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Pilot-scale extraction of polyphenols from spent black tea by semi-continuous subcritical solvent extraction

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Title: Pilot-scale extraction of polyphenols from spent black tea by semi-continuous subcritical solvent extraction
Authors: Rajapaksha, Surakshi1 Browse this author
Shimizu, Naoto2 Browse this author →KAKEN DB
Keywords: Non-extractable polyphenols
Antioxidant activity
Tea waste
Biomass
Issue Date: 31-Dec-2021
Publisher: Elsevier
Journal Title: Food Chemistry: X
Volume: 13
Start Page: 100200
Publisher DOI: 10.1016/j.fochx.2021.100200
Abstract: Spent black tea (SBT) is a residue from tea beverage production and considered as a potential source of active polyphenols. This study aimed to develop a pilot-scale process on semi-continuous subcritical solvent extraction (SSE) of polyphenols from SBT by exploiting the lab-scale knowledge. Treatment of SBT with ethanol-water (50% w/w) as solvent at 125 degrees C and 0.3 MPa achieved a significantly higher yield of polyphenols (80.82 g gallic acid equivalents/kg black tea) with antioxidant activity (64.20 g gallic acid equivalents/kg black tea), compared to hot water extraction (HWE). SSE increased the soluble matter content in extracts than HWE. Based on the results of LC-MS, theaflavin-3,3 '-digallate was the most abundant polyphenol from a total of 12 compounds to be extracted by SBT with 50% ethanol. The results suggested that SSE can be used as a scale-up extraction method to recover polyphenols from SBT.
Type: article
URI: http://hdl.handle.net/2115/85567
Appears in Collections:北方生物圏フィールド科学センター (Field Science Center for Northern Biosphere) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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