Photochemical & Photobiological Sciences最新文献

Machine learning-based bioactivity prediction of porphyrin derivatives: molecular descriptors, clustering, and model evaluation. 基于机器学习的卟啉衍生物生物活性预测：分子描述符、聚类和模型评估。

IF 2.7 3区化学

Photochemical & Photobiological Sciences Pub Date : 2025-05-15 DOI: 10.1007/s43630-025-00733-8

Tugba Muhlise Okyay, Ibrahim Yilmaz, Macit Koldas

{"title":"Machine learning-based bioactivity prediction of porphyrin derivatives: molecular descriptors, clustering, and model evaluation.","authors":"Tugba Muhlise Okyay, Ibrahim Yilmaz, Macit Koldas","doi":"10.1007/s43630-025-00733-8","DOIUrl":"https://doi.org/10.1007/s43630-025-00733-8","url":null,"abstract":"Understanding the relationship between molecular structure and bioactivity is crucial for optimizing porphyrin-based therapeutics. By integrating cheminformatics techniques with machine learning models, our work enables the efficient classification of compounds based on their molecular structures and their growth inhibition capabilities (IC50). A dataset of 317 porphyrin derivatives was compiled, incorporating molecular descriptors and biological activity data. Descriptive statistical analysis was performed to examine compound distribution and key features. Clustering analysis was conducted using hierarchical clustering and fingerprint similarity matrices to classify compounds based on structural similarity. Lipinski's Rule of Five was applied to assess drug-likeness, while Murcko scaffold analysis identified core structural patterns. Tumor response data were analyzed to evaluate therapeutic efficacy. Machine learning models were implemented to predict bioactivity. Descriptive statistics highlighted bioactive compounds, with TMPyP4 and Temaporfin being the most studied. Quantitative estimation of drug-likeness and the number of aliphatic carboxylic acids were identified as the most influential descriptors among others for bioactivity. Hierarchical clustering segmented porphyrins into nine structural groups. The analysis identified 168 pIC50 active compounds, with 31 meeting Lipinski's criteria, and 11 overlapping as both effective and bioavailable. Tumor response analysis revealed three porphyrins achieving 100% response. Logistic Regression emerged as the best-performing model, achieving 83% accuracy, demonstrating robust predictive capabilities. This study successfully characterized porphyrin derivatives, reviewing key molecular features influencing bioactivity and evaluating their therapeutic potential. It highlights the potential of machine learning in predicting the biological activity status of porphyrin derivatives.","PeriodicalId":98,"journal":{"name":"Photochemical & Photobiological Sciences","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144075050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dermatological effects of acute and long-term UV-C exposure: an in vivo study using a portable mercury lamp. 急性和长期UV-C暴露的皮肤病学影响：使用便携式汞灯的体内研究。

IF 2.7 3区化学

Photochemical & Photobiological Sciences Pub Date : 2025-05-14 DOI: 10.1007/s43630-025-00732-9

Christina Karampasi, Ioannis Sfiniadakis, Aspasia Petri, Michail Rallis

{"title":"Dermatological effects of acute and long-term UV-C exposure: an in vivo study using a portable mercury lamp.","authors":"Christina Karampasi, Ioannis Sfiniadakis, Aspasia Petri, Michail Rallis","doi":"10.1007/s43630-025-00732-9","DOIUrl":"https://doi.org/10.1007/s43630-025-00732-9","url":null,"abstract":"Following the COVID-19 pandemic, portable UV-C radiation sources for disinfection have become increasingly available and integrated into daily life. UV-C devices emitting at 254 nm (mercury lamps) affect skin and eyes, usually causing erythema, burns or photokeratitis. Despite safety recommendations, misuse or accidental exposure remains a risk. Most data on UV-C effects come from cases of accidental overexposure in fixed installations, while portable devices involve different exposure geometry. Users hold the source close throughout the disinfection process, exposing themselves to both direct and reflected UV-C radiation. An in vivo study using male SKH-hr1 mice was conducted in two stages to assess the effects of skin exposure to UV-C radiation from a commercial disinfection device (Hg lamp, 253.7 nm, 5 Wm-2) under realistic conditions of use. In the first stage, single irradiation doses of 5 Jm-2, 15 Jm-2, 30 Jm-2, 45 Jm-2 and 60 Jm-2 were used to determine the minimum erythemal dose. Doses of 45 Jm-2 and 60 Jm-2 caused irritation and signs of skin aging including reduced elasticity, wrinkling and dry skin. Based on these findings, the second stage assessed long-term effects with repeated exposures of 45 Jm-2, 60 Jm-2, and 100 Jm-2, irradiating mice 5 times per week for 25 days. Progressive skin damage escalated from mild irritation to significant thickening and premature aging, culminating in erythematous papules indicative of actinic hyperkeratosis. These findings demonstrate that both acute and long-term exposure to UV-C radiation can cause significant skin damage, emphasizing the need for strict adherence to safety guidelines.","PeriodicalId":98,"journal":{"name":"Photochemical & Photobiological Sciences","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143952304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The oxidative effect of duckweed pond DOM and its mechanism in the photodegradation of neonicotinoid insecticides. 浮萍池塘DOM的氧化作用及其光降解新烟碱类杀虫剂的机理。

