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Journal articles on the topic 'Spectrometric studie'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Leggett, Graham J., John C. Vickerman, David Briggs, and Martin J. Hearn. "Surface studies by static secondary ion mass spectrometry: cluster ion formation studied by tandem mass-spectrometric techniques." Journal of the Chemical Society, Faraday Transactions 88, no. 3 (1992): 297. http://dx.doi.org/10.1039/ft9928800297.

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2

Lyapchenko, Natalya, Rafał Frański, and Grzegorz Schroeder. "Mass Spectrometric Investigation of Protonated and Cationized Molecules of Oxaalkyl Phosphates." European Journal of Mass Spectrometry 8, no. 6 (2002): 451–60. http://dx.doi.org/10.1255/ejms.512.

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Mass spectrometric fragmentation pathways of protonated molecules of oxaalkyl phosphates and their complexes with alkali metal cations are discussed in this paper. Liquid secondary ion mass spectrometry (LSIMS) was used as the ionisation technique and mass spectra from B/E linked scans were registered to elucidate the mass spectrometric decomposition of the studied ions. Mainly loss of the ether molecules H2C=HCOCH3 and HOH2C–H2COCH3 was observed. The elimination of neutrals containing metal, for example, K-CH2CH2OCH3 or KOCH2CH2OCH3 also occurred. In the case of phosphate (III) an unusual los

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3

Kataev, S. S., O. N. Dvorskaya, A. V. Vasilenko, and E. A. Krylova. "Development of conditions for determination of imidazole derivatives in the blood using chromatography-mass spectrometry." Forensic Medical Expertise 68, no. 3 (2025): 32. https://doi.org/10.17116/sudmed20256803132.

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The problem of clonidine, moxonidine, tizanidine determination in forensic studies of biological objects remains due to low therapeutic and toxic concentrations in biological material, that creates certain difficulties in detecting the use of these substances. The study objective is to develop chromato-mass-spectrometry conditions for imidazole derivatives determination in the blood for purposes of forensic chemical and chemical toxicological analysis. The conditions for reliable clonidine, moxonidine, tizanidine identification in the blood using solid-phase extraction and gas chromatography w

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4

Gelb, Michael H., C. Ronald Scott, and Frantisek Turecek. "Newborn Screening for Lysosomal Storage Diseases." Clinical Chemistry 61, no. 2 (2015): 335–46. http://dx.doi.org/10.1373/clinchem.2014.225771.

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Abstract BACKGROUND There is worldwide interest in newborn screening for lysosomal storage diseases because of the development of treatment options that give better results when carried out early in life. Screens with high differentiation between affected and nonaffected individuals are critical because of the large number of potential false positives. CONTENT This review summarizes 3 screening methods: (a) direct assay of enzymatic activities using tandem mass spectrometry or fluorometry, (b) immunocapture-based measurement of lysosomal enzyme abundance, and (c) measurement of biomarkers. Ass

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Martusevich, Andrew, Djaneta Borlakova, Svetlana Krasnova, and Lubov Kozlova. "SPECTROMETRY AS A NEW INSTRUMENTAL METHOD FOR VERIFICATION OFSALIVA CRYSTALLOSCOPIC S." Archiv Euromedica 10, no. 4 (2020): 88–89. http://dx.doi.org/10.35630/2199-885x/2020/10/4.21.

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The aim of the study was to evaluate the spectrometric characteristics of crystalloscopic facies of saliva in practically healthy people. We studied own crystallization of mixed saliva from 65 healthy adults by classic crystalloscopy (with parametric criteria) and spectrometry (at wavelengths of 300, 350 and 400 nm). Based on the study, the standard spectrometric characteristics of dried saliva samples from practically healthy adults were established. The obtained spectrometric patterns of saliva crystalloscopic facies can be used as reference intervals for a wide range of salivadiagnostics ta

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Nedelkov, Dobrin. "Discovering human protein diversity." Macedonian Journal of Chemistry and Chemical Engineering 27, no. 2 (2008): 99. http://dx.doi.org/10.20450/mjcce.2008.229.

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Current emphasis on discovering and correlating human genetic variations lays the foundation for future studies of human protein diversity. Protein posttranslational processing, along with the translation of genetic variations, results in a complex, variable human proteome. Analyzing these protein variations on a grandeur scale has become feasible with the advent of mass spectrometry. Mass spectrometry is the only detection method today that can universally provide information about specific protein structural modifications, without a priori knowledge of the modification. However, high-through

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MIHAI (ȘTIRBESCU), Raluca Maria, and Ion V. POPESCU. "CONTRIBUTIONS TO THE STUDY OF HEAVY METALS POLLUTING FROM THE ENVIRONMENT, BY ATOMIC SPECTROMETRY." Annals of the Academy of Romanian Scientists Series on Physics and Chemistry 8, no. 1 (2023): 115–34. http://dx.doi.org/10.56082/annalsarsciphyschem.2023.1.115.

