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Artykuły w czasopismach na temat „Chromatographic Conditions”

Autor: Grafiati

Data publikacji: 3 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Zhang, Jing, and Hongye Zhang. "Research progress on the detection of water-soluble vitamins in food using liquid chromatography." Theoretical and Natural Science 37, no. 1 (2024): 158–69. http://dx.doi.org/10.54254/2753-8818/37/20240183.

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Currently, liquid chromatography is widely used for the analysis and determination of water-soluble vitamins (WSVs) in functional foods. However, due to the diversity of sample characteristics and the requirement for purification accuracy, the chromatographic conditions and specific methods used vary. This paper reviews the chromatographic conditions of liquid chromatography techniques for detecting WSVs in food, as well as the selection of liquid chromatography methods in different application fields. The chromatographic conditions include chromatographic columns, column temperature, mobile p

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Ostapiv, R. D., and V. І. Tkachenko. "OPTIMIZATION OF LIQUID CHROMATOGRAPHIC CONDITIONS TO SEPARATE WATER-SOLUBLE VITAMINS." Scientific and Technical Bulletin оf State Scientific Research Control Institute of Veterinary Medical Products and Fodder Additives аnd Institute of Animal Biology 21, no. 1 (2020): 141–46. http://dx.doi.org/10.36359/scivp.2020-21-1.18.

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Vitamins are widely used in veterinary medicine, in particular, as components of premixes, feeds and feed additives to increase the productivity of farm animals. Most of these feed additives are a complex amino acid and vitamin mixtures (of ten active substances or more) based on the matrix of plant or animal origin, which can be enriched with protein. When the analyst is faced with the difficult task of analyzing such a mixture, it is usually necessary to use several variants of the HPLC method (high-performance liquid chromatography), which increases the time and cost of analysis of the prem

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3

Mahn, Andrea, M. Elena Lienqueo, and Juan A. Asenjo. "A Simple Method for the Estimation of Protein Retention in Hydrophobic Interaction Chromatography Under Different Operation Conditions." Open Biotechnology Journal 1, no. 1 (2007): 9–13. http://dx.doi.org/10.2174/1874070700701010009.

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Protein behavior in Hydrophobic Interaction Chromatography using different chromatographic conditions was investigated. A linear correlation was found between protein retention time on different matrixes and different initial elution salt concentrations. Mathematical correlations between retention times under different chromatographic conditions were obtained and validated, which can be used in process design and scale-up.

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4

Melikhova, Elena V., and Olga V. Farafonova. "Optimization of the Conditions for Determining 2,4-D and Deltamethrin by HPLC." Izvestiya of Saratov University. New Series. Series: Chemistry. Biology. Ecology 20, no. 4 (2020): 372–77. http://dx.doi.org/10.18500/1816-9775-2020-20-4-372-377.

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The paper presents the results of optimizing the conditions for the chromatographic determination of 2,4-dichlorophenoxyacetic acid and deltamethrin for two capillary columns (Supelcosil LC-18, Kromasil C-18). The modes of individual chromatography of pesticides were selected. The use of the isocratic elution mode in the joint presence of 2,4-dichlorophenoxyacetic acid and deltamethrin was shown and experimentally proved to be invalid. Three options were proposed for the conditions of the gradient mode of the separate detection of analytes in a mixture. The developed technique for the chromato

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5

Kholin, Andrey Yu, Svetlana V. Kurbatova, and Margarita N. Zemtsova. "Comparative analysis of the various structures quinoline derivatives retention under RP HPLC." Butlerov Communications 63, no. 8 (2020): 31–39. http://dx.doi.org/10.37952/roi-jbc-01/20-63-8-31.

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The study results of the structure and physicochemical parameters effect of various quinoline derivatives on their retention under conditions of reversed-phase high-performance liquid chromatography are presented. It is shown that since the establishment of the relationship between the structure of a substance and its properties is still one of the most important problems of modern chemistry and materials science, chromatography is a very convenient and effective method for obtaining the information necessary for this. To establish the relationship between the structure and sorption characteri

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6

Korshun, M. M., O. M. Korshun, A. O. Lipavska, T. I. Zinchenko, S. V. Bilous, and A. O. Аvramchuk. "OPTIMIZATION OF PESTICIDES RESIDUES ANALYTICAL CONTROL IN CEREAL CROPS PROTECTION SYSTEM." Medical Science of Ukraine (MSU) 15, no. 3-4 (2019): 76–84. http://dx.doi.org/10.32345/2664-4738.3-4.2019.12.

