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Polysaccharide content (a), total phenolic content (b), total flavonoid content (c), antioxidant properties (d), lobclyolin content (e), syringin (f) of Codonopsis pilosulae. Different letters represent significant differences (p < 0.05). ND: natural drying; RMVD: rotary microwave vacuum drying; RFVD: radio frequency vacuum drying; VD: vacuum drying; VFID: vacuum far infrared drying.
