Antimicrobial photodynamic therapy against Lactobacillus casei using curcumin, nano-curcumin, or erythrosine and a dental LED curing device

This study aimed to investigate the photodynamic effects of curcumin, nanomicelle curcumin, and erythrosine on  Lactobacillus casei (L. casei). Various concentrations of curcumin (1.5  g/L, 3 g/L), nano-curcumin (3 g/L), and erythrosine (100 µM/L, 250 µM/L) were tested either alone or combined with light irradiation (PDT effect) againstL. casei in planktonic and biofilm cultures. The light was emitted from a light-emitting diode (LED) with a central wavelength of 450 nm. A 0.12% chlorhexidine digluconate (CHX) solution served as the positive control, and a solution containing neither photosensitizer nor light was the negative control group. The number of viable microorganisms was determined using serial dilution. There was a significant difference in the viability ofL. casei in both planktonic and biofilm forms (P <  0.05). In the planktonic culture, the antibacterial effects of CHX and PDT groups with curcumin 3 g/L and erythrosine 250 µM/L were significantly greater than the other groups (P <  0.05). ForL. casei biofilms, the greatest toxic effects were observed in CHX and PDT groups with curcumin 3  g/L, erythrosine 250 µmol/L, erythrosine 100 µmol/L, and nanomicelle curcumin 3 g/L, with a significant difference to other groups (P <  0.05). The antibacterial effects of all photosensitizers (except erythrosine 250 µmol/L at planktonic culture) enhanced significantly when combined with light irradiation (P <  0.05). PDT with curcumin...
Source: Lasers in Medical Science - Category: Laser Surgery Source Type: research