Physical Chemical Processes of Acetone Triplet with Aromatic Amino Acid-containing Peptides

Chem. J. Chinese Universities ›› 2000, Vol. 21 ›› Issue (12): 1880.

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Physical Chemical Processes of Acetone Triplet with Aromatic Amino Acid-containing Peptides

SONG Qin-Hua, CHU Gao-Sheng, LIN WeiZhen, YAO SiDe

1. Department of Chemistry, University of Science and Technology of China, Hefei 230026, China;
2. Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China;
3. Laboratoryof Radiation Chemistry, Shanghai Instituteof Nuclear Research, Chinese Academy of Sciences, Shanghai 201800, China

Received:1999-08-11 Online:2000-12-24 Published:2000-12-24

Abstract

Abstract: The photochemical processes of triplet acetone with aromatic amino acid containing peptides were investigated in neutral aqueous solution using KrF(248 nm) laser flash photolysis.In the presence of acetone, the formation of excited triplet states of tryptophan residues and radicals(Trp/N^·) via a-triplet-triplet( T-T ) energy transfer and an electron transfer respectively, was observed in case of Trp Phe, Trp Gly and n-formyl-Met-Trp, while only phenolic hydroxy radical(Tyr/O^·), via an electron transfer, was observed in case of Phe Tyr.Furthermore, triplet acetone induced radical transformation: Trp/N^· Tyr→-Trp Tyr/O^· was observed directly, and the transformation resulting from intramolecular electron transfer was suggested

Key words: Aromatic amino acid-containing peptide, Laser flash photolysis, Electron transfer

CLC Number:

O643.12

TrendMD:

SONG Qin-Hua, CHU Gao-Sheng, LIN WeiZhen, YAO SiDe. Physical Chemical Processes of Acetone Triplet with Aromatic Amino Acid-containing Peptides[J]. Chem. J. Chinese Universities, 2000, 21(12): 1880.

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Physical Chemical Processes of Acetone Triplet with Aromatic Amino Acid-containing Peptides

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