A new mechanism-based glucosidase inactivator, conduritol aziridine (1,2-dideoxy-1,2-epimino-myo-inositol), has been synthesised from myo-inositol. This aziridine inactivates both the β-glucosidase from Alcaligenes faecalis and the α-glucosidase from yeast according to the expected pseudo-firs...

Cyclin G-associated kinase (GAK) is a cellular regulator of the clathrin-associated host adaptor proteins AP-1 and AP-2, which regulates intracellular trafficking of dengue virus during early and late stages of the viral lifecycle. Previously, the discovery of isothiazolo[4,3-b]pyridines as pote...

A simple and efficient protocol has been demonstrated for the preparation of densely functionalized 3-aroylimidazo[1,2-a]pyridines from 2-aminopyridines and chalcones using RuCl3·H2O/I2 catalytic system. The advantages, such as low catalyst loading, broad substrate scope with respect to substit...

Previously, we identified a class of salicylic acid derivatives that display inhibitory activity against the protein tyrosine phosphatase YopH from Yersinia pestis. Because docking study suggested that the large phenyl ring attaching to the salicylic acid core might be exposed to the solvent and...

Laccase from Trametes versicolor was immobilized on Amberlite IR-120 H beads. Maximum immobilization obtained was 78.7% at pH = 4.5 and temperature T = 45 °C. Kinetic parameters, Km and Vmax values, were determined respectively as 0.051 mM and 2.77 × 10−2 mM/s for free and 4.70 mM and 5.27 × ...

α-Amylase from mung beans (Vigna radiata) was immobilized on two different matrices, Amberlite MB 150 and chitosan beads. Maximum immobilization obtained was 72% and 69% in case of Amberlite and chitosan beads, respectively. The pH optima of soluble α-amylase were 5.6, whereas that for immobil...

Cicer α-galactosidase was immobilized onto chitosan and Amberlite with immobilization efficiency of 62% and 51%, respectively. Compared to soluble enzyme, immobilized enzyme had a broader operational pH range and thermal stability. Temperature optimum for chitosan immobilized enzyme and Amberli...

α-Amylase from soybeans was immobilized on two different matrices, Chitosan beads and Amberlite MB-150. Maximum immobilization of 62% and 70.4% was obtained with Chitosan and Amberlite MB-150, respectively. The optimum pH obtained was 8.0 and 7.0 for the α-amylase immobilized on Chitosan beads...

The adsorption properties of a novel gel-type weak acid resin (110-H) for Pb2+ were investigated using chemical methods and IR spectrometry. The optimal adsorption condition of 110-H for Pb2+ is at pH=6.49 in HAc-NaAc medium and the statically saturated adsorption capacity is 485 mg/g at 298 K. ...

This study identified an appropriate engineering model which described the exchange kinetics of sodium ions with a strong acid cation resin. Synthetic resins have potential application for the demineralization of coal seam (CS) water prior to beneficial reuse. However, there is limited data rega...

The present work deals with the study of adsorption of isonicotinic acid (iNA) onto Amberlite IR120 H. Equilibrium and kinetic experiments are carried out to determine the effect of adsorbent dose (10 g/L to 70 g/L) initial concentration of iNA (0.01 M to 0.05 M), contact time (0 to 40 min) and ...

p-Diethylphosphonomethylthiacalix[6]arene (1) was impregnated on Amberlite XAD-7 resin (1-XAD), and the sorption kinetics of 1-XAD towards Pd(II) ions in HCl media were investigated. The maximum Pd(II) sorption capacity (SC) of 1-XAD was 18.7 mg g− 1 after a contact time of 24 h in a 200 mg L− 1...

In this paper, the process of boron removal from water with fractions of Amberlite IRA743 resin of different particle sizes of 1–45, 150–180 and 500–700 μm was studied over a boron concentration range of 1.5–15.0 mg/L. The effect of the resin dosage, particle size, contact time between the ...

Adsorption of U(VI) from Egyptian crude phosphoric acid was studied using the modified Amberlite XAD-2 resin. Modification process was performed by soaking Amberlite XAD-2 resin in tri-butyl phosphate (TBP) and di-2-ethyl hexyl phosphoric acid (D2EHPA) for increasing its adsorption capacity via ...

A new chelating resin, 2-mercaptobenzothiazole loaded Amberlite XAD-1180 was prepared and used for separation and preconcentration of Cd(II) and Pb(II) ions prior to their determinations by flame atomic absorption spectrometry. The optimum pH for simultaneous retention of the elements and the be...

Palladium-bismuth nanoparticles were supported into strongly basic anion-exchange resin of gel-type and tested as catalysts for the selective oxidation of glycerol with molecular oxygen at atmospheric pressure. Detailed study of the precursors preparation and reduction were undertaken. The catal...

Anion exchange resins have been widely used to effectively remove hexavalent chromium (Cr(VI)) from Cr(VI)-containing wastewater. However, Cr(VI) is a powerful oxidizing agent that is capable of oxidizing almost all organic materials under acidic conditions, resulting that it is possible for Cr(...

Recovery of monosaccharides from hydrolysates of biomass wastes can bring environmental and economic benefits. This study aimed to explore the feasibility to separate major monosaccharides from hydrolysates of lignocellulosic biomass, i.e. glucose, xylose and arabinose by using column chromatogr...

Aqueous solutions of polyethylenimines (PEI) are usually used in the manufacture process of paper from pulps to improve the physical strength, and the ink and coatings fixation and to facilitate the printing. When PEI is used as a liquid cationic flocculant in water treatment it is supplied as a...

A one-pot Amberlite IRA-400 Cl resin catalyzed the in-situ generation of imines from various aldehydes and primary amines followed by reduction with sodium borohydride affording corresponding secondary amines. The secondary amines thus obtained were utilized for the IRA-400 Cl resin catalyzed mu...