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"In this scientific work are presented a part of the results included in the thesis entitled "Contributions to the study of heavy polluting elements from the environment by atomic spectrometry" which includes the innovative contributions to the study of the distribution of heavy metals in acacia leaves collected from Dâmbovița county and neighboring counties and the distribution of heavy metals from surface and deep soil collected from the main oil parks in Dâmbovița county. In the analysis of heavy metal concentrations in the studied samples, the spectrometric techniques were used: Atomic Abs

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8

Rodzik, Agnieszka, Paweł Pomastowski, Viorica Railean-Plugaru, Myroslav Sprynskyy та Bogusław Buszewski. "The Study of Zinc Ions Binding to αS1-, β- and κ-Casein". International Journal of Molecular Sciences 21, № 21 (2020): 8096. http://dx.doi.org/10.3390/ijms21218096.

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The presented studies focused on the specificity binding of particular casein fractions: αS1-, β- and κ-casein (αS1CN, βCN, κCN), with zinc ions. The binding mechanism was determined by kinetic modeling using results of batch sorption. For this goal, models of zero-order kinetics, pseudo-first-order, pseudo-second-order and Weber–Morris intraparticle diffusion were used. The formation of Zn-αS1CN, Zn-βCN and Zn-κCN complexes was additionally monitored using spectroscopic methods such as Fourier transform infrared spectroscopy (FT-IR) and Raman spectroscopy, characterizing active functional gro

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9

Ivanova, Bojidarka, and Michael Spiteller. "Physical Properties and Molecular Conformations of Indole Alkaloids and Model Protein Interactions – Theoretical vs. Experimental Study." Natural Product Communications 7, no. 2 (2012): 1934578X1200700. http://dx.doi.org/10.1177/1934578x1200700206.

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The physical properties and molecular structure of five natural indole alkaloids (IAs) and their interaction with protein targets have been studied, experimentally and theoretically. Electronic absorption (EAs) and CD spectroscopy, electrospray ionization (ESI) and matrix-assisted laser desorption/ionization (MALDI) mass spectrometry (MS), as well as imaging mass spectrometric techniques (IMS) were used, analyzing the isolated alkaloids and corresponding IAs/protein molecular complexes. Theoretical quantum chemical DFT calculations were also applied. The mechanism of their biological activity

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10

Subotic, K. M., L. S. Milinkovic, M. T. Zupancic, D. N. Novkovic, and M. S. Stojanovic. "Superconducting Mini-Cyclotrons as AMS Instruments." Radiocarbon 32, no. 1 (1990): 1–6. http://dx.doi.org/10.1017/s0033822200039898.

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We have studied the limitations of conventional mass spectrometry and have examined accelerator based methods which could help circumvent these limitations. In particular, cyclotron-based accelerator mass spectrometric (AMS) techniques are discussed with an emphasis on evaluating performances of superconducting mini-cyclotrons designed for use as AMS instruments. We discussed the design of superconducting mini-cyclotrons dedicated to radioisotope dating research.

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11

Scuderi, D., A. Paladini, M. Satta, et al. "Solvent free interactions in contact pairs of molecules of biological interest: Laser spectroscopic and electrospray mass spectrometric studies." International Journal of Photoenergy 6, no. 1 (2004): 17–21. http://dx.doi.org/10.1155/s1110662x04000030.

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A laser spectroscopic and mass spectrometric study of ionic and molecular clusters of biological interest is reported. The molecules of interest and their aggregates were generated in a supersonic beam and analyzed by mass resolved resonant two photon absorption and ionization (R2PI) and by collision induced mass spectrometry (CID-MS). The absence of the solvent allows to study these systems in the isolated state free of undesired solvent effects which may level off the differences in their properties. The gas phase results have been compared to theoretical estimates of the structure and stabi

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Aleshukina, I., Nagorniy, A. Aleshukina, Ermakova, and Denisenko. "MASS-SPECTROMETRIC STUDIES OF HELMINTHS: INFORMATION TECHNOLOGIES FOR IDENTIFICATION OF PARASITIC INFECTION CAUSES." THEORY AND PRACTICE OF PARASITIC DISEASE CONTROL, no. 23 (April 18, 2022): 38–44. http://dx.doi.org/10.31016/978-5-6046256-9-9.2022.23.38-44.

