*2.4. 60Co-γ Irradiation*

The resulting curcumin EOs was dehydrated with anhydrous Na2SO4 and then divided into three equal parts for 60Co irradiation. The dose rates were 0, 5, and 10 kGy/min. The 60Co γ radiation source was located at Hunan Radiological Technology Application Research Center (Changsha, China).
