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Artykuły w czasopismach na temat „Ammonium acetate uv spectrum”

Autor: Grafiati

Data publikacji: 3 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

S., Anitha, Ganapathi M., and Ravi A. "SYNTHESIS OF SUBSTITUTED SULFONAMIDE BEARING IMIDAZOLE DERIVATIVES AND ITS CHARACTERIZATION." International Journal of Applied and Advanced Scientific Research 1, no. 2 (2017): 1–4. https://doi.org/10.5281/zenodo.256148.

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The sulfonamide bearing imidazole derivatives have been synthesized via two stages of chemical reactions. In a first stage, various substituted benzaldehyde condensed with benzil and ammonium acetate in presence L-Proline served as green catalyst. In a second stage, the series of substituted imidazole derivatives were reacted with benzene sulfonyl chloride in the presence of triethyl amine base. All synthesized compounds were characterized by various spectral techniques like UV-Visible, FTIR and <sup>1</sup>H NMR spectral analysis respectively. UV- Visible and FTIR spectra of each of the synth

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Borodina, Daria A., Yulia A. Gonchikova, Elena A. Illarionova, and Anastasia E. Mitina. "Development and validation of a method for isolating stavudine from biological fluids." Человек и его здоровье 24, no. 1 (2021): 62–68. http://dx.doi.org/10.21626/vestnik/2021-1/08.

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Objective - study of isolating Stavudine from biological fluids (urine, blood plasma). Materials and methods. Objects of research: substance and tablets of 30 mg Stavudine. Reagents: purified water, chloroform, ethyl acetate, dichloromethane, ether, heptane, toluene, acetone, 95% ethyl alcohol, 0.1 M hydrochloric acid solution, 10% ammonium hydroxide solution, 5%solutions of sodium sulfate, 20%sodium sulfate saturated, sodium chloride, sodium chloride saturated, 20%ammonium sulfate, ammonium sulfate saturated. Universal ionomer IT-1101. Stavudine was isolated by liquid-liquid extraction. To de

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Sahu, Dojalisa, Nihar R. Panda, and Debasrita Dash. "ZnO Nanosheets Exhibiting High UV Blocking Efficiency for Effective Application in Sunscreen." Asian Journal of Chemistry 32, no. 7 (2020): 1809–14. http://dx.doi.org/10.14233/ajchem.2020.22726.

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Zinc oxide (ZnO) nanopowder has been prepared by wet chemical method and tested for its effective UV blocking property coated on photosensitive paper/fabric samples. Zinc acetate dihydrate and ammonium hydroxide were adopted as synthesis precursors. Phase and crystallographic analysis of the samples have been carried out by X-ray diffraction (XRD) and show that ZnO sample belong to hexagonal wurtzite phase without any impurity. Surface morphology of ZnO samples studied by field emission scanning electron microscopy (FESEM) shows the formation of nanosheets with porous structure. These porous n

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Subadra, I. Nyoman, Luh Putu Mirah Kusuma Dewi Kusuma Dewi, and I. N. K. Widjaja Widjaja. "PEMANFAATAN GESERAN POLA SPEKTRUM UV SENYAWA GOLONGAN BARBITURAT DALAM UJI KONFIRMASI DENGAN METODE TLC-SPEKTROFOTODENSITOMETRI." Indonesian Journal of Legal and Forensic Sciences (IJLFS) 9, no. 1 (2019): 19. http://dx.doi.org/10.24843/ijlfs.2019.v09.i01.p03.

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A Research of the utilization of spectrum shift in confirmation test for barbiturate using TLC-Spectrophotodensitometry has been done. Analyte was analyzed using two mobile phases, that are TD (chloroform: acetone = 80 : 20) and TE (ethyl acetate: methanol: ammonia = 85 : 15 : 5) with Al-TLC Silica 60 GF254 plate as the stationary phase. Afterwards, plate was sprayed with HCl or KOH. The analyzed parameters were hRfc, normal UV-spectrum pattern and its shift. The correlation of spectrum or the shift of UV-spectrum for barbiturate compounds was determined with Wincats program. The analysi

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Karpushyna, S. A., S. V. Baiurka, I. Y. Halkevych, S. I. Ihlitska, O. O. Altukhov, and I. E. Bylov. "Development of conditions for isolation of antidepressant paroxetine from biological fluids." News of Pharmacy 107, no. 1 (2024): 119–24. http://dx.doi.org/10.24959/nphj.24.133.

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Aim. To develop optimized conditions for isolating the new antidepressant paroxetine from model blood and urine samples by the liquid extraction followed by the determination of the analyte using the UV spectrophotometric method. Materials and methods. The studies were performed with model samples of the donor blood and urine spiked with paroxetine. In the sample preparation of blood, the form elements were previously precipitated by 10 % solution of trichloroacetic acid. Endogenous impurities were removed by the extraction purification with chloroform from an acidic medium at pH 1, and paroxe

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6

Han, Hui Kai, Jin Cheng Huang, Hang Qi, and Du You Lu. "Preparation of ZnSe Quantum Dots by Hydrothermal Method Assisted by Ammonia." Materials Science Forum 956 (June 2019): 99–106. http://dx.doi.org/10.4028/www.scientific.net/msf.956.99.

