Extraction of American ginseng polysaccharide by ultrasound-assisted deep eutectic solvents-based three-phase partitioning: Process optimization, structural characterization, and anti-ulcerative colitis study.

According to the P value shown in Table 4 , it was found that the quadratic term (A 2 ) for liquid–solid ratio, (B 2 ) for top phase to the bottom phase ratio, and (C 2 ) for mass fraction of (NH 4 ) 2 SO 4 all reached a highly significant level.

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