Isolation of clavulanic acid from fermentation broth by ultrafiltration
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United States of America Patent
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Oct 3, 2000
Grant Date -
N/A
app pub date -
Jun 1, 1998
filing date -
Aug 28, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Provided is a process for preparation and/or purification of clavulanic acid or a pharmaceutically acceptable salt or ester thereof including removing solids from a clavulanic acid containing fermentation broth by microfiltration to form a first filtrate, further removing solids from the first filtrate by ultrafiltration to form a second filtrate, concentrating the second filtrate by removal of water, and treating the concentrated second filtrate to isolate clavulanic acid or a pharmaceutically acceptable salt or ester thereof, characterized in that the first filtrate is filtered using an ultrafiltration membrane having a molecular weight cut-off of 10 to 30 kD and a permeate flow rate of 10 to 30 lm.sup.-2 h.sup.-1.
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