Revolutionizing carbon chemistry: Solar ‐powered C(sp3)–N bond activation and CO2 transformation via newly designed SBE‐Y cutting‐edge dynamic photocatalyst
In this paper, we report an artificial photosynthesis system that appears to have had substantial success in terms of 1,4-NADH regeneration, formic acid production from CO2, and fine chemical synthesis. The regenerated 1,4-NADH is then used exclusively in the synthesis of formic acid. Formic acid (HCOOH) is a simple organic acid that might be used as a chemical feedstock. Furthermore, the system is capable of synthesizing fine compounds with a conversion yield of 99.9%. This indicates a high level of efficiency in converting raw materials (perhaps CO2) into useful chemical products. AbstractA solvent-free sulfur-bridge-eos...
Source: Photochemistry and Photobiology - December 16, 2023 Category: Science Authors: Rehana Shahin,
Rajesh K. Yadav,
Rajesh K. Verma,
Chandani Singh,
Satyam Singh,
Tae Wu Kim,
Navneet K. Gupta,
Jin OoK Baeg Tags: RESEARCH ARTICLE Source Type: research
On the mechanism of visible ‐light sensitized photosulfoxidation of toluidine blue O
We report on the formation of toluidine blue O (TBO) sulfoxide by a self-sensitized photooxidation of TBO. Here, the photosulfoxidation process was studied by mass spectrometry (MS) and discussed in the context of photodemethylation processes which both contribute to TBO consumption over time. Analysis of solvent effects with D2O, H2O, and CH3CN along with product yields and MS fragmentation patterns provided mechanistic insight into TBO sulfoxide's formation. The formation of TBO sulfoxide is minor and detectable up to 12% after irradiation of 3 h. The photosulfoxidation process is dependent on oxygen wherein instead o...
Source: Photochemistry and Photobiology - December 15, 2023 Category: Science Authors: Jennifer Otero ‐González,
Whitney Querini‐Sanguillén,
Daniel Torres‐Mendoza,
Ikhil Yevdayev,
Sharon Yunayev,
Kamrun Nahar,
Barney Yoo,
Alexander Greer,
Denis Fuentealba,
José Robinson‐Duggon Tags: RESEARCH NOTE Source Type: research
Probing and perturbing riboswitch folding using a fluorescent base analogue
Fluorescent nucleic acid base analogues are popular probes of RNA and DNA structure. We placed the adenine analogue 2-aminopurine (2-AP) at various positions within a bacterial regulatory RNA and investigated its response to binding of a small molecule. Distinct local environments within this “riboswitch” yield distinct spectral properties of the probe and distinct changes upon ligand binding. 2-AP substitution reduces ligand affinity, highlighting the significance of interactions involving the native adenines. AbstractRiboswitches are mRNA segments that regulate gene expression in response to ligand binding. The Class...
Source: Photochemistry and Photobiology - December 15, 2023 Category: Science Authors: Janson E. Hoeher,
Natalie E. Sande,
Julia R. Widom Tags: SPECIAL ISSUE RESEARCH ARTICLE Source Type: research
Transformation of PMMA from sunlight ‐blocking to sunlight‐activated coupled with DNH photocatalytic platform for oxidative coupling of amines and generation/regeneration of LDC/NADH
In this study, we present the synthesis and characterization of a novel polymer-based photocatalyst, denoted as PMMA-DNH, designed for solar light-harvesting applications. PMMA-DNH incorporates the light-harvesting molecule dinitrophenyl hydrazine (DNH) at varying concentrations (5%, 10%, 20%, 30%, and 40%). Leveraging its high molar extinction coefficient and slow charge recombination, the 30% DNH-incorporated PMMA photocatalyst proves to be particularly efficient. This photocatalytic system demonstrates exceptional yields (96.5%) in imine production and high generation/regeneration rates for LDC/NADH (65.27%/78.77%). The...
