Ion-exclusion chromatography (IEC) has been widely used in the separation of carboxylic acids, finding applications in the analysis of food and beverages, pharmaceuticals, biological samples, and acid rain samples.1 The retention mechanism of carboxylic acids in ion-exclusion chromatography has also been investigated in many studies, and the factors which affect retention can be divided into th...

Flow calorimetry, which is ideally suited for measuring reactions oc­ curring at the liquid/solid interface, has been used to study the surface chemistry of many types of solids, but little use of it has been made in the study of surface reactions of soils. The purpose of this study was to demonstrate the application of flow calorimetry to the study of two fun­ damental soil chemical processes,...

The lecithins of rat liver are resolved into three fractions by chromatography on a thin layer of silica gel impregnated with silver nitrate. Each of these fractions is placed in a small column containing a cation-exchange resin, and the lecithins are eluted free from silver nitrate. Recoveries average 96%.

A new aminoglycoside antibiotic, G-367 S1 (2'-N-formylsisomicin, C20H37N5O8) produced by a rare actinomycetes, Dactylosporangium thailandense G-367 (FERM-P 4840) has been isolated by column chromatography on a cation-exchange resin. G-367 S1 is active against Gram-positive and Gram-negative bacteria.

In this work, simultaneous isolation of lactoferrin (Lf) and lactoperoxidase (Lp) from defatted bovine colostrum by one-step cation exchange chromatography with SPEC 70 SLS ion-exchange resin was investigated. A RP-HPLC method for Lf and Lp determination was developed and optimized as the following conditions: detection wavelength of 220 nm, flow rate of 1 mL/min and acetonitrile concentration ...

A detailed procedure for the quantitative determination of metanephrine and normetanephrine is given. Epinephrine and norepinephrine are eliminated by selective adsorption on an alumina column. Metanephrine and normetanephrine are isolated with a cation-exchange resin. Fluorescence is developed by a two-step ferricyanide oxidation at two different pH values followed by tautomerization. The conc...

HE INTRODUCTION OF the carboxylic acid cation exchange Amberlite XE-96 (or IRC-50) Azure A resin’ as the medium for hydrogen ion exchange in place of the quininium exchange resin has simplified greatly the determination of gastric acidity without intubation (1). Solvent extraction and fluorimetry are no longer required. The amount of blue dye excreted in the urine is readily measured by visual ...

Microbial reverse electrodialysis cells (MRECs) combine power generation from salinity gradient energy using reverse electrodialysis (RED), with power generation from organic matter using a microbial fuel cell. Waste heat can be used to distill ammonium bicarbonate into high (HC) and low salt concentration (LC) solutions for use in the RED stack, but nitrogen crossover into the anode chamber mu...

AIM To establish the staining characteristics of certain ion exchange resins in histological material, with a view to enabling confident differential identification. METHODS Various histological staining procedures were applied to selected pathological material and prepared agar blocks containing the cation exchange resin calcium polystyrene sulphonate and the anion exchange resin cholestyram...

Heterogeneous catalysis and their application in industrial-scale organic synthesis of fine chemicals are greatly facilitated by catalysis and further on by catalyst recovery and recycles to fits most “principles of green chemistry. In acid media, terpenoids generally undergoes various transformations. The terpenoid transformations include various liquid Bronsted and Lewis Acids, Acid clays, He...