Document Detail

Biodegradation of tannic acid by Citrobacter freundii isolated from a tannery effluent.
MedLine Citation:
PMID:  10427737     Owner:  NLM     Status:  MEDLINE    
A bacterial strain capable of utilizing tannic acid as sole carbon source was isolated from the effluent of a tannery and was identified as Citrobacter freundii. This organism could grow at concentrations as high as 5% (w/v) of tannic acid and produced extracellular tannase to hydrolyze the same. When grown in minimal medium containing 1% tannic acid (w/v) at 30 degrees C, this strain produced 1.87 U/ml of tannase at 6 h. At that time, tannic acid degradation products, namely glucose and gallic acid, were detectable in the culture filtrate; the other intermediate metabolites formed were pyrogallol (extracellular) and pyruvate (intracellular). 2-hydroxymuconic acid is presumed to form as a result of ortho-cleavage of pyrogallol. The proposed biochemical pathway for the degradation of tannic acid by Citrobacter freundii is: Tannic acid-->[Glucose + Gallic acid]-->Pyrogallol -->2-hydroxymuconic acid -->[?]-->Pyruvate.
R A Kumar; P Gunasekaran; M Lakshmanan
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of basic microbiology     Volume:  39     ISSN:  0233-111X     ISO Abbreviation:  J. Basic Microbiol.     Publication Date:  1999  
Date Detail:
Created Date:  1999-08-19     Completed Date:  1999-08-19     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8503885     Medline TA:  J Basic Microbiol     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  161-8     Citation Subset:  IM    
Department of Microbial Technology, School of Biological Sciences, Madurai Kamaraj University, India.
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MeSH Terms
Biodegradation, Environmental
Carboxylic Ester Hydrolases / metabolism
Citrobacter freundii / enzymology,  metabolism*
Gallic Acid / metabolism
Glucose / metabolism
Hydrolyzable Tannins / metabolism*
Industrial Microbiology
Pyrogallol / metabolism
Pyruvates / metabolism
Time Factors
Reg. No./Substance:
0/Hydrolyzable Tannins; 0/Pyruvates; 149-91-7/Gallic Acid; 50-99-7/Glucose; 87-66-1/Pyrogallol; EC 3.1.1.-/Carboxylic Ester Hydrolases; EC

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