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• W2891977360 abstract "The oxidation of proteins results in their deterioration via the oxidation of reactive amino acids. Oxidation of the amino acid, methionine plays an important role during biological conditions of oxidative stress, and equally a role in protein stability. In this study the oxidation of the methionine residue using the tripeptide GlyMetGly with respect to hydrogen peroxide has been studied using both Raman spectroscopy and DFT calculations. Spectral modifications following the formation of methionine sulfoxide are shown with the appearance of the SO vibration whilst there is also the modification of the CS vibrations at approximately 700 cm−1. The changes in the intensity of the CS stretching band were used to calculate the kinetic rate constant as 7.9 ± 0.6 × 10−3 dm3 mol−1 s−1. The energy barrier for the reaction. is determined both experimentally and using DFT calculations. The reaction of the dairy protein beta-lactoglobulin with hydrogen peroxide is equally studied using the same technique. The solvent accessible surface area of the methionine residues within the protein were also determined and a comparison of the reaction rate constant and the energy barriers of reaction for the oxidation of the tripeptide and for the protein respectively thus, provides information about the role of the protein environment in the oxidation process." @default.
• W2891977360 created "2018-09-27" @default.
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• W2891977360 date "2018-11-01" @default.
• W2891977360 modified "2023-10-18" @default.
• W2891977360 title "Methionine oxidation by hydrogen peroxide in peptides and proteins: A theoretical and Raman spectroscopy study" @default.
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• W2891977360 doi "https://doi.org/10.1016/j.jphotobiol.2018.09.009" @default.
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