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Mass spectrometry is currently used to identify bacteria, mycobacteria and some fungi. Unlike clinical bacteriology, MALDI-TOF MS is practically not used for the identification of human and animal parasites. Homogenate protein profiles were obtained using Microflex LT MALDI-TOF MS (Bruker Daltonics Germany) with Flex Control software, visualized using Flex analysis 3.3 software (Bruker Daltonics). Analysis of protein extracts of nematodes showed spectra with high intensity peaks in the range of 2–20 kDa. Slight differences in the mass spectrometric spectra of Ascaris lumbricoides and Ascaris s

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Shagin, Sergey I., Adam M. Pshukov, Aneta A. Kokoeva, and Oksana Z. Blieva. "Study of Radioactivity of Mountain Rivers Waters of the Kabardino-Balkarian Republic Using the NaI Detector in Low-Background Protection." UNIVERSITY NEWS. NORTH-CAUCASIAN REGION. NATURAL SCIENCES SERIES, no. 2 (222) (June 27, 2024): 113–22. http://dx.doi.org/10.18522/1026-2237-2024-2-113-122.

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The results of studies of the radioactivity of the waters of the mountain rivers of the Kabardino-Balkarian Republic using the NaI detector in low-background protection are presented. The paper presents a method of low-background gamma-ray spectrometry for detecting radioactivity in drinking water, which is an effective method, has high sensitivity to radioactive radiation and allows you to accurately determine the level of radioactivity. The MULTIRAD MKS-01A spectrometric installation was used to measure radiation in samples under low background conditions. The identification and calculation

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14

Papsdorf, Monika, and Radosław Pankiewicz. "New Hydrophilic Derivatives of Lasalocid and Their Complexes with Selected Metal Cations." Molecules 28, no. 13 (2023): 5114. http://dx.doi.org/10.3390/molecules28135114.

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Two new esters of lasalocid, that are more hydrophilic, with glucose (LasGlu) and xylitol (LasX), have been synthesized, and their complexation of monovalent cations has been studied by various spectrometric and spectroscopic methods, such as ESI mass spectrometry, 1H, 13C NMR and FT-IR. Analyses of the results confirmed the synthesis of new esters with good yields. In order to carry out further studies, it was necessary to purify them using “flash“ liquid chromatography. It was confirmed that the newly obtained molecules, as well as their complexes with lithium, sodium and potassium cations,

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15

Orlic, Jovana, Mira Anicic-Urosevic, Konstantin Vergel, et al. "Comparison of non-destructive techniques and conventionally used spectrometric techniques for determination of elements in plant samples (coniferous leaves)." Journal of the Serbian Chemical Society 87, no. 1 (2022): 69–81. http://dx.doi.org/10.2298/jsc210921101o.

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Conventionally used spectrometric techniques of inductively coupled plasma optical emission spectrometry (ICP-OES) and inductively coupled plasma optical emission spectrometry (ICP-MS) usually involve time-consuming sample preparation procedure of a sample dissolution which requires the usage of aggressive and toxic chemicals. The need for suitable and sustainable analytical methods for direct multi-elemental analysis of plant samples has been increased in recent years. Spectrometric techniques for direct sample analysis, instrumental neutron activation analysis (INAA) and X-ray fluorescence (

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16

Eltamany, Enas E., Usama Ramadan Abdelmohsen, Dina M. Hal, et al. "Holospiniferoside: A New Antitumor Cerebroside from The Red Sea Cucumber Holothuria spinifera: In Vitro and In Silico Studies." Molecules 26, no. 6 (2021): 1555. http://dx.doi.org/10.3390/molecules26061555.

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Chemical investigation of the methanolic extract of the Red Sea cucumber Holothuria spinifera led to the isolation of a new cerebroside, holospiniferoside (1), together with thymidine (2), methyl-α-d-glucopyranoside (3), a new triacylglycerol (4), and cholesterol (5). Their chemical structures were established by NMR and mass spectrometric analysis, including gas chromatography–mass spectrometry (GC–MS) and high-resolution mass spectrometry (HRMS). All the isolated compounds are reported in this species for the first time. Moreover, compound 1 exhibited promising in vitro antiproliferative eff

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17

Šagátová, Andrea, Nikola Kurucová, Soňa Kotorová, Eva Kováčová, and Bohumír Zaťko. "Influence of base material thickness on spectrometry of semiconductor detectors based on semi-insulating GaAs." EPJ Web of Conferences 288 (2023): 10013. http://dx.doi.org/10.1051/epjconf/202328810013.

