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Journal articles on the topic 'Spectrophotometric characteristics'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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1

Ismail, M. I. "Physical characteristics and polarographic reduction mechanism of some oxazolones." Canadian Journal of Chemistry 69, no. 12 (1991): 1886–92. http://dx.doi.org/10.1139/v91-273.

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The redox potential (ΔE1/2), electron affinity (EA), ionization potential (IP), coulomb repulsion integral (J12), and electronic transition energy (ECT) of several oxazolone derivatives in DMF were computed. A linear correlation was shown to exist between ΔE1/2 and ECT• The polarographic reduction was investigated in ethanolic-Theil buffer solutions. At pH ≤ 7.2, two waves were obtained representing the uptake of 2- and 4-electron steps respectively. In alkaline media, a third wave appeared seemingly a result of the hydrolysis of oxazolones. The rate of hydrolysis was determined and the electr

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2

FASNIUC-PEREU, ELENA, ANDREI-EUGEN BULGARIU, and LAURA BULGARIU. "Spectrophotometric Characteristics of Rifaximin Aqueous Solution and The Consequences for Quantitative Analysis." Buletinul Institutului Politehnic din Iași, Secția Chimie și Inginerie Chimică 70, no. 2 (2024): 65–76. https://doi.org/10.5281/zenodo.13308277.

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Rifaximin is known as an oral antibiotic that can be used in a wide range of digestive diseases, but not only. Chemically, rifaximin is a yellow solid powder that can be relatively easily dissolved in methanol and which, because of its color, can be analyzed spectrophotometric. To be able to use such a simple method in the quantitative analysis of rifaximin, the most important spectrophotometric characteristics are required. In this study, these spectrophotometric characteristics (maximum wavelength (λ<sub>max</sub>, nm), spectral band width (Δλ<sub>1/2</sub>, nm), molar ab

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3

Rajendraprasad, Nagaraju, Kanakapura Basavaiah, and Kanakapura B. Vinay. "Titrimetric and Spectrophotometric Assay of Oxcarbazepine in Pharmaceuticals Using N-Bromosuccinimide and Bromopyrogallol Red." International Journal of Analytical Chemistry 2011 (2011): 1–8. http://dx.doi.org/10.1155/2011/138628.

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Titrimetric and spectrophotometric methods are described for the determination of oxcarbazepine (OXC) in bulk drug and in tablets. The methods use N-bromosuccinimide (NBS) and bromopyrogallol red (BPR) as reagents. In titrimetry (method A), an acidified solution of OXC is titrated directly with NBS using methyl orange as indicator. Spectrophotometry (method B) involves the addition of known excess of NBS to an acidified solution of OXC followed by the determination of the unreacted NBS by reacting with BPR and measuring the absorbance of the unreacted dye at 460 nm. Titrimetry allows the deter

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Vasilescu, Marilena, Rodica Bandula, F. Dumitrascu, and H. Lemmetyinen. "Spectrophotometric Characteristics of New Pyridylindolizine Derivatives Solutions." Journal of Fluorescence 16, no. 5 (2006): 631–39. http://dx.doi.org/10.1007/s10895-006-0114-8.

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5

Abdillah, Muhammad Helmy. "Physical and Chemical Characteristics of Solid Waste from Crumb Rubber Industry with Different Incubation Periode." Agrisains: Jurnal Budidaya Tanaman Perkebunan Politeknik Hasnur 6, no. 01 (2020): 1–7. http://dx.doi.org/10.46365/agrs.v6i01.377.

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Demand for crumb rubber and block rubber from abroad to increase thus encouraging crumb rubber agro industry factories in Indonesia to increase of the production, but this is not matched by environmental quality that should be increasingly considered. Pollution that appears to be seen in the form of changes in the color of water and solid material from the washing of latex crumbs as sludge which leaves a damaged latex, mixed with wood and other inorganic materials. In the process of handling liquid waste in Waste Water Treatment Plant (WWTP) ponds, liquid waste can be recycled so that it can b

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Maslov, Oleksandr Yu, Mykola A. Komisarenko, Yulia S. Kolisnyk, and Tatyana A. Kostina. "Determination of catechins in green tea leaves by HPLC compared to spectrophotometry." Journal of Organic and Pharmaceutical Chemistry 19, no. 3(75) (2021): 28–33. http://dx.doi.org/10.24959/ophcj.21.238177.

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Aim. To study the qualitative composition, the quantitative content of catechins in green tea leaves and compare the data obtained with those evaluated by spectrophotometry.Materials and methods. Green tea leaves used for the analysis were collected in Anhui Province, China. The extract for the HPLC analysis was obtained by the maceration method with 60 % ethanol twice in the raw material/extractant ratio of 1 : 20. In the case of the spectrophotometric analysis, green tea leaves were extracted with 70 % ethanol twice by the maceration method in the raw material/extractant ratio of 1 : 20. The

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7

Ivanovna, Kucherenko Lyudmila, Parniuk Natalia Viktorovna та Khromylova Olga Vladimirovna. "VALIDATION OF THE QUANTITATION METHODS OF 1-(β-PHENYLETHYL)-4-AMINO-1,2,4- TRIAZOLE BROMIDE SUBSTANCE BY SPECTROPHOTOMETRIC METHOD". Asian Journal of Pharmaceutical and Clinical Research 11, № 2 (2018): 231. http://dx.doi.org/10.22159/ajpcr.2018.v11i2.22740.

