Table 4a shows the changes in a* values for different treatments during storage. Statistical analyses showed that interactions of factors (including two and three factors) were not significantly important. However, main effects of storage time and ultrasound power were statistically significant (Tables 4b and 4c). After one week of storage, a* values of strawberry dropped distinctly, and remained steady in the second and third weeks (Table 4b). It is possible that 90 W treatment had adverse effect on the anthocya-nins stability of strawberry due to cavitations including the formation of hydroxyl radicals ( Tiwari, Patras, Brunton, Cullen, & O’Donnell, 2010).