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Relevance. The scientific substantiation of the method selection, the development of conditions for qualitative identification and quantitative determination of Axial 050 EC, Peak 75 WG, Tilt 250 EC, Magnello 350 EC, Enzhio 247 SS, Karate Zeon 050 CC pesticides (by its simultaneous presence) used in cereal crops protection system was given in the article, as well as preparation conditions for the analysis of water and air samples were described, which will allow to control the established hygienic standards and minimize pesticide negative impact on population health and the environment.

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7

Jampilek, Josef, Malgorzata Dolowy, and Alina Pyka-Pajak. "Estimating Limits of Detection and Quantification of Ibuprofen by TLC-Densitometry at Different Chromatographic Conditions." Processes 8, no. 8 (2020): 919. http://dx.doi.org/10.3390/pr8080919.

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Ibuprofen is one of the best-known nonsteroidal anti-inflammatory and analgesic drugs. Following the previous work, the current study is focused on estimating the effect of different chromatographic conditions on the sensitivity of thin-layer chromatography in combination with UV densitometry, i.e., the detection and quantification of ibuprofen in a wide range of its concentrations including the lowest limits of detection (LOD) and quantification (LOQ). For this purpose, a reliable and easy-to-use calculation procedure for LOD and LOQ determination is presented in this work. In addition, the i

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8

Melikhova, E. V., and V. Yu Solovyova. "Gas Chromatographic Determination of Residual Concentrations of a Mixture of Organochlorine Pesticides in Food Products." Proceedings of the Southwest State University. Series: Engineering and Technology 13, no. 4 (2024): 163–73. http://dx.doi.org/10.21869/2223-1528-2023-13-4-163-173.

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Purpose of research. The aim of the work is to optimize the conditions for gas chromatographic determination of a mixture of eight organochlorine pesticides: aldrin, hexachlorobenzene, heptachlor, α-hexachlorocyclohexane, γ-hexachlorocyclohexane, dichlorodiphenyltrichloromethylmethane, dichlorodiphenyldichloroethane and dichlorodiphenyldichloroethylene.Methods. For chromatographic studies of organochlorine pesticides we used a Shimadzu GC-2010Plus gas chromatograph (Shimadzu, Japan) equipped with an automatic equilibrium vapor sample dispenser NT200N, electron-capture detector based on 63Ni an

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9

Vzduleva, Nadezhda O., and Valery B. Gitlin. "Optimization of the time the chromatograph thermostats exit to a given temperature." Izmeritel`naya Tekhnika, no. 6 (2020): 40–45. http://dx.doi.org/10.32446/0368-1025it.2020-6-40-45.

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The problems of ensuring the stability of the temperature of the chromatographic experiment carried out using a serial gas chromatograph LGH-3000 are considered. Limiting the permissible heating rate of the chromatograph thermostats does not allow a quick transition to the new conditions of the chromatographic experiment in accordance with the requirements of the technical conditions. The processes of heating and cooling the thermostat are analyzed. It is shown that the ratio of the duration of the interval equal to the sum of the durations of the heating and cooling intervals to the duration

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10

Romanyuk, Anna A., and Dmitry V. Moiseev. "Determination of the optimal conditions for the extraction of anthraglycosides of alder buckthorn bark, development and validation of a method for their quantitative determination by high performance liquid chromatography." Человек и его здоровье 25, no. 4 (2022): 118–27. http://dx.doi.org/10.21626/vestnik/2022-4/15.

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Objective: optimization of extraction conditions for anthraglycosides of alder buckthorn bark, development and validation of a method for their quantitative determination using high performance liquid chromatography. Materials and methods. The object of the study was alder buckthorn bark from different manufacturers. The work was performed on an Agilent 1100 liquid chromatograph complete with a G1311A four-solvent supply and degassing system, a G1315B diode array detector, a G1316A column thermostat, and a G1313A automatic sample injection device. Chromatographic analysis was carried out on a

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11

Vaškevičius, Mantas, Jurgita Kapočiūtė-Dzikienė, and Liudas Šlepikas. "Prediction of Chromatography Conditions for Purification in Organic Synthesis Using Deep Learning." Molecules 26, no. 9 (2021): 2474. http://dx.doi.org/10.3390/molecules26092474.

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In this research, a process for developing normal-phase liquid chromatography solvent systems has been proposed. In contrast to the development of conditions via thin-layer chromatography (TLC), this process is based on the architecture of two hierarchically connected neural network-based components. Using a large database of reaction procedures allows those two components to perform an essential role in the machine-learning-based prediction of chromatographic purification conditions, i.e., solvents and the ratio between solvents. In our paper, we build two datasets and test various molecular

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12

Saha, Sourav, Sandip Mallik, Bikash Debnath, Waikhom Somraj Singh, Abu Md Ashif Ikbal, and Kuntal Manna. "Application of HPLC in Biomedical Research for Pesticide and Drug Analysis." Global Journal of Medical, Pharmaceutical, and Biomedical Update 18 (September 7, 2023): 20. http://dx.doi.org/10.25259/gjmpbu_40_2023.

