Highlights
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Ethanol extracts of sweet variety tamarind seed showed natural antioxidant potential.
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Condition of 250 bar and 50 °C process optimization point.
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Supercritical extraction with ethanol increased yield and antioxidant quality.
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Kinetics study indicated that the main mass transfer mechanism is convection.
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The main component extracted by supercritical fluid (the 9,12-octadecadienoic acid).