Spectroscopic studies of alpha tocopherol interaction with a model liposome and its influence on oxidation dynamics

Krilov, Dubravka; Kosović, Marin; Serec, Kristina

doi:10.1016/j.saa.2014.03.087

Cited by 15 publications

(6 citation statements)

References 17 publications

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“…Man et al [86], Silva et al [87], Krilov et al [88] and Valderrama [89] showed the characteristic absorption band of pure α-tocopherol at the wavelengths of 3473 cm −1 for the −OH stretching band, while 2927 and 2868 cm −1 belong to the symmetric and asymmetric stretching vibrations of CH 2 and CH 3 , respectively. Furthermore, 1461 cm −1 indicates the asymmetric bending of the phenyl skeleton and methyl group (1460 cm −1 ), 1378 cm −1 the symmetric bending of the methyl group, 1262 cm −1 , −CH 2 , 1086 cm −1 for plane bending of phenyl group and 919 cm −1 for trans = CH 2 stretching.…”

Section: Atr-ftir Analysismentioning

confidence: 99%

A Synergistic Effect between Stearic Acid and (+)-α-Tocopherol as a Green Inhibitor on Ferritic Stainless Steel Corrosion Inhibition in 3.0% NaCl Solution

Fuchs–Godec

2021

Coatings

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The synergistic inhibitory effect of stearic acid and (+)-α-tocopherol (E307) as a green inhibitor within a highly hydrophobic layer on the corrosion of low-carbon ferritic stainless steels was investigated in 3.0 wt% NaCl solution at 25 °C, focusing on long-term immersion tests. For a broader characterisation of the surface properties, especially the modified surfaces, of the samples used, the following methods were chosen: SEM was used to investigate the surface morphologies, the water contact angle to examine the wettability, while the corrosion resistance was investigated by potentiodynamic measurements and electrochemical impedance spectroscopy. The inhibition efficiency for modified ferritic stainless steel surfaces reached more than 99% after 1 h of immersion and remained the same after 5 days immersion testing when the surfaces were modified with (SA + 2.0 wt% E307) and more than 97% with (SA + 0.5 wt% E307) under the same test conditions.

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Section: Atr-ftir Analysismentioning

confidence: 99%

A Synergistic Effect between Stearic Acid and (+)-α-Tocopherol as a Green Inhibitor on Ferritic Stainless Steel Corrosion Inhibition in 3.0% NaCl Solution

Fuchs–Godec

2021

Coatings

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“…At a temperature below the transition temperature, the bilayer is rigid and impermeable, but above this temperature, it is flexible and permeable. A number of methods have been used to study these transitions, including 13 C-NMR, EPR [ 17 ] and FTIR [ 18 ], which have provided insight into the formed structure and its rigidity. Based on the fluorescence and anisotropy methods, Mason suggested that the TS in DPPC changes its thermotropic parameters due to the presence of a four-carbon chain moiety that increases the overall length of the molecule and shifts the chromanol ring deeper into the bilayer [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Tocopheryl Succinate-Induced Structural Changes in DPPC Liposomes: DSC and ANS Fluorescence Studies

et al. 2020

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Recent studies show that alpha-tocopheryl succinate (TS) exhibits selective toxicity against cancer cells. In this study, we investigated the effect of TS’s presence on the physico-chemical and structural properties of DPPC liposomes using fluorescence parameters (intensity, lifetime, and position of emission maximum) of 1-anilino-8-naphtalene sulphonate (ANS), differential scanning calorimetry (DSC) and zeta potential methods. Increasing the TS presence in the DPPC gel phase produced ANS fluorescence enhancement with a hypsochromic shift of the maximum. The zeta potential measurements show an increase in the negative surface charge and confirmed that this process is connected with the hydrophobic properties of dye, which becomes located deeper into the interphase region with a progressing membrane disorder. Temperature dependence studies showed that an increase in temperature increases the ANS fluorescence and shifts the ANS maximum emission from 464 to 475 nm indicating a shift from hydrophobic to a more aqueous environment. In the liquid crystalline phase, the quenching of ANS fluorescence occurs due to the increased accessibility of water to the ANS located in the glycerol region. The DSC results revealed that increasing the presence of TS led to the formation of multicomponent DSC traces, indicating the formation of intermediate structures during melting. The present results confirmed that TS embedded into the DPPC membrane led to its disruption due to destabilisation of its structure, which confirmed the measured biophysical parameters of the membrane.

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“…The chemical composition and binding states of the prepared hydrophobic layers were investigated in our previous study FTIR-ATR, in which we also confirmed the presence of alpha-tocopherol (E307) in the modified surfaces AISI 410S SS [ 27 ]. Several authors have confirmed the characteristic absorption bands of pure alpha-tocopherol at the following wavenumbers ( Table 3 ) [ 68 , 69 , 70 , 71 , 72 , 73 , 74 ]:…”

Section: Resultsmentioning

confidence: 89%

Flower-like Superhydrophobic Surfaces Fabricated on Stainless Steel as a Barrier against Corrosion in Simulated Acid Rain

Fuchs-Godec

2022

Materials

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Functionalisation of the metal surface of low-carbon ferritic stainless steel (from hydrophilic to hydrophobic properties) was achieved by flower-like hierarchical structures on a steel substrate prepared by a low-cost immersion method. The flower-like structured hydrophobic layers on the steel substrate were obtained by immersing the samples in an ethanolic solution of stearic acid with the addition of various concentrations of expired vitamin E ((+)α-tocopherol). The stability and corrosion-inhibiting effect of the hierarchically structured (such as natural cornflower) hydrophobic layers were studied systematically during short and long immersion tests, 120 h (five days) in an acidic environment (pH = 3) using potentiodynamic measurements, electrochemical impedance spectroscopy and chronopotentiometry. The surfaces of the samples, their wettability, surface morphology and chemical composition were characterised by contact angle measurements, SEM, ATR-FTIR and EDAX. After 120 h of immersion, the inhibition efficiency of the flower-like structured hydrophobic layers on the steel substrate in the selected corrosion medium remained above 99%, and the hierarchical structure (flower-like structure) was also retained on the surface.

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Spectroscopic studies of alpha tocopherol interaction with a model liposome and its influence on oxidation dynamics

Cited by 15 publications

References 17 publications

A Synergistic Effect between Stearic Acid and (+)-α-Tocopherol as a Green Inhibitor on Ferritic Stainless Steel Corrosion Inhibition in 3.0% NaCl Solution

A Synergistic Effect between Stearic Acid and (+)-α-Tocopherol as a Green Inhibitor on Ferritic Stainless Steel Corrosion Inhibition in 3.0% NaCl Solution

Tocopheryl Succinate-Induced Structural Changes in DPPC Liposomes: DSC and ANS Fluorescence Studies

Flower-like Superhydrophobic Surfaces Fabricated on Stainless Steel as a Barrier against Corrosion in Simulated Acid Rain

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