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ON THE PHOTODECOMPOSITION OF CHLOROPHYLL IN VITRO ‐I. REACTION RATES *
Author(s) -
JEN J. J.,
MACKINNEY G.
Publication year - 1970
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.1751-1097.1970.tb06002.x
Subject(s) - pheophytin , chlorophyll , chlorophyll a , chemistry , photochemistry , reaction rate , absorption (acoustics) , photosynthesis , catalysis , organic chemistry , optics , biochemistry , physics , photosystem ii
— Chlorophyll solutions are irreversibly bleached by light in the presence of oxygen. The action spectra parallel the absorption spectra for both chlorophyll a and b. The reaction is of second order with a Q 10 of 1.26. The reaction rates for chlorophylls a and b are of the same order of magnitude. Depending upon the light source, the initial rate for chlorophyll a is slightly higher, by a factor of 1.15 to 1.30. The rate for pheophytin is lowe 3 by several orders of magnitude. No pheophytin has been detected in the reaction products of the irradiated chlorophyll solutions in the absence of water.