Výsledky vyhledávání - "Samvel M. Vardapetyan"

TEXTURAL AND CATALYTIC FEATURES OF SILICON SURFACE MODIFIED WITH ZnO IN THE REACTION OF HOMOGENOUS-HETEROGENEOUS ACTIVATION OF PROPANE-OXYGEN MIXTURES AT LOW PRESSURES

Autor: Petros S. Gukasyan, Sevda B. Mkhitaryan, Samvel M. Vardapetyan, Verzhine A. Sarkeziyan, Oleg A. Kamalyan

Publikováno v: Proceedings of the YSU B: Chemical and Biological Sciences. 56:41-48

The textural and catalytic characteristics of the surface of silica gel modified with zinc oxide by the sol-gel method and by means of a chemical transport reaction (CTR) have been studied. It was found that catalytic activity of the obtained contact

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6654dfeb841ca9450b158c3fc29443f2
https://doi.org/10.46991/pysu:b/2022.56.1.041

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DEVELOPMENT OF A RAPID AND EFFICIENT METHOD FOR QUANTITATIVE DETERMINATION OF N-NITROSODIMETHYLAMINE IMPURITY BY HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY IN METFORMIN HYDROCHLORIDE, LOSARTAN POTASSIUM, VALSARTAN AND RANITIDINE MEDICINAL RAW MATERIALS AND ITS PRODUCTS

Autor: Virab G. Kirakosyan, Samvel M. Vardapetyan, Lusine H. Varderesyan, Avetis H. Tsaturyan

Publikováno v: Proceedings of the YSU B: Chemical and Biological Sciences. 55:296-299

In this study, chromatographic conditions were developed for the separation and quantification of N-nitrosodimethylamine (NDMA) by HPLC. Our method would be useful for the rapid screening and quantification of NDMA impurity in Metformin hydrochloride

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2340cdc13219dfb8f74f9bb31790bfdd
https://doi.org/10.46991/pysu:b/2021.55.3.296

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QUANTITATIVE DETERMINATION OF TANNIN IN NETTLE BY SPECTROPHOTOMETRIC AND CHROMATOGRAPHIC METHODS

Autor: Samvel M. Vardapetyan, Anahit M. Hovhannisyan, Svetlana H. Apoyan, Gohar F. Mkrtchyan

Publikováno v: Proceedings of the YSU B: Chemical and Biological Sciences. 55:12-15

The amount of tannins in the leaves of stinging nettle was determined depending on the phenological phase (budding phase, mass flowering phase and fruiting phase). UV spectrophotometric and high performance liquid chromatographic (HPLC) methods were

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::066c8c11ddd95237ea84a9423265352e
https://doi.org/10.46991/pysu:b/2021.55.1.012

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NEW POSSIBILITIES OF LOW-TEMPERATURE GENERATION OF ACTIVE CENTERS DURING HETEROGENEOUS-HOMOGENEOUS ACTIVATION OF PROPANE ON SILICA GEL SURFACE, MODIFIED WITH ZnO BY THE SOL-GEL AND CHEICAL TRANSPORT REACTION METHODS

Autor: Tatevik O. Kamalyan, Petros S. Gukasyan, Oleg A. Kamalyan, Samvel M. Vardapetyan

Publikováno v: Proceedings of the YSU B: Chemical and Biological Sciences. 55:1-6

By the example of heterogeneous catalytic oxidation of propane the process of peroxide radicals transfer from the surface of catalysts into the reactor volume is studied. For comparison ZnO/SiO2 contacts obtained by depositing the active phase on the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a5255f394b607b1411c246535a33d810
https://doi.org/10.46991/pysu:b/2021.55.1.001

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