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The bulk semi-insulating GaAs material was used for preparation of pad radiation detectors with circular contacts of 1 mm diameter. The spectrometric properties of a semiconductor detector depend on the quality of the base material and on the deposited metallization. Another factor affecting the detector spectrometry is the applied bias controlling the electric collection field. With increasing bias, the charge collection efficiency of particular detector grows. However, this spectrometric property should be changing with detector thickness, which affects the intensity of electric collection f

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18

Hagarová, Ingrid. "Cloud Point Extraction Used for Separation and Preconcentration of Trace Elements in Food Samples: A Review of Recent Applications." Journal of Food Engineering and Technology 10, no. 1 (2021): 1–8. http://dx.doi.org/10.32732/jfet.2021.10.1.1.

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Food safety analysis involves many subfields. One of them is inorganic analysis aimed to the quantification of various trace elements. The main attention in this field is paid to toxic, potentially toxic, and essential trace elements. However in many cases, direct quantification of trace elements in a complex food matrix is almost impossible. To resolve this problem, a combination of a suitable separation procedure with a reliable quantification method is required to deliver accurate results. One of the separation techniques that is currently receiving considerable attention is cloud point ext

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19

Jacobson, N. S. "Mass Spectrometric Studies of Oxides." ECS Transactions 46, no. 1 (2013): 39–53. http://dx.doi.org/10.1149/04601.0039ecst.

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20

Benfenati, Emilio, Rita Frassanito, Nicola Di Toro, et al. "Mass Spectrometric Studies of Flavonoids." Natural Product Letters 4, no. 4 (1994): 247–54. http://dx.doi.org/10.1080/10575639408043914.

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21

Alekseev, Vadim B., Tatyana S. Ulanova, Tatyana V. Nurislamova, Nina A. Popova, and Olga A. Maltseva. "Chromato-mass spectrometric identification of asymmetric dimethylhydrazine and its derivatives in environmental objects and biological media in the population residing near the fall areas of separated rocket vehicles parts." Hygiene and sanitation 99, no. 8 (2020): 773–79. http://dx.doi.org/10.47470/0016-9900-2020-99-8-773-779.

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Introduction. The issue of presence/absence of the consequences of technogenic space and rocket activity over the long period is on the agenda of the professional, social, and political communities, especially in regions were the certain territories have been appointed as the fall areas for the separated rocket vehicles parts, including the Republic of Altai.Aim of study. Identification of the chemical composition of snow samples, drinking water, and blood in the population residing in the fall areas of the separated rocket vehicle parts in the Republic of Altai.Material and methods. Identific

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22

Frański, R., P. Bednarek, D. Siatkowska, P. Wojtaszek, and M. Stobiecki. "Application of mass spectrometry to structural identification of flavonoid monoglycosides isolated from shoot of lupin (Lupinus luteus L.)." Acta Biochimica Polonica 46, no. 2 (1999): 459–73. http://dx.doi.org/10.18388/abp.1999_4177.

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Flavonoid glycosides constitute important group of plant secondary metabolites. This class of natural products play significant role in different physiological processes. A new methodological approach where mass spectrometric techniques are applied to structural studies of this class of compounds is presented. Four flavonoid O-monoglycosides and one C-monoglycoside were isolated from green parts of lupin (Lupinus luteus L.). Several different mass spectrometric techniques were applied to structural elucidation of isolated compounds. Desorption ionization mass spectrometry was used for registra

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23

Dutkiewicz, Ewelina P., and Pawel L. Urban. "Quantitative mass spectrometry of unconventional human biological matrices." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 374, no. 2079 (2016): 20150380. http://dx.doi.org/10.1098/rsta.2015.0380.

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The development of sensitive and versatile mass spectrometric methodology has fuelled interest in the analysis of metabolites and drugs in unconventional biological specimens. Here, we discuss the analysis of eight human matrices—hair, nail, breath, saliva, tears, meibum, nasal mucus and skin excretions (including sweat)—by mass spectrometry (MS). The use of such specimens brings a number of advantages, the most important being non-invasive sampling, the limited risk of adulteration and the ability to obtain information that complements blood and urine tests. The most often studied matrices ar

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Schulten, Hans Rolf, Anna Marzec, and Sylwia Czajkowska. "Mass spectrometric and chemometric studies of thermoplastic properties of coals. 2. Field ionization mass spectrometry of coals." Energy & Fuels 6, no. 1 (1992): 103–8. http://dx.doi.org/10.1021/ef00031a015.

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25

Galbács, Gábor, Tibor Kántor, Luc Moens, and Richard Dams. "Mass spectrometric studies of thermal decomposition products of reference materials for use in solid sampling atomic spectrometry." Spectrochimica Acta Part B: Atomic Spectroscopy 53, no. 9 (1998): 1335–46. http://dx.doi.org/10.1016/s0584-8547(98)00177-3.