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Objective: The aim of the work was to determine the validation characteristics for the developed method of quantitation of 1-(β-phenylethyl)-4- amino-1,2,4-triazole bromide substance by absorption spectrophotometry in the ultraviolet region (UV).Methods: For study purposes, the 1-(β-phenylethyl)-4-amino-1,2,4-triazole bromide substance and the standard sample, obtained by the state enterprise “plant of chemical reagents” of scientific and technological complex “institute of single crystals” of the National Academy of Sciences of Ukraine, was used. In the course of our work, we used chemical, p

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Rakić, Violeta, Milena Miljković, Vojkan Miljković, and Nemanja Stančić. "INFLUENCE OF ADDITIVES ON SPECTROSCOPIC CHARACTERISTICS OF THE CARMINIC ACID." Applied Researches in Technics, Technologies and Education 6, no. 4 (2018): 333–39. http://dx.doi.org/10.15547/artte.2018.04.008.

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Foods must have attractive color, flavor and texture to be acceptable to consumers. Carminic acid (C.I. (1956) 75470; C.I. Natural Red 4; EEC No. E120) is a natural red dye extracted from cochineal, the desiccated bodies of female Dactylopius coccus Costa insects. Carminic acid produce pink shades in candy, confections, chewing gum, concentrated fruit juice, smoked fish, liqueurs and alcoholic cordials, soft drinks, yoghurt, ice cream, tomato ketchup, baked goods, dairy products, jams, jellies, eye shadow, and pill coatings. The impact of the presence of aspartame, citric acid and vitamin C on

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9

Rakić, Violeta, Milena Miljković, Vojkan Miljković, and Nemanja Stančić. "INFLUENCE OF ADDITIVES ON SPECTROSCOPIC CHARACTERISTICS OF THE CARMINIC ACID." International Conference on Technics, Technologies and Education, no. 1 (2018): 224–30. http://dx.doi.org/10.15547/ictte.2018.06.002.

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Foods must have attractive color, flavor and texture to be acceptable to consumers. Carminic acid (C.I. (1956) 75470; C.I. Natural Red 4; EEC No. E120) is a natural red dye extracted from cochineal, the desiccated bodies of female Dactylopius coccus Costa insects. Carminic acid produce pink shades in candy, confections, chewing gum, concentrated fruit juice, smoked fish, liqueurs and alcoholic cordials, soft drinks, yoghurt, ice cream, tomato ketchup, baked goods, dairy products, jams, jellies, eye shadow, and pill coatings. The impact of the presence of aspartame, citric acid and vitamin C on

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10

Moujtahid, A., J. Zorec, and A. M. Hubert. "On the Characteristics of Circumstellar Envelopes in Be Stars near the Central Object." International Astronomical Union Colloquium 175 (2000): 506–9. http://dx.doi.org/10.1017/s0252921100056372.

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AbstractObserved visible energy distributions of Be stars were studied with analytic flux distributions produced by flattened circumstellar envelopes. The theoretical representation of emitted fluxes also allows for density distribution effects in the region where the visible continuum emission/absorption is raised. Two main conclusions were reached: (a) regions responsible for spectrophotometric ”shell” phases have, on average, steeper density distributions than those producing the spectrophotometric ”Be” phases; (b) the mean temperatures of the studied circumstellar envelope regions shows a

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11

Lesia, Savchenko, Uminska Kateryna, Bevz Nataliia, and Georgiyants Victoriya. "Selection and verification of the method for phynelefrine hydrochloride assay in Simanovsky ointment." ScienceRise: Pharmaceutical Science, no. 1(11) (August 26, 2019): 26–31. https://doi.org/10.15587/2519-4852.2018.122094.

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Phenylephrine hydrochloride is a sympathomimetic with expressed local vasoconstrictor effect. Its ability to reduce swelling and hyperemia of the nasal mucosa is used in the Simanovsky ointment which is preparing for stock in the pharmacies of Ukraine. For the assay of phenylephrine hydrochloride in many single and multicomponent dosage forms, it is suggested to use a spectrophotometric method. However, in literary sources there are no examples of the use of spectrophotometric method for quantitative determination of phenylephrine hydrochloride in the studied ointment. <strong>Aim.</strong>&nb

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12

Teptereva, G. A., M. E. Loginova, and V. G. Konesev. "SPECTROPHOTOMETRIC CHARACTERISTICS OF LIGNOSULFONATES OF DIFFERENT WAYS OF GETTING." Oil and Gas Business, no. 6 (December 2018): 98. http://dx.doi.org/10.17122/ogbus-2018-6-98-114.

