Chemiluminescence flow Sensor for determination of the Ammonium ion

Anunoniaisasignificantalkalinepollutantintheatmosphere.AInInoniaeInittedintothetroposphereisreadilytraPpedbyacidicclouddropletSanditneutralizestheacidityofthedropletStoformammoniumsaltS.Therefore,thedetendnationoftheanunoniumioninwetdepositionisveryimportantinatmosphericchemistry,andthereisaneedforasimPleandrapidmethodforthedetendnationofNfu .Variousdetectionmethodsandtechniquesareusedfordetendninganunoniaorammoniumion,suchasionchromatography',ion-selectiveeIectrode',BLMselectrochendcalse…     

Flow-injection Chemiluminescence Determination of Catecholamines

Catecholaminesarenowwidelyusedinthetreatmentofbronchialasthma,hypertension,heartfailureassociatedwithorganicheartdiseases,andcardiacsurgery'.Thedeterminationofcatacholaminesinpharmaceuticalpreparationshasappearedespeciallyattractive.Chemiluminescence(CL)hasbeenexploitedinanumberofanalyticalapplicationsowingtoitsgreatsensitivity.SomeCLreactionshavenotfoundmanyapplicationsduetotheinstabilityofoxidationreagentssuchashypochlorite.WeproposedthatunstablereagentsrequiredforCLreactioncanbegenerated…     

The synthesis of ω-thienylalkane acids from ω-chloroalkane acids

Summary We have worked out a preparative method for the synthesis of -thienylalkane acids by acylation of thiophene with -chloroalkane acid chlorides followed by conversion of the resulting -chloroalkyl(2-thienyl)ketones into the corresponding acids by reaction with sodium malonic ester or potassium cyanide, and reduction of the resulting products with their simultaneous hydrolysis.Here and later we mean -(2-thienyl)alkne acids.We take this opportunity to thank R. Kh. Freidlina, A. A. Beér, and M. A. Besprozvannii for giving us enough -chloroalkane acids.     

Flow Injection Chemiluminescence Analysis of Low Level Concentration of Hydrazine

IntroductionHydrazine is often used as high-energy propellant in space shuttle program, and it is an important precursor in polymer industry, pesticides, and pharmaceuticals1,2. However, owing to its intensive mammalian toxicity, the monitoring of hydrazine residues in environment matrices has become a priority field in industrial laboratories. Siontorou et al.3,4 and Marrazza et al.5 recently designed a kind of DNA biosensor for monitoring pollutant including hydrazine. Some electrochemical…     

Flow‐Injection Chemiluminescence Analysis of Cloperastione Hydrochloride

Abstract

A new chemiluminescence (CL) reaction was observed when cloperastine hydrochloride was injected into the reaction mixture after the CL reaction of Ce(IV) and sodium sulfite finished. A new flow injection CL method for the determination of cloperastine hydrochloride was established based on the CL reaction. The relative standard deviation (RSD) for the determination of cloperastine hydrochloride was 1.3% (n=11, c=1.0×10^?6 g/mL). The CL intensity responded linearly to the concentration of cloperastine hydrochloride in the range 2.0×10^?7～2.0×10^?5 g/mL (r=0.9962). The detection limit was 5×10^?8 g/mL cloperastine hydrochloride. The method had been applied to the determination of cloperastine hydrochloride in tablets with satisfactory results.     

Reaction of ω-Vinyloxyalkylamines with Isatin

3-(-Vinyloxyalkylimino)-2,3-dihydroindol-2-ones and 3-(vinyloxyphenylimino)-2,3-dihydroindol-2-ones were synthesized in 34-93% yield by reactions of -aminoalkyl and aminophenyl vinyl ethers with isatin.     

Microwave-assisted synthesis of dialkyl ω-azidoalkylphosphonates

An efficient and reproducible microwave-assisted synthesis of dialkyl ω-azidoalkylphosphonates via nucleophilic substitution of the appropriate dialkyl ω-bromoalkylphosphonates by sodium azide in water or dimethylformamide (DMF) as solvent has been developed. This process has been optimized for batch reactors. The target, structurally diverse dialkyl ω-azidoalkylphosphonates with different steric hindrance around the phosphonato groups and containing unbranched side carbon chains of different lengths (n?=?2–6), has been obtained in moderate to high yields (39–87%).     