IF 2.7 3区化学

Photochemical & Photobiological Sciences Pub Date : 2025-05-14 DOI: 10.1007/s43630-025-00734-7

Yasi Wan, Hao Liu, Liqing Li

{"title":"The oxidative effect of duckweed pond DOM and its mechanism in the photodegradation of neonicotinoid insecticides.","authors":"Yasi Wan, Hao Liu, Liqing Li","doi":"10.1007/s43630-025-00734-7","DOIUrl":"https://doi.org/10.1007/s43630-025-00734-7","url":null,"abstract":"Neonicotinoid pesticides (NNIs) are widely used worldwide and commonly detected in natural aquatic systems and in engineered systems, including urban or agriculture ponds. We investigated the photoreactivity of DOM and the photodegradation of NNIs in duckweed ponds (DWP) water under simulated sunlight. The molecular composition of DOM in DWP water typically contained more than 65% bulk compositional measurements of lignin-like, terrestrially derived molecules, revealed by Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS). These compounds serve as critical candidates for the oxidizing 3DOM* in the DWP water. The steady-state concentrations of triplet-excited state DOM (3DOM*), singlet oxygen (1O2) and hydroxyl radical (·OH) were measured 6.00 × 10-14 M, 5.42 × 10-13 M, and 8.33 × 10-15 M, respectively, under 5 mg/L [DOC]. Enhanced removal rates of thiamethoxam (TMX) and dinotefuran (DIN) in the irradiated DWP water relative to the purity water demonstrated the importance of indirect photolysis pathways involving photochemically produced 3DOM*and 1O2. The findings demonstrated that in DWP water, the photolysis rate constants (k) of TMX and DIN increased to 0.3573 h-1 and 0.3237 h-1, respectively. Degradation of imidacloprid was not significantly promoted through the photochemical production of 3DOM* and 1O2. Results from this study underscore the role of DOM as photosensitizer in limiting the persistence of NNIs in duckweed ponds through photochemical reactions.","PeriodicalId":98,"journal":{"name":"Photochemical & Photobiological Sciences","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144075172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An investigation into eye protection for patients receiving oral psoralen photochemotherapy (PUVA). 口服补骨脂素光化学治疗（PUVA）患者眼部保护的研究。

IF 2.7 3区化学

Photochemical & Photobiological Sciences Pub Date : 2025-05-01 Epub Date: 2025-05-06 DOI: 10.1007/s43630-025-00714-x

Mingkai Wang, Robert Dawe, Sally Ibbotson, Ewan Eadie

{"title":"An investigation into eye protection for patients receiving oral psoralen photochemotherapy (PUVA).","authors":"Mingkai Wang, Robert Dawe, Sally Ibbotson, Ewan Eadie","doi":"10.1007/s43630-025-00714-x","DOIUrl":"10.1007/s43630-025-00714-x","url":null,"abstract":"This study investigates the effectiveness of ultraviolet (UV) protection provided by various types of glasses for patients who have orally ingested psoralen. Psoralen is administered orally by patients, as part of PUVA photochemotherapy, 2 h prior to ultraviolet-A exposure. For 12-24 h post psoralen ingestion, there is a potential risk of ocular damage from solar UV (Lerman et al. in J Investig Dermatol 74(4):197-199, 1980). The patients must, therefore, wear eye protection during this period. The purpose of this study was to evaluate the effectiveness of commonly used eyewear for ocular protection during PUVA therapy. A range of glasses, including commercially available sunglasses, prescription sunglasses, prescription glasses without UV protection, and UV protective eyewear, were evaluated. The UV transmission rates of the lenses were measured using a spectrophotometer, followed by a spectroradiometer experiment with a UVA light source to assess the relative UV exposure of the eyewear. The results indicate that while standard UV-protective glasses effectively block UV transmission through the lens, real-world scenarios reveal that inadequate frame coverage can significantly reduce overall eye protection. This highlights the limitation of relying solely on lens transmission as a measure of protection and underscores the critical role of selecting well-designed frames with proper fit for patients during psoralen photosensitisation.","PeriodicalId":98,"journal":{"name":"Photochemical & Photobiological Sciences","volume":" ","pages":"705-713"},"PeriodicalIF":2.7,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143956194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Challenges and insights in detecting early inflammation in DSS-induced colitis using chemiluminescence. 化学发光检测dss诱导结肠炎早期炎症的挑战和见解。

