Characterization of the Ultraviolet Absorption Spectra of Some Substituted Benzene-sulfonamides

Vandenbelt, J. M.; Doub, Leonard.

doi:10.1021/ja01238a007

Cited by 19 publications

(3 citation statements)

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“…Therefore the UV-visible adsorption spectrum would be the function of pH for such dye molecules in aqueous solution, owing to their existence as a cationic, neutral, anionic or dianionic species. 32,33 For fluorescein, this is due to the conversion of -OH to O À , which decreases the transition energy and hence increases the wavelength in the UV-visible spectrum. Again for rhodamine B, the difference between the peaks obtained from basic and acidic media was comparatively less (552.32 and 556.75 nm) than that of the fluorescein, because there was no hydroxy group present on it, but only the conversion of a single -COOH to -COO À with formation of free -NR 3 from -NHR 3 + .…”

Section: Resultsmentioning

confidence: 99%

Synthesis, functionalization and bioimaging applications of highly fluorescent carbon nanoparticles

et al. 2011

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Highly fluorescent crystalline carbon nanoparticles (CNPs) have been synthesized by one step microwave irradiation of sucrose with phosphoric acid at 100 W for 3 min 40 s. This method is very simple, rapid and economical and hence can be used for large scale applications. The average particle sizes are 3 to 10 nm and they emit bright green fluorescence under the irradiation of UV-light. Therefore, the particles can be used as a unique material for bioimaging as well as drug delivery. To further increase the fluorescence property of the synthetic carbon nanoparticles we simply functionalized them by using different organic dyes, such as fluorescein, rhodamine B and α-naphthylamine; the maximum fluorescence intensity was observed for the particles functionalized with fluorescein. It is very interesting to note that all of those compounds show maximum fluorescence intensity at 225 nm excitation wavelength and for any excitation wavelength the peak positions are exactly same the position as that of CNPs itself, which is completely different from the individual precursors (dyes). All of the above compounds, including CNPs, have also been successfully introduced into the erythrocyte enriched fraction of healthy human blood cells with minimum cytotoxicity.

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Section: Resultsmentioning

confidence: 99%

Synthesis, functionalization and bioimaging applications of highly fluorescent carbon nanoparticles

et al. 2011

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“…Accuracy was confirmed by molecular absorption spectroscopy with a Shimadzu Spectrophotometer UV-1800 (Shimadzu Corporation, Japan), controlled by a computer with the UVProbe software (version 2.50), in the ultraviolet region with absorption at 259 nm [50] and a spectral band width of AE 0.2 nm. The standard addition method was used, consisting of diluting the samples (1 : 100) using ultrapure water with subsequent additions of SFL standard solutions.…”

Section: Comparative Method: Spectrometric Methodsmentioning

confidence: 99%

A Novel Electrochemical Sensor Based on Silsesquioxane/Nickel (II) Phthalocyanine for the Determination of Sulfanilamide in Clinical and Drug Samples

et al. 2019

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This paper describes the immobilization of nickel (II) phthalocyanine‐tetrasulfonic acid tetrasodium salt (NiTsPc) in 3‐n‐propyl(3‐methylpyridinium) silsesquioxane chloride (Si3Pic+Cl−). This hybrid material was synthetized and characterized by 29Si NMR CP‐MAS, FTIR and DRS. The modified material, designated as Si3Pic+Cl−/NiTsPc, was used to build carbon paste electrodes to determine sulfanilamide (SFL) by differential pulse voltammetry. The modified electrode showed a higher current response when compared to the bare carbon paste electrode. The evaluation of SFL was possible in the presence of salicylic acid, commonly used in solid ointment compositions in a high concentration. Theoretical calculations using density functional theory were done aiming to shed light at dimerization process at SFL. The oxidation peak increased with increasing concentrations of SFL in the range of 35–301 μmol L−1. The LOD and LOQ values obtained were 12 and 35 μmol L−1 of SFL, respectively. The novel electrochemical sensor was successfully applied for the determination of SFL in pet drug samples, urine and serum through the standard addition method. Validation was performed through a comparison with values obtained by the molecular absorption spectrometry method and there were no significant differences in the results, as confirmed by the statistical paired t‐test. This demonstrates the promise of a new approach for analytical application in clinical and drug samples of sulfonamide compounds.

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“…In strongly acidic media, however, exocyclic nitrogen protonation (i.e., amine protonation) was suggested. 36,37 That point is also cleaned out in our work.…”

Section: Resultsmentioning

confidence: 99%

Spectroscopic Determination and Evaluation of Acidity Constants for Some Drug Precursor 2-Amino-4-(3- or 4-substituted phenyl) Thiazole Derivatives

2010

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Characterization of the Ultraviolet Absorption Spectra of Some Substituted Benzene-sulfonamides

Abstract: Several publications have described the ultraviolet absorption spectra of sulfanilamide derivatives,1•2•3•4 but very little has been done toward identification and characterization of the individual absorption bands occurring in these spectra.6•6•7

Cited by 19 publications

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Synthesis, functionalization and bioimaging applications of highly fluorescent carbon nanoparticles

Synthesis, functionalization and bioimaging applications of highly fluorescent carbon nanoparticles

A Novel Electrochemical Sensor Based on Silsesquioxane/Nickel (II) Phthalocyanine for the Determination of Sulfanilamide in Clinical and Drug Samples

Spectroscopic Determination and Evaluation of Acidity Constants for Some Drug Precursor 2-Amino-4-(3- or 4-substituted phenyl) Thiazole Derivatives

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