Photochem最新文献_第5页

Action of Photodynamic Therapy at Low Fluence in 9 L/lacZ Cells after Interaction with Chlorins 低通量光动力治疗与氯相互作用后对9l /lacZ细胞的作用

Photochem Pub Date : 2023-02-02 DOI: 10.3390/photochem3010006

Gabrielle dos Santos Vitorio, B. H. Godoi, J. G. Pinto, Isabelle Ferreira, C. P. Soares, J. Ferreira-Strixino

{"title":"Action of Photodynamic Therapy at Low Fluence in 9 L/lacZ Cells after Interaction with Chlorins","authors":"Gabrielle dos Santos Vitorio, B. H. Godoi, J. G. Pinto, Isabelle Ferreira, C. P. Soares, J. Ferreira-Strixino","doi":"10.3390/photochem3010006","DOIUrl":"https://doi.org/10.3390/photochem3010006","url":null,"abstract":"Gliosarcoma (GS) is a primary malignant neoplasm of the central nervous system, treated with an unfavorable prognosis with surgery, radiotherapy, and chemotherapy. The treatment for GS consists of surgical resection, almost always accompanied by radiotherapy and/or chemotherapy, given the invasive behavior of the tumor. Photodynamic Therapy (PDT) is studied as an alternative method that combines light, a photosensitizer (PS), and molecular oxygen. This study aimed to compare the effects of PDT using the photosensitizers Fotoenticine (FTC) and Photodithazine (PDZ) at low concentrations and fluences. For this study, 9 L/lacZ cells, concentrations of 1.55 µg mL−1, 12.5 µg mL−1, and 50 µg mL−1 of chlorins and fluences of 1, 5, and 10 J/cm2 were used. A test was also carried out with Trypan Blue in L929 cells at the mentioned concentrations at 5 J/cm2. Both chlorins were internalized in the cytoplasm, with a significant reduction in viability (>95%) in almost all groups and altered cell adhesion and morphology after PDT. HSP70 expression decreased in both PS, while HSP27 increased only in PDT with FTC, and although there was a change in cell adhesion in the 9 L/LacZ lineage it was not observed in the L929 fibroblast lineage. Both chlorins were effective, highlighting the concentration of 50 µg mL−1 at the fluence of 5 J/cm2; according to the present study, the PDZ showed better results.","PeriodicalId":74440,"journal":{"name":"Photochem","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44862092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spectroscopic and DFT Study of Alizarin Red S Complexes of Ga(III) in Semi-Aqueous Solution 半水溶液中茜素红S配合物Ga(III)的光谱和DFT研究

Photochem Pub Date : 2023-01-31 DOI: 10.3390/photochem3010005

Lícinia L. G. Justino, Sofia Braz, M. Ramos

{"title":"Spectroscopic and DFT Study of Alizarin Red S Complexes of Ga(III) in Semi-Aqueous Solution","authors":"Lícinia L. G. Justino, Sofia Braz, M. Ramos","doi":"10.3390/photochem3010005","DOIUrl":"https://doi.org/10.3390/photochem3010005","url":null,"abstract":"A combined spectroscopic and computational approach has been used to study in detail the complexation between Ga(III) and ARS in solution. The NMR results revealed the formation of four Ga(III)/ARS complexes, at pH 4, differing in their metal:ligand stoichiometries or configuration, and point to a coordination mode through the ligand positions C-1 and C-9. For equimolar metal:ligand solutions, a 1:1 [Ga(ARS)(H2O)4]+ complex was formed, while for 1:2 molar ratio solutions, a [Ga(ARS)2(H2O)2]− complex, in which the two ligands are magnetically equivalent, is proposed. Based on DFT calculations, it was determined that this is a centrosymmetric structure with the ligands in an anti configuration. For solutions with a 1:3 molar ratio, two isomeric [Ga(ARS)3]3− complexes were detected by NMR, in which the ligands have a mer and a fac configuration around the metal centre. The DFT calculations provided structural details on the complexes and support the proposal of a 1,9 coordination mode. The infrared spectroscopy results, together with the calculation of the infrared spectra for the theoretically proposed structures, give further support to the conclusions above. Changes in the UV/vis absorption and fluorescence spectra of the ligand upon complexation revealed that ARS is a highly sensitive fluorescent probe for the detection of Ga(III).","PeriodicalId":74440,"journal":{"name":"Photochem","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47405768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Acknowledgment to the Reviewers of Photochem in 2022 对2022年Photochem评审员的致谢

Photochem Pub Date : 2023-01-20 DOI: 10.3390/photochem3010004

引用次数: 0

Bismuth Vanadate-Nanostructured Graphite Electrodes For Rhodamine B Photoelectrochemical Degradation 钒酸铋-纳米石墨电极用于罗丹明B的光电降解

