FT IR ATR Study of Molecular Interactions in the Urea/Dimethyl Sulfoxide and Urea/Diethyl Sulfoxide Binary Systems

Markarian, Shiraz A.; Gabrielyan, Lilit; Grigoryan, K. R.

doi:10.1023/b:josl.0000048050.47474.fc

Cited by 14 publications

(10 citation statements)

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“…Peak wavenumbers and their relative bond vibrations are reported in Table 1. For CS-based nanofibres, the appearance of the peak at 1074 cm -1 is related to the stretching of S=O bonds (νS=O) due to the presence of DMSO residues in the nanofibres, in accordance to results obtained by Markarian et al (Markarian, Gabrielyan, & Grigoryan, 2004). Furthermore, in the crosslinked nanofibres the crosslinking was confirmed by the appearance of peaks at 1059 cm -1 , 944 cm -1 and 858 cm -1 related to PO3 stretching (νPO3), O-P-O bending (δO-P-O) and P-OH bending (νP-OH), respectively (Larkin, 2011).…”

Section: Fourier Transform Infrared-attenuated Total Reflectance Spectroscopy (Ftir-atr)supporting

confidence: 90%

Non-covalently crosslinked chitosan nanofibrous mats prepared by electrospinning as substrates for soft tissue regeneration

Tonda‐Turo

Ruini

Ramella

et al. 2017

Carbohydrate Polymers

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Chitosan (CS) membranes obtained by electrospinning are potentially ideal substrates for soft tissue engineering as they combine the excellent biological properties of CS with the extracellular matrix (ECM)-like structure of nanofibrous mats. However, the high amount of acid solvents required to spun CS solutions interferes with the biocompatibility of CS fibres. To overcome this limitation, novel CS based solutions were investigated in this work. Low amount of acidic acid (0.5M) was used and dibasic sodium phosphate (DSP) was introduced as ionic crosslinker to improve nanofibres water stability and to neutralize the acidic pH of electrospun membranes after fibres soaking in biological fluids. Randomly oriented and aligned nanofibres (128±19nm and 140±41nm, respectively) were obtained through electrospinning process (voltage of 30kV, 30μL/min flow rate and temperature of 39°C) showing mechanical properties similar to those of soft tissues (Young Modulus lower than 40MPa in dry condition) and water stability until 7 days. C2C12 myoblast cell line was cultured on CS fibres showing that the aligned architecture of substrate induces cell orientation that can enhance skeletal muscle regeneration.

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Section: Fourier Transform Infrared-attenuated Total Reflectance Spectroscopy (Ftir-atr)supporting

confidence: 90%

Non-covalently crosslinked chitosan nanofibrous mats prepared by electrospinning as substrates for soft tissue regeneration

Tonda‐Turo

Ruini

Ramella

et al. 2017

Carbohydrate Polymers

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“…DMSO is a solvent of high solvating ability (DN = 29.8), and it can strongly compete with ligands such as crown ethers or cryptands for alkali-metal ion coordination. [28] A variety of theoretical and experimental studies on liquid DMSO, [30][31][32][33][34] water/DMSO mixtures, [35][36][37][38][39][40] DMSO/nonaqueous electrolyte solutions [41,42] and solutions of biomolecules in DMSO [43][44][45] have been performed in recent years to understand the physical properties of DMSO solutions. Solutions of alkalimetal ions, mostly Li + , in DMSO have also been investigated experimentally [46][47][48][49] and theoretically, [41,[50][51][52][53] as well as in water/ DMSO mixtures [54][55][56] and in other solvent combinations.…”

Section: Introductionmentioning

confidence: 99%

Ligand‐Exchange Processes on Solvated Lithium Cations: DMSO and Water/DMSO Mixtures

et al. 2007

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Solutions of LiClO(4) in solvent mixtures consisting of dimethylsulfoxide (DMSO) and water, or DMSO and gamma-butyrolactone, were studied by (7)Li NMR spectroscopy (for complexation by cryptands in gamma-butyrolactone as a solvent, see: E. Pasgreta, R. Puchta, M. Galle, N. J. R. van Eikema Hommes, A. Zahl, R. van Eldik, J. Incl. Phen., 2007, 58, 81-88). Chemical shifts indicate that the Li(+) ion is coordinated by four DMSO molecules. In the binary solvent mixture of water and DMSO, no selective solvation is detected, thus indicating that on increasing the water content of the solvent mixture, DMSO is gradually displaced by water in the coordination sphere of Li(+). The ligand-exchange mechanism of Li(+) ions solvated by DMSO and water/DMSO mixtures was studied using DFT calculations. Ligand exchange on [Li(DMSO)(4)](+) was found to follow a limiting associative (A) mechanism. The displacement of coordinated H(2)O by DMSO in [Li(H(2)O)(4)](+) follows an associative interchange mechanism. The suggested mechanisms are discussed in reference to available experimental and theoretical data.

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“…It dramatically changes the physicochemical characteristics (dielectric constant, refractive index, electrical conductivity, density, viscosity etc.) of binary solvents [7,8], thus affecting the fluorescence decay processes [9,10]. It can promote the formation of more rigid, conjugated molecular structures thus affecting the fluorescence quantum yield (Φf) of chromophore.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Dimethylsulfoxide on the Fluorescence Properties of Some 4-Hydroxyquinolines

Grigoryan¹,

Shilajyan²,

Aleksanyan³

et al. 2021

Proc. YSU B: Chem. Biol. Sci.

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Fluorescence properties of 4-hydroxy-2-methylquinoline (1) and 2-(5-mercapto-1,3,4-oxadiazol-2-yl)-6-methylquinoline-4-ol (2) were studied in dimethylsulfoxide (DMSO) aqueous solutions. The fluorescence properties of 1 and 2 exhibit substantial dependence on the DMSO concentration. The fluorescence quantum yield $(\Phi_f)$ of 1 decreases upon adding DMSO due to the shift in the keto-enol (E) tautomeric equilibrium toward E form․ On the contrary 2 demonstrates a tendency of increase of $\Phi_f$ upon adding DMSO due to intermolecular charge transfer from DMSO to the aromatic ring of quinoline, which increases the electron density on the ring and hence the fluorescence efficiency.

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FT IR ATR Study of Molecular Interactions in the Urea/Dimethyl Sulfoxide and Urea/Diethyl Sulfoxide Binary Systems

Cited by 14 publications

References 0 publications

Non-covalently crosslinked chitosan nanofibrous mats prepared by electrospinning as substrates for soft tissue regeneration

Non-covalently crosslinked chitosan nanofibrous mats prepared by electrospinning as substrates for soft tissue regeneration

Ligand‐Exchange Processes on Solvated Lithium Cations: DMSO and Water/DMSO Mixtures

The Effect of Dimethylsulfoxide on the Fluorescence Properties of Some 4-Hydroxyquinolines

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