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ZnSe quantum dots (QDs) with high intrinsic fluorescence quantum efficiency (QY) and low defect luminescence were prepared by hydrothermal method assisted with ammonia, in which the selenium powder and zinc acetate were used as Se and Zn source, and the mercaptopropionic acid (MPA) was used as ligand. Effect of ammonia amount, Zn/Se ratio, Zn/MPA ratio, and reaction time was investigated in detail in this study. The as-prepared ZnSe QDs were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-visible absorption spectrum (UV-Vis), fluorescence spectrum (PL). ZnS

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Rachman, Ihsan Budi, and Deana Wahyuningrum. "Synthesized 2,4,5-Triphenylimidazole as Precursor of Organic Light Emitting Diode (OLED) Material." Advanced Materials Research 896 (February 2014): 468–71. http://dx.doi.org/10.4028/www.scientific.net/amr.896.468.

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Current research based on fluorescent organic material has many advantages. One of advantages fluorescent organic material is as OLED (Organic Light Emitting Diode) based devices. OLED compound is rigid conjugated organic molecules. 2,4,5-triphenylimidazole (3) was synthesized by microwave assisted organic synthesis method. The first stage of synthesis is the synthesis of bibenzoyl (2) produced from the solventless oxidation reaction of benzoin (1) by atmospheric oxygen using MAOS (Microwave Assisted Organic Synthesis) method with chemical yields of 99.18% and melting point of bibenzoyl is 94-

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Baiurka, S., S. Karpushina, and S. Merzlikin. "The development of the conditions for vortioxetine isolation from biological fluids." News of Pharmacy, no. 1(101) (February 1, 2021): 18–22. http://dx.doi.org/10.24959/nphj.21.45.

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The chemical-toxicological significance of antidepressant drugs is steadily increasing. The development of effective methods of the sample preparation of the biological material is an important analytical aspect in toxicology of the newgeneration antidepressants. Aim. To develop the conditions for the sample preparation of biological fluids in order use them in the chemicaltoxicological analysis of the new antidepressant vortioxetine. Materials and methods. The studies were performed with model blood and urine samples spiked with vortioxetine. When examining the blood the formed blood elements

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Jawad, Fahmi K., and Nathera Abass Ali AL-Tememee. "Effect of pH on the Structural and Optical Properties of Cadmium oxide Thin Films Prepared Using the Successive Ionic Layer Adsorption and Reaction (SILAR) Method." Iraqi Journal of Physics (IJP) 20, no. 1 (2022): 63–71. http://dx.doi.org/10.30723/ijp.v20i1.975.

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Cadmium oxide (CdO) thin films were deposited using the sequencing ion layer adsorption and reaction (SILAR) method. In this study, the effect of the pH value of an aqueous solution of cadmium acetate at a concentration of 0.2 mol of the cadmium oxide film was determined. The solution source for the cadmium oxide film was cadmium ions and an aqueous ammonia solution. The CdO films were deposited on glass substrates at a temperature of 90 ℃. The cadmium oxide film thickness was determined by the weight difference method at pH values (7.2, 8.2). X-ray diffraction (XRD) and scanning electron mi

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Rukundo, Aimable, Peter Michael Dass, and I. I. Nkafamiya. "Evaluation of the effect of Beetroot Dye on Banana Pseudo Stem and Pineapple Leaves Fibres." NEWPORT INTERNATIONAL JOURNAL OF RESEARCH IN MEDICAL SCIENCES 5, no. 2 (2024): 18–28. http://dx.doi.org/10.59298/nijrms/2024/5.2.01828.

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Extraction and characterization of dye from beetroot scientifically known as Beta vulgaris was achieved. The dye was extracted using two extraction method namely Soxhlet with methanol as solvent and water where the beetroot powder was soaked in water and heat at 30-400C for 2 hours. It was observed that due to instability of beetroot dye at high temperature, aqueous dye extraction is preferable over Soxhlet extraction as the one extracted with Soxhlet changed its color from purple to black brown. Moreso, the extracted dye was characterized. Qualitative photochemical analysis, Anti-bacterial ac

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Bober, Katarzyna, Marlena Płonka, and Marek Miszczyk. "Desloratadine analysis: as a pharmaceutical preparation and after accelerating ageing." Current Issues in Pharmacy and Medical Sciences 28, no. 3 (2015): 181–85. http://dx.doi.org/10.1515/cipms-2015-0068.

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AbstractDesloratadine is a biologically active compound that is not described in the Polish Pharmacopoeia IX, hence, its study is particular important. The aim of this work was to establish a procedure for desloratadine analysis by way of HPTLC in combination with densitometry, so as to be able to ascertain its presence and degree of presence within pharmaceutical preparations. In our work, a mixture of ethyl acetate, n-butanol, ammonia and methanol was used as the mobile phase. Moreover, HPTLC plates precoated with silica gel 60F254were also employed. The proposed method was tested and subseq

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Aybaba, Cigdem, Ismail Murat Palabiyik, Mehmet Gokhan Caglayan, and Feyyaz Onur. "Multivariate Optimization of Separation Conditions for Simultaneous Determination of Acemetacin and Chlorzoxazone in a Pharmaceutical Preparation by HPLC Using Response Surface Methodology." Journal of AOAC INTERNATIONAL 96, no. 4 (2013): 723–29. http://dx.doi.org/10.5740/jaoacint.11-092.

