Stability of resveratrol in the optimized resveratrol-loaded Zn-pectinate beads. Data represents mean ± SD. # represents p < 0.05 for the difference between 90 days and 0, 3, 7, 15, and 30 days; ## represent p < 0.05 for the difference between 180 days and 0, 3, 7, 15, 30, and 90 days; *p < 0.05 for the difference between 40°C and 4°C; and **p < 0.05 for the difference between 40°C and 4°C and RT