Redox Properties of Some Aminoacids and Proteins

Abstract

In order to characterize redox properties of biomolecules, specific methods for evaluating the antioxidant capacity of some biological structures or their components (like aminoacids) are used, such as chemiluminescence (CL) and cyclic voltametry coupled with UV-VIS spectroscopy. The CL antioxidant capacity, the reduction potential (e 1=2 ), and the anodic current intensity (I a ) have been determined by controlling the behavior of the compounds under redox conditions. The value of the half-wave potential of the first peak was correlated with the reduction tendency on the electrode, and this behavior was analyzed in relation to the antioxidant capacity observed by CL.

Combined NMR and Computational Study of Cysteine Oxidation during Nucleation of Metallic Clusters in Biological Systems

“…These requirements can easily be met in the complex environments of cytoplasm and extracellular matrix. Glutathione (GSH), reduced nicotinamide adenine dinucleotide phosphate (NADPH), guanine residues, tryptophan, heme proteins, thiols under certain conditions, , ascorbic acid, and catecholamines can be considered as potential reducing agents in the human body. Also, ions trapped in the skin may be transformed through photoreduction. , De novo NPs formation under in vivo settings was evidenced in bacteria, while the presence of reducing agents in biological media and/or tissues has been utilized in biogenic NP synthesis with extracts from bacteria and fungi, human gut microbiota, plants, marine organisms, and animals …”

Organic Solar Cell Performance of Musa acuminata bracts Extract by Microwave Irradiation Treatment

“…No sharp peaks were found. The shape of the voltammogram curves of the banana flower extract anthocyanins is almost the same as the voltammogram curves of phenylalanine, histidine, and tryptophan 35 . The higher the initial scan rate, the smaller the initial current generated.…”

“…The anthocyanin absorption spectrum extracted from Musa acuminata bracts is at wavelengths of 400 nm to 650 nm, this is under the results of Al‐Alwani et al (2017) 30 . The maximum light absorption by anthocyanin in this study, 1.55 a.u., was higher when compared to light absorption in eggplant leaf anthocyanins, 1.00 a.u 4,35 …”

“…30 The maximum light absorption by anthocyanin in this study, 1.55 a.u., was higher when compared to light absorption in eggplant leaf anthocyanins, 1.00 a.u. 4,35 The voltammogram curves in Figure 4A show the relationship of generated electric current at scan rates between 20 mV/s to 180 mV/s with increments of 40 mV/s. Cyclic scans were made at the applied potential between 0 and 1 V. At the lowest scan rate (20 mV/s), the generated initial current shows the highest value (11.46 μA) among all.…”

“…The shape of the voltammogram curves of the banana flower extract anthocyanins is almost the same as the voltammogram curves of phenylalanine, histidine, and tryptophan. 35 The higher the initial scan rate, the smaller the initial current generated. On a positive scan between 0.2 V to 0.4 V, a weak peak appears, and as the applied scan rate increases, the generated peak current shifts to the left as well.…”