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Abstract A new, fast, accurate, precise, and sensitive RP-HPLC method for the simultaneous determination of acemetacin and chlorzoxazone has been developed. Response surface methodology with a central composite design was used to optimize the acetonitrile and ammonium acetate percentage in the mobile phase and pH of ammonium acetate. The optimum separation was achieved on a C18 column (250 × 4.6 mm id, 5 μm particle size) using the mobile phase methanol–acetonitrile–0.02 M ammonium acetate, pH 9.4 (25 + 35 + 40, v/v/v) at a flow rate of 1.5 mL/min; UV detection at 270 nm, and cyanocobalamin as

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Bautista Maezono, Shizuka Mei, Tej Narayan Poudel, Likai Xia, and Yong Rok Lee. "A green synthetic approach to synthesizing diverse 2-pyridones for their exceptional UV shielding functions." RSC Advances 6, no. 85 (2016): 82321–29. http://dx.doi.org/10.1039/c6ra18661k.

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Kordi, Zohreh Kheil, Ghodsi Mohammadi Ziarani, Alireza Badiei, and Negar Lashgari. "Synthesis of 1,4-Dihydropyridine as a Fluorescent and Colorimetric Chemosensor for Detection of Fe3+ Ion." Sensor Letters 17, no. 10 (2019): 747–54. http://dx.doi.org/10.1166/sl.2019.4137.

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A new fluorescent and colorimetric sensor for Fe3+ ion were synthesized via four-component reaction of acetophenone, dimedone, benzaldehyde and ammonium acetate in the presence of SrFe12O19. The chemosensor shows excellent sensitivity toward Fe3+ ion. The sensing ability of the chemosensor was studied by fluorescent and UV-Vis spectroscopy. The detection limits for Fe3+ were calculated respectively about 8.3 × 10–6 M and 2.3 × 10–6 M for fluorescence and UV-Vis techniques.

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H. K. Semwal and Himanee Bisht. "Spectroscopic Analysis of Ammonium Nickel Sulphate Solution." International Journal of Scientific Research in Science and Technology 11, no. 5 (2024): 13–16. http://dx.doi.org/10.32628/ijsrst2411423.

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Using double-beam UV/Vis spectrophotometer, the spectrum absorbed by the solution of Ammonium Nickel Sulphate (H8N2NiO8S26H2O) determined, and the relationship between concentration and absorption was graphed. Using a cuvette containing distilled water in the reference cell and Ammonium Nickel Sulphate with a concentration of 0.0871 mole/litre in the sample cell, absorption was measured at various wavelengths.

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Neamţu, Andreea Silvia, Andrei Biţă, Ion Romulus Scorei, et al. "Simultaneous quantitation of nicotinamide riboside and nicotinamide in dietary supplements via HPTLC–UV with confirmation by online HPTLC–ESI–MS." Acta Chromatographica 32, no. 2 (2020): 128–33. http://dx.doi.org/10.1556/1326.2019.00600.

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The identification and quantitation of nicotinamide riboside (NAR) and its main related compound (nicotinamide) were achieved using high-performance thin-layer chromatography (HPTLC)–ultraviolet (UV) densitometry with confirmation by online electrospray ionization (ESI)–mass spectrometry (MS). As the stationary phase, HPTLC Si 60 F254 glass plates were employed; the mobile phase was ethanol–1 M ammonium acetate–formic acid (7:1:0.1, v/v/v). No derivatization was applied, and UV densitometry was performed in the absorbance mode (270 nm). The method was validated by specificity, linearity, accur

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Jaglan, Prem S., Byron L. Cox, Thomas S. Arnold, Marc F. Kubicek, Dorothy J. Stuart, and Terry J. Gilbertson. "Liquid Chromatographic Determination of Desfuroylceftiofur Metabolite of Ceftiofur as Residue in Cattle Plasma." Journal of AOAC INTERNATIONAL 73, no. 1 (1990): 26–30. http://dx.doi.org/10.1093/jaoac/73.1.26.

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Abstract A liquid chromatographic (LC) method has been developed for the determination of the desfuroylceftiofur metabolite of ceftiofur as a residue in the plasma of animals. Plasma sample in 0.1 M pH 8.7 phosphate buffer containing dithioerythritol is Incubated under nitrogen for 15 min at 50°C. The sample is centrifuged, charged to a C18 cartridge, and washed with 0.1M ammonium acetate. The desfuroylceftiofur residue on the cartridge Is derivatized by adding 0.1M ammonium acetate containing iodoacetamide and letting the cartridge stand in the dark for 30 min. The cartridge is then drained a

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Holland, David C., Robert K. Munns, Jose E. Roybal, Jeffrey A. Hurlbut, and Austin R. Long. "Liquid Chromatographic Determination of the Anticoccidial Drug Halofuginone Hydrobromide in Eggs." Journal of AOAC INTERNATIONAL 78, no. 1 (1995): 37–40. http://dx.doi.org/10.1093/jaoac/78.1.37.

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Abstract A liquid chromatographic (LC) method is described for the determination of 5-100 ppb halofuginone hydrobromide (HFG) in eggs. HFG as the free base is extracted from eggs with ethyl acetate. The extract is cleaned up on an acidic Celite 545 column. A Waters C18 column is used for LC separation with UV determination at 243 nm. The isocratic mobile phase is a mixture of water-acetonitrile-ammonium acetate buffer (12 + 5 + 3) and acetic acid. The interassay average recovery from eggs was 90.4%, with a standard deviation of 5.11 and a relative standard deviation of 5.65%.

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Sun, Jidong. "Liquid Chromatographic Determination of Carotenoids and Vitamins A and E in Multivitamin Tablets." Journal of AOAC INTERNATIONAL 82, no. 1 (1999): 68–72. http://dx.doi.org/10.1093/jaoac/82.1.68.

