| 1 | Author | Andre Buche | Requires cookie* |
| Title | Wavelength Shifts Correlation between Near Infrared and Ultraviolet Regions of the LHII Bacteriochlorophyll Spectrum from Ectothiorhodospira sp  | ||
| Abstract | Bacteriochlorophyll a has a maximum at 258 nm previously related to the ring E ester system interacting with the Ji-system of the macrocycle. In this work, we compared the effect o f lauryldimethylamine-N-oxide (LD AO) and alkaline pH on both the near infrared and the ultraviolet region of the LHII spectrum from E ctothiorhodospira sp. While LDAO induces only a shift of the 850 nm band arising from the Q y transition of the bacteriochlorophyll a, alkaline pH also causes a concomitant and reversible 10-nm shift from 258 to 248 nm. Both shifts have similar apparent pKs (12.3 and 12.6, respectively). Interestingly, the presence of NaCl reduces these pKs values to 11.4 and 11.7. | ||
| Reference | Z. Naturforsch. 56c, 363 (2001); received D ecem ber 11 2000/January 23 2001 | ||
| Published | 2001 | ||
| Keywords | Bacteriochlorophyll, Ectothiorhodospira, Light-Harvesting Complex | ||
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