Stability of patulin at ph 6.0-8.0 and 25 degrees c.

Patulin was tested for stability at pH values of 6.0, 6.5, 7.0, 7.5, and 8.0, using Sörensen's phosphate buffer at 25 degrees C. Patulin was determined by high-performance liquid chromatography. When the percentage of patulin remaining was plotted versus reaction time, apparent first-order reaction plots were obtained. Reaction rate constants for disappearance of patulin ranged from 1.1 x 10(-2) h at pH 8.0-5.3 x 10(-4) h at pH 6.0. Values for half-life were calculated and ranged from 64 h at pH 8.0 to 1310 h at pH 6.0.