Source: Photochemistry and Photobiology - December 13, 2023 Category: Science Authors: Satyam Singh,
Rajesh K. Yadav,
Ahmad Umar,
Ahmed A. Ibrahim,
Tae Wu Kim,
Atul Pratap Singh,
Rajesh Kumar,
Sandeep Chaudhary,
Dilip K. Dwivedi,
Ravindra Vikram Singh,
Navneet Kumar Gupta,
Chandani Singh,
Jin ‐O. Baeg,
Sotirios Baskoutas Tags: RESEARCH ARTICLE Source Type: research
Pediatric parenteral nutrition and hydroperoxide toxicity: Evaluation of the effectiveness of photoprotection medical devices
Evaluation of the efficacy of photoprotection medical devices used in our institution to protect parenteral nutrition from degradation after two different exposures to light. AbstractExposure of parenteral nutrition (PN) to light induces hydroperoxide (HPO) formation whose toxicity, especially in pediatrics, is documented. In this context, we evaluated the efficacy of photoprotection medical devices used in our institution to protect PN from degradation after two different exposures to light. A mixed oil lipid emulsion (Smoflipid ®) in standard or opaque syringes and a ternary PN mixture bags (Numetah®) with or without o...
Source: Photochemistry and Photobiology - December 12, 2023 Category: Science Authors: Pierre Nizet,
Nicolas Guillard,
Lionel Chabaud,
Kamel ‐Olivier Sellal,
Corinne Lejus‐Bourdeau,
Laure Simon,
Dominique Navas,
Emmanuelle Olivier,
Johann Clouet,
Fabien Lindenberg,
Fabien Nativel Tags: RESEARCH ARTICLE Source Type: research
Critical PDT Theory X: The continuing saga of ruthenium
(Source: Photochemistry and Photobiology)
Source: Photochemistry and Photobiology - December 11, 2023 Category: Science Authors: David Kessel Tags: CORRESPONDENCE Source Type: research
Photocatalytic fixation and oxygenation of NAD+/NADP+ and sulfides using solar light: Exploring mechanistic investigations and their impact on synthetic applications
This study focuses on the creation and implementation of a sulfur-doped photocatalyst for direct fine chemical regeneration and organic transformation. (Source: Photochemistry and Photobiology)
Source: Photochemistry and Photobiology - December 7, 2023 Category: Science Authors: Ravindra K. Shukla,
Rajesh K. Yadav,
Vittal L. Gole,
Satyam Singh,
Navneet Kumar Gupta,
Jin ‐Ook Baeg Tags: RESEARCH ARTICLE Source Type: research
Theoretical insights into the photophysics of an unnatural base Z: A MS ‐CASPT2 investigation
The photophysics of an unnatural base Z is investigated in detail with high level MS-CASPT2 method. AbstractWe have employed the highly accurate multistate complete active space second-order perturbation theory (MS-CASPT2) method to investigate the photoinduced excited state relaxation properties of one unnatural base, namely Z. Upon excitation to the S2 state of Z, the internal conversion to the S1 state would be dominant. From the S1 state, two intersystem crossing paths leading to the T2 and T1 states and one internal conversion path to the S0 state are possible. However, considering the large barrier to access the S1/S...
Source: Photochemistry and Photobiology - December 2, 2023 Category: Science Authors: Xin ‐Rui Chen,
Wen‐Jun Jiang,
Qian‐Hong Guo,
Xiang‐Yang Liu,
Ganglong Cui,
Laicai Li Tags: SPECIAL ISSUE RESEARCH ARTICLE Source Type: research
The public ‐health significance of far‐UVC‐induced indoor ozone and its associated secondary chemistry
Far-UVC (around 220 nm) produces very low levels of ozone—in real-world indoor rooms compliant with far-UVC dose limits, far-UVC-induced ozone levels are<<10 ppb. At these very low ozone levels, there is no epidemiological evidence of increased health risks from any of the very large outdoor ozone studies Indoors, at the low ozone concentrations of relevance here, ozone does not react rapidly enough with preexisting airborne volatile organic compounds to compete with even extremely low levels of room ventilation, so significant ozone-induced ultrafine particle production is very unlikely. Direct measurements ...
