Yayın tarihi için Kimya Bölümü listeleme
Toplam kayıt 171, listelenen: 41-60
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Ultrasound-assisted supramolecular solvent dispersive liquid-liquid microextraction for preconcentration and determination of Cr (VI) in waters and total chromium in beverages and vegetables.
(Elsevier, 2021)Simple, sensitive, selective and green ultrasound assisted supramolecular solvent dispersive liquid-liquid microextraction (UA–SUPRAS-DLLME) method was developed for preconcentration and determination of chromium ions in ... -
Experimental and theoretical investigation for the spectrophotometric determination of thiabendazole in fruit samples
(Elsevier, 2021)A simple, green, and effective vortex-assisted dispersive liquid–liquid microextraction method was developed for separation, preconcentration and spectrophotometric determination of thiabendazole in fruit samples. This ... -
Feasibility of supramolecular nanosized solvent based microsyringe-assisted liquid-phase microextraction for preconcentration and separation of Vitamin B12 from infant formula, food supplement, and dairy products: Spectrophotometric analysis and chemometric optimization
(Elsevier, 2021)Here, a novel cheap and green analytical method based on supramolecular nanosized solvent based microsyringe-assisted liquid phase microextraction (SS MA LPME) was developed and validated for preconcentration and separation ... -
Response surface methodology based on central composite design for optimizing temperature-controlled ionic liquid-based microextraction for the determination of histamine residual in canned fish products
(Elsevier, 2021)A rapid and simple analytical procedure for the determination of histamine in canned fish products using temperature-controlled ionic liquid-based microextraction (TC-IL-ME) mated to chemometric tool and coupled to ... -
A new analytical approach for preconcentration, separation and determination of Pb(II) and Cd(II) in real samples using a new adsorbent: Synthesis, characterization and application
(Elsevier, 2021)A green and efficient analytical approach was reported for simultaneous preconcentration, and separation of Pb(II) and Cd(II) in water, vegetables, and barbecue samples by dispersive solid-phase microextraction prior to ... -
Ionic hydrophobic deep eutectic solvents in developing air-assisted liquid-phase microextraction based on experimental design: Application to flame atomic absorption spectrometry determination of cobalt in liquid and solid samples
(Elsevier, 2021)This paper reports a new and simple microextraction procedure for cobalt determination using green ionic hydrophobic deep eutectic solvent in developing air-assisted liquid-phase microextraction and flame atomic absorption ... -
An optimization approach for fast, simple and accurate determination of indigo-carmine in food samples
(Elsevier, 2021)This study report optimization of vortex-assisted natural deep eutectic solvent based liquid-phase microextraction (VA-NADES-LPME) for determination of indigo-carmine in some food samples by UV–Visible spectrophotometer. ... -
Ultrasonic-assisted cloud point microextraction and spectrophotometric determination of Ponceau 4R in various beverage samples using Non-ionic surfactant PONPE 7.5
(Taylor & Francis, 2021)In the current study, a simple, cheap, and fast analytical procedure, termed ultrasonic-assisted cloud point microextraction (UA-CPME), combined with UV-VIS spectrophotometry, was developed for the pre-concentration and ... -
Application of a novel poly(SMAm)-Tris-Fe3O4 nanocomposite for selective extraction and enrichment of Cu(I) /Cu(II) from beer, soft drinks and wine samples, and speciation analysis by micro-volume UV-Vis spectrophotometry
(ELSEVIERRADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS, 2021)In this study, a novel functional nanocomposite was synthesized, characterized and selectively used in pHcontrolled separation, pre-concentration and speciation analysis of Cu(I) and Cu(II) from sample matrices where ... -
Self-adjoint extensions for a class of singular operators
