OPTIMIZATION OF ULTRASOUND-ASSISTED EXTRACTION CONDITIONS OF ANTIOXIDATIVE COMPONENTS FROM ARUNDINA GRAMINIFOLIA BY RESPONSE SURFACE METHODOLOGY BASED ON DPPH RADICAL SCAVENGING ASSAY - X. F. Li; Y. T. Gao; X. X. Pang; X. F. Liu; W. Y. Li; Y. L. Zhang; B. Y. Fan (Journal of Animal and Plant Sciences, 2015)