Authors:M. Ştefănescu, O. Ştefănescu, M. Stoia, and C. Lazau
paper we present a study on the synthesis of Fe(III) oxide, by thermal decomposition
of some complex combinations of Fe(III) with carboxylate type ligands, obtained
in the redox reaction between some polyols (ethylene glycol (EG), 1,2-propane
diol (1,2PG), 1,3-propane diol (1,3PG) and glycerol (GL)) and NO3–
ions (from ferric nitrate). Fe2O3
was obtained by thermal decomposition of the synthesized metal-organic precursors
at low temperatures. γ-Fe2O3
was obtained as nanoparticles at 300C, while at higher temperatures α-Fe2O3
starts to crystallize and becomes single phase at ~500C.
formation of the metal-organic precursors and their thermal decomposition
were studied by thermal analysis and FTIR spectroscopy.
of Fe2O3 crystalline phases
with the thermal treatment of iron complexes was followed by RX diffractometry.
The size of γ-Fe2O3 nanoparticles
was estimated by transmission electron microscopy (TEM).
Authors:Lidia Jasińska, A. Balas, J. Haponiuk, G. Nowaczyk, and S. Jurga
New cross-linked poly(esterurethanes) (PEU) based on unsaturated olygo(alkyleneester)diol
(OAE), 4,4’-diphenylmethane diisocyanate (MDI) and styrene or methyl
methacrylate as curing monomers were prepared. The synthesis of PEU was performed
in two steps. In the first step OAE was obtained from adipic acid, maleic
anhydride and ethylene glycol. In the second step a prepolymer was obtained
in a reaction of OAE with different amounts of 4,4’-diphenylmethane
diisocyanate followed by crosslinking using previously mentioned curing monomers.
The influence of structure of the poly(esterurethanes) on thermal and dynamic
mechanical properties is studied. Thermogravimetric analysis shows that cross-linked
poly(esterurethanes) demonstrate high thermal stability. Moreover the dynamic
mechanical thermal analysis shows that the presence of styrene cross-linking
chains in polymers lead to the phase separation in cross-linked poly(esterurethanes).
Authors:Mirosław Hawrył, Małgorzata Niemiec, and Monika Waksmundzka-Hajnos
Two-dimensional separations were performed on polar bonded stationary phase of type cyanopropyl-silica and diol-silica by use of non-aqueous eluents (polar modifier dissolved in n-heptane) as the first direction eluents and aqueous eluents (organic modifier — MeOH dissolved in water) as the second direction eluents. The chromatographic process was performed in micro scale using 5 × 5 cm plates, small volumes of eluents, and 10 μL of plant extracts to obtain satisfying separation. Plates developed in horizontal chambers were dried and observed in UV light (254 nm and 366 nm) photographed by digital camera and derivatized by 1,1-diphenyl-2-picrylhydrazyl (DPPH) to detect antioxidants (free radical scavengers) or derivatized by Naturstoff reagent to detect phenolic compounds (characteristic luminescence of some phenolic compounds). The above experiments give the possibility to construct fingerprints for investigated Mentha species and varieties and preparations containing the herb. It can be used in quality control of the plant material and its antioxidative activity.
The intestinal microflora
has been adapted to utilize, as a source of energy, complex carbohydrates that escape hydrolysis by human digestive enzymes, for example fructo-oligosaccharides (FOS). The ability of intestinal microflora to utilize carbohydrates in complex mixtures is of particular interest, even though few data have been reported. This paper presents the results obtained using an innovative analytical approach based on instrumental HPTLC-AMD (automated multiple development) to investigate the metabolic behavior of
MB 239 as a case study. Raffinose, FOS (sucrose, 1-kestose, nystose, fructosyl-nystose), lactose, and their monomeric moieties glucose, galactose, and fructose were simultaneously present as carbon sources in the solution to be fermented by the bacterium. The method proposed has enabled quantitative monitoring of sugar concentrations during the entire time-course of the processes. The complex sugar mixtures were separated by use of acetonitrile-acetone-water mobile phases on diol layers derivatized with 4-aminobenzoic acid.
