Hydrogen bromide-catalysed reaction of acrolein, malonaldehyde, paraformaldehyde and acetaldehyde with aniline was investigated in connection with the mechanism proposed for the quinolizinium bromide (I)-aniline reaction. Acrolein undergoes retrograde aldol-like fragmentation possibly with the f...
Lipid peroxidation often occurs in response to oxidative stress, and a great diversity of aldehydes are formed when lipid hydroperoxides break down in biological systems. Some of these aldehydes are highly reactive and may be considered as second toxic messengers which disseminate and augment in...
Malonaldehyde (MA) in gamma-irradiated apple juice was measured using a GC–MS method and in comparison to the thiobarbituric acid (TBA) assay. The profiles of MA content as a function of radiation dose were similar using both methods, however, MA content was higher when measured with the TBA as...
The enhancement effects of α-, β-, γ;- and hydroxypropyl-β-cyclodextrins on the fluorescence of a 2:1 thiobarbituric acid/malonaldehyde adduct in acid aqueous solutions have been studied. The best characteristics as a fluorescence enhancement agent showed hydroxypropyl-β-cyclodextrin which ...
An acetalation-acid decomposition procedure was developed to investigate the formation of malonaldehyde from a wide assortment of primary and secondary lipid oxidation products. The formation of malonaldehyde as the tetramethyl acetal derivative was determined quantitatively by gas chromatograph...
Formation and inhibition of malonaldehyde (MA) from blood plasma lipids oxidized by Fenton's reagent in the absence or presence of probucol [4,4′-(isopropylidenedithio)bis(2,6-di-tert-butylphenol)] and l-ascorbic acid were investigated. The amount of MA formed was quantitatively analysed b...
Reduction of malonaldehyde bis(ethylene and propylene acetals) with borane or monochloroborane produces diether diols 1 and 2 in high yield. Similar reduction of glyoxal bis(ethylene acetals) has only limited utility for the preparation of tetrasubstituted triethylene glycols 3. Organotin chemis...
SummaryA histoenzymic study of cerebral phosphatases and esterases was performed on rats subjected to experimental intoxication with mercury phenylacetate. Following intragastric application of mercury phenylacetate to experimental animals, decreased activities of cerebral ATPase, acP and AChE w...
Esterification of phenylacetic acid with phenol, cresols, nitrophenols and resorcinol has been carried out in the presence of montmorillonite clay exchanged with H+-ions, Al3+-ions and polyhydroxy oligomer cations of Al. Na+-montmorillonite (raw clay) was inactive, H+- and Al3+-montmorillonites,...
Recently, a new one step method was developed for synthesizing a methyl substituted alumatrane directly from aluminum hydroxide [Al(OH)3] and triisopropanolamine (TIS). The structure of TIS-Al was characterized using DSC, TGA, FAB+-MS, NMR (1H-, 13C-, 27Al-), and FTIR. Triethylenetetramine (TETA...
Recent work on the strength-enhancing mechanism of triisopropanolamine (TIPA) suggested that TIPA enhances the mechanical properties of mortar and concrete by acting on the interfacial transition zone (ITZ) between paste and sand or aggregate rather than improving the properties of the hydrated ...
The solubilities of carbon dioxide in aqueous solutions of tertiary amine, i.e. triisopropanolamine, have been measured at 313.15, 323.15, and 333.15 K and over the partial pressures of carbon dioxide ranging from 1 to 3000 kPa. The treated concentrations of aqueous triisopropanolamine solutions...
This study addresses the hydration mechanism of a P.II 52.5R cement in the presence of triisopropanolamine (TIPA), glucose or both. Calorimetry tests showed that the interaction effect of TIPA and glucose significantly enhanced the degree of hydration of the cement after 7 days. X-ray diffractio...
In this work, a kind of magnetic graphene oxide composite material (TI/[email protected]3O4) for Pb2+ removal was successfully synthesized through in situ growth method. Briefly, metal ions (Fe3+) were fixed on GO surface by oxygen-containing functional groups and acted as growth centers of Fe3O...
The effects of triisopropanolamine (TIPA) on the strength development and hydration kinetics of a ternary cement containing slag and CaCO3 were investigated by mixture design. The strength development of the blend was considerably enhanced by the accelerated chemical reactions on each component....
This paper investigated the impacts of sulfate adjustment on strength, hydration and the microstructure of cement with triisopropanolamine (TIPA) to propose the mechanism of early strength enhancement from the microscopic point of view. The results showed that a single addition of TIPA was only ...
This paper aims to investigate the effect of triisopropanolamine (TIPA) on compressive strength and hydration of cement-fly ash paste. The samples with various dosages of TIPA were prepared with 30% fly ash (FA) and 70% cement (water/binder ratio by weight = 0.38), and cured under the standard c...
Fly ash (FA) has been accepted as one of the most popular supplementary material in blends with cement. However, high content of FA added would result in very slow strength development at the early age, and this problem limits the use of FA in precast concrete. In this study, an attempt was made...
Novel intercalation compounds of kaolinite with selected benzylalkylammonium chlorides, obtained using methoxy-kaolinite as a precursor, were characterized by 13C, 27Al, and 29Si solid-state NMR and infrared (FTIR) spectroscopy. The analyses allowed the confirmation of both the formation and str...
The mixed micelle formation between tetradecyltrimethylammonium bromide (TTAB) and benzyldimethylhexadecylammonium chloride (BDHAC) has been investigated in the absence as well as attendance of urea using conductivity technique. The evaluated values were examined in accordance with Rubingh model...
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