Structural diversity requires individual optimization of ethanol concentration in polysaccharide precipitation

- Ethanol precipitation for natural polysaccharide preparation was critically evaluated.
- Ethanol concentration was emphatically concerned.
- Varied ethanol concentrations could significantly affect the precipitated results.
- Chemical diversity of polysaccharides is the decisive factor in ethanol precipitation.
- Ethanol precipitation for natural polysaccharide should be individually optimized.