Flow-injection Chemiluminescence Determination of Trace Calf Thymus DNA

A flow injection procedure for the determination of calf thymus DMA (CT DNA) over the range 2.1x10-6~2.1x10-1 B.g mL-1 is described, based on measurement of the enhanced chemiluminescence emission of rhodamine B-Ce(IV) system, activated by imidazole-HCl buffer solution. This method is highly sensitive, with the linearity range broadened to five orders of magnitude. It has been applied to determine CT DNA in synthetic sample with satisfactory results.     

Superacidic cyclization of ω-hydroxygeraniol diacetate and ω-hydroxygeraniol benzyl ether acetate

Low-temperature superacidic cyclization of (E,E)-3,7-dimethylocta-2,6-diene-1,8-diol (ω-hydroxygeraniol) diacetate and (E,E)-8-acetoxy-1-benzyloxy-3,7-dimethylocta-2,6-diene leads to the same mixtures of two diastereomeric 9-acetoxy-8-hydroxy-p-menth-1-enes epimeric at the C(8) atom. Translated fromIzvestiya Akademii Nauk Seriya Khimicheskaya, No. 1, pp. 135–138, January, 1999.     

Solid Phase Extraction Chemiluminescence Determination of Methamidaphos on Vegetables

IntroductionDuring recent years,organophosphorus pesticides(OPPs)have been widely used in agriculture becauseof their low environmental persistence and high effec-tiveness.However,they have a high acute toxicity.Trace amounts of OPPs may remain in foodstu…     

Energetics of intramolecular hydrogen bonds and conformations of ω-diphenylphosphoryl- and ω-diphenylthiophosphoryl-substituted aliphatic alcohol molecules

A series of conformationally heterogeneous and energetically multilevel -diphenylphosphoryl- and -diphenylthiophosphoryl-substituted aliphatic alcohols, whose molecules are capable of five-, six-, and seven-membered ring closure due to the OH...O=P or OH...S=P intramolecular hydrogen bond (IHB), was studied by IR spectroscopy and molecular mechanics. The data obtained confirm the previous assumption that the energy of IHB (E _IHB) differs substantially from the difference of enthalpies of conformers with and without IHB (–H ), which is experimentally determined by the temperature dependence of the intensity of IR (OH) absorption bands. The measured –H values can be positive, zero, or negative at significant IHB effects, i.e., at high (OH) and E _IHB values.     

Flow Injection Analysis of Histidine with Enhanced Electrogenerated Chemiluminescence of Luminol

Histidine is one of the necessary basic amino acids in biological bases, which often controls the catalytic activity of enzymes and acts in holding the higher structure of proteins. Furthermore, it is also an important ingredient in pharmaceutical preparations used for treatment of hetpatosis and nephropathy. Therefore, the determination of histidine in biological fluids and pharmaceutical preparations is of great importance. Various methods have been proposed for the detection of histidine …     

General method of synthesizing esters of ω-nitropolyenic acids

Summary A general method has been developed for the synthesis of esters of polyenic -nitro acids.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya No. 11, pp. 2093–2095, November, 1964     

Structure determination of glycopeptide of β-momorcharin

The structure of the N-linked oligosaccharide chain of β-momorcharin, a ribosome-inactivating protein from the seeds of Momordica charantia Linn (Cucurbitaceae), was determined. A glycopeptide liberated by pronase digestion of the glycoprotein was subjected to amino acid and neutral carbohydrate analysis to establish the composition of amino acid and sugar residues. The sequences and glycosylation hnkages of the sugar and amino acid residues in the glycopeptide were determined as Manαl-6(XyIβ1-2)-Manβ1-4GlcNAcβ1-4(Fucαl-3)-GlcNAc-Asn-Leu by 2D-NMR spectroscopy and FAB-MS data.     

Reactions of Triphenylphospine with ω-Bromoalkanecarboxylic Acids

Russian Journal of General Chemistry - Phosphonium salts and their corresponding phosphabetaines—ω-phosphonioalkanoates—with a large number of methylene units were obtained on the...