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Compared to traditional liquid chromatography, high-performance liquid chromatography (HPLC) delivers better results for analyzing unknown compounds. It permits faster resolution time, better peak shapes, repeatable responses, and greater precision. A comprehensive literature search has been conducted using online academic databases such as Google Scholar, PubMed, Web of Science, and Scopus, using keywords such as HPLC, pesticide analysis, drugs analysis, chromatographic conditions, and HPLC Column type. Total 75 number of articles were collected from peer-reviewed journals. With the help of l

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13

Cong, Jing Xiang, Shao Yan Wang, Xiu Hong Wu, and Ping Yu. "Optimization of Separation Conditions of Liquiritin in Preparative Liquid Chromatography." Advanced Materials Research 550-553 (July 2012): 1647–52. http://dx.doi.org/10.4028/www.scientific.net/amr.550-553.1647.

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The aim of this work was to study the separation conditions of Liquiritin (LQ) in preparative liquid chromatography. Based on the inverse method, the adsorption isotherm parameters of LQ and the closely impurities were determined. Then the chromatographic conditions were optimized by combination of orthogonal design experiments and numerical simulation. The optimum injection concentration, injection purity of LQ and injection volume was found as 50 g/L, 45 % and 5 mL, respectively. The parameters of simulated moving bed chromatography were selected and the separation process was analysis. This

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14

Liu, Xing Rong, Jian Zheng, Dao Chen Zhu, and Yuan Mei Chen. "Determination of Puerarin and Daidzin from Pueraria Root Based on Chromatography." Advanced Materials Research 524-527 (May 2012): 2273–77. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.2273.

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Combine thin layer chromatography ( TLC ) with high performance liquid chromatography ( HPLC ) detection of kudzu root isoflavones, to establish a rapid and accurate method to determine the component content of Puerarin and daidzin in Radix Puerariae.Though study on the optimization analysis of Puerarin Content in Radix Puerariae and daidzin content chromatography in a variety of conditions, including TLC developing solvent and options of coloration, and HPLC chromatographic separation conditions and detection characteristics of TLC and HPL, to get the best Chromatographic separation condition

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15

Yatsenko, Larisa Anatolyevna, Maria Yurevna Printseva, Ilya Danilovich Cheshko, and Artur Alexandrovich Tumanovsky. "Detection of residues and determination of the composition of combustible components in case of explosions of vapor-gas-air mixtures." Technology of technosphere safety 97 (2022): 51–60. http://dx.doi.org/10.25257/tts.2022.3.97.51-60.

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Introduction. Liquefied hydrocarbon gases (LHG) are widely used in various fields. The main components of LHG are: propane, isobutane and n-butane, which are not only combustible, but also explosive gases capable of detonation combustion. The detection of LHG in the air is a very urgent task in expert studies. To determine the component composition of various flammable liquids, for the purpose of their identification, chromatographs equipped with a capillary quartz column with a phase that allows detecting saturated hydrocarbons of the homologous series from pentane to pentatetracontane inclus

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16

Rodrigues, Clóvis A., Ana E. Oliveira, Ana F. Schürmann da Silva, et al. "A Comparative Study of Stationary Phase for Separation of Biflavonoids from Rheedia gardneriana Using Column Chromatography." Zeitschrift für Naturforschung C 55, no. 7-8 (2000): 524–27. http://dx.doi.org/10.1515/znc-2000-7-808.

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Abstract This paper describes a comparative study by using different chromatographic supports (silica gel, chitin and chitosan) to separate biflavonoids from Rheedia gardneriana by column chromatography. The results indicated that chitin can be used as alternative method, but the yield of the compounds is lower than when silica gel is employed. In contrast, chitosan is not a good chromatographic support for the separation of the biflavonoids under the same experimental conditions.

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17

Cherniakova, Valeriia, Artem Myhal, Vitalii Rudiuk, et al. "Determination of chromatographic conditions for quantitative assessment of active components in complex nasal spray after manufacturing and expiry date." ScienceRise: Pharmaceutical Science, no. 1(47) (February 29, 2024): 30–39. http://dx.doi.org/10.15587/2519-4852.2024.299184.

