期刊
JOURNAL OF PHYSICAL CHEMISTRY B
卷 112, 期 40, 页码 12859-12862出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp807149a
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资金
- INTAS [05-100000-8070]
- RFBR [08-03-00539, 06-03-32993]
- SB RAS [NSch-4821.2006.3]
- Presidium of SB RAS
- EU FP6 Marie Curie Actions program [IIF 22008]
The photochemical reaction between glycylglycine and triplet 4-carboxybenzophenone has been investigated using time-resolved chemically induced dynamic nuclear polarization (CIDNP). It is shown that the mechanism of the peptide reaction with triplet excited carboxybenzophenone is electron transfer from the amino group of the peptide, leading to the formation of an aminium cation radical that deprotonates to a neutral aminyl radical. Simulation of the CIDNP kinetics leads to an estimation of the paramagnetic relaxation time for the alpha-protons at the N-terminus at 20 to 40 mu s with the best-fit value of 25 mu s.
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