Barely Significant

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The relative contents of these aldehydes increased at the end of frying, and with the extension of frying time, the relative contents of (E)-2-heptenal, (E,E)-2,4-heptadienal, (E)-2-octenal, (E)-2-decenal, and (E,E)-2,4-decadienal showed a trend of first increasing and then decreasing, and these enaldehydes and dienaldehydes were related to a pleasant deep-fried flavor.
Either continuously adding hesperetin into the PPO solution ( Figure 2 D) or continuously adding PPO into the hesperetin solution ( Figure 2 E), the added hesperetin did not react completely with PPO (and vice versa), so that free hesperetin or PPO existed in the system; the concentration profile of the PPO–hesperetin complex always showed an increasing trend.