Optimizing the Solvent Selection of the Ultrasound-Assisted Extraction of Sea Buckthorn (<i>Hippophae rhamnoides</i> L.) Pomace: Phenolic Profiles and Antioxidant Activity.

The TFC in different extracts is presented in Figure 2 , with the highest TFC found in the 75% glycerol extract (25.52 ± 1.35 mg RTE/g) and the lowest in the 25% ethyl acetate extract (2.13 ± 0.28 mg RTE/g), showing highly significant differences among the various extract TFCs ( p < 0.001).

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As the concentration of ethyl acetate and petroleum ether increased, the TPC showed a decreasing trend, which may be due to the fact that ethyl acetate and petroleum ether extracted fewer phenolics, and the TPC may be mainly affected by the ethanol acting as a diluent in the extraction solvent.

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