Author/Authors :
Hajizadeh، Nader نويسنده Young Researcher and Elite Club, Ilkhchi Branch, Islamic Azad University, Ilkhchi, Iran , , Sefidi Heris، Youssof نويسنده Department of Pharmaceutical Biotechnology, Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, IR Iran , , Zununi Vahed، Sepideh نويسنده School of Advanced Biomedical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran , , Hejazi، Mohammad Saeid نويسنده , , Vallipour، Javad نويسنده Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, IR Iran , , Golabi، Sayyed Mahdi نويسنده Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, IR Iran , , Asadpour Zeynali، Karim نويسنده , , Hejazi، Mohammad Amin نويسنده Branch for the Northwest and West Region, Agriculture Biotechnology Research Institute of Iran (ABRII), Tabriz, IR Iran ,
Abstract :
Background: Aromatic compounds are known as a group of highly persistent environmental pollutants. Halomonas sp. TBZ3 was isolated from the highly salty Urmia Lake of Iran. In this study, characterization of a new Halomonas isolate called Halomonas sp. TBZ3 and its employment for biodegradation of para-amino acetanilide (PAA), as an aromatic environmental pollutant, is described.
Objectives: This study aimed to characterize the TBZ3 isolate and to elucidate its ability as a biodegradative agent that decomposes PAA.
Materials and Methods: Primarily, DNA-DNA hybridization between TBZ3, Halomonas denitrificans DSM18045T and Halomonas saccharevitans LMG 23976T was carried out. Para-amino acetanilide biodegradation was assessed using spectrophotometry and confirmed by gas chromatography-mass spectroscopy (GC-MS). Parameters effective on biodegradation of PAA were optimized by the Response Surface Methodology (RSM).
Results: The DNA-DNA hybridization experiments between isolate TBZ3, H. denitrificans and H. saccharevitans revealed relatedness levels of 57% and 65%, respectively. According to GC-MS results, TBZ3 degrades PAA to benzene, hexyl butanoate, 3-methyl-1-heptanol and hexyl hexanoate. Temperature 32.92°C, pH 6.76, and salinity 14% are the optimum conditions for biodegradation with a confidence level of 95% (at level ? = 0.05).
Conclusions: According to our results, Halomonas sp. TBZ3 could be considered as a biological agent for bioremediation of PAA and possibly other similar aromatic compounds.