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13

Nishikawa, Harumitsu. "Thermal behavior of hydroxyapatite in structural and spectrophotometric characteristics." Materials Letters 50, no. 5-6 (2001): 364–70. http://dx.doi.org/10.1016/s0167-577x(01)00318-4.

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14

Rubio, Leticia, Ramona Díaz-Vico, Inés Smith-Fernández, et al. "Spectrophotometric Color Measurement to Assess Temperature of Exposure in Cortical and Medullar Heated Human Bones: A Preliminary Study." Diagnostics 10, no. 11 (2020): 979. http://dx.doi.org/10.3390/diagnostics10110979.

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Heated-bone color changes may provide information about temperature of exposure, with interest for anthropologists and forensic experts. The aim of this study was to assess heat-induced color changes by spectrophotometry in cortical and medullar human bones heated at different temperatures and times. CIELAB (International Commission on Illumination-LAB) color parameters (L*, a*, and b*) and whiteness (WI) and yellowness (YI) indexes were obtained by spectrophotometry in the cortical and medullar zones of 36 bone sections exposed at 200, 400, 600, and 800 °C for 30 and 60 min. The accuracy of c

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15

Jackson, Kerrian, Rohanie Maharaj, and Mark Dookeran. "Production and Characterisation of a Novel Dasheen (Colocasia esculenta) Alcoholic Fermented Beverage." West Indian Journal of Engineering 45, no. 2 (2023): 25–34. http://dx.doi.org/10.47412/ufbj4076.

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In this study, an alcoholic fermented beverage of acceptable quality characteristics was produced from two types of dasheen (Colocasia esculenta L. Schott) musts, A – boiled dasheen must and B – cooked dasheen with must, each at three total soluble solids (TSS) levels (18, 22 and 25 °Brix). Quality characteristics of pH, TSS, alcohol content, titratable acidity (TA), specific gravity (SG), and spectrophotometric, microbiological, and sensory evaluations were analysed in the fermented beverages. Fermentation caused pH, SG and TSS to decrease while simultaneously increased TA. Coliforms were not

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16

Wojciechowski, Krzysztof. "Spectrophotometric characteristics of N,N-dialkylamino-3- and -4-phenylazonaphthalimides." Dyes and Pigments 9, no. 6 (1988): 401–17. http://dx.doi.org/10.1016/0143-7208(88)82000-x.

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17

Krechetov, S. P., M. S. Maslennikova, N. L. Solovieva, and I. I. Krasnyuk. "DEVELOPMENT OF OPTIMAL COMPOSITION FORMULATION OF RESVERATROL AND SOLUBILISERS." Russian Journal of Biotherapy 20, no. 3 (2021): 57–65. http://dx.doi.org/10.17650/1726-9784-2021-20-3-57-65.

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Introduction. Increasing of poorly soluble pharmaceutical substances bioavailability is one of important problems of pharmaceutical technology. Resveratrol is a plant origin polyphenol with a broad spectrum of biological effects. However, due to poor solubility and, as a result, low bioavailability, it is not promising for the development of oral drugs. Thus, today resveratrol is presented only as a biologically active substance that is component of biologically active food supplements.The objective of the research is selection of the optimal solubilizer to increase the solubility of resveratr

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18

Konovalova, Olga Yu, Nataliia O. Nikitina, Valentyna Yu Nesterenko, Valeriia S. Savchenko, and Yelyzaveta G. Kobzar. "Gel-Electrophoretic Separation of a Number of Synthetic Food Dyes with Following Determination by Spectrophotometric and Visual Method: Simply and Economically." Methods and Objects of Chemical Analysis 18, no. 3 (2023): 126–35. http://dx.doi.org/10.17721/moca.2023.126-135.

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An aim of investigation was separation of synthetic food dyes E 102, E 110, E 122, E 124, E 129, E 132 and E 133 by method of planar gel-electrophoresis with following detection and determination of analytes directly on gel plate. Agar-agar gel or polyacrylamide gel was used as carrier. The influence of electrophoretic buffer pH, amperage, voltage as well as time of electrophoresis on dyes separation in agar-agar gel was investigated. Changing of dyes mobility with pH changing was explained by analysis of their ionization constants. The results of dyes electrophoretic separation were evaluated

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19

PRITI, SHIVHARE, and K. GUPTA V. "Spectrophotometric Determination of 2,2-Dichlorovinyldimethyl Phosphate (DDVP) and its Application in Water, Soil and Vegetables." Journal of Indian Chemical Society Vol. 68, May 1991 (1991): 287–88. https://doi.org/10.5281/zenodo.5992520.

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Department of Chemistry, Ravisbankar University, Raipur-492 010 <em>Manuscript received 28 November 1990, revised 9 April 1991, accepted 23 April 1991</em> A method has been developed for the spectrophotometric determination of 2,2- dicblorovinyldimethyl phosphate (DDVP), a insecticide, based on its alkaline hydrolysis to produce dichloroacetaldbeyde, yielding a fluorescent yellow coloured dye with <strong>J</strong> acid when heated in concentrated sulphuric acid medium. The method has been successfully applied for the determination of <strong>DDVP</strong> in water, soil and vegetables.