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The aim of the work is the development of chromatographic conditions, the study of the validation characteristics of the method of quantitative determination of phenylephrine hydrochloride, nitrofural, lidocaine hydrochloride and diphenhydramine hydrochloride, panthenol, povidone in the joint presence in the nasal spray by a complex method of liquid chromatography with UV detection. Evaluation of the quantitative content of active components after manufacturing and during the shelf life. Materials and methods. Agilent 1260 liquid chromatographs, equipped with a diode-matrix detector from

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18

KRUGER, J. E., and B. A. MARCHYLO. "SELECTION OF COLUMN AND OPERATING CONDITIONS FOR REVERSED-PHASE HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY OF PROTEINS IN CANADIAN WHEAT." Canadian Journal of Plant Science 65, no. 2 (1985): 285–98. http://dx.doi.org/10.4141/cjps85-041.

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Chromatographic conditions were optimized and three commercially available columns were evaluated for separation of alcohol-soluble storage proteins of Neepawa wheat using reversed-phase high-performance liquid chromatography (RP-HPLC). Optimal separation was achieved using an extracting solution of 50% 1-propanol, 1% acetic acid, and 4% dithiothreitol and an HPLC elution time of 105 min at a flow rate of 1.0 mL/min. HPLC columns evaluated (SynChropak RP-P, Ultrapore RPSC and Aquapore RP-300) varied in selectivity and resolution. The column providing the greatest versatility was Aquapore RP-30

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Boysen, R. I., and M. T. W. Hearn. "Chromatographic Conditions for the Preparative Separation of Peptides." Cold Spring Harbor Protocols 2006, no. 27 (2006): pdb.ip4. http://dx.doi.org/10.1101/pdb.ip4.

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Carr, C. David, and Robert L. Moritz. "Standard Chromatographic Conditions for RP-HPLC of Proteins." Cold Spring Harbor Protocols 2006, no. 1 (2006): pdb.prot4200. http://dx.doi.org/10.1101/pdb.prot4200.

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Siu, Sun Chau, Rihab Boushaba, Jonathan Liau, Rolf Hjorth, and Nigel J. Titchener-Hooker. "Confocal imaging of chromatographic fouling under flow conditions." Journal of Chemical Technology & Biotechnology 82, no. 10 (2007): 871–81. http://dx.doi.org/10.1002/jctb.1728.

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Migliorini, Cristiano, Marco Mazzotti, Gianmarco Zenoni, MariaPia Pedeferri, and Massimo Morbidelli. "Modeling chromatographic chiral separations under nonlinear competitive conditions." AIChE Journal 46, no. 8 (2000): 1530–40. http://dx.doi.org/10.1002/aic.690460806.

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Saad, Martin N., Hebatallah M. Essam, Eman S. Elzanfaly, and Sawsan M. Amer. "A Two-Step Optimization Approach: Validated RP-HPLC Method for Determination of Gatifloxacin and Dexamethasone in Ophthalmic Formulation." Journal of Chromatographic Science 58, no. 6 (2020): 504–10. http://dx.doi.org/10.1093/chromsci/bmaa013.

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Abstract The growing technology of stationary phase chemistry has a great impact on the chromatographic system performance and analysis economics. In this context, a simple rapid reversed phase high-performance liquid chromatography method development is presented for the analysis of gatifloxacin (GFN) and dexamethasone sodium phosphate (DSP) in their ophthalmic formulation. A two-step optimization approach has been conducted using optimum chromatographic conditions as well as proper selection of stationary phase. The chromatographic separation was carried out using sodium phosphate buffer pH

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24

Kuleshova, S. I., E. P. Simonova, and O. N. Vysochanskaya. "Determination of Vancomycin B and Vancomycin Impurities by Liquid Chromatography." Bulletin of the Scientific Centre for Expert Evaluation of Medicinal Products 11, no. 4 (2021): 246–54. http://dx.doi.org/10.30895/1991-2919-2021-11-4-246-254.

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The preferred test methods for control of product-related impurities in medicinal products are high-performance liquid chromatography (HPLC) with a fine sorbent, and ultra-performance liquid chromatography (UPLC), which allow for better chromatographic separation of active substances and related impurities, reduction of time costs, and saving of material resources. The aim of the study was to develop HPLC and UPLC test procedures and assess the chromatographic separation capacity and efficiency in order to improve determination of the main vancomycin component and related impurities. Materials

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Omelchuk, Sergii T., Alina I. Syrota, and Anna V. Blagaia. "THE NEED FOR IMPROVEMENT OF FUNGICIDES RESIDUAL QUANTITIES CONTROL METHODS IN THE CONDITIONS OF THE DOMESTIC REGULATORY BASE HARMONIZATION." Wiadomości Lekarskie 75, no. 10 (2022): 2455–61. http://dx.doi.org/10.36740/wlek202210126.

