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Chinese medicine chemistry: two-phase solvent extraction operation matters needing attention

by:Deyuan      2020-07-25

in order to help the masses of licensed pharmacists examinee test pass smoothly pass licensed pharmacists, the medical education website small make up to sort out the 'Chinese medicine chemistry: two-phase solvent extraction operation notes' knowledge, relevant content: first, using small tube violent vibration wave about minutes, observe two fluid layer stratification after extraction. If easy to produce emulsion, a large number of extraction to avoid violent vibration wave, can prolong extraction time. Such as emulsifying phenomenon, emulsion layer can be separated, then use the new solvent extraction; Or the emulsion layer suction filter, or heat the emulsion layer slightly; Or a long time to place does not rotate, make its natural stratification. Emulsifying phenomenon is serious, can be used in a two-phase solvent reflux extraction plant continuously. , the concentration of the water extract had better be in proportion. — — 。 Between, is too dilute solvent dosage is too large, affect the operation. , solvent and aqueous solution should maintain a certain amount, the proportion of extraction for the first time, more solvent, and is commonly/water extract, the dosage of the later can be a bit less, general / - /. , general extraction - — Time can be. But hydrophilic hard to turn into larger components organic solvent layer, must increase the extraction times, or change the extraction solvent.
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