Photochem Pub Date : 2023-01-13 DOI: 10.3390/photochem3010003

Bruna Guimarães Isecke, Arthur Saldanha Guimarães, G. F. Teixeira, F. Colmati, Aparecido Ribeiro de Souza, I. L. D. de Macêdo, L. Duarte, S. D. de Oliveira, André Gabriel Carmo Costa, V. Somerset, Eric de Souza Gil

{"title":"Bismuth Vanadate-Nanostructured Graphite Electrodes For Rhodamine B Photoelectrochemical Degradation","authors":"Bruna Guimarães Isecke, Arthur Saldanha Guimarães, G. F. Teixeira, F. Colmati, Aparecido Ribeiro de Souza, I. L. D. de Macêdo, L. Duarte, S. D. de Oliveira, André Gabriel Carmo Costa, V. Somerset, Eric de Souza Gil","doi":"10.3390/photochem3010003","DOIUrl":"https://doi.org/10.3390/photochem3010003","url":null,"abstract":"Electrocatalysis is a promising way to treat water contaminated by harmful organic compounds. The combination of nanoparticles supported on a conductive substrate allows degradation to occur under less energetic conditions. This work evaluated the effect of deposition of bismuth vanadate (BVO) particles on pencil-type graphite electrodes. BVO particles were obtained by ultrasonic irradiation with coprecipitation. Then, they were deposited on the surface of a graphite electrode by the impregnation method. A 23-design was used to optimize electrode fabrication. Matter Dispersion Spectroscopy (SEM/EDS), X-Ray Diffraction (XRD) and Dynamic Light Scattering (DLS) were used for characterization. Electrochemical characterization was performed by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The results confirmed the synthesis of BVO@C (BVO/graphite). Furthermore, BVO@C significantly increased the electroactive surface area of the electrode, decreased the electron transfer resistance, and significantly increased the electron transfer rate to a greater extent than the electrode without any modification. To prove that the performance of BVO@C is better than the pure electrode, photoelectrocatalysis (PEC) and electrocatalysis (EC) were performed in a rhodamine B (RhB) solution. The results showed that in 5 min of treatment with unmodified electrode, BVO@C EC system and BVO@C PEC system, there was degradation of 31.53%, 46.09% and 58.17% respectively, reaching 95%, 98% and 99.64%, respectively, in 30 min. The reaction rate constants were calculated and to be found k = 0.10272 m−1, k = 0.12221 m−1 and k= 0.15022 m−1 for the unmodified graphite, BVO@C EC System and BVO@C PEC system, respectively. These results demonstrate that the BVO@C electrodes are efficient for application in a wide range of treatments, including the treatment of organic pollutants.","PeriodicalId":74440,"journal":{"name":"Photochem","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47595757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cobalt Sulfide (Co9S8)-Based Materials with Different Dimensions: Properties, Preparation and Applications in Photo/Electric Catalysis and Energy Storage 不同尺寸硫化钴(Co9S8)基材料:性质、制备及其在光电催化和储能中的应用

Photochem Pub Date : 2023-01-12 DOI: 10.3390/photochem3010002

Chuantao Wang, X. Pang, Guanghui Wang, Lou-jun Gao, F. Fu

{"title":"Cobalt Sulfide (Co9S8)-Based Materials with Different Dimensions: Properties, Preparation and Applications in Photo/Electric Catalysis and Energy Storage","authors":"Chuantao Wang, X. Pang, Guanghui Wang, Lou-jun Gao, F. Fu","doi":"10.3390/photochem3010002","DOIUrl":"https://doi.org/10.3390/photochem3010002","url":null,"abstract":"Due to their excellent properties and unique structures, transition metal sulfides play an important role in the development of efficient and stable photoelectric catalysts. In recent years, their potential applications have expanded from photoelectric catalysis to energy storage, especially as materials for key components of electrochemical energy storage. As a typical multifunctional metal sulfide catalyst, Co9S8 is highly attractive due to its high conductivity, better stability, suitable band structure, enhanced performance and wide applications. A large number of studies have shown that strategically modified Co9S8-based materials have greater advantages in various applications compared with pure Co9S8. Therefore, this review will evaluate the physicochemical properties and the preparation of different dimensions of Co9S8-based materials, and the influence of different structures on the photoelectrochemical energy of materials will be described. In addition, the research progress regarding the evolution of hydrogen photocatalytic, electrocatalytic water splitting and various electrochemical energy storage materials will be emphasized. Finally, the challenges faced by Co9S8-based materials and the research directions for their future applications will be discussed.","PeriodicalId":74440,"journal":{"name":"Photochem","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48949980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fluorescence Quantum Yields and Lifetimes of Aqueous Natural Dye Extracted from Tradescantia pallida purpurea at Different Hydrogen Potentials 不同氢电位条件下褐藻天然染料的荧光量子产率和寿命

Photochem Pub Date : 2023-01-03 DOI: 10.3390/photochem3010001

Sthanley R. de Lima, Larissa R. Lourenço, Marina Thomaz, D. N. Messias, A. Andrade, V. Pilla