IF 2.7 3区化学

Photochemical & Photobiological Sciences Pub Date : 2025-05-01 DOI: 10.1007/s43630-025-00724-9

Paulína Belvončíková, Barbora Gromová, Roman Gardlík, Barbora Tamášová

{"title":"Challenges and insights in detecting early inflammation in DSS-induced colitis using chemiluminescence.","authors":"Paulína Belvončíková, Barbora Gromová, Roman Gardlík, Barbora Tamášová","doi":"10.1007/s43630-025-00724-9","DOIUrl":"10.1007/s43630-025-00724-9","url":null,"abstract":"Background: Ulcerative colitis (UC) is a complex inflammatory condition with limited non-invasive tools to monitor early-stage inflammation. This study aimed to investigate the early stages of inflammation in acute and chronic murine models of dextran sulfate sodium (DSS)-induced colitis using in vivo and ex vivo chemiluminescence imaging.Methods: Two DSS-induced colitis models were used: an acute model over 7 days and a chronic model over 6 weeks. Body weight, stool consistency, and fecal occult blood (FOB) tests were monitored. Chemiluminescence imaging was used to assess inflammation in vivo and ex vivo, complemented by colonoscopy in the chronic model.Results: In the acute model, DSS-treated mice exhibited weight loss, colon shortening, and positive FOB tests by day 7. Ex vivo chemiluminescence signals exhibited a significant increase as early as day 5 (p < 0.001), while in vivo imaging showed minimal changes. In the chronic model, periodic DSS exposure resulted in recurrent inflammation, with positive FOB tests and significantly elevated ex vivo and in vivo chemiluminescence signals during the final DSS cycle (p < 0.05). Colonoscopy confirmed inflammation progression.Discussion: This study demonstrates the progression of inflammation in acute and chronic colitis models. However, in vivo chemiluminescence imaging did not reliably detect the onset of inflammation, limiting its application for early-stage disease detection. Ex vivo chemiluminescence and FOB tests provided more consistent insights into inflammation dynamics, addressing the need for improved non-invasive monitoring tools in UC research.","PeriodicalId":98,"journal":{"name":"Photochemical & Photobiological Sciences","volume":" ","pages":"765-777"},"PeriodicalIF":2.7,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143955075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Highly fluorescent new Schiff base chemosensors for the selective detection of Cu(II) and their application in bioimaging technique. 高荧光新型希夫碱化学传感器选择性检测Cu（II）及其在生物成像技术中的应用。

IF 2.7 3区化学

Photochemical & Photobiological Sciences Pub Date : 2025-05-01 Epub Date: 2025-05-03 DOI: 10.1007/s43630-025-00719-6

Karikalan Abinaya, Thamaraichelvan Geetha, Sambamoorthy Santhi, Sathiyamoorthi Sowbakya, Subbiah Amala

