Microorganisms hydrolyse amide bonds; knowledge enabling read-across of biodegradability of fatty acid amides

• Published in: Biodegradation (Dordrecht) 2014-07, Vol.25 (4), p.605-614
• Main Authors: Geerts, Roy, Kuijer, Patrick, van Ginkel, Cornelis G., Plugge, Caroline M.
• Format: Article
• Language: English
• Subjects: Aerobic biodegradation; Aeromonas hydrophila; Amides; Amides - chemistry; Amides - metabolism; Amines; Ammonium; Aquatic Pollution; Bacteria; Bacteria - metabolism; Biodegradability; Biodegradation; Biodegradation of pollutants; Biodegradation, Environmental; Biological and medical sciences; Biomedical and Life Sciences; Biotechnology; Environment and pollution; Fatty acids; Fatty Acids - chemistry; Fatty Acids - metabolism; Fundamental and applied biological sciences. Psychology; Geochemistry; Hydrolysis; Industrial applications and implications. Economical aspects; Life Sciences; metabolism; Microbiology; Microorganisms; Mineralization; Original Article; Oxygen - metabolism; Pseudomonas aeruginosa; Pseudomonas aeruginosa - metabolism; Pseudomonas putida; purification; Soil Science & Conservation; Strain; Substrates; Terrestrial Pollution; Waste Management/Waste Technology; Waste Water Technology; Water Management; Water Pollution Control
• ISSN: 0923-9820; 1572-9729
• DOI: 10.1007/s10532-014-9685-2

To get insight in the biodegradation and potential read-across of fatty acid amides, N -[3-(dimethylamino)propyl] cocoamide and N -(1-ethylpiperazine) tall oil amide were used as model compounds. Two bacteria, Pseudomonas aeruginosa PK1 and Pseudomonas putida PK2 were isolated with N -[3-(dimethylamino)propyl] cocoamide and its hydrolysis product N,N -dimethyl-1,3-propanediamine, respectively. In mixed culture, both strains accomplished complete mineralization of N -[3-(dimethylamino)propyl] cocoamide. Aeromonas hydrophila PK3 was enriched with N -(1-ethylpiperazine) tall oil amide and subsequently isolated using agar plates containing dodecanoate. N -(2-Aminoethyl)piperazine, the hydrolysis product of N -(1-ethylpiperazine) tall oil amide, was not degraded. The aerobic biodegradation pathway for primary and secondary fatty acid amides of P . aeruginosa and A . hydrophila involved initial hydrolysis of the amide bond producing ammonium, or amines, where the fatty acids formed were immediately metabolized. Complete mineralization of secondary fatty acid amides depended on the biodegradability of the released amine. Tertiary fatty acid amides were not transformed by P . aeruginosa or A . hydrophila . These strains were able to utilize all tested primary and secondary fatty acid amides independent of the amine structure and fatty acid. Read-across of previous reported ready biodegradability results of primary and secondary fatty acid amides is justified based on the broad substrate specificity and the initial hydrolytic attack of the two isolates PK1 and PK3.