Evaluation of the Effect of Ultrasonic Pretreatment on the Drying Kinetics and Quality Characteristics of <i>Codonopsis pilosula</i> Slices Based on the Grey Correlation Method.

The total phenolic content showed a trend of increasing and then decreasing with the extension of the pre-treatment time, reaching the highest level (0.826 mg/g) at 30 min of action, but lower than the total phenolic content in the slices of the control group without pretreatment, indicating that the retention of total phenolic substances in the slices of CP could be increased by appropriately prolonging the pre-treatment time.

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Total flavonoid content showed a decreasing trend with increasing US power, which may be due to the fact that high intensity ultrasound is more likely to break the covalent bonds between polymers and promote the release of flavonoids; however, the released flavonoids are easily oxidized and cause loss [ 30 ].

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