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20

Zhuk, Y. M., and S. O. Vasyuk. "Spectrophotometric determination of sotalol in tablets." Farmatsevtychnyi zhurnal, no. 1 (September 4, 2018): 49–55. http://dx.doi.org/10.32352/0367-3057.1.16.01.

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In this investigation a visible spectrophotometric method for the determination of sotalol based on the absorbance of colored product of the reaction between sotalol hydrochloride and bromcresol purple in acetone medium at 399 nm measurement was developed. The optimal conditions for the quantitative determination of sotalol hydrochloride in the content of pharmaceutical drugs were established. The stoichiometric relationship coefficients between sotalol hydrochloride and bromcresol purple were determined. The validation of the worked out procedure on such validated characteristics as linearity

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21

Mitic, Violeta, Snezana Nikolic, and Vesna Stankov-Jovanovic. "Kinetic spectrophotometric determination of hydrazine." Open Chemistry 8, no. 3 (2010): 559–65. http://dx.doi.org/10.2478/s11532-010-0021-3.

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AbstractA kinetic spectrophotometric method for hydrazine determination in the range of 9.36×10−7 to 4.37×10−5 mol dm−3, based on the inhibitory effect of hydrazine on the oxidation of Victoria Blue 4- R by KBrO3, was developed and validated. Kinetic parameters are reported for both the indicating and the inhibiting reaction. The detection limit was established as 9.98×10−8 mol dm−3. The selectivity of the proposed method was tested considering the influence of different ions that may be present in real samples. The method was successfully applied for hydrazine determination in various samples

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22

Ivanovna, Kucherenko Lyudmila, Idnenko Oleksandr Sergeevich, and Khromylova Olga Vladimirovna. "VALIDATION OF THE SPECTROFOTOMETRIC METHOD FOR THE DETERMINATION OF QUANTITATIVE COMPOSITION OF S-2,6-DIAGENOXIC ACID OF 3-METHYL-1,2,4-TRIAZOLYL- 5-THIOACETATE." Asian Journal of Pharmaceutical and Clinical Research 11, no. 9 (2018): 91. http://dx.doi.org/10.22159/ajpcr.2018.v11i9.26684.

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Objective: The aim of the work was to determine the validation characteristics for the designed procedure for quantitation of the (S)-2,6- diaminohexanoic acid substance, 3-methyl-1,2,4-triazolyl-5-thioacetate, by absorption spectrophotometry in the ultraviolet region.Methods: For study purposes, the substance (S)-2,6-diaminohexanoic acid of 3-methyl-1,2,4-triazolyl-5-thioacetate and a standard sample (SS) obtained from the State Enterprise “Chemical Reagents Plant” of the Scientific-Technological Complex “Institute of Single Crystals” of the National Academy of Sciences of Ukraine, was used.

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Ociepa, Ewa, and Agata Dudek. "Characteristics of the implant used in ophthalmology." Journal of Engineering 360 1, no. 1/24 (2024): 18–23. http://dx.doi.org/10.5604/01.3001.0054.8105.

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The purpose of work was a scientific analysis of lenticular implant intraocular applied in ophthalmology. Lenses of the Alcon Laboratories company were used for surveys. Spectrophotometric, macroscopic and roentgenographic examinations were conducted. The aim of the study was to determine as much information as possible about the analyzed implants using engineering and research methods. The evaluation was carried out as part of an engineering diploma thesis. As a result of the obtained research results, it was found that the applied techniques allow for the correct evaluation of the tested mat

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Chen, Liqing, Xiaofeng Yuan, Yulong Li, et al. "Rapid Determination of Thiourea Concentration in Copper Electrolyte." Processes 13, no. 4 (2025): 1092. https://doi.org/10.3390/pr13041092.

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Due to the characteristics of high salt and high acidity of the electrolyte and the chemical reaction between thiourea (Tu) and metal ions, it is still a problem to quickly and accurately detect Tu concentration in copper electrolyte. An improved spectrophotometric method has been proposed by simplifying the extraction steps of the traditional extraction–spectrophotometry and reducing the dosage of extractant and buffer. The improved method, with a favorable R2 of 0.9991, great precision of 1.67% and excellent spiked recovery of 102.19%, was not affected by the presence of gelatin and copper i

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Liang, Jinxing, Guanghao Wu, Ke Yang, et al. "Yarn Color Measurement Method Based on Digital Photography." Journal of Imaging 11, no. 8 (2025): 248. https://doi.org/10.3390/jimaging11080248.

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To overcome the complexity of yarn color measurement using spectrophotometry with yarn winding techniques and to enhance consistency with human visual perception, a yarn color measurement method based on digital photography is proposed. This study employs a photographic colorimetry system to capture digital images of single yarns. The yarn and background are segmented using the K-means clustering algorithm, and the centerline of the yarn is extracted using a skeletonization algorithm. Spectral reconstruction and colorimetric principles are then applied to calculate the color values of pixels a

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Ibrahim, Fawzia Ahmed, Nahed Mahmoud El-Enany, Rania Nabih El-Shaheny, and Ibraam Emad Mikhail. "Spectroscopic studies on naftazone and its metal complexes with analytical applications for quality control of tablets." Analytical Methods 7, no. 14 (2015): 5954–61. http://dx.doi.org/10.1039/c3ay41819g.