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Abstract Carotenoids and vitamins A and E in multivitamin tablets can be determined simultaneously by reversed-phased liquid chromatography (LC) with a programmable UV detector. Samples were dissolved in dimethyl sulfoxide and thenextracted with hexane. A portion was injected onto a SymmetryC18,150 × 4.6 mm id, 5 μm column and chroma tographed with a mobile phaseof acetonitrile–0.25% ammonium acetate in methanol and 0.05% triethylamine in dichloromethane. A step gradient was used. The system was operated at 25°C with a flow rate of 1.5 mL/min. UV detection was at 325 nm for retinols, 285 nm fo

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SEPTIANO, ALVIN, Haryasena Gusti Andayu, and Imam Maulana. "Study of the Optical Properties of Bioplastic-Lead as an Alternative Packaging Material for X-ray Radiation Protection." Kreator 11, no. 2 (2025): 14–19. https://doi.org/10.46961/kreator.v11i2.1456.

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This research aims to characterize the optical properties of bioplastic packaging based on a mixture of cassava starch and lead acetate as an alternative material for X-ray radiation protection. The experimental method was used by varying the composition of a mixture of cassava starch and lead acetate in ratios of 100:0, 70:30, 65:35, 60:40, 55:45, 50:50, and 45:55. Optical characterization was carried out using UV-Vis spectrophotometry to measure the absorbance, reflectance and transmittance of the sample. The results show that samples with higher lead acetate concentrations have greater abso

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Ahmed, R. M. "Optical Study on Poly(methyl methacrylate)/Poly(vinyl acetate) Blends." International Journal of Photoenergy 2009 (2009): 1–7. http://dx.doi.org/10.1155/2009/150389.

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Transparent films of poly(methyl methacrylate)/poly(vinyl acetate) blend with different concentrations were prepared by using solution-cast technique. FT-IR transmission spectra were carried for the samples to detect the influence of UV radiation. In addition, optical absorption measurements were carried out for the samples at room temperature across the 190–900 nm wavelength regions before and after exposure to UV and filtered radiation using xenon arc lamp. The study has been also extended to include the changes in the optical parameters including the band tail width and band gap energies fo

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Al-Thani, Hamda A., Abeer A. Al Yafeai, and Falah S. Hasoon. "Effect of Ammonium Acetate Concentration on the Structural and Optical Properties of CdS Thin Film Grown by Chemical Bath Deposition Technique." MRS Advances 1, no. 37 (2016): 2603–16. http://dx.doi.org/10.1557/adv.2016.368.

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ABSTRACTThis study focuses on understanding the influence of incorporating Ammonium Acetate into the chemical bath used for the deposition of CdS thin films, on its optical, morphology, and microstructural properties. Thus, CdS thin films were deposited on 1” × 2” microscopic glass substrates using chemical bath deposition (CBD) technique. The deposition process was carried out in a double jacket beaker with fixed chemical bath temperature of 90°C for a deposition time of 40 min. The chemical bath solution consisted of fixed concentrations of Cadmium Acetate, Thiourea, and Ammonium Hydroxide;

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Atmoko, Doni Prio, Eva Marliana, and Erwin Erwin. "ISOLATION AND CHARACTERIZATION OF TERPENOID COMPOUNDS FROM LEAVES OF Macaranga beccariana Merr." JURNAL KIMIA MULAWARMAN 16, no. 1 (2018): 22. http://dx.doi.org/10.30872/jkm.v16i1.670.

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Isolation and characterization of terpenoid compounds from ethyl acetate fraction of Macaranga beccariana Merr. have been done. The separation process at ethyl acetate fraction using gravity column chromatography with gradient elution method. The obtained isolates were tested for purity using thin layer chromatography with various eluents namely n-hexane, chloroform, methanol, acetone and ethyl acetate with Rf values 0; 0.75; 0.80; 0.87 and 0.97 respectively. The terpenoids which were successfully isolated were white crystals with a mass of 0.0119 grams. UV analysis produced 1 peak at l 207.03

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Sari, Ochtavia Prima, and Titik Taufiqurrohmah. "ISOLATION AND IDENTIFICATION OF FLAVONOID COMPOUND EXTRACTIRE ETHYL ACETATE FRACTION EXTRACTED FROM THE RHIZOMES FINGERROOT OF (Boesenbergia pandurata (Roxb.) Schlecht) (Zingiberaceae)." Indonesian Journal of Chemistry 6, no. 2 (2010): 219–23. http://dx.doi.org/10.22146/ijc.21764.

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Boesenbergia pandurata (Roxb.) Schlecht is one of fingerroot plant in ginger family (Zingiberaceae). The rhizomes of the plant contained a lot of secondary metabolites compounds. Therefore, the purpose of the research is to isolate and identify the flavonoid compound from the plant. The rhizomes were extracted with metanol continued by partition using ethyl acetate-water (1:1). The ethyl acetate extract was chromatographed on a column of Si gel (Vacuum Liquid Chromatography and Gravitation Column Chromatography) using n-hexane-ethyl acetate (5:2) as eluents. Further purification by recristaliz

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Puspitaningrum, Anisa, Berna Elya, and Katrin . "ISOLATION AND CHARACTERIZATION OF ANTIOXIDANT COMPOUNDS FROM ETHYL ACETATE AND METHANOL EXTRACTS OF GARCINIA DAEDALANTHERA PIERRE LEAVES." International Journal of Applied Pharmaceutics 10, no. 1 (2018): 276. http://dx.doi.org/10.22159/ijap.2018.v10s1.61.

