Publications

Displaying 1 - 25 of 158

Protocol for structure determination of unknowns by EI mass spectrometry. II. Diagnostic ions in one ring alicyclic, heterocyclic, and aromatic compounds

April 6, 2023

Author(s)

Anzor I. Mikaia

Mass spectra of saturated carbocyclic hydrocarbons containing a single three, four, five, six, seven and more membered ring are discussed followed by the examination of their unsaturated analogs including aromatic hydrocarbons. Mass spectrometry

Protocol for Structure Determination of Unknowns by EI Mass Spectrometry. I. Diagnostic Ions for Acyclic Compounds with up to One Functional Group

September 13, 2022

Author(s)

Anzor I. Mikaia

The review covers wide-ranging electron ionization (EI) dissociation reactions for various acyclic compounds and their derivatives such as alcohols, aldehydes, ketones, carboxylic acids, amines, halides, thiols, thiones, esters, thioesters, amides and more

Unusual Regularity in GC Retention of Simple Amino Acid Derivatives

August 8, 2019

Author(s)

Anzor I. Mikaia, Nino G. Todua, Zenkevich G. Igor

Background. Application of simple regularities and the general principles along with direct use of reference retention index data is a useful approach for reliable structure determination of compounds by GC-MS. Objective. Interpretation of anomaly in

Gas chromatographic-mass spectrometric characterization of thebaol,an opium constituent, and its structural analogs

August 5, 2018

Author(s)

Anzor I. Mikaia, Levan Megutnishvili, Nino G. Todua, Stephen Stein

A GC-MS method is described for the characterization of thebaol, a component of opium poppy. Themethod includes preliminary sample derivatization to TMS, TBDMS, TFA, PFP and HFB substitutedproducts. Fragmentation of resulting derivatives is unique under

Stepwise extraction, chemical modification, GCMS separation,and determination of amino acids in human plasma

March 1, 2018

Author(s)

Nino G. Todua, Johanna Camara, Jacolin A. Murray, Anzor I. Mikaia

A method for isolation of enriched fractions of amino acids from human plasma followed by derivatization, gas chromatography separation and mass spectrometry identification is described. The method involves a stepwise extraction of plasma constituents with

Mass Spectrometry of Analytical Derivatives. 2. Ortho and Para Effects in Electron Ionization Mass Spectra of Derivatives of Hydroxyl, Mercapto and Amino Benzoic Acids

May 1, 2016

Author(s)

Nino G. Todua, Anzor I. Mikaia

Derivatives requiring either anhydrous or aqueous reaction conditions were prepared for robust and reliable gas chromatography mass spectrometry (GC-MS) characterization of hydroxyl, mercapto, and amino benzoic acids. Methylation and trialkylsilylation

Mass spectrometry of analytical derivatives. 1. Cyanide cations in the spectra of N-alkyl-N-perfluoroacyl-alpha-amino acids and their methyl esters

July 15, 2015

Author(s)

Nino G. Todua, Kirill V. Tretyakov, Anzor I. Mikaia

The central mission for the development of the NIST/NIH/EPA mass spectral library (The Library) is the acquisition of reference GC-MS data for important compounds and their chemical modification products 1. Addition of reliable reference data of various

Reductive dimerization and oligomerization of alcohols, ketones, and aldehydes to hydrocarbons on a promoted, fused iron catalyst

July 17, 2014

Author(s)

Anzor I. Mikaia, Leonid S. Glebov, Vladimir G. Zaikin, George A. Kliger

A new reductive dimerization and oligomerization reaction of (C5 and C6) cycloalkanols and cycloalkanones, benzaldehyde, and benzyl alcohol to hydrocarbons containing as many, or more, carbon atoms as the reactant oxygenated compound on a promoted, fused

Electron Ionization Mass Spectra of Alkylated Sulfabenzamides

March 30, 2011

Author(s)

Nino G. Todua, Kirill V. Tretyakov, Roman S. Borisov, Dmitry I. Zhilyaev, Vladimir G. Zaikin, Stephen E. Stein, Anzor I. Mikaia

Mono-, di- and trialkyl derivatives of "sulfabenzamide" (N-4-aminophenylsulfonyl-benzamide) are prepared and their EI mass spectra are examined. It is found that the fragmentation of N- alkylsulfabenzamides (Alkyl = CH3 to n-C5H11) proceeds via a very

Unique para-effect in electron ionization mass spectra of bis(perfluoroacyl) derivatives of bifunctional aminobenzenes

September 15, 2010

Author(s)

Kirill V. Tretyakov, Nino G. Todua, Roman S. Borisov, Vladimir G. Zaikin, Stephen Stein, Anzor I. Mikaia

A new kind of "para-effect" under EI conditions has been discovered for a series of bis(perfluoroacyl) derivatives of o-, m- and p- phenylendiamines, hydroxybenzeneamines and mercaptobenzeneamines of a common structure RCOX C 6H 4 NHCOR (X = NH, S, O; R =

Computer Assisted Expert Evaluation of NIST/NIH/EPA Mass Spectral Library

October 16, 2008

Author(s)

Anzor I. Mikaia, Stephen E. Stein, Vladimir G. Zaikin, D Zhu

The methods used to build a high quality, comprehensive reference library of positive ion EI mass spectra will be discussed. A description of the development of the present system of evaluation will be presented with emphasis on establishing the criteria

Catalysis by homo- and heteronuclear polymetallic systems;palladium giant cluster catalysis; stoichiometric CO2 reduction; reductive dehydration of alcohols

April 28, 2005

Author(s)

Anzor I. Mikaia, II Moiseev, AE Gekhman, Mark Tsodikov, Kugel Kugel, FA Yandieva, Leonid S. Glebov, George A. Kliger, Vladimir G. Zaikin, Yu Maksimov, D Kochubey, V Kriventsov, V Mordovin, JA Navio

Reaction gas chromatography/mass spectrometry. 2the use of catalytic on-line dehydrogenation for the investigation of alcohols by gas chromatography/mass spectrometry

April 7, 2005

Author(s)

Anzor I. Mikaia, Vladimir Smetanin, Vladimir G. Zaikin, Alla V. Antonova, Nikolay A. Prostakov

A GC-MS method is developed for structure determination of aliphatic within mixtures. It involves online application of a gas-phase dehydrogenation reaction after GC separation and before MS analysis. Primary and secondary alcohols are converted into

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