m- and p-Chloroanisole were dechlorinated in the presence of a supported noble-metal catalyst (Pd/C or Rh–Pt/C) at 30 °C in a solution
of 2-propanol containing NaOH. The addition of a small amount of methanol (1% v/v) to the 2-propanol solution greatly enhanced
the rate of dechlorination of p-chloroanisole with Pd/C but retarded the rate with Rh–Pt/C. Other primary alcohols (1% v/v) enhanced m-chloroanisole dechlorination over Pd/C in the following order: methanol (enhancement factor, 10.6) > ethanol (3.3) > 1-propanol
(2.1) > 1-butanol (1.0). When a secondary alcohol (2-butanol), tertiary alcohol (t-butyl alcohol), diol (ethylene glycol), or triol (glycerin) was added at 1% (v/v), the dechlorination rates were unchanged
or retarded. We found that Pd/C was activated effectively by pretreatment with a solution of 2-propanol/methanol (99:1 v/v)
Authors:P. Ramanjaneyulu, Y. Sayi, T. Newton Nathaniel, A. Reddy, and K. Ramakumar
Boron concentration has been determined in groundwater samples, collected from Khuchch, Gujarat, India, by prompt gamma neutron
activation analysis (PGNAA) after selective separation and pre-concentration by solvent extraction with 10% 2-ethyl hexane
1,3-diol in CHCl3. Solvent extraction separation helped to eliminate the interfering elements in PGNAA determination of boron. The sensitivity
of PGNAA is found to be 18.83 cps/mg B based on the slope of a calibration plot obtained by carrying out measurements on synthetic
boric acid samples containing boron in the range of 30–150 μg. Detection limit of the method is 0.2 μg/g counted for 35,000
seconds at a sample size of 15 gram. The precision (relative standard deviation at 1σ level) and accuracy of the method is
5%. The analytical results of the present method agreed well with well-established spectrophotometric determination of boron
as boron-curcumin complex and inductively coupled plasma atomic emission spectroscopy (ICP-AES).
Authors:A. Rekondo, L. Irusta, and M. Fernández-Berridi
The thermal behaviour of a new kind of hybrid system based on silanized poly(ether-urethanes) (SPURs) has been analyzed by
thermogravimetric analysis (TG). The influence of the chemical nature of employed alkoxysilanes, polyether diol molecular
weight and the physical state of the obtained hybrids (cured and non-cured) has been studied. The results show that in the
non-cured state, aminosilane-based systems present a higher stability compared with those based on isocyanatesilane. However,
in the cured state, both types of hybrids present a similar thermal stability, but much higher than their corresponding partners
before the curing process. The presence of the inorganic silica network improves the thermal stability of all the systems
Authors:Łukasz Komsta, Robert Skibiński, Anita Iwańczyk, and Genowefa Misztal
The normal-phase thin-layer chromatographic behavior of five statin-like drugs — atorvastatin, cerivastatin, fluvastatin, lovastatin, and simvastatin — has been investigated. Chromatograms on silica gel, diol, and CN layers were developed with binary mobile phases containing hexane and a polar modifier in different proportions. The
values obtained with all the mobile phases were then used to calculate
equations, assuming linear dependence of
on the volume fraction of the mobile phase modifier, on the mole fraction of the modifier, and on their logarithms. The correlation between regression coefficients within and between models were investigated in depth. The coincidence between regression coefficients were also investigated by calculating
rank correlation, and the similarity between modifiers was also checked by use of dendrograms.
Authors:Robert Skibiński, Genowefa Misztal, Łukasz Komsta, and Agata Korólczyk
Chromatographic behavior in normal-phase thin-layer chromatography has been investigated for six atypical antipsychotic drugs (amisulpride, clozapine, olanzapine, quetiapine, risperidone, and ziprasidone). The drugs were separated on silica gel, alumina, NH
, CN, diol, and polyamide plates with mixtures of
-hexane and six polar modifiers (acetone, dioxane, diethylamine, ethanol, isopropanol, and tetrahydrofuran) as mobile phases. The linearity of relationships between
and volume fraction of modifier, the logarithm of the volume fraction, the molar fraction, and the logarithm of the molar fraction was tested. The results usually fitted the
> 0.9. The best separation was achieved on silica gel plates with ethanol-
-hexane, 1 + 1 (
), containing 1.5% aqueous ammonia, as mobile phase.
– 14] . Methanol solutions in some respects show similar properties to those of aqueous solutions and in others they resemble DMF solutions. Recently, we have turned our attention to systems containing a diol as a non-electrolyte. The wide applications