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The spectroscopic characteristics of the haemostatic drug naftazone as well as its metal complexing ability were investigated spectrophotometrically in order to develop new, simple and sensitive spectrophotometric methods for its determination.

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Kirtoka, I. A., Ye O. Schevchenko, O. M. Zhukovetska, and D. V. Snigur. "FORMATION AND ANALYTICAL CHARACTERISTICS OF THE IONIC PAIR OF TETRAIODOCADMIATE(II) WITH QUINALDINE RED." Odesa National University Herald. Chemistry 29, no. 2(88) (2024): 94–100. https://doi.org/10.18524/2304-0947.2024.2(88).322134.

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Among heavy metal ions, cadmium is one of the most toxic elements entering the ecosystem because of industrial activities. Today, there are a significant number of approaches to the detection and quantitative determination of Cadmium, among which spectrophotometric methods in various modifications occupy an important place, and to increase sensitivity and selectivity, pre concentration methods are used. A feature used to develop extraction-spectrophotometric methods for the determination of cadmium is its ability to form complex anions with halide ions of the composition [CdHal3]- and [CdHal4]

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Bonfilio, Rudy, Lívia Botacini Favoretto, Gislaine Ribeiro Pereira, Roberta de Cássia Pimentel Azevedo, and Magali Benjamim de Araújo. "Comparative study of analytical methods by direct and first-derivative UV spectrophotometry for evaluation of losartan potassium in capsules." Brazilian Journal of Pharmaceutical Sciences 46, no. 1 (2010): 147–55. http://dx.doi.org/10.1590/s1984-82502010000100017.

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Losartan potassium is an antihypertensive non-peptide agent, which exerts its action by specific blockade of angiotensin II receptors. The aim of the present study was the validation and application of analytical methods for the quality control of losartan potassium 50 mg in pharmaceutical capsules, using direct and first-derivative UV spectrophotometry. Based on losartan potassium spectrophotometric characteristics, a signal at 205 nm of the zero-order spectrum and a signal at 234 nm of the first-derivative spectrum, were found adequate for quantification. The results were used to compare the

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29

Petruk, V. G., A. P. Ivanov, S. M. Kvaternyuk, and V. V. Barunb. "Spectrophotometric Method for Differentiation of Human Skin Melanoma. II. Diagnostic Characteristics." Journal of Applied Spectroscopy 83, no. 2 (2016): 261–70. http://dx.doi.org/10.1007/s10812-016-0279-0.

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Bokov, Dmitry Olegovich. "STANDARDIZATION OF SNOWDROP (GALANTHUS L.) HERBAL PHARMACEUTICAL SUBSTANCES BY UV-SPECTROPHOTOMETRY." Asian Journal of Pharmaceutical and Clinical Research 11, no. 10 (2018): 207. http://dx.doi.org/10.22159/ajpcr.2018.v11i10.26867.

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Objective: The objective of the present study is to evaluate the electronic ultraviolet (UV) absorption spectra of herbal pharmaceutical substances (70% ethanol extracts) prepared from medicinal plant material of two snowdrop species – Galanthus woronowii Losinsk and Galanthus nivalis L.Methods: The groups of biologically active substances were investigated by UV-spectrophotometry including special sample preparation for flavonoids and alkaloids.Results: In the present study, data were obtained characterizing the composition of the main biologically active compounds of the genus Galanthus L.,

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Lakhera, Prarthna, Sonia Narwal, and Minkal Tuteja. "PREFORMULATION STUDIES AND PROSPECTIVE VALIDATION OF UV-SPECTROPHOTOMETRIC METHOD OF AMOXICILLIN TRIHYDRATE." INDIAN DRUGS 61, no. 05 (2024): 52–58. http://dx.doi.org/10.53879/id.61.05.14444.

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The current study was embarked upon to evaluate and assess the physicochemical characteristics of amoxicillin trihydrate. The determination and validation of UV-spectrophotometric for amoxicillin trihydrate was included in the study. The different physical characteristics used in preformulation, including solubility, FTIR, loss on drying, melting point, pH, flow qualities, moisture content and partition coefficient, were carefully evaluated and scrutinized. The proposed methods of analysis for amoxicillin trihydrate provide a simple, accurate, and reliable way of analyzing salivary fluid in a

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Popović, Boris M., Dubravka Štajner, Ružica Ždero, Saša Orlović, and Zoran Galić. "Antioxidant Characterization of Oak Extracts Combining Spectrophotometric Assays and Chemometrics." Scientific World Journal 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/134656.

