1
|
Mikulich AV, Plavskii VY, Tretyakova AI, Nahorny RK, Sobchuk AN, Dudchik NV, Emeliyanova OA, Zhabrouskaya AI, Plavskaya LG, Ananich TS, Dudinova ON, Leusenka IA, Yakimchuk SV, Svechko AD, Tien TQ, Tong QC, Nguyen TP. Potential of using medicinal plant extracts as photosensitizers for antimicrobial photodynamic therapy. Photochem Photobiol 2024. [PMID: 38456366 DOI: 10.1111/php.13935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 02/26/2024] [Accepted: 02/27/2024] [Indexed: 03/09/2024]
Abstract
Antimicrobial photodynamic therapy (APDT) is a promising approach to overcome antimicrobial resistance. However, for widespread implementation of this approach, approved photosensitizers are needed. In this study, we used commercially available preparations (Calendulae officinalis floridis extract, Chamomillae recutitae floridis extract, Achillea millefolii herbae extract; Hypericum perforatum extract; Eucalyptus viminalis folia extract) as photosensitizers for inactivation of gram-negative (Pseudomonas aeruginosa) and gram-positive (Staphylococcus aureus) bacteria. Spectral-luminescent analysis has shown that the major chromophores are of chlorophyll (mainly chlorophyll a and b) and hypericin nature. The extracts are efficient generators of singlet oxygen with quantum yield (γΔ ) from 0.40 to 0.64 (reference compound, methylene blue with γΔ = 0.52). In APDT assays, bacteria before irradiation were incubated with extracts for 30 min. After irradiation and 24 h of incubation, colony-forming units (CFU) were counted. Upon exposure of P. aeruginosa to radiation of 405 nm, 590 nm, and 660 nm at equal energy dose of 30 J/cm2 (irradiance - 100 mW/cm2 , exposure time - 5 min), the most pronounced effect is observed with blue light (>3 log10 reduction); in case of S. aureus, the effect is approximately equivalent for light of indicated wavelengths and dose (>4 log10 reduction).
Collapse
Affiliation(s)
- Aliaksandr V Mikulich
- State Scientific Institution "B.I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus", Minsk, Republic of Belarus
| | - Vitaly Yu Plavskii
- State Scientific Institution "B.I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus", Minsk, Republic of Belarus
| | - Antonina I Tretyakova
- State Scientific Institution "B.I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus", Minsk, Republic of Belarus
| | - Raman K Nahorny
- State Scientific Institution "B.I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus", Minsk, Republic of Belarus
| | - Andrey N Sobchuk
- State Scientific Institution "B.I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus", Minsk, Republic of Belarus
| | - Natalia V Dudchik
- Republican Unitary Enterprise «Scientific Practical Centre of Hygiene», Minsk, Republic of Belarus
| | - Olga A Emeliyanova
- Republican Unitary Enterprise «Scientific Practical Centre of Hygiene», Minsk, Republic of Belarus
| | - Anastasia I Zhabrouskaya
- Republican Unitary Enterprise «Scientific Practical Centre of Hygiene», Minsk, Republic of Belarus
| | - Ludmila G Plavskaya
- State Scientific Institution "B.I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus", Minsk, Republic of Belarus
| | - Tatsiana S Ananich
- State Scientific Institution "B.I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus", Minsk, Republic of Belarus
| | - Olga N Dudinova
- State Scientific Institution "B.I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus", Minsk, Republic of Belarus
| | - Ihar A Leusenka
- State Scientific Institution "B.I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus", Minsk, Republic of Belarus
| | - Sergey V Yakimchuk
- State Scientific Institution "B.I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus", Minsk, Republic of Belarus
| | - Alexei D Svechko
- State Scientific Institution "B.I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus", Minsk, Republic of Belarus
| | - Tran Quoc Tien
- Institute of Materials Science, Vietnam Academy of Science and Technology, Hanoi, Vietnam
| | - Quang Cong Tong
- Institute of Materials Science, Vietnam Academy of Science and Technology, Hanoi, Vietnam
| | - Thanh Phuong Nguyen
- School of Engineering Physics, Hanoi University of Science and Technology, Hanoi, Vietnam
| |
Collapse
|
2
|
Wang M, Lilly K, Martin LMA, Xu W, Tamamis P, Phillips TD. Adsorption and removal of polystyrene nanoplastics from water by green-engineered clays. WATER RESEARCH 2024; 249:120944. [PMID: 38070346 DOI: 10.1016/j.watres.2023.120944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 11/24/2023] [Accepted: 11/28/2023] [Indexed: 01/03/2024]
Abstract
Human exposure to micro- and nanoplastics (MNPs) commonly occurs through the consumption of contaminated drinking water. Among these, polystyrene (PS) is well-characterized and is one of the most abundant MNPs, accounting for 10 % of total plastics. Previous studies have focused on carbonaceous materials to remove MNPs by filtration, but most of the work has involved microplastics since nanoplastics (NPs) are smaller in size and more difficult to measure and remove. To address this need, green-engineered chlorophyll-amended sodium and calcium montmorillonites (SMCH and CMCH) were tested for their ability to bind and detoxify parent and fluorescently labeled PSNP using in vitro, in silico, and in vivo assays. In vitro dosimetry, isothermal analyses, thermodynamics, and adsorption/desorption kinetic models demonstrated 1) high binding capacities (173-190 g/kg), 2) high affinities (103), and 3) chemisorption as suggested by low desorption (≤42 %) and high Gibbs free energy and enthalpy (>|-20| kJ/mol) in the Langmuir and pseudo-second-order models. Computational dynamics simulations for 30 and 40 monomeric units of PSNP depicted that chlorophyll amendments increased the binding percentage and contributed to the sustained binding. Also, 64 % of PSNP bind to both the head and tail of chlorophyll aggregates, rather than the head or tail only. Fluorescent PSNP at 100 nm and 30 nm that were exposed to Hydra vulgaris showed concentration-dependent toxicity at 20-100 µg/mL. Importantly, the inclusion of 0.05-0.3 % CMCH and SMCH significantly (p ≤ 0.01) and dose-dependently reduced PSNP toxicity in morphological changes and feeding rate. The bioassay validated the in vitro and in silico predictions about adsorption efficacy and mechanisms and suggested that CMCH and SMCH are efficacious binders for PSNP in water.
