The findings of this study regarding the decomposition of isorhamnetin derivatives during SSF agree well with the findings of Moussa-Ayoub, El-Samahy, Kroh, and Rohn (2011), who reported that all isorhamnetin glycosides in cactus pear peels were hydrolyzed gradually to isorhamnetin by increasing the time of enzy- matic hydrolysis (using a mixture of pectinases and cellulases).