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Search Publications by: Anzor I. Mikaia (Fed)

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Displaying 1 - 25 of 79

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

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

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

Reaction gas chromatography/mass spectrometry. 2—the 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

Fundamentals of Mass Spectrometry

December 1, 2001
Author(s)
Vladimir G. Zaikin, Alexey V. Varlamov, Anzor I. Mikaia, Nikolay A. Prostakov
This tutorial book explains principles of mass spectrometry (such as ionization of molecules, fragmentation of ions, separation of ions, construction of mass spectrometers) and methods of ionization (electron impact, chemical, electrospray, fast atom

Fundamentals of Mass Spectrometry of Organic Compounds

January 1, 2001
Author(s)
Anzor I. Mikaia, Vladimir G. Zaikin, Alexey V. Varlamov, Nikolay A. Prostakov
The book is about mass spectrometry, design of instruments, theoretical aspects and methodological approaches, includes exercises. Portions of the book developed from lecture and laboratory material used presenting a course in organic mass spectrometry at

The Critical Evaluation of a Comprehensive Mass Spectral Library

August 1, 1999
Author(s)
P Ausloos, C L. Clifton, S G. Lias, Anzor I. Mikaia, Stephen Stein, Dmitrii Tchekhovskoi, O D. Sparkman, Vladimir G. Zaikin, D Zhu
A description of the methods used to build a high quality, comprehensive reference library of electron-ionization mass spectra is presented. Emphasis is placed on the most challenging part of this project the improvement of quality by expert evaluation

The critical evaluation of a comprehensive mass spectral library

March 15, 1999
Author(s)
C L. Clifton, S G. Lias, Anzor I. Mikaia, Stephen Stein, Dmitrii Tchekhovskoi, O D. Sparkman, Vladimir G. Zaikin, Damo Zhu
A description of methods used to build a high quality, comprehensive reference library of EI mass spectra is presented

Quality Control Procedures for the NIST/EPA/NIH Mass Spectral Library

May 31, 1998
Author(s)
C L. Clifton, S G. Lias, Anzor I. Mikaia, O D. Sparkman, Stephen Stein, Dmitrii Tchekhovskoi, Damo Zhu, Vladimir G. Zaikin
The goal of quality control procedures is to produce the best possible spectra for library searching. The role of a panel of data evaluators is presented, and the plans for further improvements of the NIST/EPA/NIH mass spectral library is presented.

The NIST/EPA/NIH mass spectral database: simultaneous control of quality and quantity

June 1, 1997
Author(s)
S G. Lias, Anzor I. Mikaia, O D. Sparkman, Stephen Stein, Vladimir G. Zaikin
Achievements in the development of the NIST/EPA/NIH mass spectral library is reported. Statistical data on the content of the library is presented,the quality control procedures are described, the roles of computer methods and manual procedures in data

New Silyl Derivatives for the Determination of Alcohols by GC/MS

May 12, 1996
Author(s)
Vladimir G. Zaikin, Michael Y. Shmatko, Anzor I. Mikaia
1-Methyl-1-silacyclobutyl, 1-Methyl-1-silacyclopentyl, pentamethyldisilaethyl and pentamethyl-1,3- disilapropyl derivatives for alcohols are obtained, and characteristic peaks in their mass spectra are revealed. The use of specific silyl derivatives for

The evaluation of a comprehensive MS reference library

May 21, 1995
Author(s)
Vladimir G. Zaikin, C L. Clifton, S G. Lias, Anzor I. Mikaia, Stephen Stein, O D. Sparkman
Step-by-step procedures of spectra evaluation in the NIST/NIH/EPA mass spectral library is presented. The criteria for data inclusion to the library are discussed. Detailed analysis of manual evaluation factors are given.

Problems and progress in the measurement of reference mass spectra

May 29, 1994
Author(s)
C L. Clifton, Anzor I. Mikaia, Stephen Stein
Compounds of interest and their availability as well as purity of the samples in the market are discussed. Difficulties in acquiring samples of common chemicals are noted. Sample preparation procedures for GC-MS analysis along with the instrumental