News Column

Investigators at University of Toronto Detail Findings in Antibiotics

May 30, 2014

By a News Reporter-Staff News Editor at Drug Week -- A new study on Drugs and Therapies is now available. According to news originating from Toronto, Canada, by NewsRx correspondents, research stated, "Application of antibacterial nanoparticles to improve root canal disinfection has received strong interest recently. The current study aims to assess the antibacterial effect of a novel photosensitizer (rose bengal functionalized chitosan nanoparticles [CSRBnp]) to eliminate bacteria in the presence of various root canal constituents that are known to inhibit the antibacterial efficacy of root canal disinfectants."

Our news journalists obtained a quote from the research from the University of Toronto, "The synthesized CSRBnp were evaluated for size, charge, and singlet oxygen release. The antibacterial effect of CSRBnp was tested on planktonic Enterococcus faecalis with or without pretreatment by using different inhibiting agents such as dentin, dentin-matrix, pulp tissue, bacterial lipopolysaccharides, and bovine serum albumin (BSA). Bacterial survival was assessed in a time-dependent manner. The antibacterial effects after photodynamic activation on CSRBnp, a cationic photosensitizer (methylene blue), and an anionic photosensitizer (rose bengal [RB]) in the presence of inhibitors were also evaluated. CSRBnp were 60 20 nm in size and showed reduced rate of singlet oxygen release as compared with methylene blue and RB. Pulp and BSA inhibited the antibacterial effect of CSRBnp (without photoactivation) significantly (P <.05) even after 24 hours of interaction. In case of photodynamic therapy, the pulp and BSA significantly inhibited the antibacterial activity of all 3 photosensitizers. CSRBnp showed residual effect and completely eliminated the bacteria after 24 hours of interaction after photodynamic therapy."

According to the news editors, the research concluded: "The inherent antibacterial activity of polycationic chitosan nanoparticles and the singlet oxygen released after photoactivation of RB synergistically provided CSRBnp the potential to achieve significant antibacterial efficacy even in the presence of tissue inhibitors within root canals."

For more information on this research see: Antibacterial Efficacy of Photosensitizer Functionalized Biopolymeric Nanoparticles in the Presence of Tissue Inhibitors in Root Canal. Journal of Endodontics, 2014;40(4):566-570. Journal of Endodontics can be contacted at: Elsevier Science Inc, 360 Park Ave South, New York, NY 10010-1710, USA. (Elsevier -; Journal of Endodontics -

The news correspondents report that additional information may be obtained from A. Shrestha, University of Toronto, Discipline Endodont, Toronto, ON M5G 1G6, Canada (see also Drugs and Therapies).

Keywords for this news article include: Antibacterial, Antibiotics, Antimicrobials, Canada, Toronto, Ontario, Chalcogens, Singlet Oxygen, Drugs and Therapies, Bovine Serum Albumin, Reactive Oxygen Species, North and Central America

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Source: Drug Week