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The aim: To develop highly sensitive analytical methods for the determination of the systemic phenylamide class fungicide – Metalaxyl-M residues in watermelons and grapes to reduce the risk of hazardous effects on workers’ and public health. Materials and methods: Conditions for Metalaxyl-M detection by gas-liquid chromatography (GLC) using a chromatographic capillary column SH-Rxi-5ms (length – 30 m, inner diameter – 0.25 mm, layer thickness – 0.25 μm) were determined. The optimal conditions for chromatography of Metalaxyl-M were established: column thermostat temperature – 220°С, evaporator

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Kalyani, Ashok Patil*1 Shailesh B. Patil2. "To Develop And Validate Stability Indicating Assay Of Diloxanide Furoate By Using UV And HPLC And HPTLC Method For Pharmaceutical Dosage Form." International Journal in Pharmaceutical Sciences 2, no. 6 (2024): 498–517. https://doi.org/10.5281/zenodo.11543189.

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The study aimed to establish stability assays for Diloxanide Furoate using both High-Performance Liquid Chromatography (HPLC) and High-Performance Thin-Layer Chromatography (HPTLC) methods, covering crucial aspects of method development and validation. Detailed specifications were provided for the HPLC and HPTLC systems to ensure proper setup and functioning. Chromatographic conditions were optimized, including parameters like stationary phase, mobile phase composition, flow rate, and detection wavelength, to achieve optimal separation and detection of Diloxanide Furoate. The identity of pure

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Larin, A. V. "Criterion for the Quantitative Assessment of Ideal Conditions in Chromatography." Adsorption Science & Technology 6, no. 4 (1989): 212–18. http://dx.doi.org/10.1177/026361748900600404.

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The quantitative relationship between the plate theory variant model of equilibrium adsorption in which time is the only independent variable and the theory of ideal chromatogaphy has been evaluated. It has been shown that an approach to ideal conditions depends directly on an increase in the relative (or absolute) length of the column. Practical recommendations on the choice and assessment of conditions to verify the measurement of adsorption isotherms and on the calculation of chromatographic processes in accordance with the theory of ideal chromatography are given.

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Suzuki, Yuya, Jianlin Han, Osamu Kitagawa, José Luis Aceña, Karel D. Klika, and Vadim A. Soloshonok. "A comprehensive examination of the self-disproportionation of enantiomers (SDE) of chiral amides via achiral, laboratory-routine, gravity-driven column chromatography." RSC Advances 5, no. 4 (2015): 2988–93. http://dx.doi.org/10.1039/c4ra13928c.

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The behavior of a series of chiral amides during column chromatography using an achiral stationary phase revealed that a self-disproportionation of enantiomers (SDE) was always observed regardless of amide structure or chromatographic conditions.

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Panchenko, T., and L. Cherviakova. "Improvement of analytical determination of cyproconazole and propiconazole in fruit crops." Interdepartmental Thematic Scientific Collection of Plant Protection and Quarantine, no. 68 (April 20, 2023): 208–15. http://dx.doi.org/10.36495/1606-9773.2022.68.208-215.

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Goal. Development and unification of the method of simultaneous determination of cyproconazole and propiconazole in fruits (apples, peaches, grapes) by gas-liquid chromatography (GC). Methods. The active substances were determined by gas-liquid chromatography (GC) using a gas chromatograph «Perkin Elmer 8410» with an NPD detector. Propiconazole and cyproconazole were identified by the retention time of the compounds, quantification by the calibration dependence of the chromatographic peak area of the analyte on its concentration in the calibration solution by correlation and regression a

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S., Mohan, Srinivasarao N., and Lakshmi K. "Development and Validation of a Stability indicating Related Substances of Baricitinib by RP-HPLC and its Degradation." International Journal of Management and Humanities (IJMH) 4, no. 2 (2019): 4–9. https://doi.org/10.35940/ijmh.A0369.104219.

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Reverse phase high performance liquid chromatography method, for estimation of related substances or chromatographic impurities of Barcitinib was developed and validated. Baricitinib was developed by separating its degradation products on a X-Terra RP18 (150x4.6mm, 5.0 µm) column using 0.1% Tri ethyl amine in water adjusted pH-2.5 with OPA and Acetonitrile in simple gradient at a flow rate 1.0 ml/min. The column effluents were monitored by a photodiode array detector set at 224nm. The method was validated in terms of specificity, linearity, accuracy, precision, detection limit, quantific

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Wanat, Karolina, Grażyna Żydek, Adam Hekner, and Elżbieta Brzezińska. "In Silico Plasma Protein Binding Studies of Selected Group of Drugs Using TLC and HPLC Retention Data." Pharmaceuticals 14, no. 3 (2021): 202. http://dx.doi.org/10.3390/ph14030202.