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Objective: This study aimed to isolate and characterize the compounds responsible for the high antioxidant activities of the ethyl acetate and methanolextracts of Garcinia daedalanthera Pierre leaves.Methods: In this study, the ethyl acetate extract was obtained by column chromatography, and the methanol extract was obtained by vacuum columnchromatography. The mobile phase comprised n-hexane, ethyl acetate, and methanol with increased polarity. Antioxidant activity was examined usingthe 1,1-diphenyl-2-picrylhydrazyl (DPPH) method. The fraction with the highest antioxidant activity was purified

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Pace, Christopher M., Joseph R. Donnelly, Jeffrey L. Jeter, William C. Brumley, and G. Wayne Sovocool. "Determination of Aromatic Amines in Soils." Journal of AOAC INTERNATIONAL 79, no. 3 (1996): 777–83. http://dx.doi.org/10.1093/jaoac/79.3.777.

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Abstract A rapid liquid chromatographic (LC) method with ultraviolet (UV) or fluorescence detection was developed for parts-per-billion levels of aromatic amines in soils. 2,4-Diaminotoluene, pyridine, aniline, 2-pi-coline, 2-toluidine, 5-nitro-2-toluidine, 2-methyl-6-ethylaniline, 4-aminobiphenyl, 4-nitroaniline, 1-naphthyl-amine, 2-methoxyaniline, and 2-naphthyiamine were tested. The method involves extraction by sonication with 1% ammonium hydroxide–acetonitrile and analysis by LC using gradient elution with aqueous 0.01 M ammonium acetate–0.0005% triethylamine and acetonitrile. Recoveries

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Wang, Ming Yang, Mao Sheng Wan, and Cheng Bo Cao. "Synthesis and Properties of the Composite DSD Acid-Triazine Structure Containing Long-Chain Quaternary Ammonium Fluorescent Brighteners." Applied Mechanics and Materials 260-261 (December 2012): 83–86. http://dx.doi.org/10.4028/www.scientific.net/amm.260-261.83.

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The cetyl \ octadecyl dimethyl tertiary amine（percentage composition 7:3）is a very common and inexpensive chemical raw material in the chemical market. In this paper, a series of the new chemical composite DSD acid-triazine structure containing long chain quaternary ammonium salt fluorescent brighteners (FBs) were synthesized through a three-step condensation reaction of cyanuric chloride, DSD acid, cetyl \ octadecyl dimethyl tertiary amine and amino compound. The obtained compounds were characterized by the analysis of the IR spectrum, UV spectrum and fluorescence excitation and emission spec

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Sardella, Roccaldo, Styliani Xiroudaki, Laura Mercolini, et al. "Optimized Extraction of Amikacin from Murine Whole Blood." Molecules 26, no. 3 (2021): 665. http://dx.doi.org/10.3390/molecules26030665.

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Amikacin (Amk) analysis and quantitation, for pharmacokinetics studies and other types of investigations, is conventionally performed after extraction from plasma. No report exists so far regarding drug extraction from whole blood (WB). This can represent an issue since quantification in plasma does not account for drug partitioning to the blood cell compartment, significantly underrating the drug fraction reaching the blood circulation. In the present work, the optimization of an extraction method of Amk from murine WB has been described. The extraction yield was measured by RP-HPLC-UV after

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Šubrt, Jan, Jose M. Criado, Lórant Szatmáry, et al. "Mechanochemical Synthesis of Visible Light Sensitive Titanium Dioxide Photocatalyst." International Journal of Photoenergy 2011 (2011): 1–9. http://dx.doi.org/10.1155/2011/156941.

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Phase transition of anatase nanoparticles into the phases TiO2-II and rutile under grinding was studied. The addition of ammonium carbamate to the reaction mixture inhibits the phase conversion and the cold welding of particles. The UV-visible absorption spectrum showed narrowing the band gap width after grinding with an ammonium carbamate additive resulting in shift of the light absorption of the ground sample towards the visible region. By EPR, intensive formation of OH•radical at irradiation of the sample with both UV (λ> 300 nm) and visible (λ> 435 nm) light was observed. High photoc

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Al-Moameri, Harith Hasoon, Mohammed Ali Abdulrehman, and Ismail Ibrahim Marhoon. "The Optical, Structural and Thermal Properties of Transparent Poly (Methylmethacrylate)/Cellulose Acetate Phthalate Blend." Defect and Diffusion Forum 398 (January 2020): 98–105. http://dx.doi.org/10.4028/www.scientific.net/ddf.398.98.

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Miscible transparent blend consist of poly (methylmethacrylate) with cellulose acetate phthalate was prepared in order to get more transparent blend for ultraviolet rays. The blend was prepared by melt-blending and examined using UV-VIS spectroscopy. The structural, mechanical and thermal properties of selected samples were studied using X-ray diffraction, scanning electron microscopy, dynamic mechanical analysis, and thermos-gravimetric analysis. The UV-VIS spectrum exhibited the best blend ratio which has low absorbency to ultraviolet rays, On the other hand, high optical transparency within

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Shen, Xiao Yi, Yi Sun, Yuan Liang, Yu Chun Zhai, and Zhi Qiang Ning. "Influence of PEG20000 on Ultrafine ZnO Flowers." Advanced Materials Research 239-242 (May 2011): 1743–46. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.1743.

