and also t...
We have studied the in vitro effect of sodium saccharin (NaSacch) on the rat adipocyte adenylyl cyclase complex. NaSacch (2.5-50 mM) inhibited significantly in a dose-dependent manner basal and isoproterenol-stimulated cAMP accumulation on isolated rat adipocytes. Similarly, NaSacch (2.5-50 mM) ...
Two new series of benzenesulfonamide (4a–f, 5a–b, 6, 7) and 1,2‐benzisothiazol‐3(2H)‐one‐1,1‐dioxide (9a–c, 10, 12a–d) derivatives were prepared starting from saccharin sodium. The novel compounds were characterized using elemental analyses and different spectroscopic methods. Assessmen...
Sodium saccharin (SS) is a commonly used synthetic sweetener in carbonated soft drinks and beverages. Long-term consumption of SS could result in health problems. Here, a sensitive surface-enhanced Raman spectroscopy (SERS) method with silver nanorod (AgNR) array substrates was explored for quan...
The effects of sodium saccharin and sodium dodecyl sulfate (SDS) additives on the amount of incorporated tungsten carbide (WC) particles and morphology of the coatings are investigated. The structure and morphology of the coatings are determined by scanning electron microscopy techniques (SEM). ...
A sodium saccharin (NaSac) diet was used to induce cell damage and regeneration in the urothelium of the male rat urinary bladder. Foci of terminally differentiated superficial cell exfoliation were detected after 5 weeks and their number increased after 10 and 15 weeks of the diet. At the sites...
The osmotic coefficients of aqueous solutions of potassium acesulfame (0.67 mol kg−1), sodium saccharin (0.75 mol kg−1), and tetramethylammonium (0.55 mol kg−1) and ammonium (0.35 mol kg−1) cyclohexylsulfamates were determined up to the molality indicated in parentheses. The osmotic coefficients...
Cobalt-iron (Co-Fe) alloy thin films ( with , 6, 11, 14 and 18) were electrodeposited on brass substrates from sulfate plating baths containing saccharin salt. The electrolyte in the synthesis process consists of mixtures of , , NaCl and . Various concentrations of were added to the plat...
The aqueous air oxidation of p-nitrotoluene-o-sulfonic acid (NTS) to prepare 4,4′-dinitrostilbene-2,2′-disulfonic acid (DNS) is studied. It is shown that the by-product formation results from either the direct oxidation of NTS or DNS destruction or both under certain conditions. Based on the e...
5-Amino-2-formylbenzene sulfonic acid (ABAS) as a by-product during reduction of 4,4′-dinitrostilbene-2,2′-disulfonic acid (DNS) by Zero-Valent Iron has been detected. Experiments show that the pH and temperature are the most important factors controlling the formation of ABAS. In addition, di...
This research is aimed at improving the understanding of the reduction of 4,4′-dinitrostilbene-2,2′-disulfonic acid (DNS) by zero-valent iron for the manufacture of 4,4′-diaminostilbene-2,2′-disulfonic acid (DSD). The formation of 5-amino-2-formylbenzene sulfonic acid (ABAS) during the proce...
Gold nanoparticles supported on four different metal oxides were prepared and applied in the chemoselective reduction of 4,4′-dinitrostilbene-2,2′-disulfonic acid (DNS). With sodium formate as hydrogen source, >99% of the DNS was transformed into 4,4′-diaminostilbene-2,2′-disulfonic acid (DS...
Neuronal death associated with cerebral ischemia and hypoglycemia is related to increased release of excitatory amino acids (EAA) and energy failure. The intrahippocampal administration of the glycolysis inhibitor, iodoacetate (IOA), induces the accumulation of EAA and neuronal death. We have in...
HPLC and electrospray ionization tandem mass spectrometry were used to show that ∼30% of the DNS present in wastewater was reduced to 4-amino-4′-nitrostilbene-2,2′-disulfonic acid and 4,4′-diaminostilbene-2,2′-disulfonic acid during multiple-effect evaporation. A novel recovery method, whic...
The aqueous air oxidation of 4, 4'-dinitrobibenzyl-2,2'-disulfonic acid (DND) to prepare 4,4'-dinitrostilbne-2,2'-disulfonic acid (DNS) is studied. It is shown that the by-product formation results from the destruction of DNS under certain conditions. Grounded on the experimental data, the rate ...
The effect of lipophilic [ N -(3,5-di- tert -butyl-4-hydroxybenzyl)- N , N -di(2-pyridylmethyl)]-amine and its water-soluble hydrochloride on the oxidative status of tissues of Wistar rats in vivo was studied. The change in the xanthine...
Complexes of organotin compounds R2SnCl2 with bisand trisphosphonate derivatives of 2,6-di-tert-butyl-4-methylphenol (ionol) were synthesized. X-ray diffraction studies were carried out for some of them. The redox properties of the synthesized compounds were characterized by cyclic voltammetry. ...
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