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Plasma protein binding is an important determinant of the pharmacokinetic properties of chemical compounds in living organisms. The aim of the present study was to determine the index of protein binding affinity based on chromatographic experiments. The question is which chromatographic environment will best mimic the drug–protein binding conditions. Retention data from normal phase thin-layer liquid chromatography (NP TLC), reversed phase (RP) TLC and HPLC chromatography experiments with 129 active pharmaceutical ingredients (APIs) were collected. The stationary phase of the TLC plates was mo

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Kordzakhia, T. N., M. G. Zautashvili, L. G. Eprikashvili, et al. "New sorbents for determining the quality of alcoholic beverages by chromatographic analysis." Himia, Fizika ta Tehnologia Poverhni 15, no. 4 (2024): 500–506. http://dx.doi.org/10.15407/hftp15.04.500.

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A new universal gas-chromatographic method of identification of toxic impurities is proposed in order to improve the quality indicators of alcoholic beverages. Application of chromatographic methods in wine making is characterized by some peculiarities, which is stipulated from one hand by substance characteristics as they are and from the other by changes in chromatographic methods possibilities. The method allows to determine the quality and chemical composition of the alcoholic beverages, which to some extent determines the possibility of regulating its quality on a scientific basis. Modifi

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Apostolov, Suzana, and Gyöngyi Vastag. "Chromatographic parameters as tools for predicting the biological activity of azo derivatives." Macedonian Journal of Chemistry and Chemical Engineering 40, no. 1 (2021): 29. http://dx.doi.org/10.20450/mjcce.2021.2045.

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Preliminary assessment of the bioactive profile of azo derivatives was performed applying drug-likeness rules. As the presumed criteria of lipophilicity chromatographic parameters (RM0, m and C0) were calculated in mixtures water/ methanol and water/ acetonitrile by using reversed phase thin-layer chromatography (RPTLC C18/ UV254s). The relationships between chromatographic parameters and relevant software parameters of biological activity of azo derivatives were examined by linear regression and by two multivariate methods. Good linear relationships for each applied system were obtained. The

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Duy Hung, Nguyen, A. V. Taneva, and V. F. Novikov. "Determination of the antioxidant additive “Ionol” in transformer oil by gas chromatographic method." E3S Web of Conferences 288 (2021): 01081. http://dx.doi.org/10.1051/e3sconf/202128801081.

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Transformer oil is widely used in power oil-filled electrical equipment, which is an insulating and diagnostic medium. During the operation of power transformers, its operational and dielectric properties deteriorate. To increase the operating time of transformer oil, it is inhibited by an antioxidant additive, which is most often used as ionol and the ionol concentration must be constantly monitored. This control is carried out by chromatographic methods. The main problem of controlling the antioxidant additive in transformer oil is its extraction with organic extractants, which are ethyl alc

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Orlenko, Dmytro, Volodymyr Yakovenko, Vyacheslav Plastun, and Liliia Vyshnevska. "DEVELOPMENT AND VALIDATION OF METHODS FOR QUANTITATIVE DETERMINATION OF SODIUM HYALURONATE IN THE COMPOSITION OF COMBINED DENTAL GEL." EUREKA: Health Sciences 5 (September 30, 2020): 72–81. http://dx.doi.org/10.21303/2504-5679.2020.001420.

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According to the EP monograph "Sodium hyaluronate" for identification they use the infrared transmission spectrum of the substance, quantification is carried out by spectrophotometry. The aim of the work was to develop a method for quantitative determination of hyaluronic acid in the gel in the presence of other substances and its validation. Materials and Methods. The object of the study were samples of combined dental gel of the following composition: metronidazole benzoate 16 mg/g, miramistin 5 mg / g, sodium hyaluronate 2 mg / g. Identification and quantification of sodium hyaluronate was

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Matsuda, Rieko, Yuzuru Hayashi, Mumio Ishibashi, and Yasushi Takeda. "Optimization of a Liquid Chromatographic Method Based on Information Theory: Application of the Method to Dissolution Testing." Journal of AOAC INTERNATIONAL 77, no. 2 (1994): 338–43. http://dx.doi.org/10.1093/jaoac/77.2.338.

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Abstract The simultaneous optimization of mobile phase composition, column length, detection wavelength, and flow rate was applied to the development of an assay method for dissolution testing of multi-ingredient formulations. This optimization procedure is called Total Chromatographic Optimization and is based on the information theory of chromatography. Optimal chromatographic conditions resulted in very rapid and precise measurements. The dissolution test procedures, including sampling, dilution, filtering, and assay, were performed automatically by a laboratory robotic system. The dissolut

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Wang, Xiayan, Jianzheng Kang, Shili Wang, Joann J. Lu, and Shaorong Liu. "Chromatographic separations in a nanocapillary under pressure-driven conditions." Journal of Chromatography A 1200, no. 2 (2008): 108–13. http://dx.doi.org/10.1016/j.chroma.2008.05.088.