{"title":"Highly fluorescent new Schiff base chemosensors for the selective detection of Cu(II) and their application in bioimaging technique.","authors":"Karikalan Abinaya, Thamaraichelvan Geetha, Sambamoorthy Santhi, Sathiyamoorthi Sowbakya, Subbiah Amala","doi":"10.1007/s43630-025-00719-6","DOIUrl":"10.1007/s43630-025-00719-6","url":null,"abstract":"A new symmetrical and a new unsymmetrical Schiff bases are synthesized by condensing 1-(2,4-dihydroxyphenyl)ethanone with, Naphthalen-1-amine and Naphthalen-1,8-diamine under solvent free condition and characterized by IR, UV-visible, 1H NMR, 13C NMR and mass spectral studies. Cation recognizing potentiality of both the Schiff bases is explored-of the Schiff base 4-(1-(naphthalen-1-ylimino)ethyl)benzene-1,3-diol (NEBD) in aqueous methanolic medium and of Schiff base 4,4'-((naphthalene-1,8-diylbis(azanylylidene))bis(ethan-1-yl-1-ylidene))bis(benzene-1,3-diol) (NDBD) is scrutinized in aqueous ACN medium through dual modes namely absorption and emission methods. Both the Schiff base sensors are found to detect Cu(II) ion selectively. The detection occurs in an off-on mode (increase of emission intensity of the Schiff base in the presence of Cu(II) ion) and on-off mode (decrease of emission intensity of the Schiff base in the presence of Cu(II) ion) for the Schiff bases NEBD and NDBD respectively. For the Schiff base NEBD LOD for Cu(II) ion is 1.528 × 10-6 M and for NDBD it is 2.871 × 10-7 M. The sensing property is applied in bioimaging technique for the detection of human cancer cells HeLa. Both the Schiff bases are screened for their antimicrobial activities. Schiff base NEBD is found to be more potential than the standard drug amphotericin B towards Aspergillus niger. Regarding Schiff base NDBD, it is as potential as the standard drug towards all the organisms studied.","PeriodicalId":98,"journal":{"name":"Photochemical & Photobiological Sciences","volume":" ","pages":"715-735"},"PeriodicalIF":2.7,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143955079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of alkyl-substituted auxiliary acceptor positioning on dyes for DSSCs with Hagfeldt donor. 烷基取代辅助受体定位对Hagfeldt供体DSSCs染料的影响。

IF 2.7 3区化学

Photochemical & Photobiological Sciences Pub Date : 2025-05-01 Epub Date: 2025-05-06 DOI: 10.1007/s43630-025-00730-x

Xing Hu, Huimin Xie, Zifeng Gu, Zulun Ma, Changyan Zhu, Ji Zhang, Hancheng Zhu

{"title":"Impact of alkyl-substituted auxiliary acceptor positioning on dyes for DSSCs with Hagfeldt donor.","authors":"Xing Hu, Huimin Xie, Zifeng Gu, Zulun Ma, Changyan Zhu, Ji Zhang, Hancheng Zhu","doi":"10.1007/s43630-025-00730-x","DOIUrl":"10.1007/s43630-025-00730-x","url":null,"abstract":"The introduction of an auxiliary acceptor into donor/acceptor dye systems is one of the most widely used strategies to enhance the light-harvesting properties of dye-sensitized solar cells. However, our understanding of the effects of these auxiliary acceptors remains limited. In this study, we utilize two organic dyes that differ in the positioning of the auxiliary acceptor to explore their impacts on several important factors associated with short-circuit current density and open-circuit photovoltage. These parameters include light-harvesting ability, electron injection, conduction band energy shift and charge recombination. Contrary to common assumptions, we find that the positioning of the alkyl-substituted auxiliary acceptor affects not just the light-harvesting ability but also influences the charge recombination process by altering the dominant conformation of the Hagfeldt donor. Specifically, the auxiliary acceptor situated farther from the Hagfeldt donor is more effective in enhancing the dye's light-harvesting ability compared to those located near the donor end. Conversely, when the auxiliary acceptor is positioned near the Hagfeldt donor and introduces alkyl chains on one side, the two benzene rings substituted with alkoxy groups in the Hagfeldt donor tend to interact with the alkyl chain of the auxiliary acceptor. This interaction hinders the surface protection effect of the Hagfeldt donor and reduces its inhibitory effect on the electron recombination process. These new insights into the effects of alkyl-substituted auxiliary acceptors on inhibiting charge recombination through their influence on the dominant conformation of the Hagfeldt donor opens avenues for the systematic design of high-performance sensitizers.","PeriodicalId":98,"journal":{"name":"Photochemical & Photobiological Sciences","volume":" ","pages":"827-845"},"PeriodicalIF":2.7,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143952306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigating the wound healing potential of low-power 661 nm laser light in a pigmented hairless murine model. 研究低功率661nm激光在无毛染色小鼠模型中的伤口愈合潜力。

IF 2.7 3区化学

Photochemical & Photobiological Sciences Pub Date : 2025-05-01 Epub Date: 2025-05-08 DOI: 10.1007/s43630-025-00725-8

Dimitra Statha, Ioannis Sfiniadakis, Michail Rallis, Jane Anastassopoulou, Eleni Alexandratou

