How does the re-extraction process with 96.2% ethanol affect the recovery of tocopherols and tocotrienols from Hypericum perforatum L. inflorescences?

Label:chem

Topic
After the initial extraction using hydroethanolic solutions, the study investigated whether re-extraction with 96.2% ethanol could recover additional tocopherols and tocotrienols from the residues.

From: "Tocopherol and tocotrienol homologue recovery from Hypericum perforatum L. and extraction residues after hydroethanolic extraction", Industrial Crops and Products, Volume 224, February 2025, 120321
Answer
Re-extraction with 96.2% ethanol allowed for complete recovery of δ-T3 from H. perforatum. The residues from the first extraction using hydroethanolic solutions below 70.0% ethanol were a good source of tocotrienols, which were successfully re-extracted using 96.2% ethanol with the assistance of ultrasound treatment. This indicates that re-extraction can significantly improve the overall recovery of tocotrienols.
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