HJT herbal drink (448 g, Tongrentang, Beijing, China) was soaked in 1,000 ml of distilled water for 30 min and condensed and refluxed for 60 min. The filtrate was then collected and concentrated to 170 ml under reduced pressure in a rotary evaporator at 45°C to obtain a final HJT concentration of 2.64 g/ml. Finally, the HJT solution was diluted with water to concentrations of 0.66 and 1.32 g/ml.
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