Thermal stability of dried photosynthetic membrane film for photoelectrodes

Thermal stability was examined on a photoelectrode made from dried film of a photosynthetic membrane (chromatophore) isolated from a photosynthetic bacterium Rhodopseudomonas viridis. Below 60°C, neither the optical absorbance of the film nor its photoelectric response were affected when heated for...

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Bibliographic Details
Published in:Materials Science & Engineering C 1994-02, Vol.1 (2), p.63-67
Main Authors: Miyake, Jun, Majima, Toshikazu, Namba, Keiichi, Hara, Masayuki, Asada, Yasuo, Sugino, Hiroaki, Ajiki, Shu-ichi, Toyotama, Hideki
Format: Article
Language:English
Subjects:
Biological and medical sciences
Biotechnology
Fundamental and applied biological sciences. Psychology
Mission oriented research
Prospectives
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Summary:Thermal stability was examined on a photoelectrode made from dried film of a photosynthetic membrane (chromatophore) isolated from a photosynthetic bacterium Rhodopseudomonas viridis. Below 60°C, neither the optical absorbance of the film nor its photoelectric response were affected when heated for 1 h. When the temperature was raised over 120 °C, both the absorbance and the response were lost. The temperature of half-denaturation of the chromatophore was 90 °C. X-ray diffraction of the film showed that heating did not cause the complete denaturation of the proteins of chromatophores. Heating did not destroy the secondary structure ( α-helix) of the proteins but the bundles of α-helices were distorted.
ISSN:0928-4931
1873-0191
DOI:10.1016/0928-4931(94)90056-6