Direct modification of bioactive phenothiazines by exposure to laser radiation.

ML, Pascu , V., Nastasa,, A, Smarandache , A., Militaru,, Ana Martins, Miguel Viveiros Bettencourt, M., Boni, , I. R., Andrei,, A, Pascu, A, Staicu , J, Molnár , S, Fanning , Leonard Amaral

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


Whereas exposure of combinations of a phenothiazine and bacterium to incoherent UV increases the activity of the phenothiazine, exposure of the phenothiazine alone does not yield an increase of its activity. Because the laser beam energy is greater than that produced by the incoherent UV sources, exposure of phenothiazines to specific lasers may yield molecules with altered activities over that of the unexposed parent. Chlorpromazine, thioridazine and promethazine active against bacteria were exposed to two distinct lasers for varying periods of time. Absorption and fluorescence spectra were conducted prior to and post-exposure and the products of laser exposure evaluated for activity against a Staphylococcus aureus ATCC strain via a disk susceptibility assay. Exposure to lasers alters the absorption/fluorescence spectra of the phenothiazines; reduces the activity of thioridazine against the test bacterium; produces a highly active chlorpromazine compound against the test organism. Exposure of phenothiazines to lasers alters their structure that results in altered activity against a bacterium. This is the first report that lasers can alter the physico-chemico characteristics to the extent that altered bioactivity results. Exposure to lasers is expected to yield compounds that are difficult to make via chemical manipulation methods. A survey of selected patents of interest, even co-lateral for the subject of this article is shortly made.
Original languageEnglish
Pages (from-to)147-157
Number of pages11
JournalRecent Patents On Anti-Infective Drug Discovery
Issue number2
Publication statusPublished - 1 Jan 2011


  • Bioactive
  • Phenothiazines
  • Lasers
  • Laser induced fluorescence
  • Laser induced modification of physico-chemical properties
  • Laser photochemistry
  • Polymer Formation
  • Irradiation of Chlorpromazine
  • Fluorescence Spectra
  • Staphylococcus aureus


Dive into the research topics of 'Direct modification of bioactive phenothiazines by exposure to laser radiation.'. Together they form a unique fingerprint.

Cite this