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Extraction of TAS from finely ground sample was carried out by ultrasonic-assisted extraction in small columns. Polyethylene frits were placed at the end of each glass column next to a filter paper circle. Subsequently, 3 g of sample and 20 ml of absolute ethanol were added and the columns were immersed into the ultrasonic water bath at 80 ¡ãC.  ÖÐPolyethylene frits  ÊÇʲôÒâ˼£¬ËûÔÚ³¬Éù²¨ÖÐÆðʲô×÷ÓÃÄØ£¬ÓÐÄǸöÅóÓѰïæ½âÊÍÒÔÏ¡£

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