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Luminescence and Raman Spectroscopic Characterization of Tyrosine Oxidized by Persulfate

机译：过硫酸盐氧化酪氨酸的发光和拉曼光谱表征

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To gain insight into the photochemistry of oxidized amino acids, the authors have measured chemiluminescence and Raman spectra of persulfate oxidized tyrosine (Potassium Bromide). Chemiluminescence kinetics were obtained from a sealed capillary tube containing a basic (Potassium Bromide) solution. Excitation at 488.0 nm and monitoring emission at 633 nm produced a first-order rise and a second-order decay in intensity to steady-state levels. The authors collected steady- state mission spectra from a flow system excited by argon-ion and helium-neon laser radiation. The full width at half- maximum position, and intensity of fluorescence were measured. The full-width at half-maximum was independent of excitation wavelength. At higher-energy excitation, the emission maximum was independent of excitation line. At lower energy excitation, the emission maximum varied with the excitation line. The emission intensity dropped by a factor of 6 as the excitation wavelength was varied from 465.8 nm to 514.5 nm. Luminescence was also observed upon excitation at 632.8 nm of this compound dissolved in DMSO. Raman data, obtained from solid poly-mer suspended in a KBr pellet, revealed broad bands superimposed upon a weak fluorescent background. Upon ultraviolet laser excitation (363.8nm, 5mW power on the sample, 5 cm 1 bandpass), a single broad band appeared, centered at 1300 cm. The difference from visible excitation implies that resonance enhancement from an ultraviolet absorbing chromophore occurred. Keywords: Tryosine oxidation; Raman; Fluorescence; Chemiluminescence; Phototransients; Reprints.

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