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当前位置: 首页 > 文章 > Screening and degradation characteristics of a tylosin-degrading strain 农业科学学报 (英文) 2020,19 (4)
Position: Home > Articles > Screening and degradation characteristics of a tylosin-degrading strain Journal of Integrative Agriculture 2020,19 (4)

Screening and degradation characteristics of a tylosin-degrading strain

作  者：
Feng Chang-qing;Cheng Deng-miao;Feng Yao;Qi Wei-ning;Jia Zhen-hu;Weaver, Louise;Liu Yuan-wang;Li Zhao-jun
单  位：
Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, China New Zealand Joint Lab Soil Mol Ecol, Minist Agr & Rural Affairs,Key Lab Plant Nutr & F, Beijing 100081, Peoples R China;Inst Environm & Sci Res Ltd, Christchurch Sci Ctr, Christchurch 8041, New Zealand;Shanxi Normal Univ, Coll Life Sci, Linfen 041004, Shanxi, Peoples R China
关键词：
antibiotics;tylosin;screening;degrading strain;B. borstelensis;degradation characteristic
摘  要：
Antibiotics residues have been accumulating in the environment day by day due to overuse of antibiotics. Recalcitrant antibiotic residues, such as tylosin (TYL), can cause serious environmental problems, which makes it important to eliminate TYL from the environment. It is important to eliminate TYL from the environment. In this study, a strain was isolated and purified from fermentation by-product that came from a TYL production factory. The TYL degrading strain was identified by its morphology, physiological and biochemical reactions and sequencing the PCR-amplified fragments of its 16S rDNA-coding genes. The temperature, shaking speed, initial TYL concentration, pH and inoculum sizes were investigated under simulated conditions by using single factor tests. The results showed that TYL2, a high efficient strain was isolated and was identified as Brevibacillus borstelensis. The degradation rate of TYL by this strain could reach to 75% with an initial concentration of 25 mg L-1 within 7 days under conditions of 7% B. borstelensis (v/v(1) 2x 10(8) CFU mL(-1)) at pH 7.0 and at 35 degrees C. It is interesting that this strain has a very strong ability to degrade the TYL in natural sewage with the degradation rate of 65% within 7 days. This result could be helpful for the degradation of TYL and provide guidance for the degradation of other antibiotics.

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