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Indexed by:期刊论文

Date of Publication:2009-03-01

Journal:BIORESOURCE TECHNOLOGY

Included Journals:SCIE、EI、PubMed、Scopus

Volume:100

Issue:6

Page Number:2082-2084

ISSN No.:0960-8524

Key Words:2-Picolinic acid; Nitrobenzene; Degradation; 6-Hydroxy picolinic acid; Streptomyces

Abstract:Streptomyces sp. Z2 was isolated from nitrobenzene contaminated activated sludge, which utilized nitrobenzene as a sole source of carbon, nitrogen, and energy under aerobic condition. It was found that besides nitrobenzene strain Z2 can degrade 2-picolinic acid. Strain Z2 completely degraded 2-picolinic acid with initial concentration of 500 mg/L, 1000 mg/L, 1500 mg/L, 2000 mg/L, 2500 mg/L, and 3000 mg/L within 36 h, 50 h, 72 h, 100 h, 136 h, and 180 h, respectively. Kinetics of 2-picolinic acid degradation was described using the Andrews equation. The kinetic parameters were as follows: q(max) = 3.81 h(-1), K-s = 83.10 mg/L, and K-i = 252.11 mg/L. During the biodegradation process, Z2 transformed 2-picolinic acid into a product which was identified as 6-hydroxy picolinic acid by UV-vis spectrometry, H-1 nuclear magnetic resonance spectroscopy, and mass spectrometry. 6-Hydroxy picolinic acid was then cleaved and mineralized with release of ammonia. (c) 2008 Elsevier Ltd. All rights reserved.