{"title":"Investigating the wound healing potential of low-power 661 nm laser light in a pigmented hairless murine model.","authors":"Dimitra Statha, Ioannis Sfiniadakis, Michail Rallis, Jane Anastassopoulou, Eleni Alexandratou","doi":"10.1007/s43630-025-00725-8","DOIUrl":"10.1007/s43630-025-00725-8","url":null,"abstract":"Photobiomodulation (PBM) has emerged as a promising method for enhancing wound healing. However, a standardized therapeutic protocol has not yet been established. This study aimed to determine the optimal irradiation parameters for wound healing in pigmented hairless mice (SKH-hr2). Mice were irradiated daily with energy doses of 2 or 4 J/cm2, achieved with different power densities in each group: 20, 50, or 100 mW/cm2. Various methods were used to evaluate the therapeutic efficacy, including histopathological analysis, clinical observation, photo-documentation, assessment of biophysical skin parameters, and Fourier Transform infrared (FT-IR) spectroscopy. The results indicated that the most favorable outcomes regarding wound healing acceleration and inflammation reduction were achieved with an irradiation setting of 50 mW/cm2 and 2 J/cm2. However, the group subjected to prolonged irradiation times with a power density of 20 mW/cm2 and energy of 4 J/cm2 exhibited subcutaneous bleeding. The FT-IR spectral absorption bands of amide groups provided important molecular-level information about the secondary structure of collagen, particularly in relation to skin regeneration and the response to applied energy, in agreement with histological data. This study highlights the critical need for further investigation into the parameters of photobiomodulation to ensure its effective application to the different skin phototypes and to mitigate potential adverse effects arising from incorrect usage.","PeriodicalId":98,"journal":{"name":"Photochemical & Photobiological Sciences","volume":" ","pages":"779-790"},"PeriodicalIF":2.7,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143951628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of hydrogen-bonded biological molecules on photochemical properties of tryptophan enantiomers probed by temperature-dependent ultraviolet photodissociation spectroscopy in the gas phase. 氢键生物分子对色氨酸对映体光化学性质的影响，用温度依赖的紫外光解光谱在气相中探测。

IF 2.7 3区化学

Photochemical & Photobiological Sciences Pub Date : 2025-05-01 Epub Date: 2025-04-16 DOI: 10.1007/s43630-025-00720-z

Shunki Miyao, Akimasa Fujihara

{"title":"Effects of hydrogen-bonded biological molecules on photochemical properties of tryptophan enantiomers probed by temperature-dependent ultraviolet photodissociation spectroscopy in the gas phase.","authors":"Shunki Miyao, Akimasa Fujihara","doi":"10.1007/s43630-025-00720-z","DOIUrl":"10.1007/s43630-025-00720-z","url":null,"abstract":"The effects of hydrogen-bonded cysteine (Cys), cystine, and serine (Ser) on the photochemical properties of tryptophan (Trp) enantiomers were investigated at low temperatures in the gas phase. The difference in the relative intensity at 270-280 nm in the ultraviolet photodissociation spectra at 8 K showed that the higher excited states of H+(L-Trp) (L-Cys) were red-shifted by stronger intermolecular interactions compared to H+(D-Trp) (L-Cys). Photoexcitation of protonated Trp enantiomers hydrogen-bonded to Cys and cystine led to detachment of the hydrogen-bonded molecules. The relative abundance of the NH2CHCOOH loss from H+(D-Trp) (L-Ser) was higher than that of the loss from H+(L-Trp) (L-Ser) in the product ion spectra obtained by 285 nm photoexcitation, indicating that hydrogen bonding with L-Ser induces the enantiomer-selective photodissociation of Trp. The photodissociation spectra for the S1-S0 transition of H+(L-Trp) (L-Ser) at 8-100 K showed the conformational changes to the conformers with weaker intermolecular interactions at high temperatures. In terms of their influence on the photochemical properties of Trp enantiomers at low temperatures in the gas phase, Cys and Ser can be classified as the same type of alanine and leucine, respectively.","PeriodicalId":98,"journal":{"name":"Photochemical & Photobiological Sciences","volume":" ","pages":"737-744"},"PeriodicalIF":2.7,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143955328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Arsenic and vanadium in soils: effects on photosynthetic chain dynamics in Ocimum basilicum L. 土壤中砷和钒对罗勒木光合链动力学的影响。

IF 2.7 3区化学

Photochemical & Photobiological Sciences Pub Date : 2025-05-01 Epub Date: 2025-05-07 DOI: 10.1007/s43630-025-00729-4

Carla A Costamagna, Raúl S Lavado, Fernando V Molina, María Gabriela Lagorio

引用次数: 0