The influence of water activity on the stability of vulgaxanthin I

The stability of vulgaxanthin I at 100 degrees C is dependant on the water activity of the system. The half-life of vulgaxanthin I was found to be three times greater at aw 0.20 than at 1.00. The rate constants for vulgaxanthin I degradation varied exponentially with respect to water activity and below aw = 0.50 the stability was not improved.