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Antioxidant Properties of Melanin from Testae of Armeniaca vulgaris var. ansu Accumulation Patterns of Total Flavonoids,Total Polyphenol during Growth of Zanthoxylum bungeanum Maxim.and Its Antioxidant Activities Ultrasonic-assisted Extraction of Polysaccharide from Eucommia ulmoides and Evaluation of its Antioxidant Activity