Alcoholic extracts have a high extraction power of ascorbic acid compared with the aqueous ones.
Maximum myricetin content was obtained at the highest extraction power and reached the maximum value at 33.79 % of extraction power in the fixed extraction time of 18.13 min.
Furthermore, the recovery was negatively affected by ethanol concentrations higher than 40% and additional extraction power.
Maximum rutin content was obtained at the highest extraction time in the fixed extraction power of 53.24 %.
In order to verify the rutin and quercetin contents simultaneously from peach extracts, there was one optimal extraction conditions, which was established to get the highest values: modifying the extraction temperature of 41.08 °C to 40 °C, extraction power of 53.09 % to 50%%, and extraction time of 23.68 min to 24 min.
Maximum myricetin content was obtained at the highest extraction temperature and reached the maximum value at 38.98 °C of extraction temperature in the fixed extraction power of 33.79 %. Figure 6b shows the effect of the interaction of extraction temperature and extraction time on the myricetin content at a fixed extraction power of 0 level.
The effect of process variables (extraction temperature (°C), extraction power and extraction time (min)) on ultrasound-assisted extraction (UAE) were examined by using BBD and RSM.
Extraction yield was related with four variables, including ratio of solution to solid, extraction power, buffer time, and extraction time.
The optimal conditions for the highest extraction yield of HRLP were: ultrasonic power, 93.59 W; extraction time, 25.71 min; extraction temperature, 93.18 °C; and the water to raw material ratio, 24.3 mL/g.
The optimal conditions to obtain the highest extraction of APH (18.19 ± 0.26%) were as follows: microwave power, 330 W; extraction time, 80.67 min and extraction temperature, 82 °C.