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With zinc acetate and sodium hydroxide used as raw materials, while polyethylene glycol employed as dispersant agent, ultrafine zinc oxide flowers were successfully synthesized by hydrothermal method. The influence of the concentration of PEG20000 on the morphologies of ZnO flowers was discussed. The as-synthesized ZnO flowers consisted of microrods with hexagonal morphologies. The crystal structure and ultraviolet absorbing performance of ZnO flowers were also characterized using XRD, UV-VIS absorption spectrum. The results indicate that ZnO flowers are hexagonal wurtzite structure with high

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Bagwan, S. M., and Mohamad Asif. "An Efficient and One Pot Synthesis of 2,4,5-Trisubstituted Imidazole Derivatives Catalyzed by Silver Nanoparticles." Asian Journal of Chemistry 34, no. 4 (2022): 889–93. http://dx.doi.org/10.14233/ajchem.2022.23589.

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Silver nanoparticles (AgNPs) have been used as an excellent and highly efficient catalyst for one pot synthesis of 2,4,5-trisubstituted imidazole derivatives in presence of ethanol as a solvent. This synthetic route involves multicomponent reaction of benzil, substituted aromatic aldehydes and ammonium acetate under reflux. The synthesized silver nanoparticles were characterized by UV-visible spectroscopy (UV-visible), X-ray diffraction (XRD) pattern, scanning electronic microscope (SEM) analysis. The process was simple and environmentally benign with high to excellent yield. The methods provi

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Ipolyi, I., W. Corns, P. Stockwell, and P. Fodor. "Speciation of inorganic selenium and selenoamino acids by an HPLC-UV-HG-AFS system." Journal of Automated Methods and Management in Chemistry 23, no. 6 (2001): 167–72. http://dx.doi.org/10.1155/s1463924601000207.

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For the on-line speciation of selenocystine (SeCys), selenomethionine (SeMet), selenoethionine (SeEt), selenite (Se(IV)) and selenate (Se(VI)), a high-performance liquid chromatography-UV irradiation-hydride generation-atomic fluorescence spectro- metric method is described. Separation was carried out on a conventional reversed-phase C18 column modified with didodecyl- dimethylammonium bromide with gradient elution applying two concentrations of ammonium acetate as the mobile phase. UV irradiation and hydride generation parameters were optimized. The obtained detection limits for SeCys, SeMet,

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Nagalakshmi, G. "Synthesis and Pharmacological Evaluation of 2-(4-Halosubstituted phenyl)-4,5-diphenyl-1H-imidazoles." E-Journal of Chemistry 5, no. 3 (2008): 447–52. http://dx.doi.org/10.1155/2008/921256.

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In the present study, 2-(4-halosubstituted phenyl)-4,5-diphenyl-1Himidazoles have been synthesized by refluxing benzil and ammonium acetate with different 4-halosubstituted aromatic aldehydes in glacial acetic acid. The structural assignment of this compound has been made on the basis of elemental analysis, UV, IR,1H NMR and Mass spectral data. Toxicity of the compound has been determined. The synthesized compound was evaluated for antiinflammatory activity against carrageenan induced paw oedema and anticonvulsant activity against maximal electro-shock-induced convulsions in rats.

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Xie, Zhen Hai, and Jian Kang Li. "Preparation and Characterization of Chemical Bath Deposited CdS Thin Films for Solar Cells." Materials Science Forum 743-744 (January 2013): 438–42. http://dx.doi.org/10.4028/www.scientific.net/msf.743-744.438.

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Chemical bath deposition of CdS thin film for solar cells was investigated in this study. CdS thin films were prepared by chemical-bath deposition (CBD) from a bath containing cadmium acetate, ammonium chloride, ammonium hydroxide and thiourea in aqueous solution on the glass substrate at certain bath temperature. The characterization of samples was conducted by using different methods such as scanning electron microscopy (SEM), X-ray diffraction (XRD) and ultraviolet spectrophotometry (UV). The crystal quality of CdS thin films was improved after CdCl2 thermal annealing at 400C. The results s

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Aprilian, Rafly, Mas Ayu Elita Hafizah, Azwar Manaf, and Andreas. "Conversion Enhancement of Vinyl Acetate Monomer to Polyvinyl Acetate Emulsion through Emulsion Polymerization Method." Materials Science Forum 1028 (April 2021): 263–68. http://dx.doi.org/10.4028/www.scientific.net/msf.1028.263.

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Synthesis of Polyvinyl Acetate (PVAc) through the conversion of Vinyl Acetate Monomer (VAM) was carried out by emulsion polymerization method assisted by thermal initiator Ammonium persulfate (APS) under reaction temperature was kept at 70 °C – 80 °C with 5 hours of reaction time and agitation speed at 300 rpm. The polymerization reaction was running used batch process technique where is all components were mixed all together simultaneously. A set of polymerization reactions was conducted when the absence of surfactant and cationic and amphoteric surfactant presence. The monomer chain's double

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Sivasankari, B., and P. Selvarajan. "Growth and Characterization of ULMA Single Crystals Doped with Ammonium Chloride." Journal of Materials 2013 (March 31, 2013): 1–7. http://dx.doi.org/10.1155/2013/216732.