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Zhimulev, E. I., V. M. Sonin, A. I. Chepurov, and A. A. Tomilenko. "Chromatographic study of formation conditions of rhombododecahedral diamond crystals." Geology of Ore Deposits 51, no. 3 (2009): 243–46. http://dx.doi.org/10.1134/s1075701509030064.

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Boysen, R. I., and M. T. W. Hearn. "Chromatographic Conditions for the Desalting of Peptides and Proteins." Cold Spring Harbor Protocols 2006, no. 27 (2006): pdb.ip6. http://dx.doi.org/10.1101/pdb.ip6.

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Matusch, Rudolf, and Carsten Coors. "Chromatographic Separation of the Excess Enantiomer under Achiral Conditions." Angewandte Chemie International Edition in English 28, no. 5 (1989): 626–27. http://dx.doi.org/10.1002/anie.198906261.

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Petrovska-Dimitrievska, Gabriela, Jelena Acevska, Natalija Nakov, Marija Zafirova Gjorgievska, and Katerina Brezovska. "Impact of mobile phase composition on reverse-phase separation of polar basic compounds." Macedonian Pharmaceutical Bulletin 68, no. 1 (2023): 69–74. http://dx.doi.org/10.33320/maced.pharm.bull.2022.68.01.008.

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Method development for determination of polar basic compounds on ion-suppression reverse-phase liquid chromatography, requires appropriate selection of stationary phase and composition and pH value of the mobile phase. The addition of the organic solvent in aqueous buffers with defined pH value, results in shift of the pH value of the mobile phase, resulting in significant change in chromatographic retention and selectivity. The aim of this study was to evaluate the impact of the variation of pH value of the mobile phase and percentage of the organic solvent, on the chromatographic separation

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Dembek, Mikołaj, and Szymon Bocian. "Stationary Phases for Green Liquid Chromatography." Materials 15, no. 2 (2022): 419. http://dx.doi.org/10.3390/ma15020419.

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Industrial research, including pharmaceutical research, is increasingly using liquid chromatography techniques. This involves the production of large quantities of hazardous and toxic organic waste. Therefore, it is essential at this point to focus interest on solutions proposed by so-called “green chemistry”. One such solution is the search for new methods or the use of new materials that will reduce waste. One of the most promising ideas is to perform chromatographic separation using pure water, without organic solvents, as a mobile phase. Such an approach requires novel stationary phases or

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Al Bakain, Ramia Z., Yahya Al-Degs, Bertyl Andri, Didier Thiébaut, Jérôme Vial, and Isabelle Rivals. "Supercritical Fluid Chromatography of Drugs: Parallel Factor Analysis for Column Testing in a Wide Range of Operational Conditions." Journal of Analytical Methods in Chemistry 2017 (2017): 1–13. http://dx.doi.org/10.1155/2017/5340601.

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Retention mechanisms involved in supercritical fluid chromatography (SFC) are influenced by interdependent parameters (temperature, pressure, chemistry of the mobile phase, and nature of the stationary phase), a complexity which makes the selection of a proper stationary phase for a given separation a challenging step. For the first time in SFC studies, Parallel Factor Analysis (PARAFAC) was employed to evaluate the chromatographic behavior of eight different stationary phases in a wide range of chromatographic conditions (temperature, pressure, and gradient elution composition). Design of Exp

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Pietrusiewicz, K. Michał, Mariusz Borkowski, Dorota Strzelecka, et al. "A General Phenomenon of Spontaneous Amplification of Optical Purity under Achiral Chromatographic Conditions." Symmetry 11, no. 5 (2019): 680. http://dx.doi.org/10.3390/sym11050680.

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This work explores the behavior of chiral compound mixtures enriched in one of the enantiomers whilst a typical chromatography on the achiral stationary phase is employed. The influence of several factors, such as the eluent composition, ratio of the compound to the stationary phase, and the initial enatiomeric purity of the compound used on the distribution of the enantiomers in the collected chromatographic fraction, was studied. The obtained results indicate that the phenomenon of Self Disproportionation of Enantiomer (SDE) occurred in all cases, and some of the collected fractions got high

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Kosman, V. M., M. V. Karlina, and O. N. Pozharitskaya. "Effect of Sample Preparation and Chromatographic Conditions on Background Signal." Bulletin of the Scientific Centre for Expert Evaluation of Medicinal Products 10, no. 2 (2020): 121–28. http://dx.doi.org/10.30895/1991-2919-2020-10-2-121-128.

