Involvement of both Type I and Type II mechanisms in Gram-positive and Gram-negative bacteria photosensitization by a meso-substituted cationic porphyrin

EPR study of gamma irradiated N-methyl taurine (C3H9NO3S) and sodium hydrogen sulphate monohydrate (NaHSO3·H2O) single crystals

“…The obtained g values of each site are consistent with the literature values. It is also found that the g and A values of -OH radical observed in NaHSO 3 ·H 2 O are consistent with the OH values reported for different lattices [21][22][23][24][25][26][27]. The results for SO − 3 radical in both crystals have similar values to those reported in related studies.…”

EPR study of gamma irradiated N-methyl taurine (C3H9NO3S) and sodium hydrogen sulphate monohydrate (NaHSO3·H2O) single crystals

“…The obtained g values of each site are consistent with the literature values. It is also found that the g and A values of -OH radical observed in NaHSO 3 ·H 2 O are consistent with the OH values reported for different lattices [21][22][23][24][25][26][27]. The results for SO − 3 radical in both crystals have similar values to those reported in related studies.…”

Mechanism of UV‐driven Photoelectrocatalytic Degradation of Berberine Chloride Form Using the ESR Spin‐trapping Method

“…In addition, the three‐line ESR signal with intensity ration of 1:1:1 corresponded to the assignment of the TEMP‐ 1 O 2 adduct. As shown in Fig.…”

Mechanistic insight into the photodynamic effect mediated by porphyrin-fullerene C 60 dyads in solution and in Staphylococcus aureus cells

“…Previous studies about the contribution of ROS in the photodynamic inactivation of a Gram-positive bacterium Enterococcus hirae by meso -tetra( N -methyl-4-pyridyl)porphyrin (TMPyP) was investigated using several scavengers. 40 The results demonstrated that for Gram-positive bacteria, type I reactions appear to play a minor role compared to type II reactions. On the other hand, mechanistic studies on the photodynamic effect induced by fullerene C 60 derivative on S. aureus cells showed that under aerobic condition the photocytotoxicity activity induced by fullerene was mediated by mainly a contribution of type II process.…”

“…Azide ions can deactivate O 2 ( 1 Δ g ) and other compounds in its excited triplet state through an energy transfer. 40 A lower value of k Trp obs was obtained when for the reaction sensitized by TCP in the presence of azide ions ( Table 1 ), according with the formation of O 2 ( 1 Δ g ). In contrast, for TCP-C 60 and TCP-C 60 4+ the values of k Trp obs were little affected by the addition of sodium azide, indicating a contribution of type I mechanism in Trp photooxidation process.…”

EPR study of gamma irradiated N-methyl taurine (C3H9NO3S) and sodium hydrogen sulphate monohydrate (NaHSO3·H2O) single crystals

“…The obtained g values of each site are consistent with the literature values. It is also found that the g and A values of -OH radical observed in NaHSO 3 ·H 2 O are consistent with the OH values reported for different lattices [21][22][23][24][25][26][27]. The results for SO − 3 radical in both crystals have similar values to those reported in related studies.…”

Mechanism of UV‐driven Photoelectrocatalytic Degradation of Berberine Chloride Form Using the ESR Spin‐trapping Method

“…In addition, the three‐line ESR signal with intensity ration of 1:1:1 corresponded to the assignment of the TEMP‐ 1 O 2 adduct. As shown in Fig.…”

Mechanistic insight into the photodynamic effect mediated by porphyrin-fullerene C 60 dyads in solution and in Staphylococcus aureus cells

“…Previous studies about the contribution of ROS in the photodynamic inactivation of a Gram-positive bacterium Enterococcus hirae by meso -tetra( N -methyl-4-pyridyl)porphyrin (TMPyP) was investigated using several scavengers. 40 The results demonstrated that for Gram-positive bacteria, type I reactions appear to play a minor role compared to type II reactions. On the other hand, mechanistic studies on the photodynamic effect induced by fullerene C 60 derivative on S. aureus cells showed that under aerobic condition the photocytotoxicity activity induced by fullerene was mediated by mainly a contribution of type II process.…”

“…Azide ions can deactivate O 2 ( 1 Δ g ) and other compounds in its excited triplet state through an energy transfer. 40 A lower value of k Trp obs was obtained when for the reaction sensitized by TCP in the presence of azide ions ( Table 1 ), according with the formation of O 2 ( 1 Δ g ). In contrast, for TCP-C 60 and TCP-C 60 4+ the values of k Trp obs were little affected by the addition of sodium azide, indicating a contribution of type I mechanism in Trp photooxidation process.…”

EPR study of gamma irradiated N-methyl taurine (C3H9NO3S) and sodium hydrogen sulphate monohydrate (NaHSO3·H2O) single crystals

“…The obtained g values of each site are consistent with the literature values. It is also found that the g and A values of -OH radical observed in NaHSO 3 ·H 2 O are consistent with the OH values reported for different lattices [21][22][23][24][25][26][27]. The results for SO − 3 radical in both crystals have similar values to those reported in related studies.…”

Mechanism of UV‐driven Photoelectrocatalytic Degradation of Berberine Chloride Form Using the ESR Spin‐trapping Method

“…In addition, the three‐line ESR signal with intensity ration of 1:1:1 corresponded to the assignment of the TEMP‐ 1 O 2 adduct. As shown in Fig.…”

Mechanistic insight into the photodynamic effect mediated by porphyrin-fullerene C 60 dyads in solution and in Staphylococcus aureus cells

“…Previous studies about the contribution of ROS in the photodynamic inactivation of a Gram-positive bacterium Enterococcus hirae by meso -tetra( N -methyl-4-pyridyl)porphyrin (TMPyP) was investigated using several scavengers. 40 The results demonstrated that for Gram-positive bacteria, type I reactions appear to play a minor role compared to type II reactions. On the other hand, mechanistic studies on the photodynamic effect induced by fullerene C 60 derivative on S. aureus cells showed that under aerobic condition the photocytotoxicity activity induced by fullerene was mediated by mainly a contribution of type II process.…”

“…Azide ions can deactivate O 2 ( 1 Δ g ) and other compounds in its excited triplet state through an energy transfer. 40 A lower value of k Trp obs was obtained when for the reaction sensitized by TCP in the presence of azide ions ( Table 1 ), according with the formation of O 2 ( 1 Δ g ). In contrast, for TCP-C 60 and TCP-C 60 4+ the values of k Trp obs were little affected by the addition of sodium azide, indicating a contribution of type I mechanism in Trp photooxidation process.…”