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Antioxidant characteristics of leaves, twigs, and acorns from two Serbian oak speciesQuercus roburL. andQuercus petraeaL. from Vojvodina province (northern Serbia) were investigated. 80% ethanol (in water) extracts were used for antiradical power (ARP) determinations againstDPPH•,NO•, andO2∙-radicals, ferric reducing antioxidant power (FRAP), total phenol, tannin, flavonoid, and proanthocyanidin contents. Permanganate reducing antioxidant capacity (PRAC) was determined using water extracts. Beside, mentioned parameters, soluble proteins, lipid peroxidation (LP), pigments and proline contents w

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G, Batsukh, Gangbaatar D, Khaltar D, Jargal B, Baatarchuluun Ts, and Ochirbat D. "On the determination of spectral optical characteristics of the earth atmosphere." Физик сэтгүүл 5, no. 555 (2022): 88–105. http://dx.doi.org/10.22353/physics.v5i555.699.

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Spectral optical characteristics of the earth atmosphere are used and can be used for the physical state analysis of the atmosphere and right accounting of radiation extinction in carring out of environmental remote sensing, determination of the composition and properties of aerosols and solar energy absolute spectrophotometric measurements as well as for the selection of the optimum conditions of solar energetic installations work and an evaluation of the atmosphere pollution in the different regions of the globe.

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Lam, Marco C., Robert J. Smith, Iair Arcavi, Iain A. Steele, Josh Veitch-Michaelis, and Lukasz Wyrzykowski. "Automated SpectroPhotometric Image REDuction (ASPIRED)." Astronomical Journal 166, no. 1 (2023): 13. http://dx.doi.org/10.3847/1538-3881/acd75c.

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Abstract We provide a suite of public open-source spectral data-reduction software to rapidly obtain scientific products from all forms of long-slit-like spectroscopic observations. Automated SpectroPhotometric REDuction (ASPIRED) is a Python-based spectral data-reduction toolkit. It is designed to be a general toolkit with high flexibility for users to refine and optimize their data-reduction routines for the individual characteristics of their instruments. The default configuration is suitable for low-resolution long-slit spectrometers and provides a quick-look quality output. However, for r

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Udonkang, Mfoniso I., Imeobong J. Inyang, Affiong N. Ukorebi, Faith Effiong, Uwem Akpan, and Iya E. Bassey. "Spectrophotometry, Physiochemical Properties, and Histological Staining Potential of Aqueous and Ethanol Extracts of Beetroot on Various Tissues of an Albino Rat." Biomedicine Hub 3, no. 3 (2018): 1–10. http://dx.doi.org/10.1159/000492828.

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Background and Aims: Natural dyes and pigments are nontoxic, ecofriendly alternatives to synthetic counterparts and beetroot is one such natural dye. The red color of beetroot derived from betalain pigments confers great advantage to this plant. In this study, the physiochemical and spectrophotometric characteristics of beetroot as well as the histological staining potential of various tissues were carried out to determine its tissue specificity. Methods: The aqueous and ethanol extracts of beetroot were prepared using distilled water and 95% ethanol, respectively. Spectrophotometry, pH, and c

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Bacherikov, Yu Yu, O. B. Okhrimenko, D. V. Pekur, et al. "Multifunctional spectrophotometric sensor based on photosensitive capacito." Semiconductor Physics, Quantum Electronics and Optoelectronics 27, no. 04 (2024): 495–501. https://doi.org/10.15407/spqeo27.04.495.

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The work demonstrates the possibility of using a structure, which is similar to the structure of a powder photosensitive capacitor, as a spectrophotometric sensor. For creating an active photosensitive layer of the sensor, a suspension of ZnS:Cu:Al:Cl particles uniformly distributed in a dielectric matrix C 3 H 5 (C 18 H 33 O 3 ) 3 was used as a dielectric layer between the capacitor plates. It was shown that, depending on the characteristics of the active layer material (particle size and material, dielectric matrix properties) and the configuration of the electrical circuit, the sensor can e

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Klovak, Viktoriia, and Kulichenko Sergey. "Spectrophotometric and Fluorescent Determination of Hydrophobic Organic Cations in the Surfactant-modified System Mo(VI)– Bromopyrogallol Red." Methods and Objects of Chemical Analysis 18, no. 2 (2023): 55–62. http://dx.doi.org/10.17721/moca.2023.55-62.

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The spectrophotometric and fluorescent characteristics of the surfactant-modified molybdenum (VI) – bromopyrogallol red reagent system were studied. The hydrophobic modification was achieved by adding cationic, nonionic surfactants, or, accordingly, mixtures of surfactant modifiers into the metal reagent system. Modification of the metal reagent system with a nonionic surfactant leads to a decrease in the limit of detection of the hydrophobic organic cation in the molybdenum (VI) – bromopyrogallol red system by the fluorescence method and an increase in the contrast of the spectrophotometric r

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AlSalem, Huda Salem, Faisal K. Algethami, Maimana A. Magdy, et al. "Harnessing spectrophotometry resolution power for determining ternary mixture for respiratory disorders treatment in their pharmaceutical formulation." PLOS ONE 19, no. 10 (2024): e0311121. http://dx.doi.org/10.1371/journal.pone.0311121.

