Measurments with combination pH electrodes of the pH of the dilute buffers used in a commercial kit (CEA-Roche) for assay of carcinoembryonic antigen resulted in pH values 0.1 to 0.3 unit lower than pH values measured on an electrode system with a capillary junction. If the pH values of these buffers were adjusted, based on such measurements, an error in the assay of 0.2 to 0.6 ng/ml in the 1.5...

BACKGROUND Azaheterocycles are an important class of compounds because of their highly potent medicinal activities, and the imidazole subcategory is of special interest in regard to drug discovery research. FINDINGS An expeditious synthetic protocol of 2-aryl-4-phenyl-1H-imidazoles has been accomplished by reacting phenylglyoxal monohydrate, ammonium acetate, and aldehyde under sonication. Fo...

Cadmium sulphide (CdS) thin films were deposited onto glass substrates by chemical bath deposition (CBD) from a bath containing cadmium acetate, ammonium acetate, thiourea and ammonium hydroxide. The CdS films were annealed in air at various temperatures (350, 400 and 450 °C) for 60 minutes, and times (5, 15, 30, 45 and 60 minutes) at constant temperature (400 °C) in order to investigate the in...

Differences in charge state distributions of hairpin versus linear strands of oligonucleotides are analyzed using electrospray ionization mass spectrometry (ESI-MS) in the negative ion detection mode. It is observed that the linear structures show lower charge state distribution than the hairpin strands of the same composition. The concentration of ammonium acetate and the cone voltage are majo...

To establish a method for determination of glycyrrhizic and glycyrrhetinic acids in Weiyanning Granule. The contents of glycyrrhizic and glycyrrhetinic acids are determined by HPLC under conditions as follows: Diamonsil C18 (4.6 mm × 250 mm, 5 μm) column, mobile phase of acetonitrile-0.05 mol/L ammonium acetate solution (A: 0.05 mol/L ammonium acetate solution; B: acetonitrile, gradient elution...

Positive-ion thermospray liquid chromatography-mass spectrometry (TSP-LC-MS) is used to detect organic acids via the direct injection of untreated urine from newborns and infants. Two methods are reported for the separation of organic acids. The separation of urinary organic acids is effected in either an acidic, pH 2.5 sulfuric acid, or a non-acidic, 0.05 M ammonium acetate, pH 6.8, mobile pha...

An efficient, simple, and green four-component reaction for synthesizing 1,2,4,5-tetrasubstituted imidazoles is developed. In present work exploring the use of Samarium triflate as a heterogeneous catalyst aldehydes, aromatic amines, benzil, ammonium acetate. The current approach offers many advantages, such excellent yields, shortening time, reusability catalyst, mild conditions.

In the structure of the title hydrated salt, NH4 (+)·C8H5Cl2O3 (-)·0.5H2O, where the anion derives from (3,5-di-chloro-phen-oxy)acetic acid, the ammonium cation is involved in extensive N-H⋯O hydrogen bonding with both carboxyl-ate and ether O-atom acceptors giving sheet structures lying parallel to (100). The water mol-ecule of solvation lies on a crystallographic twofold rotation axis and is ...

A novel biocomposite material was developed by immobilizing an ammonia-oxidizing bacterial strain, Acinetobacter calcoaceticus STB1, on an electrospun porous cellulose acetate (CA) nanofibrous web. Ammonium removal characteristics of the STB1 immobilized CA nanofibrous web were determined at varying initial ammonium concentrations, and removal rates of 100%, 98.5% and 72% were observed within 4...

3,5-Bis(trifluoromethyl) phenyl ammonium triflate(BFPAT) catalyzed one-pot synthesis of indeno[1,2-b]pyridine compound derivatives by four-component condensation aldehyde, aromatic ketones, 1,3-indanedione, and acetate in ethanol. Accessible starting materials, Simplicity operation, green practical catalyst, easy purification, excellent yields are the key benefits current technique.