Biotechnology Bulletin ›› 2019, Vol. 35 ›› Issue (11): 124-131.doi: 10.13560/j.cnki.biotech.bull.1985.2019-0528

Previous Articles     Next Articles

Effects of Nano-TiO2 and Tetracycline Exposure on Drug-resistant Escherichia coli

ZHANG Yong-li, YUAN Wei, YANG Qing-xiang   

  1. College of Life Sciences,Henan Normal University,Xinxiang 453007
  • Received:2019-06-18 Online:2019-11-26 Published:2019-11-19

Abstract: The drug-resistant Escherichia coli(M13)and sensitive quality control strain(E. coli ATCC25922)were used to study the effects of nano-TiO2 and tetracycline on the growth of E. coli. The results showed that the addition of nano-TiO2 further inhibited the growth of sensitive bacteria compared with the addition of the gradient concentration of tetracycline alone,while the drug-resistant bacteria did not change much. The antibacterial rate of nano-TiO2 alone or co-exposure to the drug-resistant bacteria was below 40%,while that to the sensitive bacteria ranged in 80% and 100%. The drug-resistant strain M13 was resistant to antibiotics and also to nano-TiO2.There are some commonalities between microbial resistance mechanisms against antibiotics and other environmental virulence factors,but the mechanism of microbial resistance under co-exposure conditions remains to be further studied.

Key words: drug-resistant Escherichia coli, nano-TiO2, tetracycline, antibacterial rate