In addition, the P -values of the linear coefficients ( X 1 , X 2 and X 3 ), and the quadratic term coefficients ( X 1 2 , X 2 2 and X 3 2 ) were lower than 0.01, which indicated the highly significant effects of these items on the extraction yield of CPP.
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Extraction optimization and influences of drying methods on antioxidant activities of polysaccharide from cup plant (Silphium perfoliatum L.).
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