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26

Iwabuchi, Haruo, Eiichi Kitazawa, Nobuhiro Kobayashi, Hidetoshi Watanabe, Michiko Kanai, and Kan-Ichi Nakamura. "Studies on drug metabolism using liquid chromatography/mass spectrometry: Comparison of three liquid chromatographic/mass spectrometric interfaces." Biological Mass Spectrometry 23, no. 9 (1994): 540–46. http://dx.doi.org/10.1002/bms.1200230903.

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27

Ivanov, Alexander M., Evgenia V. Kalinina, Nikita B. Strokan, and Alexander A. Lebedev. "4H-SiC Nuclear Radiation p-n Detectors for Operation up to Temperature 375 °C." Materials Science Forum 615-617 (March 2009): 849–52. http://dx.doi.org/10.4028/www.scientific.net/msf.615-617.849.

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The spectrometric characteristics of detectors based on 4H-SiC ﬁlms with ion-doped p+–n junctions in a temperature range from 25 to 375 °C have been studied. The experiments with 5.8-MeV α-particles in a high-temperature chamber were performed. The interference factors of the detectors operation in a mode of spectrometry are established. The energy resolution of 1.35% is received. An increase of the efﬁciency of the diffusion–drift charge transport with increasing temperature has been observed. The last is explained by an increase in the diffusion length of minority carriers.

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28

Avellone, Giuseppe, David Bongiorno, Silvestre Buscemi, et al. "Characterization of Isomeric 1,2,4-Oxadiazolyl-N-Methylpyridinium Salts by Electrospray Ionization Tandem Mass Spectrometry." European Journal of Mass Spectrometry 13, no. 3 (2007): 199–205. http://dx.doi.org/10.1255/ejms.877.

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The mass spectrometric behavior of 1,2,4-oxadiazolyl- N-methylpyridinium salts has been investigated. These substances are of current interest as perspective ionic liquids, compounds used as green solvents for synthesis, and for their catalytic properties. The studies have been developed through electrospray ionization tandem mass spectrometry (ESI-MS/MS) experiments. The obtained results demonstrate a ready distinction between the two isomeric classes, 3- N-methylpyridinium- and 5- N-methylpyridinium-1,2,4-oxadiazoles, is possible through ESI-MS/MS experiments. A deeper investigation on the p

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Gabriele, Caterina, Licia E. Prestagiacomo, Giovanni Cuda, and Marco Gaspari. "Mass Spectrometry-Based Glycoproteomics and Prostate Cancer." International Journal of Molecular Sciences 22, no. 10 (2021): 5222. http://dx.doi.org/10.3390/ijms22105222.

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Aberrant glycosylation has long been known to be associated with cancer, since it is involved in key mechanisms such as tumour onset, development and progression. This review will focus on protein glycosylation studies in cells, tissue, urine and serum in the context of prostate cancer. A dedicated section will cover the glycoforms of prostate specific antigen, the molecule that, despite some important limitations, is routinely tested for helping prostate cancer diagnosis. Our aim is to provide readers with an overview of mass spectrometry-based glycoproteomics of prostate cancer. From this pe

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Fresnais, Margaux, Sevin Turcan, Dirk Theile, et al. "Approaching Sites of Action of Temozolomide for Pharmacological and Clinical Studies in Glioblastoma." Biomedicines 10, no. 1 (2021): 1. http://dx.doi.org/10.3390/biomedicines10010001.

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Temozolomide (TMZ), together with bulk resection and focal radiotherapy, is currently a standard of care for glioblastoma. Absorption, distribution, metabolism, and excretion (ADME) parameters, together with the mode of action of TMZ, make its biochemical and biological action difficult to understand. Accurate understanding of the mode of action of TMZ and the monitoring of TMZ at its anatomical, cellular, and molecular sites of action (SOAs) would greatly benefit precision medicine and the development of novel therapeutic approaches in combination with TMZ. In the present perspective article,

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Shalu, Bharti* Dev Prakash Dahiya Chinu Kumari Palak. "Method Development And Validation Of Propylthiouracil By UV Spectroscopy." International Journal in Pharmaceutical Sciences 2, no. 7 (2024): 248–57. https://doi.org/10.5281/zenodo.12657818.

