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Quantum yield for the photo-degradation of vitamin D3

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Abstract

Ultraviolet radiation can photodegrade vitamin D3 to suprasterol I, superasterol II. and 5,6-transvitamin D3 The probability of the photodegradation of vitamin D3, after the absorption of one photon, is called the quantum yield. We estimated the quantum yield ϕ for all the degeneration reactions together on the basis of the results reported by Webb et at. (1989) for a degradation experiment on pure, tritiated vitamin D3 in methanol in sunlight. We find ϕ = (0.42 + 0.1). This value of the quantum yield can be used to estimate the kinetics contribution from vitamin D3 degradation in exposure experiments and model calculations.

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  1. RIVM, Bilthoven, The Netherlands

    Arjan van Dijk

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  1. Arjan van Dijk
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Correspondence to Arjan van Dijk.

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van Dijk, A. Quantum yield for the photo-degradation of vitamin D3. Photochem Photobiol Sci 16, 690–693 (2017). https://doi.org/10.1039/c6pp00393a

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