The limitations of the generally accepted photostationary approximation in the photochemistry of provitamin D resulting from the strong spectral dependence of the effectiveness of the irreversible channel were established theoretically by a simplified model. The results show clearly that disregard of the irreversible channel with low quantum yield in a system of reversible photochemical reactions over a wide spectral range is not always justified. As a result the approximation according to which the concentration of the main photoisomers of provitamin D is constant only holds in a specific region of the spectrum, and this must be taken into account during concentration analysis of the photoisomeric mixture.
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Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 44, No. 5, pp. 279–283, September–October, 2006.
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Terenetskaya, I.P. Limitations of the photostationary approximation in the photochemistry of provitamin D: The ambiguous role of the irreversible degradation channel. Theor Exp Chem 44, 286–291 (2008). https://doi.org/10.1007/s11237-008-9043-8
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DOI: https://doi.org/10.1007/s11237-008-9043-8