引用次数: 0

Structural Quasi-Isomerism in Au/Ag Nanoclusters Au/Ag纳米团簇的结构准同分异构

Photochem Pub Date : 2022-12-05 DOI: 10.3390/photochem2040060

Yifei Zhang, K. Busari, Changhai Cao, Gao Li

引用次数: 1

Effect of the Donor/Acceptor Size on the Rate of Photo-Induced Electron Transfer 供体/受体尺寸对光致电子转移速率的影响

Photochem Pub Date : 2022-11-30 DOI: 10.3390/photochem2040059

N. Tkachenko

引用次数: 1

Application of Zirconia/Alumina Composite Oxide Ceramics as Photocatalysts for Removal of 2,4,6-Trichlorophenol from Water 氧化锆/氧化铝复合氧化物陶瓷光催化剂在水中去除2,4,6-三氯苯酚中的应用

Photochem Pub Date : 2022-11-28 DOI: 10.3390/photochem2040058

Tatjana D. Vulić, M. Carević, N. Abazovic, T. Novaković, Z. Mojović, M. Čomor

{"title":"Application of Zirconia/Alumina Composite Oxide Ceramics as Photocatalysts for Removal of 2,4,6-Trichlorophenol from Water","authors":"Tatjana D. Vulić, M. Carević, N. Abazovic, T. Novaković, Z. Mojović, M. Čomor","doi":"10.3390/photochem2040058","DOIUrl":"https://doi.org/10.3390/photochem2040058","url":null,"abstract":"The mesoporous zirconia/alumina composites were synthesized via a sol–gel method, followed by heat treatment at 500 °C for 5 h. The effect of the ZrO2/Al2O3 ratio on the structural and textural properties of the obtained composites was explored. Sorption analysis has confirmed that all samples have a mesoporous structure whose parameters (SBET, Vp and Dmax) strongly depend on the ZrO2/Al2O3 ratio. The XRD pattern of composites has shown that the addition of zirconia disrupts the crystallinity of alumina. The composites with higher zirconia content (50% ZrO2 and 67% ZrO2) are characterized by peaks related only to the zirconia phase. UV/Vis diffuse reflection spectra of all samples revealed that composites have more intensive absorption compared to pure oxides for wavelengths larger than 250 nm and similar band gaps. Photoluminescence measurements showed presence of defects in all samples, which are responsible for photocatalytic activity. All samples showed significant adsorption/photocatalytic efficacy for the removal/degradation of 2,4,6 -trichlorophenol (TCP). Results obtained using HPLC and TOC techniques showed that between 70 and 80% of the initial TCP concentration was removed/degraded after 4 h of illumination. These results were corelated with flat, conduction and valence band potentials of synthesized pure and binary oxides, calculated using Mott–Schottky plots.","PeriodicalId":74440,"journal":{"name":"Photochem","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46501282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Photodynamic Polymers Constituted by Porphyrin Units as Antibacterial Materials 卟啉单元构成的光动力聚合物作为抗菌材料

Photochem Pub Date : 2022-11-09 DOI: 10.3390/photochem2040057

M. B. Ballatore, M. E. Pérez, Sofía C. Santamarina, J. Durantini, M. Milanesio, E. Durantini

{"title":"Photodynamic Polymers Constituted by Porphyrin Units as Antibacterial Materials","authors":"M. B. Ballatore, M. E. Pérez, Sofía C. Santamarina, J. Durantini, M. Milanesio, E. Durantini","doi":"10.3390/photochem2040057","DOIUrl":"https://doi.org/10.3390/photochem2040057","url":null,"abstract":"Photodynamic inactivation of microorganisms has emerged as a promising strategy to kill and eradicate pathogens. In this work, two polymers, TCP-P and ZnTCP-P, were synthesized by oxidative polymerization of 5,10,15,20-tetrakis [3-(N-ethylcarbazoyl)]porphyrin and its complex with Zn(II). Solid polymers consist of rods (diameter 100 nm, length ~100–500 nm) that form microporous structures on a surface. UV-visible absorption spectra in solution showed the Soret and Q bands characteristic of the corresponding constitutional porphyrins. In addition, the polymers presented two red emission bands with quantum yields ΦF = 0.11 for TCP-P and ΦF = 0.050 for ZnTCP-P. These compounds sensitized the production of singlet molecular oxygen with quantum yields of ΦΔ~0.3. Thus, the spectroscopic and photodynamic properties of the porphyrin units were maintained in the conjugates. The photodynamic activity induced by both polymers was tested to inactivate S. aureus. In cell suspensions, TCP-P was more effective than ZnTCP-P in killing bacteria. Viable S. aureus cells were not detected using 4 µM TCP-P after 20 min of irradiation. Moreover, both polymers showed a high photocytotoxic activity to eradicate S. aureus cells attached to a surface. The results indicate that these conjugated polymers can act as effective antimicrobial agents to photoinactivate pathogens.","PeriodicalId":74440,"journal":{"name":"Photochem","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48835792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0