Application of an optimized electrochemical sensor for monitoring astaxanthin antioxidant properties against lipoperoxidation

Penu, Ramona; Liţescu, Simona Carmen; Eremia, Sandra A. V.; Vasilescu, Ioana; Radu, Gabriel Lucian; Giardi, Maria Teresa; Pezzotti, Gianni; Rea, Giuseppina

doi:10.1039/c5nj00457h

Cited by 7 publications

(2 citation statements)

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“…One the one hand, the high photostability and non-toxicity of semiconductors and, on the other hand, the wide absorption range and low costs of organic dyes attracted great research interests for decades (Lang et al, 2014;Nalzala Thomas et al, 2021). However, the rapid recombination of photogenerated electron-hole pairs and the resulting low photoefficiency of semiconductors as well as the low photostability of organic dyes limit their applicability (Cao et al, 2015;Penu et al, 2015;Chen et al, 2018;Nalzala Thomas et al, 2021;Dong et al, 2022). Therefore, due to the tunable redox and excited state properties of transition-metal complexes, there is an intensive search for efficient and robust transition-metal based photosensitizers (Eckenhoff and Eisenberg, 2012;Frischmann et al, 2013;Berardi et al, 2014;Yuan et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

How the Way a Naphthalimide Unit is Implemented Affects the Photophysical and -catalytic Properties of Cu(I) Photosensitizers

et al. 2022

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Driven by the great potential of solar energy conversion this study comprises the evaluation and comparison of two different design approaches for the improvement of copper based photosensitizers. In particular, the distinction between the effects of a covalently linked and a directly fused naphthalimide unit was assessed. For this purpose, the two heteroleptic Cu(I) complexes CuNIphen (NIphen = 5-(1,8-naphthalimide)-1,10-phenanthroline) and Cubiipo (biipo = 16H-benzo-[4′,5′]-isoquinolino-[2′,1′,:1,2]-imidazo-[4,5-f]-[1,10]-phenanthroline-16-one) were prepared and compared with the novel unsubstituted reference compound Cuphen (phen = 1,10-phenanthroline). Beside a comprehensive structural characterization, including two-dimensional nuclear magnetic resonance spectroscopy and X-ray analysis, a combination of electrochemistry, steady-state and time-resolved spectroscopy was used to determine the electrochemical and photophysical properties in detail. The nature of the excited states was further examined by (time-dependent) density functional theory (TD-DFT) calculations. It was found that CuNIphen exhibits a greatly enhanced absorption in the visible and a strong dependency of the excited state lifetimes on the chosen solvent. For example, the lifetime of CuNIphen extends from 0.37 µs in CH2Cl2 to 19.24 µs in MeCN, while it decreases from 128.39 to 2.6 µs in Cubiipo. Furthermore, CuNIphen has an exceptional photostability, allowing for an efficient and repetitive production of singlet oxygen with quantum yields of about 32%.

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Section: Introductionmentioning

confidence: 99%

How the Way a Naphthalimide Unit is Implemented Affects the Photophysical and -catalytic Properties of Cu(I) Photosensitizers

et al. 2022

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“…vulgare L. species have been widely used in food technology because of their high concentrations of phenylpropanoid and aromatic monoterpene species, which have effective antimicrobial and antioxidant activities. , Several of these constituents can act as complexing agents, stabilizing the free transition metal ions and preventing the oxidation processes by Fenton reactions. ,,− Some information can be found in the literature regarding chemical reaction mechanisms that involve the chelating activity of essential oils in food.…”

Section: Introductionmentioning

confidence: 99%

Antioxidant and Cytotoxic Activity of Essential Oils and Their Principal Components: Spectrophotometric, Voltammetric, and Theoretical Investigation of the Chelating Effect of Eugenol and Carvacrol

Ferreira

Militani

Almeida

et al. 2023

ACS Food Sci. Technol.

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The antioxidant and chelating properties of essential oils of Syzygium aromaticum L. and Origanum vulgare L. and their principal eugenol and carvacrol constituents were evaluated by the thiobarbituric acid reactive substance (TBARS) assay and in the presence of iron(II) ions by cyclic voltammetry. In the TBARS assay, carvacrol and eugenol were more efficient than the butylated hydroxytoluene (BHT) standard. The anodic current of iron(II) decreased by 99.7% in the presence of S. aromaticum oil, 99.8% for eugenol, 89.3% for O. vulgare, and 99.4% for carvacrol. The UV spectra contained a band at 390 nm for the interaction between Fe(II) and ligands. Thermodynamically stable complexes are formed in the ratios of 1:3 Fe(II)/eugenol and 1:2 Fe(II)/ carvacrol. The essential oils and their principal constituents eugenol and carvacrol can be used in food preservation because they have a low cytotoxicity and act as antioxidants through chelation of metal ions.

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Nanotechnology-enabled approaches for the detection of antioxidants by spectroscopic and electrochemical methods

Rauhut

Bülbül

Andreescu

2017

Measurement of Antioxidant Activity &Amp; Capacity

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Application of an optimized electrochemical sensor for monitoring astaxanthin antioxidant properties against lipoperoxidation

Abstract: This paper reports the first renewable electrochemical sensor that is able to provide reliablein vitroinformation on carotenoid antioxidant properties by mimicking their natural position and orientation in the cellular membrane.

Cited by 7 publications

References 54 publications

How the Way a Naphthalimide Unit is Implemented Affects the Photophysical and -catalytic Properties of Cu(I) Photosensitizers

How the Way a Naphthalimide Unit is Implemented Affects the Photophysical and -catalytic Properties of Cu(I) Photosensitizers

Antioxidant and Cytotoxic Activity of Essential Oils and Their Principal Components: Spectrophotometric, Voltammetric, and Theoretical Investigation of the Chelating Effect of Eugenol and Carvacrol

Nanotechnology-enabled approaches for the detection of antioxidants by spectroscopic and electrochemical methods

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