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A ternary mixture incorporating Hydroxyzine hydrochloride (HYX), Ephedrine hydrochloride (EPH) and Theophylline (THP) frequently prescribed for the treatment of respiratory diseases. Herein, two spectrophotometric methods are designated and applied to resolve these three components in their mixture. Method A is ratio-subtraction combined with derivative spectrophotometry, where THP can be determined directly at its λmax 271 nm (neither HYX or EPH interfere), then for determination of HYX and EPH, the ternary mixture was divided by 22 μg/mL of THP and after subtraction of the plateau region, HY

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Masek, Anna, Ewa Chrzescijanska, Malgorzata Latos-Brozio, and Marian Zaborski. "Characteristics of juglone (5-hydroxy-1,4,-naphthoquinone) using voltammetry and spectrophotometric methods." Food Chemistry 301 (December 2019): 125279. http://dx.doi.org/10.1016/j.foodchem.2019.125279.

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Belov, M. L., T. I. Kopysova, and V. A. Gorodnichev. "Using Remote Laser Technique in Measuring Oil Film Thickness on Water Surface in the Eye-Safe Spectral Range." Herald of the Bauman Moscow State Technical University. Series Instrument Engineering, no. 2 (131) (June 2020): 85–97. http://dx.doi.org/10.18698/0236-3933-2020-2-85-97.

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Possibilities were studied of using a remote laser spectrophotometric method in measuring thickness of oil films on a wavy water surface with utilization of discretely tunable laser source operating at eye-safe narrow spectral range around ~ 2.1 μm. Laser spectrophotometric method is based on measuring reflection coefficient of the water surface on five probing wavelengths and finding thickness of the oil film by the quasisolution search method. It is proposed to use an optical parametric generator tunable along a wavelength in the 1.5--2.6 μm spectral range as a radiation source. Results of m

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Rudometova, N. V., and I. S. Kim. "Research of the physical and chemical properties and methods of Red rice (food colour) determination in sausage products." Theory and practice of meat processing 5, no. 4 (2020): 23–28. http://dx.doi.org/10.21323/2414-438x-2020-5-4-23-28.

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In Russia, in the production of meat and sausage products, the food colour, named as Red rice, is use. Red rice is obtain by the cultivation the strains of the Monascus fungus on various carbohydrate substrates, for example rice. That Red rice may contain the mycotoxin citrinin, but neither the purity of the food colour nor the safety profile are regulated. The aim of this work was to study the physical and chemical properties of Red rice and to develop method for its determination in sausage products. The experiments were carried out on model and commercial samples of sausages. The samples we

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Fletcher, E. C., T. Miller, and J. I. Thornby. "Accuracy of fiberoptic central venous saturation catheter below 50%." Journal of Applied Physiology 64, no. 5 (1988): 2220–23. http://dx.doi.org/10.1152/jappl.1988.64.5.2220.

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The fiberoptic central venous flotation catheter has gained widespread clinical acceptance for continuous monitoring of mixed venous oxyhemoglobin saturation. There are obvious research applications to this device, especially in monitoring very low central venous saturations in response to hypoxic challenge and cardiopulmonary exercise testing. However, the accuracy of this device has not been established in such low saturation ranges in humans. This study examines the tracking characteristics of the Opticath (Oximetrix, Mountain View, CA) pulmonary arterial catheter in comparison to simultane

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Алукер, Н. Л., та M. Herrmann. "Спектрофотометрическое определение форм присутствия йода в растворах соединений йода". Оптика и спектроскопия 129, № 5 (2021): 659. http://dx.doi.org/10.21883/os.2021.05.50895.303-20.

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Optical characteristics of aqueous solutions of crystalline iodine and iodine compounds are investigated; the presence of different forms of iodine and selected concurrent compounds in aqueous solutions are determined. The applicability of direct spectrophotometric methods to detecting various forms of iodine and concurrent compounds in aqueous solutions is evaluated.

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Snigur, D. V. "SPECTROPHOTOMETRIC DETERMINATION OF COPPER (II) AFTER DISPERSIVE LIQUID-LIQUID EXTRACTION OF ITS COMPLEX WITH 6,7-DIHYDROXY-4-METHYL-2-PHENYLBENZOPYRYLIUM CHLORIDE." Odesa National University Herald. Chemistry 26, no. 4(80) (2021): 52–60. http://dx.doi.org/10.18524/2304-0947.2021.4(80).248296.

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The specificity of the dispersive liquid-liquid semi-microextraction of Copper (II) complex with 6,7-dihydroxy-4-methyl-2-phenylbenzopyryl chloride has been studied. It is noted that the transition to semi-microextraction technology can significantly reduce the toxic organic solvents consumption, and the use of dispersion solvent can intensify the complex extraction of Сopper (II) complex with 6,7-dihydroxy-4-methyl-2-phenylbenzopyryl chloride. Optimal conditions for spectrophotometric determination of Сopper (II) after dispersive liquid-liquid semi-microextraction of its complex with 6,7-dihy

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T., Manjunatha, Kumar Vadlapudi, Prathap H.M., et al. "Evaluation of in vitro antioxidant potential of Anisomeles indica Kuntze and exploration of its bioactive phytoconstituents." Biomedicine 43, no. 3 (2023): 873–81. http://dx.doi.org/10.51248/.v43i3.2541.

