谱线
化学
拉曼散射
麦角新碱
氨基酸
硫黄
拉曼光谱
立体化学
生物化学
光学
有机化学
物理
天文
抗氧化剂
作者
Stefano Fornasaro,Elisa Gurian,Sofia Pagarin,Elena Genova,Gabriele Stocco,Giuliana Decorti,Valter Sergo,Alois Bonifacio
标识
DOI:10.1016/j.saa.2020.119024
摘要
Intense SERS spectra of the natural amino acid ergothioneine (ERG) are obtained on different substrates upon 785 nm excitation. A characteristic spectral pattern with a distinctive intense band at 480–486 cm−1 is conserved when substrates of different type and characteristics are used. On the basis of available literature, we propose ERG is adsorbed on the metal surface in its thiolate form via the sulphur and heterocyclic nitrogen. The same spectral pattern is obtained in SERS spectra of filtered erythrocytes lysates, confirming the presence of ERG in those cells. The occurrence of ERG bands in label-free SERS spectra of serum and plasma reported in literature by different authors is discussed, highlighting the importance of this amino acid for the interpretation of SERS spectra of these biofluids.
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