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Propylthiouracil (PTU) is a vital therapeutic agent utilized in the management of hyperthyroidism. This abstract delineates the systematic method development and validation process employing UV spectrometry for the quantification of PTU, ensuring its efficacy and safety in pharmaceutical formulations and biological samples.1 Validation of the UV spectrometric method encompassed a comprehensive assessment of key parameters such as linearity, accuracy, precision, specificity, and robustness. Calibration curves exhibited excellent linearity over a suitable concentration range, facilitating precis

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Khripach, Vladimir A., Danuše Tarkowská, Vladimir N. Zhabinskii, et al. "Synthesis and Mass Spectral Fragmentation Patterns of Brassinolide Early Biosynthetic Precursors Labeled at C-26." Natural Product Communications 8, no. 6 (2013): 1934578X1300800. http://dx.doi.org/10.1177/1934578x1300800622.

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New analogues of brassinolide biosynthetic precursors with three deuterium atoms at non-exchangeable positions have been synthesized to be used as standards for quantification of natural brassinosteroids by liquid chromatography-mass spectrometry. [26-2H3](22 R,23 R,24 S)-22,23-Dihydroxy-6β-methoxy-24-methyl-3α,5-cyclo-5α-cholestane was used as a starting material for the preparation of campestane derivatives having a 22 R,23 R-diol functionality and either a hydroxy or keto group at C-3 and labeled at C-26. The mass spectrometric behavior of the newly synthesized compounds has been studied.

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Tengö, J., I. Groth, G. Bergström, W. Schröder, S. Krohn, and W. Francke. "Volatile Secretions in Three Species of Dufourea (Hymenoptera: Halictidae) Bees: Chemical Composition and Phylogeny." Zeitschrift für Naturforschung C 40, no. 9-10 (1985): 657–60. http://dx.doi.org/10.1515/znc-1985-9-1011.

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Abstract Volatile secretions from Dufour’s glands in three species of Dufourea bees, Dufourea (Halictoides) dentriventris (Nylander). D.(H.) inermis (Nylander) and D. (Dufourea) minuta Lepelletier have been studied by gas chromatography and mass spectrometry. It was found that the secretions are composed of complex blends of straight chain saturated and unsaturated 2- and 3-ketones and scries of hexanoic and octanoic esters. Cephalic secretions from males and females of D.(H.) inermis and D.(D.) minuta contain sex- and species-specific blends of methylcarbinols and corresponding long chain car

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34

Chikurova, N. Yu, A. V, Gorbovskaia, A. N. Stavrianidi, et al. "Novel Adsorbents for the Determination of Amino Acids in Soil Extracts by Hydrophilic Interaction Liquid Chromatography with Mass Spectrometric Detection." Журнал аналитической химии 78, no. 7 (2023): 637–47. http://dx.doi.org/10.31857/s0044450223070046.

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Adsorbents based on various substrates—silica and a copolymer of styrene with divinylbenzene—are developed for the determination of amino acids by hydrophilic interaction liquid chromatography—mass spectrometry. The optimal version of the structure of the functional layer in two series of the obtained stationary phases was chosen, which provides the best hydrophilization for each substrate. Retention mechanisms were studied and the conditions for the mass-spectrometric detection, separation, and determination of 16 amino acids were chosen. The applicability of the obtained adsorbents and a met

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Roca, María, and Antonio Pérez-Gálvez. "Metabolomics of Chlorophylls and Carotenoids: Analytical Methods and Metabolome-Based Studies." Antioxidants 10, no. 10 (2021): 1622. http://dx.doi.org/10.3390/antiox10101622.

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Chlorophylls and carotenoids are two families of antioxidants present in daily ingested foods, whose recognition as added-value ingredients runs in parallel with the increasing number of demonstrated functional properties. Both groups include a complex and vast number of compounds, and extraction and analysis methods evolved recently to a modern protocol. New methodologies are more potent, precise, and accurate, but their application requires a better understanding of the technical and biological context. Therefore, the present review compiles the basic knowledge and recent advances of the met

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Kotiv, B. N., I. I. Dzidzava, T. N. Suborova, et al. "Comparative analysis of the results of bacteriological and chromato-mass-spectrometric studies of pleural exudate in patients with pleural empyema." Grekov's Bulletin of Surgery 179, no. 3 (2020): 40–47. http://dx.doi.org/10.24884/0042-4625-2020-179-3-40-47.

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The OBJECTIVE was to determine the possibility of using chromatography-mass spectrometry to select causal treatment for patients with pleural empyema.METHODS AND MATERIALS. The analysis of the results of examination and treatment of 207 patients with pleural empyema for the period from 2017 to 2018 was done. All patients underwent bacteriological examination, twenty patients from them underwent chromato-mass-spectrometric examination of pleural exudate.RESULTS. Patients were transferred to a specialized thoracic hospital from other medical institutions, where they received a course of empirica

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ZAEIMAH, Mostafa A. M. "Magnetic and spectrometric studies of Al-Gor area, Southwestern Sinai, Egypt." Contributions to Geophysics and Geodesy 51, no. 3 (2021): 207–23. http://dx.doi.org/10.31577/congeo.2021.51.3.1.

