FTIR spectroscopy of cysteine as a ready-to-use method for the investigation of plasma-induced chemical modifications of macromolecules

高分子 傅里叶变换红外光谱 半胱氨酸 光谱学 等离子体 化学 化学工程 纳米技术 材料科学 有机化学 生物化学 物理 工程类 量子力学
作者
Friederike Kogelheide,Konstantin Kartaschew,Martin Strack,Sabrina Baldus,Nils Metzler‐Nolte,Martina Havenith,Peter Awakowicz,Katharina Stapelmann,Jan‐Wilm Lackmann
出处
期刊:Journal of Physics D [IOP Publishing]
卷期号:49 (8): 084004-084004 被引量:66
标识
DOI:10.1088/0022-3727/49/8/084004
摘要

A rapid screening method for the investigation of plasma-induced chemical modifications was developed by analyzing cysteine using Fourier Transform Infrared (FTIR) spectroscopy. Cysteine is a key amino acid in proteins due to the presence of a thiol group which provides unique structural features by offering the possibility to form disulfide bonds. Its chemical composition makes cysteine a well-suited model for the investigation of plasma-induced modifications at three functional groups—the amino, the carboxyl and the thiol group—all highly abundant in proteins. FTIR spectroscopy is present in most physical laboratories and offers a fast way to assess changes in the chemical composition of cysteine substrates due to plasma treatment and to compare different treatment conditions or plasma sources with each other. Significant changes in the fingerprint spectra of cysteine samples treated with a dielectric barrier discharge (DBD) compared to untreated controls were observed using a FTIR spectrometer. The loss of the thiol signal and the simultaneous increase of bands originating from oxidized sulfur and nitrogen species indicate that the thiol group of cysteine is modified by reactive oxygen and nitrogen species during DBD treatment. Furthermore, other plasma-induced modifications, such as changes of the amino and carbonyl groups, could be observed. Complementary mass spectrometry measurements confirmed these results.
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