Biodegradation of mixtures of chlorophenoxyalkanoic acid herbicides by Alcaligenes denitrificans

An Alcaligenes denitrificans strain able to degrade (R)-2-(2-methyl-4-chlorophenoxy)propionic acid [(R)-MCPP, mecoprop] was assessed for its ability to utilise a range of chlorophenoxyalkanoic acid herbicides in single, binary, tertiary and quaternary combinations in batch culture. Degradation rates...

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Bibliographic Details
Published in:Journal of industrial microbiology & biotechnology 2000-11, Vol.25 (5), p.255-259
Main Authors: MARRIOTT, M. W, SMEJKAL, C. W, LAPPIN-SCOTT, H. M
Format: Article
Language:English
Subjects:
(RS)-2-(2,4-dichlorophenoxy)propionic acid
2,4-D
2-(2,4-Dichlorophenoxy)propionic acid
4-chloro-2-methylphenoxyacetic acid
Acids
Alcaligenes
Alcaligenes denitrificans
Biodegradation
Biodegradation of pollutants
Biological and medical sciences
Biotechnology
Catalysis
chlorophenoxyalkanoic acid
Environment and pollution
Enzymatic activity
Experiments
Fundamental and applied biological sciences. Psychology
Herbicides
Industrial applications and implications. Economical aspects
Laboratories
MCPP
Microbiology
Studies
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Summary:An Alcaligenes denitrificans strain able to degrade (R)-2-(2-methyl-4-chlorophenoxy)propionic acid [(R)-MCPP, mecoprop] was assessed for its ability to utilise a range of chlorophenoxyalkanoic acid herbicides in single, binary, tertiary and quaternary combinations in batch culture. Degradation rates were rapid with single growth substrates; complete degradation occurred within 29 h for 2,4-dichlorophenoxyacetic acid (2,4-D), 43 h for 4-chloro-2-methylphenoxyacetic acid (MCPA) and 50 h for (R)-MCPP, respectively. After 20 h, the degradation of (RS)-2-(2,4-dichlorophenoxy)propionic acid [(RS)-2,4-DP] had ceased, with only the (R)-enantiomer being degraded. In binary combination, 2,4-D and MCPP degraded within 55 h. Degradation rates decreased when herbicides were added in tertiary and quaternary combinations. Thus, at the whole cell level, catalysis of closely related herbicides is likely to be facilitated by diverse enzymatic activity in A. denitrificans. Journal of Industrial Microbiology & Biotechnology (2000) 25, 255-259.[PUBLICATION ABSTRACT]
ISSN:1367-5435
1476-5535
DOI:10.1038/sj.jim.7000066