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. 2015 Feb 21;16(5):1122–1128. doi: 10.1208/s12249-015-0304-2

Table II.

Apparent First-Order Rate Constants for the Photolysis of Riboflavin (k obs) in Organic Solvents and Water

Solvents Acceptor number Dielectric constant (ϵ) (25°C) Inverse viscosity (mPa.s−1) (25°C) k obs × 103 min−1 ± SD
Ethyl acetate 17.1 6.02 2.268 3.19 ± 0.14
1-Butanol 36.8 17.8 0.387 3.28 ± 0.13
1-Propanol 37.3 20.1 0.514 3.34 ± 0.16
Ethanol 37.1 24.3 0.931 3.45 ± 0.15
Methanol 41.3 32.6 1.828 3.64 ± 0.17
Acetonitrile 18.9 38.5 2.898 3.81 ± 0.16
Water 54.8 78.5 1.123 4.61 ± 0.25

SD standard deviation