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Single crystals of pure and ammonium chloride-doped urea L-malic acid (ULMA) were grown by slow evaporation technique. Many interesting results on several properties of ammonium chloride impurity added to ULMA single crystals have been observed and studied. The different morphology of ammonium chloride-doped ULMA crystals was noticed and the effect of ammonium chloride doping on the growth, optical, and hardness properties has been investigated. The presence of functional groups has been estimated by FTIR analysis. The lattice parameters of the grown crystals were studied by single crystal X-r

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Vorobets, Vera, Gennadii Kolbasov, Sergii Fomanyuk, Nataliia Smirnova, and Oksana Linnik. "DETERMINATION OF CU(II) CONCENTRATION IN AQUEOUS MEDIUM USING INVERSION ELECTROCHEMICAL METHOD." Ukrainian Chemistry Journal 85, no. 7 (2019): 24–30. http://dx.doi.org/10.33609/0041-6045.85.7.2019.24-30.

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Electrode materials based on titanium dioxide modified with zinc ions and gold nanoparticles, synthesized by sol-gel method, were used to determine the concentration of Cu (II) in liquids by stripping voltammetry method. Determination of Cu (II) was done using background solutions based on 0.4 M formic acid and ammonium acetate buffer (pH = 7.5) using the standard addition method with a potential scanning speed of 50 mV•s-1. The solution was stirred during the preliminary electrolysis at a potential of -1400 mV (vs silver-chloride reference electrode) for 120 seconds and then the potential was

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Vorobets, Vera, Gennadii Kolbasov, Sergii Fomanyuk, Nataliia Smirnova, and Oksana Linnik. "DETERMINATION OF Cu(II) CONCENTRATION IN AQUEOUS MEDIUM USING INVERSION ELECTROCHEMICAL METHOD." Ukrainian Chemistry Journal 85, no. 9 (2019): 58–64. http://dx.doi.org/10.33609/0041-6045.85.9.2019.58-64.

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Electrode materials based on titanium dioxide modified with zinc ions and gold nanoparticles, synthesized by sol-gel method, were used to determine the concentration of Cu (II) in liquids by stripping voltammetry method. Determination of Cu (II) was done using background solutions based on 0.4 M formic acid and ammonium acetate buffer (pH = 7.5) using the standard addition method with a potential scanning speed of 50 mV•s-1. The solution was stirred during the preliminary electrolysis at a potential of -1400 mV (vs silver-chloride reference electrode) for 120 seconds and then the potential was

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40

Laharika Choudary, Mannava, Medidi Srinivas, and Bula Udaya Kumari. "Department of Pharmaceutical Chemistry, Geethanjali College of Pharmacy, Cheeryal (V), Keesara (M), Medchal (D), Hyderabad-501301." Journal of Drug Delivery and Therapeutics 14, no. 7 (2024): 64–70. http://dx.doi.org/10.22270/jddt.v14i7.6703.

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A RP-HPLC/UV method was developed and validated to quantify the etifoxine in capsule dosage form. The chromatographic separation was carried out using a Hypersil ODS C18 column (250×4.6 mm, 5 μm) with a mobile phase consisting of an ammonium acetate buffer: acetonitrile in a volumetric ratio of 40:60%. The UV wavelength chosen for detection was at 255 nm. The flow rate was set at 1 ml/min. The retention time for etifoxine was determined to be 2.074 min. Linearity was detected within the concentration range of 7.5-45 μg/mL for etifoxine. The approach has been confirmed to be linear, accurate, p

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Faizee, A., S. S. Sonawane, A. S. Patil, S. J. Kshirsagar, and V. S. Gade. "DEVELOPMENT OF LIQUID-LIQUID EXTRACTION PROCEDURE AND ITS APPLICATION FOR QUANTIFICATION OF ERLOTINIB IN SPIKED HUMAN PLASMA USING RP-HPLC WITH UV DETECTION." INDIAN DRUGS 53, no. 06 (2016): 46–50. http://dx.doi.org/10.53879/id.53.06.10498.

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A simple, rapid and accurate RP-HPLC method was developed and validated for the quantification of Erlotinib in spiked human plasma using liquid-liquid extraction. Sufficient recovery was obtained when drug and internal standard (Nabumetone) were extracted using ethyl acetate and 1N NaOH. Chromatographic separation was performed on C18 Phenomenex Hyperclone column (250 × 4.6 mm, 5 μm) using mobile phase acetonitrile: 20 mM ammonium acetate buffer pH 4.6 (60:40%,V/V). Flow rate was kept constant at 1 mL/min and detection was carried out at 331 nm. Calibration curve was found to be linear in the

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42

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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Long, Fei, Shuyi Mo, Yan Zeng, Shangsen Chi, and Zhengguang Zou. "Synthesis of Flower-Like Cu2ZnSnS4Nanoflakes via a Microwave-Assisted Solvothermal Route." International Journal of Photoenergy 2014 (2014): 1–4. http://dx.doi.org/10.1155/2014/618789.

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Flower-like Cu2ZnSnS4(CZTS) nanoflakes were synthesized by a facile and fast one-pot solution reaction using copper(II) acetate monohydrate, zinc acetate dihydrate, tin(IV) chloride pentahydrate, and thiourea as starting materials. The as-synthesized samples were characterized by X-ray diffraction (XRD), Raman scattering analysis, field emission scanning electron microscopy (FESEM) equipped with an energy dispersion X-ray spectrometer (EDS), transmission electron microscopy (TEM), and UV-Vis absorption spectra. The XRD patterns shown that the as-synthesized particles were kesterite CZTS and Ra

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SALEM, JAMIL K., TALAAT M. HAMMAD, and ROGER G. HARRISON. "ZnO NANOPARTICLES PREPARED IN THE PRESENCE OF ADDITIVES BY THERMAL DECOMPOSITION METHOD." International Journal of Nanoscience 08, no. 04n05 (2009): 465–72. http://dx.doi.org/10.1142/s0219581x09006237.