(Turkish Journal of Mathematics, 2021)In this study, we consider the domains of the minimal and maximal operators generated of singular differential-expression-type Sturm–Liouville and obtain all self-adjoint extensions of the operator in terms of ... -
Use of new polymeric composites for preconcentration of trace Ag+ ions from the selected mushroom/vegetables by ultrasoundassisted cloud-point extraction coupled to microvolume UV-Vis spectrophotometry
(Taylor&Francis, 2021)The magnetic nano-composites based on the tris(hydroxymethlmethyl) aminomethane-modified maleic anhydride-co-styrene copolymers and Fe3O4 nano-particles were prepared as new potential chelating agents for ultrasound-a ... -
Application of a novel poly(SMAm)-Tris-Fe3O4 nanocomposite for selective extraction and enrichment of Cu(I) /Cu(II) from beer, soft drinks and wine samples, and speciation analysis by micro-volume UV–Vis spectrophotometry
(ELSEVIER, 2021)In this study, a novel functional nanocomposite was synthesized, characterized and selectively used in pHcontrolled separation, pre-concentration and speciation analysis of Cu(I) and Cu(II) from sample matrices where ... -
A New Enrichment Method for Quantification of 5-Hydroxymethylfurfural by Indirect Flame Atomic Absorption Spectrometry in Honey and Jam Samples
(OXFORD UNIV PRESS INCJOURNALS DEPT, 2001 EVANS RD, CARY, NC 27513, 2021)Background: Because of increasing amounts of 5-hydroxymethylfurfural (5-HMF) in processed foods and the complexity of the matrix, monitoring of trace 5-HMF requires accurate and reliable methods. Hence, an efficient sample ... -
Half-inverse problems for the quadratic pencil of the Sturm–Liouville equations with impulse
(2021)In this paper, we consider the inverse spectral problem for the impulsive Sturm–Liouville differential pencils on [0, π] with the Robin boundary conditions and the jump conditions at the point 𝜋������ 2 . We prove ... -
Selective extraction and enrichment of 5-hydroymethylfurfural from honey, molasses, jam and vinegar samples prior to sensitive determination by micro-volume UV-vis spectrophotometry
(CADEMIC PRESS INC ELSEVIER SCIENCE525 B ST, STE 1900, SAN DIEGO, CA 92101-4495, 2021)In this study, a new method was developed for the extraction/enrichment of 5-hydroxymethylfurfural (5-HMF) from sample matrix prior to analysis. The method is based on the selective formation of the imine adduct and ionpair ... -
Investigations substituent effect on structural, spectral and optical properties of phenylboronic acids
(ELSEVIER, 2021)Ortho- and para-substituent arylboronic acid are investigated. Geometric structure and structural proper ties of these compounds are done. IR and NMR spectrum are calculated for the spectral characterizations. Contour ... -
Computational investigation of molecular structures, spectroscopic properties and antitumor-antibacterial activities of some Schiff bases
(ELSEVIER, 2021)Molecular structures, spectroscopic properties (IR, 1 H NMR and 13C NMR, UV-VIS), molecular electrostatic poten tial maps and some molecular properties (ionization energy, electron affinity, energy gap, hardness, electroneg ... -
Eco-friendly trace analysis of silver in beer/wine samples using a new co-polymeric nanocomposite based-ultrasound assisted-cloud point extraction combined with spectrophotometry
(ACADEMIC PRESS INC ELSEVIER SCIENCE525 B ST, STE 1900, SAN DIEGO, CA 92101-4495, 2021)In this study, a new magnetic nanocomposite based on the tris(2-hydroxymethyl)aminomethane-modified poly (styrene-co-N-maleimide) copolymer and Fe3O4 nanoparticles were prepared as a new micellar interface for preconcentration ... -
Equilibrium, Thermodynamic, and Density Functional Theory Modeling Studies for the Removal of Dichromate Ions from Wastewater Using Calix[4]arene Modified Silica Resin
(ACS, 2021)Water is contaminated by different toxicants such as anions, cations, and organic waste products. In this regard, this study reveals the removal of Cr2O7 ions from water using calix[4]arene modified silica (CMS) resin under ... -
1. ENERJİ GÜNLERİ SEMPOZYUMU
(2021)Son yıllarda nüfus ve gelişen teknoloji ile paralel olarak artış gösteren enerji ihtiyacı, tükenebilen kaynakların yerine kendini yenileyebilen enerji kaynaklarının kullanımını gündeme getirmiştir. Günümüz şartlarında ...