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Al-Gor area is a part of Southwestern Sinai of Egypt. It is considered as one of the most promising areas for mineralization in Egypt, being rich in many mineral deposits of: manganese, iron, copper, zinc, lead, cobalt, nickel, silver, gibbsite, and uranium. Besides, some industrial ore minerals such as kaolin and glass sand,… etc. are also found in this area. The area was studied by Gama-ray spectrometry to trace the radioactive anomalies, their concentrations and their relationship to the existing rocks, and by magnetic survey to study the relationship of radioactive anomalies and their tren

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Pozdnyakov, A. O., and B. M. Ginzburg. "Mass Spectrometric Studies of Polymer Friction." Journal of Macromolecular Science, Part B 52, no. 12 (2013): 1697–706. http://dx.doi.org/10.1080/00222348.2013.808903.

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Buchan, N. I., C. A. Larsen, and G. B. Stringfellow. "Mass spectrometric studies of trimethylindium pyrolysis." Journal of Crystal Growth 92, no. 3-4 (1988): 591–604. http://dx.doi.org/10.1016/0022-0248(88)90044-9.

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Markov, Vitaliy Yu, Victoria E. Aleshina, Andrey Ya Borschevskiy, et al. "Mass spectrometric studies of trifluoromethylated fullerenes." International Journal of Mass Spectrometry 251, no. 1 (2006): 16–22. http://dx.doi.org/10.1016/j.ijms.2005.12.025.

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Hakala, Kati, Jari M. J. Nuutinen, Thomas Straub, Kari Rissanen, and Pirjo Vainiotalo. "Mass spectrometric studies of benzoxazine resorcarenes." Rapid Communications in Mass Spectrometry 16, no. 17 (2002): 1680–85. http://dx.doi.org/10.1002/rcm.770.

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Masuero, Domenico, Domen Škrab, Giulia Chitarrini, et al. "Grape Lipidomics: An Extensive Profiling thorough UHPLC-MS/MS Method." Metabolites 11, no. 12 (2021): 827. http://dx.doi.org/10.3390/metabo11120827.

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Lipids play many essential roles in living organisms, which accounts for the great diversity of these amphiphilic molecules within the individual lipid classes, while their composition depends on intrinsic and extrinsic factors. Recent developments in mass spectrometric methods have significantly contributed to the widespread application of the liquid chromatography-mass spectrometry (LC-MS) approach to the analysis of plant lipids. However, only a few investigators have studied the extensive composition of grape lipids. The present work describes the development of an ultrahigh performance li

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Kurmantayeva, Gulnissa, Alexandr Borisovich Marchenko, Svetlana Aleksandrovna Ivasenko, Rosa Battalovna Seidakhmetova, Marlen Kemelbekovich Smagulov, and Gayane Abdulkhakimovna Atazhanova. "Chemical composition and biological activity of essential oil of Nepeta pannonica." Bulletin of the Karaganda University. “Biology, medicine, geography Series” 104, no. 4 (2021): 46–52. http://dx.doi.org/10.31489/2021bmg4/46-52.

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Search for new sources of biologically active substances from plants of local flora is a promising area of modern phytochemical science. The article examines the composition of essential oil samples obtained from Nepeta pannonica, growing in the Karaganda region with the use of gas-chromatography-mass spectrometry method. The differences in the chemical composition of the oil depending by the plant organs have been identified. The main component of essential oil is nepetalactone. For the analysis, a unified method for determining the component composition of essential oils, as well as an Agile

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Kugler, Florian, Stephan Graneis, Florian C. Stintzing, and Reinhold Carle. "Studies on Betaxanthin Profiles of Vegetables and Fruits from the Chenopodiaceae and Cactaceae." Zeitschrift für Naturforschung C 62, no. 5-6 (2007): 311–18. http://dx.doi.org/10.1515/znc-2007-5-601.

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The present study provides an update on the betaxanthin (bx) compositions of red and yellow beetroots, yellow-coloured Swiss chard petioles, and yellow-orange cactus pear. Applying RP-HPLC coupled with positive ion electrospray mass spectrometry and by comparison with UV-vis and mass spectrometric characteristics as well as retention times of semisynthesized reference compounds, 24 betaxanthins were identified in red and yellow beetroot hypocotyls. Twenty-five and thirteen betaxanthins were present in yellow Swiss chard petioles and the cactus pear cultivar ‘Gialla’, respectively. Ethanolamine

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Simoneit, Otto, Oros, and Kusumoto. "Terpenoids of the Swamp Cypress Subfamily (Taxodioideae), Cupressaceae, an Overview by GC-MS." Molecules 24, no. 17 (2019): 3036. http://dx.doi.org/10.3390/molecules24173036.

