RCR (300 g) and WCR (300 g) were weighed and soaked in water (6:1, v/w) for 20 min respectively, then refluxed for 30 min and extracted twice. Finally, the extracts of RCR and WCR were filtered, combined, and concentrated to 1.20 g/mL respectively. The concentrated extracts were stored in a refrigerator at 4 °C before use.
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