Methods Taking enrichment ratio, recovery rate of polyphyllin, and purity ratio as the performance criteria and using single examining method to examine the operational parameters, i.

Preparative Separation of High-purity Cellooligosaccharides by Polyacrylamide Gel Column;

New techniques of refining high purity methyl acetate;

Determination of Purity of Chlorotoluron by Differential Scanning Calorimetry;

Separation and purification conditions of fructose monopalmitate that synthesized by immobilized lipase enzyme Novozym435 using mixed solvent were investigated.

The separation and purification were carried out by using gel chromatography and high performance liquid chromatography .

In the case of measuring the contents of volatile phenols in water by using 4 - AAP spectrophotometry, the purification of 4 - AAP has great influence on the test results.

By means of making a study of the relationship of particle size and pureness to the crystallization condition of stibium trioxide in production process over the ten particle size fractions of stibium trioxide products,the causes that given rise to the dependence of stibium trioxide pureness on the particle size were compared and analyzed.

The low pureness of parents and the inferior quality of seeds are two prime reasons which makes the low-grade quality of seeds produced by intercrossed maize.