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The resins bled from stems and in seed cones and leaves of Cryptomeria japonica, Glyptostrobus pensilis, Taxodium distichum, and T. mucronatum were characterized to provide an overview of their major natural product compositions. The total solvent extract solutions were analyzed as the free and derivatized products by gas chromatography-mass spectrometry to identify the compounds, which comprised minor mono- and sesquiterpenoids, and dominant di- and triterpenoids, plus aliphatic lipids (e.g., n-nonacosan-10-ol). Ferruginol, 7α-p-cymenylferruginol, and chamaecydin were the major characteristic

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Sirikaew, Nutnicha, Dumnoensun Pruksakorn, Parunya Chaiyawat, and Somchai Chutipongtanate. "Mass Spectrometric-Based Proteomics for Biomarker Discovery in Osteosarcoma: Current Status and Future Direction." International Journal of Molecular Sciences 23, no. 17 (2022): 9741. http://dx.doi.org/10.3390/ijms23179741.

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Due to a lack of novel therapies and biomarkers, the clinical outcomes of osteosarcoma patients have not significantly improved for decades. The advancement of mass spectrometry (MS), peptide quantification, and downstream pathway analysis enables the investigation of protein profiles across a wide range of input materials, from cell culture to long-term archived clinical specimens. This can provide insight into osteosarcoma biology and identify candidate biomarkers for diagnosis, prognosis, and stratification of chemotherapy response. In this review, we provide an overview of proteomics studi

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Savoy, L. A., R. M. L. Jones, S. Pochon, et al. "Identification by fast atom bombardment mass spectrometry of insulin fragments produced by insulin proteinase." Biochemical Journal 249, no. 1 (1988): 215–22. http://dx.doi.org/10.1042/bj2490215.

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We describe the isolation by reversed-phase h.p.l.c. of a number of products of the degradation of insulin by insulin proteinase and their direct analysis by fast atom bombardment mass spectrometry (f.a.b.-m.s.). Various semisynthetically labelled insulins were used, including [[2H2]GlyA1]insulin and [18O]LysB29]insulin. The results obtained confirm and extend the results obtained by non-mass-spectrometric methods [Davies, Muir, Rose & Offord (1988) Biochem. J. 249, 209-214, and papers cited therein]. Cleavage sites were identified between positions A13-A14, A14-A15, B9-B10, B13-B14, B24-B

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Chaplin, A. V., A. G. Brzhozovskii, T. V. Parfenova, et al. "Species Diversity of Bifidobacteria in the Intestinal Microbiota Studied Using MALDI-TOF Mass-Spectrometry." Annals of the Russian academy of medical sciences 70, no. 4 (2015): 435–40. http://dx.doi.org/10.15690/vramn.v70.i4.1409.

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Background: The members of genus Bifidobacterium represent a significant part of intestinal microbiota in adults and predominate in infants. Species repertoire of the intestinal bifidobacteria is known to be subjected to major changes with age; however, many details of this process are still to be elucidated.Objective: Our aim was to study the diversity of intestinal bifidobacteria and changes of their qualitative and quantitative composition characteristics during the process of growing up using MALDI-TOF mass-spectrometric analysis of pure bacterial cultures.Methods: A cross-sectional study

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Eryavuz Onmaz, Duygu, Fatma Hümryra Yerlikaya, and Mustafa Onmaz. "Molnupiravir detection by tandem mass spectrometry." Archives of Current Medical Research 5, no. 2 (2024): 66–74. http://dx.doi.org/10.47482/acmr.1397265.

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Background: After the COVID-19 epidemic that broke out in 2019, studies on antiviral drugs accelerated. In clinical studies with both re-purposed drugs and newly discovered drugs, the need for reliable methods that allow the measurement of drug levels in the blood has increased. Molnupiravir is one of the drugs considered under the treatment of COVID-19 and is on the agenda with conflicting findings. However, there are limited validated methods that report the measurement of molnupiravir levels. Therefore, our aim in this study was to develop a practical, robust validated tandem mass spectrome

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Plage, Bernd, and Hans Rolf Schulten. "Thermal degradation and mass-spectrometric fragmentation processes of polyesters studied by time/temperature-resolved pyrolysis-field ionization mass spectrometry." Macromolecules 23, no. 10 (1990): 2642–48. http://dx.doi.org/10.1021/ma00212a008.

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