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In this study, different additives such as cetyltrimethylammonium bromide (CTAB), aluminum nitrate and tri-n-octylphosphine oxide (TOPO) are selected, respectively, to bind zinc acetate in order to investigate its role in the formation of ZnO nanoparticles. Accordingly, the morphology and size of produced ZnO nanoparticles are affected by existence of the additives through XRD analyses and TEM observations. The particle size was found to be 32, 14, 15, and 28 nm for pure zinc acetate, zinc acetate/TOPO, zinc acetate/CTAB, and zinc acetate/aluminum nitrate, respectively. It is observed that the

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Kuerbanjiang, Kediye, Kuerbanjiang Rouzi, and Si-Yu Zhang. "Nitrophenyl Thiourea-Modified Polyethylenimine Colorimetric Sensor for Sulfate, Fluorine, and Acetate." Sensors 24, no. 12 (2024): 3751. http://dx.doi.org/10.3390/s24123751.

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A thiourea-based colorimetric sensor incorporating polyethyleneimine (PEI) and chromophoric nitrophenyl groups was synthesized and utilized for detecting various anions. Structural characterization of the sensor was accomplished using FTIR and 1H-NMR spectroscopy. The sensor’s interactions and colorimetric recognition capabilities with different anions, including CI−, Br−, I−, F−, NO3−, PF6−, AcO−, H2PO4−, PO43−, and SO42−, were investigated via visual observation and UV/vis spectroscopy. Upon adding SO42−, F−, and AcO− anions, the sensor exhibited distinct color changes from colorless to yell

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Mcneilly, Patrick J., Valerie B. Reeves, and E. J. Ian Deveau. "Determination of Ceftiofur in Bovine Milk by Liquid Chromatography." Journal of AOAC INTERNATIONAL 79, no. 4 (1996): 844–47. http://dx.doi.org/10.1093/jaoac/79.4.844.

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Abstract A liquid chromatographic procedure is described for determination of ceftiofur (CEF) residues in milk. Milk samples were diluted with ammonium acetate solution and extracted on a C18 solid-phase extraction (SPE) column. After the analyte was eluted from the SPE column with methanol, extract volumes were reduced under nitrogen, diluted to 2.0 mL with acetate buffer, and filtered. CEF was determined after separation of milk components by reversed-phase chromatography with UV detection at 293 nm. Recoveries of CEF from bovine milk fortified at 25,50, and 100 ppb were 86.1,90.8, and 92.0%

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WANG, PYINGHUA, XINGCHANG WANG, AIHUA WANG, BINGLIN ZHANG, YONGTIAO TIAN, and NING YAO. "SYNTHESIS AND OPTICAL PROPERTIES OF THE MULTILAYER STARLIKE ZnO NANOSTRUCTURES." International Journal of Modern Physics B 25, no. 08 (2011): 1143–48. http://dx.doi.org/10.1142/s0217979211058389.

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A novel multilayer starlike ZnO nanostructure has been successfully synthesized on a Si (111) substrate at 600°C by chemical vapor deposition using Zn and zinc acetate dihydrate as the source materials. The morphology, structure, and optical properties are investigated by field emission scanning electron microscopy, X-ray diffraction, Raman and photoluminescence (PL) spectrum, respectively. The results show that the multilayer starlike ZnO nanostructures have hexagonal wurtzite structure. The room-temperature PL spectrum shows the dominant green band peak and the weak UV peak. The possible gro

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Khurram, Shahzad, Abbas Faheem, Pandey Digvijay, Ajmal Sanila, Khadim Mudassar, and Usman Tahir Muhammad. "Synthesis, characterization and biological evaluation of novel tetrasubsituted Imidazole compounds." Journal of PeerScientist 3, no. 1 (2020): e1000019. https://doi.org/10.5281/zenodo.3901332.

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New classes of tetrasubsituted imidazole based compounds were synthesized using multicomponent one pot synthesis scheme through cyclocondensation reaction of benzil, aromatic primary amines, aldehydes and ammonium acetate in glacial acetic acid. The synthesized compounds have been analyzed and characterized by melting point, color, conductivity method, CHN analysis, FT-IR and UV-Visible. The reaction proceeding was examined by TLC after regular intervals of period. To test biological activity, the synthesized compounds have been examined against various bacterial strains. From the analysis of

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Amanda, Hilda. "The Isolation and Characterization of Phenolic Compound of Euphorbia Plant/Patikan Cina (Euphorbia thymifolia Linn)." Journal of Chemical Natural Resources 1, no. 1 (2019): 40–44. http://dx.doi.org/10.32734/jcnar.v1i1.833.

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Euphorbia plant, Euphorbia thymifolia Linn, is one the Euphorbiaceae families that still need to be developed due to its benefits. An effort to be able to use this plant maximumly is by studying the active component in the plant. This study aims to isolate and characterize phenolic compound in euphorbia plant extract using ethyl acetate. 500 gram of euphorbia plant (Patikan Cina) powder was macerated using methanol. Then, the macerated extract was evaporated to eliminate excess solvent and as a result, a solvent-free extract was obtained. Next, the result was partitioned with a solution of met

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