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(a) The PLS biplot describing the correlation of MD2 pineapple peel, crown and core extracted with 0, 50 and 100% ethanol ratio and biological activities. See Table 1 for the assignments of metabolites. (b) Metabolites with variable importance in the projection (VIP) value ≥ 0.7 identified from MD2 pineapple peel, crown and core extracted with 0, 50 and 100% ethanol ratio.
