Kinetic study on the photostability of solid vesnarinone and the equivalent relationship between daylight and...

The photostability of solid vesnarinone on exposure to daylight and lamplight was studied. The equivalent influences of light from different sources on the photostability of solid vesnarinone were observed. Results show that the relationship between the surface reflectance of solid vesnarinone and the cumulative illuminance of light from different sources can be accurately expressed by a curve fit, R = A + B(Et) + C/(Et + D); the daylight can be replaced by lamplight in photostability studies.