Abstract

Investigation of the influence of pH level of the environment on the dynamics of photoinduced changes in bacteriorhodopsin films was carried out. The studies were carried out with consequent impact of environments with different pH on one film and with parallel impact of environments with different pH on different films of one series. It is shown that at short-term action of alkaline environment an increase in the lifetime of intermediate M₄₁₂ is observed. In neutral and acidic environments no such effect was observed. Immersion of the film exposed to alkaline environment influence, into the acid one leads to time reduction in photocycle passage and reverse recovery of the film original characteristics. Based on the obtained results, a mechanism of pH impact on optical properties of film structures on the basis of bacteriorhodopsin has been suggested

Keywords: bacteriorhodopsin, pH, film structures, photo-induced changes, photocycle, intermediate

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