Retention factor (RF) = (Content After Processing / Content Before Processing) * Yield factor

mean RF value min max SD n # of references
 
Phenolic acids - Hydroxycinnamic acids - Sinapic acid
Vegetables
Cabbages Kale, boiled, frozen 0.96 0.96 0.96 0 2 1
Kale, blanched, frozen 0.92 0.9 0.94 0.02 2 1