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Introduction and Aim: Anisomeles indica Kuntze (A. indica) is employed to treat a wide range of illnesses. The Present study was aimed at establishing preliminary phytochemical screening, UV-Visible spectrophotometric, FT-IR analysis, and evaluation of biological activities of A. indica extracts.  Materials and Methods: A. indica leaves were employed for the Soxhlet extraction. Furthermore, the crude extracts were utilized for phytochemical analysis and quantitative estimations of phenolics and flavonoids. UV-Vis spectrophotometric, and FT-IR analysis provided further evidence for

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Denisova, S. A., and A. E. Lesnov. "EFFECT OF SURFACTANT DIFFERENT NATURE ON SPECTROPHOTOMETRIC CHARACTERISTICS OF THE SCANDIUM COMPLEX WITH XYLENOL ORANGE." Вестник Пермского университета. Серия «Химия» = Bulletin of Perm University. CHEMISTRY 9, no. 3 (2019): 240–49. http://dx.doi.org/10.17072/2223-1838-2019-3-240-249.

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At various pH values, the effects of surfactants of different types have been studied: catamine AB, oxy-phos B, synthanol ALM-10 on the spectrophotometric characteristics of scandium with xylenol orange (XO). For complexation of scandium with XO, the optimum pH range is 1.56–2.44, the introduction of catamine AB under these conditions does not significantly affect the spectrophotometric characteris-tics of the complexes. The bathochromic shift from 508 to 637 nm and an increase in the intensity of light absorption by almost three times in the XO – Sc system — katamine AB occurs at a pH of 6.15

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KAMIŃSKA, WIKTORIA, GRAŻYNA NEUNERT, and MACIEJ JARZĘBSKI. "ANALIZA WŁAŚCIWOŚCI FIZYKOCHEMICZNYCH I CHARAKTERYSTYKA SPEKTROFOTOMETRYCZNA WYBRANYCH OLEJÓW ROŚLINNYCH." Zywnosc Nauka Technologia Jakosc/Food Science Technology Quality 31, no. 1 (2024): 113–33. http://dx.doi.org/10.15193/zntj/2024/138/490.

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Introduction. Vegetable oils are a known source of mono- and polyunsaturated fatty acids (MUFA and PUFA). The growing demand for vegetable oils, rich in unsaturated fatty acids, increases the use of new oil plants to obtain them. In this study, the physicochemical properties (density, pH, refractive index, dynamic viscosity, contact angle, surface tension, color) were examined, a spectroscopic analysis was carried out and antioxidant properties were determined. In order to determine the indicated parameters, simple and easily accessible analytical methods were used, which provide key informati

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Zamaraeva, A. I., N. S. Bessonova, T. A. Kobeleva, and A. I. Sichko. "Research in the field of analysis of the soft dosage form «Metroterbinazol» used in medical practice." Medical Science And Education Of Ural 21, no. 3 (2020): 32–36. http://dx.doi.org/10.36361/1814-8999-2020-21-3-32-36.

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Aim. Development of a method of analysis of metronidazole and terbinafine in ointment «Metroterbinazol» using spectrophotometry. Materials and methods. A soft dosage form containing 0.1 g of metronidazole, terbinafine and 9.8 g of Tizol gel was used as the object of research. Pharmacopoeia reagents and the method of spectrophotometry were used for experimental work. Measurements were carried out on the SF-2000 spectrophotometer in the near ultraviolet region (λ = 210-340 nm). Results. To achieve this goal, we studied the electronic absorption spectra and optical characteristics of metronidazol

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Kašiković, Nemanja. "Thermovision and spectrophotometric analysis of ink volume and material characteristics influence on colour changes of heat treated printed substrates." Tehnicki vjesnik - Technical Gazette 22, no. 1 (2015): 33–41. http://dx.doi.org/10.17559/tv-20130928115500.

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TANASĂ, IUSTINA-DENISA, ANDREI-EUGEN BULGARIU, CĂTĂLINA SIRIŢEANU, and LAURA BULGARIU. "Spectrophotometric Determination of Rifampicin in Aqueous Solution." Buletinul Institutului Politehnic din Iași, Secția Chimie și Inginerie Chimică 68, no. 3 (2022): 25–34. https://doi.org/10.5281/zenodo.7544287.

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In this study, a simple spectrophotometric method was developed for the quantitative determination of rifampicin in aqueous solution. The method is based on the property of rifampicin to modify, in aqueous media at pH of 7.0, the degree of ionization of the functional groups. After ionization, a coloured compound is formed, which can be analysed spectrophotometrically. The visible spectra of the yellow compound were recorded at pH of 7.0, in different buffer solutions (phosphate, hexamethylentetraamine (HMT) and borax) and the qualitative characteristics were determined. The highest absorbance

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