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Terenetskaya, I. P. (2008). Limitations of the photostationary approximation in the photochemistry of provitamin d: The ambiguous role of the irreversible degradation channel. Theoretical and Experimental Chemistry, 44(5), 286–291. 
Added by: Sarina (2017-01-20 15:54:17)   
Resource type: Journal Article
DOI: 10.1007/s11237-008-9043-8
ID no. (ISBN etc.): 1573-935X
BibTeX citation key: Terenetskaya2008
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Categories: Englisch = English
Creators: Terenetskaya
Collection: Theoretical and Experimental Chemistry
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Enthält Absorptionsspektren von 7DHC, preD3, Lumsteril, Tachysterol sowie Quanteneffizienzen

φ12 = 0.26 7DHC  preD3
φ21 = 0.015 preD3  7DHC
φ23 = 0.48 preD3  Tach
φ32 = 0.10 Tach  preD3
φ24 = 0.42 preD3  Lumi
φ42 = 0.03 Lumi  preD3
φ25 = 0.039 preD3  Tox

Added by: Sarina  Last edited by: Sarina
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.
Added by: Sarina  
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