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Process for improving the stability and taste of tetracycline antibiotics

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1. A PROCESS FOR IMPROVING THE STABILITY AND TASTE OF A TETRACYCLINE ANTIBIOTIC SELECTED FROM THE GROUP CONSISTING OF TETRACYCLINE, OXYTETRACYCLINE AND CHLORTETRACYCLINE WHICH COMPRISES CONTACTING AN AQUEOUS SOLUTION OF SAID TETRACYCLINE ANTIBIOTIC AT A PH OF FROM ABOUT 0.5 TO ABOUT 2 WITH A SALT SELECTED FROM THE GROUP CONSISTING OF SODIUM, POTASSIUM AND LITHIUM SALTS OF AN ANIONIC SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF HIGHER ALKANOIC ACID OF FROM 10 TO 24 CARBON ATOMS AND SULFURIC ACID MONOESTERS OF AN ALKANOL OF FROM 10 TO 24 CARBON ATOMS AND N-ALKANOLAMIDE OF SAID ALKANOIC ACID WHEREIN THE ALKANOL GROUP CONTAINS 2 TO 4 CARBON ATOMS, THE AMOUNT OF SAID ALKALI METAL SALT BEING FROM ABOUT 4% TO ABOUT 7% BY WEIGHT OF SAID TETRACYCLINE ANTIBIOTIC, SEPARATING RESULTING PRECIPITATE, ADJUSTING THE PH OF SOLUTION SO PRODUCED TO VALUE OF FROM ABOUT 3 TO ABOUT 5 AND RECOVERING SAID ANTIBIOTIC.
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