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XPS and ATR‐FTIR study on chemical modifications of cold atmospheric plasma (CAP) operated in air on the amino acids L‐proline and trans‐4‐Hydroxy‐ l ‐proline
Author(s) -
Scheglov Anna,
Helmke Andreas,
Loewenthal Leander,
Ohms Gisela,
Vioel Wolfgang
Publication year - 2018
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.201800078
Subject(s) - proline , hydroxyproline , amino acid , chemistry , x ray photoelectron spectroscopy , fourier transform infrared spectroscopy , biochemistry , chemical engineering , engineering
Amino acids L‐proline and trans‐4‐Hydroxy‐ l ‐proline were exposed to cold atmospheric plasma (CAP) generated by dielectric barrier discharge and operated in ambient air at dry conditions. Surface analysis reveals an oxygenation of both amino acids the degree of which is dependent on treatment time. NewN O 3 −or NO 2 groups are attached to the surfaces. Proline and hydroxyproline respond differently to the cold atmospheric plasma, proline being more prone to ring opening, fragmentation of the molecule, and attachment of COH and CO groups. Aging experiments show that plasma mediated attachment of new functional groups is, to a great degree, reversible over time.