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REDOX DYES AS ARTIFICIAL PHOTORECEPTORS IN LIGHT‐DEPENDENT CAROTENOID SYNTHESIS *
Author(s) -
LangFeulner J.,
Rau W.
Publication year - 1975
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1975.tb06649.x
Subject(s) - methylene blue , pigment , toluidine , carotenoid , blue light , chemistry , photochemistry , visible spectrum , red light , irradiation , redox , biophysics , biochemistry , biology , organic chemistry , botany , materials science , photocatalysis , optoelectronics , physics , nuclear physics , catalysis
— The photodynamically active dyes methylene blue, toluidine blue, and neutral red act as artificial photoreceptors in light‐dependent carotenoid synthesis in Fusarium aquaeductuum. Normally, carotenoid production is only induced by light of wavelengths shorter than 520 nm, but when mycelia are incubated with neutral red, methylene blue, and toluidine blue, red light is also effective in inducing carotenogenesis. Experiments with methylene blue and red light showed that pigments induced under these conditions are qualitatively the same as those induced with white light, and also that, in accord with the results found for photoinduction with white light, the amount of pigment synthesized was proportional to the logarithm of illumination time. In addition to their role in photoinduction, the dyes were also shown to interfere with the biosynthesis of carotenoids, whereas addition after irradiation caused an increase in pigment production that involves a quantitative change in the more unsaturated components.