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Long pepper (LP), soursop (SS), green vein kratom (GK), and red vein kratom (RK) leaf ethanolic extracts were prepared using an ultrasonic device, followed by dechlorophyllization by the sedimentation process. Antioxidant and antimicrobial activities of the extracts were studied. Highest yield and total phenolic content were found in RK extract (P < 0.05). In general, RK extract showed the lowest...
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