Effects of free radicals from doxycycline hyclate and minocycline hydrochloride under blue light irradiation on the deactivation of Staphylococcus aureus, including a methicillin-resistant strain

Jeu Ming P. Yuann, Shwu Yuan Lee, Sin He, Tak Wah Wong, Meei Ju Yang, Chien Wei Cheng, Shiuh Tsuen Huang, Ji Yuan Liang

研究成果: Article同行評審

1 引文 斯高帕斯(Scopus)

摘要

Doxycycline hyclate (DCH) and minocycline hydrochloride (MH) are tetracycline antibiotics and broad-spectrum antimicrobial agents. The changes in DCH and MH under blue light (λ = 462 nm) irradiation in alkaline conditions (BLIA) were investigated. Deactivation caused by superoxide anion radical (O2•−) and deactivation from DCH and MH during photolysis on Staphylococcus aureus (S. aureus), including methicillin-resistant S. aureus (MRSA), were studied. DCH is relatively unstable compared to MH under BLIA. The level of O2•− generated from the MH-treated photoreaction is lower than that from DCH photolysis, and the DCH-treated photoreaction is more efficient at inactivating S. aureus and MRSA at the same radiant intensity. DCH subjected to BLIA decreased the viability of S. aureus and MRSA by 3.84 and 5.15 log, respectively. Two photolytic products of DCH (PPDs) were generated under BLIA. The mass spectra of the PPDs featured molecular ions at m/z 460.8 and 458.8. The molecular formulas of the PPDs were C21H22N2O10 and C22H24N2O9, and their exact masses were 462.44 and 460.44 g/mol, respectively. These results bolster the photolytic oxidation that leads to DCH-enhanced deactivation of S. aureus and MRSA. Photochemical treatment of DCH could be applied as a supplement in hygienic processes.

原文English
文章編號112370
期刊Journal of Photochemistry and Photobiology B: Biology
226
DOIs
出版狀態Published - 2022 1月

All Science Journal Classification (ASJC) codes

  • 輻射
  • 放射與超音波技術
  • 生物物理學
  • 放射學、核子醫學和影像學

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