Source: Photochemistry and Photobiology - December 1, 2023 Category: Science Authors: David J. Brenner Tags: INVITED REVIEW Source Type: research
Electronic relaxation mechanism of 9 ‐methyl‐2,6‐diaminopurine and 2,6‐diaminopurine‐2′‐deoxyribose in solution
The photophysics and electronic relaxation mechanism of 2,6-diaminopurine-2 ′-deoxyribose and 9-methyl-2,6-diaminopurine is experimentally and computationally investigated in acetonitrile and aqueous solution. The relaxation mechanism includes deactivation through C2- and C6-reaction coordinates and involves two conical intersections. Longer lifetimes are observed in aque ous solution than in acetonitrile and trapping of the population in the S1( ππ*) is more efficient in 2,6-diaminopurine-2′-deoxyribose than in 9-methyl-2,6-diaminopurine. Collectively, it is demonstrated that prebiotic 2,6-diaminopurine could have a...
Source: Photochemistry and Photobiology - November 29, 2023 Category: Science Authors: Luis A. Ortiz ‐Rodríguez,
Naishka E. Caldero‐Rodríguez,
Sourav Kanti Seth,
Karitza Díaz‐González,
Carlos E. Crespo‐Hernández Tags: SPECIAL ISSUE RESEARCH ARTICLE Source Type: research
Simultaneous irradiation of 660 and 808 nm on gingival epithelial cells and fibroblasts induces different patterns of oxidative/antioxidative activities: What is the role of the cell type and irradiation parameters?
In conclusion, simultaneous and consecutive irradiation induced distinct oxidative stress modulation in oral epithelial cells and fibroblasts. The imbalance in the oxidative system observed after longer exposures, allied with the absence of a significant increase in the viability of the two cell types, suggests a contraindication for longer simultaneous irradiation in c linical situations that demand cellular stimulation. (Source: Photochemistry and Photobiology)
Source: Photochemistry and Photobiology - November 28, 2023 Category: Science Authors: Anaeliza Figueiredo dos Santos,
Fl ávia Cristina Rosin Prado,
Cristina de Paula Novaes,
Ana Carolina de Magalhães,
Maria Cristina Zindel Deboni,
Luciana Corrêa Tags: RESEARCH ARTICLE Source Type: research
Chemoselective light ‐induced reactivity of β‐enaminones
Ring size controls the photochemical reactivity of β-enaminones. AbstractThe irradiation of β-enaminones, generated in situ from cyclic 1,3-diketones and activated alkenes leads to polyheterocyclic skeletons. The photoproduct chemoselectivity depends on the type of cyclic 1,3-diketones employed viz., 2-acetylcyclopentanone and 2-acetylcyclohexanone. The observed chemoselectivity was rati onalized based on the Dieckmann-Kon rule. (Source: Photochemistry and Photobiology)
Source: Photochemistry and Photobiology - November 27, 2023 Category: Science Authors: Lakshmy Kannadi Valloli,
Kavyasree Manal,
Brieanna Lewis,
Steffen Jockusch,
Jayaraman Sivaguru Tags: SPECIAL ISSUE RESEARCH ARTICLE Source Type: research
Issue Information
(Source: Photochemistry and Photobiology)
Source: Photochemistry and Photobiology - November 24, 2023 Category: Science Tags: Issue Information Source Type: research
Charles J. Gomer: PDT and beyond
(Source: Photochemistry and Photobiology)
Source: Photochemistry and Photobiology - November 24, 2023 Category: Science Authors: David Kessel,
Tayyaba Hasan Tags: EDITORIAL Source Type: research
Comparison of five retinoids for anti ‐photoaging therapy: Evaluation of anti‐inflammatory and anti‐oxidative activities in vitro and therapeutic efficacy in vivo
This study aimed to determine the optimal retinoid type(s) for anti-photoaging therapy both in vitro and in vivo. Our data demonstrated that four retinoids (RPalm, RP, HPR and ROL) but not RAc were effective for anti-photoaging treatment at 5 μg/mL in vitro, with action mechanisms associated with antioxidative, anti-inflammatory and anti-skin ECM degradation activities. Notably, both R Palm and RP appeared superior to HPR and ROL for those activities. Importantly, both RPalm and RP were shown to be optimal for anti-photoaging therapy when topically applied at 5 mg/kg in a UVB-induced mice model of photoaging, whic...
Source: Photochemistry and Photobiology - November 22, 2023 Category: Science Authors: Peng Shu, Ling Jiang, Menggeng Li, Yi Li, Zhengqiang Yuan, Li Lin, Ju Wen, Haji Akber Aisa, Zhiyun Du Tags: RESEARCH ARTICLE Source Type: research
