Enhancement on the Hypocrellin B Singlet Oxygen Generation Quantum Yield in the Presence of Rare Earth Ions

Toffoli, Daniel José; Gomes, Laércio; Vieira, Nilson D.; Courrol, Lilia Coronato; Wetter, Niklaus Ursus; Frejlich, Jaime

doi:10.1063/1.2926819

Cited by 7 publications

(5 citation statements)

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“…In addition, in the presence of DABCO, which is a well‐known singlet oxygen scavenger (Lengfelder et al., ) (Table , entry 6) photooxidation of oleic acid was inhibited. According to the literature, singlet oxygen lifetime in dimethyl sulfoxide (DMSO) solvent is 19 μs, in acetonitrile (CH 3 CN) solvent is 65 μs, and in ethanol solvent is 38 μs which was corresponded with the results in Table (entry 3,7, and 8) (Bressan & Morvillo, ; Chen et al., ; Toffoli, Gomes, Junior, & Courrol, ). Table entry 3, 7, and 8 indicates that conversion of oleic acid in acetonitrile as solvent is higher than ethanol and DMSO that correlated with singlet oxygen lifetimes in this solvents.…”

Section: Resultssupporting

confidence: 79%

“…Paramagnetic metals are claimed to quench singlet oxygen by energy transfer mechanism from oxygen to the low-lying d orbital electron levels and have very short triplet lifetimes ( (Bressan & Morvillo, 1989;Chen et al, 2001;Toffoli, Gomes, Junior, & Courrol, 2008). Table 1 entry 3, 7, and 8 indicates that conversion of oleic acid in acetonitrile as solvent is higher than ethanol and DMSO that correlated with singlet oxygen lifetimes in this solvents.…”

Section: Evidences For Singlet Oxygen Generation and Biocidal Activmentioning

confidence: 99%

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Scavenging effect of pasipay (passiflora incarnate L.) on singlet oxygen generation and fatty acid photooxygenation

Hajimohammadi

Nosrati

2018

Food Science & Nutrition

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Anthracene as a chemical probe is usually used to trap the singlet oxygen and then detection and quantification can be based on absorbance. In this study, oxidation of anthracene declared that rate of singlet oxygen quenching in the presence of pasipay (passiflora incarnate L.) as a natural antioxidant, 1,4 Diazabicyclo [2.2.2] octane (DABCO) as a well‐known singlet oxygen scavenger and highly effective synthetic antioxidants in food industry such as Butylated hydroxytoluene (BHT), Butylated hydroxyanisole (BHA), tert‐Butylhydroquinone (TBHQ) decreased in the order of DABCO >pasipay > TBHQ > BHT > BHA. On the other hand, lipid photooxidation is the undesirable chemical process in which singlet oxygen result in the peroxidation of fatty acids. The results of this study also showed that oleic acid oxidation with singlet oxygen in the presence of pasipay (contains 0.4576 mg flavonoid compounds) diminished about 11% which shows pasipay has an effective role to inhibit lipid peroxidation.

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Section: Resultssupporting

confidence: 79%

Section: Evidences For Singlet Oxygen Generation and Biocidal Activmentioning

confidence: 99%

Scavenging effect of pasipay (passiflora incarnate L.) on singlet oxygen generation and fatty acid photooxygenation

Hajimohammadi

Nosrati

2018

Food Science & Nutrition

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“…Hence there is wide interest to improve red absorption [14] and amphiphilicity of hypocrellins. Studies in the literature have shown that the PDT performance of HB can be improved modifying its structure for example complexing it with lanthanum ions [15,16]. To evaluate HB:La 3+ complex activities against in vitro suspension of C. albicans we compare its performance with one of MB.…”

Section: Introductionmentioning

confidence: 99%

Effectiveness in total reduction of Candida albicans promoted by PDT with hypocrellin B:lanthanum

et al. 2009

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In this work we described the potentiality of the Hypocrellin B (HB) modified with the presence of lanthanum (La 3+ ) ions, in eliminate Candida albicans in suspension. The results showed that the presence of lanthanum ions promotes a red shift of the HB absorption band and an enhancement in singlet oxygen quantum yield in 32%. Also in this work we obtained that the best molar ration between HB and La concentrations was 1:2. No photobleaching was observed in our experimental conditions. Antimicrobial activity was studied exciting C. albicans suspension with a 460 nm LED and a 660 nm laser both with 330 mW/cm 2 irradiance. Best irradiation time, PS concentration and ROS production profile were determined showing that using 460 nm LED with 10 μM of PS, only 30 s of irradiation time was sufficient to reduce 100 % C. albicans colonies.

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“…Table1entry 4 and 6 show that the formation of peroxide products from oleic acid in acetonitrile solvent is higher than ethanol solvent. These results are correlated with 1 O 2 lifetime in acetonitrile (65 𝝁s) and ethanol (38 𝝁s) solvents(Bressan and Morvillo 1989;Chen et al 2001;Toffoli et al 2008). In addition to these results, trace formation of peroxide products in the presence of O 2•-, indicating that the dominant pathway under our reaction conditions is not the Type 𝜤 mechanism.…”

mentioning

confidence: 53%

Suppressing effect of flavonoid compounds on lipids photooxidation of sheep red blood cells and oleic acid photooxidation

Hajimohammadi,

Mahboobi,

2023

Preprint

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Photosensitizers and pigments in raw meat such as porphyrins, riboflavin, and myoglobin after incorporation with light beam prompt the generation of singlet oxygen (1O2) from triplet oxygen (3O2) and causes oxidative rancidity of meat products. In this study, the results of photooxidation reactions of sheep erythrocyte (red blood cell) model as a model rich in hemoglobin and phospholipids bilayer, and oleic acid model were obtained by 1H NMR spectroscopy, TBARS assay and iodometric titration. In both models, the rate of lipid photooxidation in the presence of hydroalcoholic extracts of Turmeric (Curcuma longa L.) and Cumin (Cuminum cyminum L.) as natural antioxidants, Butyl hydroxytoluene (BHT) as a synthetic antioxidant and sodium azide (NaN3) as a well-known 1O2 scavenger were decreased in the order of NaN3 > Turmeric > Cumin > BHT. It was proved during the photooxidation process, there is a direct association between the amount of flavonoid compounds and 1O2 scavenging.

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Enhancement on the Hypocrellin B Singlet Oxygen Generation Quantum Yield in the Presence of Rare Earth Ions

Cited by 7 publications

References 0 publications

Scavenging effect of pasipay (passiflora incarnate L.) on singlet oxygen generation and fatty acid photooxygenation

Scavenging effect of pasipay (passiflora incarnate L.) on singlet oxygen generation and fatty acid photooxygenation

Effectiveness in total reduction of Candida albicans promoted by PDT with hypocrellin B:lanthanum

Suppressing effect of flavonoid compounds on lipids photooxidation of sheep red blood cells and oleic acid photooxidation

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