Imaging Science and Photochemistry ›› 2002, Vol. 20 ›› Issue (2): 126-130.DOI: 10.7517/j.issn.1674-0475.2002.02.126

Previous Articles     Next Articles

STUDIES ON THE LIFETIME OF M-STATE IN BACTERIORHODOPSIN FILM MODIFIED WITH CeO2 NANOCRYSTALLINE

WANG Li-ping1,2, LI Bao-fang1, HONG Guang-yan3, JIANG Long 1   

  1. 1. Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, P.R.China;
    2. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100101, P.R.China;
    3. Key Laboratory of Rare-earth Chemistry of Sciences, Changchun 130022, P.R.China
  • Received:2001-08-08 Revised:2001-09-19 Online:2002-03-23 Published:2002-03-23

Abstract: Bacteriorhodopsin,which consisted in the purple membrane,has unique photocycle and photochoromism properties and can be widely used in moleculer electronics and bioelectrotechnics.Bacteriorhodopsin polyvinyl alcohol (bR-PVA)films were prepared with CeO2 nanocrystallines as chemical additives.The effect of the nanocrystallines on the lifetime of M-state,which is an important intermediate in the photocycle of bR,is investigated.It is observed that the lifetime of M-state can be prolonged by rare-earth nanocrystalline,and the lifetime of M-state increases with the decreasing size of CeO2 nanocrystalline.Hydroxyl groups around the nanocrystallines help to prevent the Schiff base in the M-state from uptaking protons,and the decay rate is retarded and the lifetime of the M intermediate is prolonged.

Key words: bacteriorhodoposin, rare earth nanocrystalline, chemical modification, lifetime of intermediate state

CLC Number: