However, when the extraction time exceeded 2 min, the oil yield showed a decreasing trend instead.
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Extraction of tiger nut oil using ultrasound-assisted immiscible binary solvents and its effect on the quality of extracted oil and starch.
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The sentences
The oil yield showed a trend of increasing and then decreasing with the increase in extraction temperature and the maximum value (21.81 ± 0.18 %) was obtained at 30 °C.