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The HPLC-UV method is widely used for quantitative analysis of drug substances found in biological samples obtained in pharmacokinetics studies, bioequivalence studies, or during therapeutic drug monitoring. The main limitation is associated with a significant background effect of biological matrixes, limiting the sensitivity of HPLC-UV methods.The aim of the study was to evaluate sample preparation and chromatographic conditions in terms of background signal level during HPLC-UV analysis of blood plasma.Material and methods: three types of blood plasma (rat, rabbit and human), three chromatog

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Dar, Bilal Ahmad, Mushtaq Ahmad Qurishi, and Aijaz Hussain Kanth. "Studies on structural elucidation of delphinium alkaloids by using LC-ESI-MS technique." JOURNAL OF ADVANCES IN CHEMISTRY 11, no. 3 (2015): 3399–411. http://dx.doi.org/10.24297/jac.v11i3.868.

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A rapid,sensitive and specific liquid chromatography-electron spray-mass spectrometry (LC-ESI-MS) method to identify the different diester-diterpenoid and monoester type alkaloids from delphinium cashmerianum Collected from Sopi Kargil. Chromatographic separation were achieved on c-18 coloumn and peaks determined by mass spectrometry in positive and negative modes.The validated method led to tentative identification of eight alkaloids on the basis of their retention times and fragmentation patterns. Results showed that the positive mode response was much higher than the negative ion mode .chro

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Hamza, Ouakouak, Ben Mohamed Moktar, Ben Chohra Mostafa, and Abdelhamid Zeghdaoui. "Phenobarbital Analysis in Biological Matrix (Blood) by High Performance Liquid Chromatography (HPLC)." International Letters of Chemistry, Physics and Astronomy 20 (October 2013): 31–40. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.20.31.

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In this work, we have tried to contribute to the analysis of phenobarbital in the blood. To do this, we used different analytical techniques such as liquid chromatography (HPLC). The results obtained in the course of our work, we can conclude that: The HPLC method was separate phenobarbital endogenous blood components, and optimizing the conditions of chromatographic separation as the composition of the mobile phase consisting of 20% acetonitrile + 20% methanol + 60% ammonium acetate buffer. The extraction with diethyl ether to pH = 4; The chromatographic column, microbondapack ZORBAX C18. A s

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Hamza, Ouakouak, Ben Mohamed Moktar, Ben Chohra Mostafa, and Abdelhamid Zeghdaoui. "Phenobarbital Analysis in Biological Matrix (Blood) by High Performance Liquid Chromatography (HPLC)." International Letters of Chemistry, Physics and Astronomy 20 (October 16, 2013): 31–40. http://dx.doi.org/10.56431/p-6t05wn.

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In this work, we have tried to contribute to the analysis of phenobarbital in the blood. To do this, we used different analytical techniques such as liquid chromatography (HPLC). The results obtained in the course of our work, we can conclude that: The HPLC method was separate phenobarbital endogenous blood components, and optimizing the conditions of chromatographic separation as the composition of the mobile phase consisting of 20% acetonitrile + 20% methanol + 60% ammonium acetate buffer. The extraction with diethyl ether to pH = 4; The chromatographic column, microbondapack ZORBAX C18. A s

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Nakov, Natalija, Jelena Acevska, Katerina Brezovska, Rumenka Petkovska, and Aneta Dimitrovska. "Optimization of hydrophilic interaction liquid chromatographic method for simultaneous determination of cetylpyridinium chloride and benzocaine in lozenges." Macedonian Journal of Chemistry and Chemical Engineering 31, no. 1 (2012): 47. http://dx.doi.org/10.20450/mjcce.2012.56.

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A new Hydrophilic Interaction Liquid Chromatography (HILIC) method was developed for simultaneous determination of cetylpyridinium chloride and benzocaine as active substances in lozenges. Method development included investigation of the influence of the critical chromatographic conditions such as: type of organic modifier, mobile phase strength, ionic strength and pH value of the buffer used in the mobile phase, as well as experimental determination of dominant mechanism of retention. The optimal chromatographic conditions were obtained using bare silica column and a mobile phase consisting o

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Gehrke, Charles W., Kenneth C. Kuo, Floyd E. Kaiser та Robert W. Zumwalt. "Analysis of Amino Acids by Gas Chromatography as the N-Trifluoroacetyl η-Butyl Esters". Journal of AOAC INTERNATIONAL 70, № 1 (1987): 160–70. http://dx.doi.org/10.1093/jaoac/70.1.160.

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Abstract This presentation describes amino acid analysis with the gas chromatographic method and experimental conditions using the N-trifluoroacetyl n-butyl ester derivatives; the study we describe here was undertaken to compare gas chromatographic (GC) and ion-exchange chromatographic (IEC) analyses of amino acids in hydrolysates of 9 diverse sample types to gain insight into effects of these 2 chromatographic methods of analysis on variation in amino acid results. Our study showed that values for samples prepared by 2 separate laboratories using the same procedure were generally in good agre

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