An enzyme incubation–water extraction (EI–WE) method was developed and optimised for the extraction of the natural antioxidant taxifolin and of the total flavonoids from wood sawdust of Larix gmelini (Rupr.) Rupr. A factorial design and a central composite design approach were used for method ...

Galloyl esters of quercetin and taxifolin have been recently prepared semisynthetically as part of work towards modifying the solubility and modulating the biological activity of these natural flavonoids. In this paper we focused on the liquid chromatography–mass spectrometry (LC–MS) profiling...

The present work evaluates the action of nitroreductase enzyme immobilized on Tosylactivated magnetic particles (MP-Tosyl) on three disperse dyes which contain nitro and azo groups. The dyes included Disperse Red 73 (DR 73), Disperse Red 78 (DR 78), and Disperse Red 167 (DR 167). The use of a ma...

Starch granules in excess water gelatinize in a predictable manner, where radial and tangential expansion displaces amylopectin units from granular rings as a gradual centrifugal process concluding at the granular surface. Amylopectin appears as ellipsoidal particles in waxy maize starch granule...

In the present study microflotation tests were performed on pure mineral systems involving calcite, apatite, quartz and hematite. For the two first minerals sodium oleate was employed as collector and for the two latter the collector chosen was dodecylamine hydrochloride. Purified potato starch ...

The adsorption of cationic potato starch on microcrystalline cellulose was investigated taking into account that starch is a mixture of amylose and amylopectin. The separate adsorption of both components could be calculated by determining starch concentrations twice using two methods having a di...

The kinetics of the flocculation of nanosized silica particles (5 nm) with cationic amylopectin has been investigated with stopped-flow technique. The flocculation process has been followed with turbidity. A kinetic mechanism is suggested where the initial process is a bridging flocculation. In ...

The production of paper requires a lot of different raw materials and additives in order to achieve the desired paper properties in a cost-efficient way. Cationic starches are widely used in the wet end process to develop high paper strength and several other additives are also applied to optimi...

Carboxymethylation of amylopectin was accomplished by reacting it with monochloroacetic acid. The results of characterization study confirmed the carboxymethyl functionalization with degree of substitution of 1.25. Carboxymethyl amylopectin was found to be slightly more crystalline, appearing mo...

The effects of electrolyte concentration and pH on the adsorption of cationic amylopectin on microcrystalline cellulose were investigated. The adsorbed amount in the pseudo-plateau of the isotherm showed a maximum as a function of the electrolyte concentration. We compared the data with a recent...

There are burgeoning research interests in designing biocompatible colloidal delivery systems for treating as well as delaying the recurrence of chronic diseases, including various forms of cancers. In this respect, folic acid (FA) esters and starch are particularly interesting owing to (i) the ...

Microflotation experiments and zeta potential measurements of fluorapatite, wavellite, and turquoise with the use of alkyl amines and amylopectin were conducted. The highest floatability values were achieved in the presence of dodecylamine, exceeding the floatabilities with octylamine between 30...

A series of hyperbranched cationic amylopectin derivatives conjugated with 1,2-ethylenediamine, diethylenetriamine and 3-(dimethylamino)-1-propylamine residues, named as EDA-Amp, DETA-Amp and DMAPA-Amp, were synthesized by the N,N’-carbonyldiimidazole activation method at room temperature. Thei...

The presence of γ-carboxamide linkages in poly(γ-glutamylcysteinyl)glycines ((γEC)nG) suggests that these polypeptides are likely to be the products of a biosynthetic pathway. However, the in vivo deamidation of proteins can result in the introduction of γ-carboxamide linkages. Synthetic oli...

Structurally unique conjugated N-hydroxy nitro enamine, namely, 1-amino-1-hydroxyamino-2,2-dinitroethene, has been synthesized by transamination of 1,1-diamino-2,2-dinitro-ethene (FOX-7) with hydroxylamine. The compound is a highly energetic material, its structure being confirmed by X-ray cryst...

A new class of condensing agent, tris (2,4,6-tribromophenoxy) - dichlorophosphorane (BDCP), was applied to the oligodeoxyribonucleotide synthesis. This reagent enabled us to perform a rapid internucleotidic bond formation in the phosphotriester approach only in 1 minute via an active phosphoryln...

Chiral methylpropargyl ester monomers containing amino acid moieties, N-(tert-butoxycarbonyl)-l-alanine (R)-1-methylpropargyl ester (1), N-(benzyloxycarbonyl)-l-valine (R)-1-methylpropargyl ester (2), and N-(tert-butoxycarbonyl)-l-O-cyclohexyl-l-glutamic acid (R)-1-methylpropargyl ester (3) were...

1. The effects of U-54494A and U-50488H on convulsions produced by sound have been studied in genetically epilepsy-prone DBA/2 mice and genetically epilepsy-prone rats.2. Both compounds showed a dose-dependent anticonvulsant activity. U-54494A was less potent as an anticonvulsant than U-50488H i...

The effects of cis-3,4 dichloro-N-2-(l-pyrrolidinyl)cyclo-hexyl-benzamide (U-54494A), an anticonvulsant related to kappa opioids, were studied in vitro on the extracellular electrical activity of the CA1 region of slices of hippocampus in the rat.The effects of U-54494A were compared to those of...

The interactions of tandospirone (formerly called SM-3997) with 5-HT and other neurotransmitter receptor binding sites were determined in brain homogenates. Tandospirone is most potent at the 5-HT1A receptor, displaying a K1 value of 27 ± 5 nM. The agent is approximately two to three orders of ...