Tetracycline purification process
阅读：74发布：2022-08-22
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1. THE PROCESS OF PURIFYING TETRACYCLINE WHICH COMPRISES CRYSTALLIZING SAID ANTIBIOTIC FROM AN IMPURE SOLUTION THEREOF IN AQUEOUS ALCOHOL BY MAINTAINING THE PH OF SAID SOLUTION BETWEEN ABOUT 2.5 AND 9.5, SAID ALCOHOL BEING SELECTED FROM THE GROUP CONSISTING OF ALKANOLS HAVING UP TO 3 CARBON ATOMS AND ETHYLENE GLYCOL MONOALKYL ETHERS HAVING A TOTAL OF 3 TO 4 CARBON ATOMS, SAID SOLUTION HAVING DISSOLVED THEREIN A CITRATE SELECTED FROM THE GROUP CONSISTING OF CITRIC ACID, ALKALI METAL CITRATES, AND AMMONIUM CITRATES AT A CONCENTRATION OF AT LEAST ABOUT 3 MILLIMOLES PER GRAM OF TETRACYCLINE BASE ACTIVITY.
5. THE PROCESS OF PURIFYING TETRACYCLINE WHICH COMPRISES CRYSTALLIZING SAID ANTIBIOTIC FROM AN IMPURE SOLUTION THEREOF IN AQUEOUS ALCOHOL BY MAINTAINING THE PH OF SAID SOLUTION BETWEEN ABOUT 2.5 AND 9.5, SAID ALCOHOL BEING SELECTED FROM THE GROUP CONSISTING OF ALKANOLS HAVING UP TO 3 CARBON ATOMS AND ETHYLENE GLYCOL MONOALKYL ETHERS HAVING A TOTAL OF 3 TO 4 CARBON ATOMS, SAID SOLUTION HAVING DISSOLVED THEREIN A CITRATE SELECTED FROM THE GROUP CONSISTING OF CITRIC ACID, ALKALI METAL CITRATES, AND AMMONIUM CITRATES AT A CONCENTRATION BETWEEN ABOUT 3 AND ABOUT 20 MILLIMOLES PER GRAM OF TETRACYCLINE BASE ACTIVITY, AND UREA AT A CONCENTRATION BETWEEN ABOUT 1 AND ABOUT 6 MILLIMOLES PER GRAM OF TETRACYCLINE BASE ACTIVITY.
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