Collapse
Affiliation(s)
- Meichen Wang
- Department of Veterinary Physiology and Pharmacology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA; Interdisciplinary Faculty of Toxicology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA
| | - Kendall Lilly
- Department of Materials Science and Engineering, College of Engineering, Texas A&M University, College Station, TX 77843, USA; Artie McFerrin Department of Chemical Engineering, College of Engineering, Texas A&M University, College Station, TX 77843, USA
| | - Leisha M A Martin
- Department of Life Sciences, Texas A&M University, Corpus Christi, TX 78412, USA
| | - Wei Xu
- Department of Life Sciences, Texas A&M University, Corpus Christi, TX 78412, USA
| | - Phanourios Tamamis
- Department of Materials Science and Engineering, College of Engineering, Texas A&M University, College Station, TX 77843, USA; Artie McFerrin Department of Chemical Engineering, College of Engineering, Texas A&M University, College Station, TX 77843, USA
| | - Timothy D Phillips
- Department of Veterinary Physiology and Pharmacology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA; Interdisciplinary Faculty of Toxicology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA.
| |
Collapse
|
3
|
Speghini R, Buscato C, Marcato S, Fortunati I, Baldan B, Ferrante C. Response of Coccomyxa cimbrica sp.nov. to Increasing Doses of Cu(II) as a Function of Time: Comparison between Exposure in a Microfluidic Device or with Standard Protocols. BIOSENSORS 2023; 13:bios13040417. [PMID: 37185492 PMCID: PMC10135970 DOI: 10.3390/bios13040417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Revised: 03/20/2023] [Accepted: 03/20/2023] [Indexed: 05/17/2023]
Abstract
In this study, we explore how the in vitro conditions chosen to cultivate and observe the long-term (up to 72 h) toxic effect of Cu(II) on the freshwater microalga Coccomyxa cimbrica sp.nov. can affect the dose response in time. We test three different cultivation protocols: (i) under static conditions in sealed glass cells, (ii) in a microfluidic device, where the sample is constantly circulated with a peristaltic pump, and (iii) under continuous agitation in plastic falcons on an orbital shaker. The advantage and novelty of this study resides in the fact that each condition can mimic different environmental conditions that alga cells can find in nature. The effect of increasing dose of Cu(II) as a function of time (24, 48, and 72 h) is monitored following chlorophyll a fluorescence intensity from single cells. Fluorescence lifetime imaging experiments are also explored to gain information on the changes induced by Cu(II) in the photosynthetic cycle of this microalga.
Collapse
Affiliation(s)
- Riccardo Speghini
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, 35131 Padova, Italy
| | - Carlo Buscato
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, 35131 Padova, Italy
| | - Stefania Marcato
- Dipartimento di Biologia, Università degli Studi di Padova, 35131 Padova, Italy
| | - Ilaria Fortunati
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, 35131 Padova, Italy
| | - Barbara Baldan
- Dipartimento di Biologia, Università degli Studi di Padova, 35131 Padova, Italy
| | - Camilla Ferrante
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, 35131 Padova, Italy
| |
Collapse
|
4
|
Rivenbark KJ, Wang M, Lilly K, Tamamis P, Phillips TD. Development and characterization of chlorophyll-amended montmorillonite clays for the adsorption and detoxification of benzene. WATER RESEARCH 2022; 221:118788. [PMID: 35777320 PMCID: PMC9662585 DOI: 10.1016/j.watres.2022.118788] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Revised: 06/20/2022] [Accepted: 06/21/2022] [Indexed: 06/15/2023]
Abstract
After disasters, such as forest fires and oil spills, high levels of benzene (> 1 ppm) can be detected in the water, soil, and air surrounding the disaster site, which poses a significant health risk to human, animal, and plant populations in the area. While remediation methods with activated carbons have been employed, these strategies are limited in their effectiveness due to benzene's inherent stability and limited retention to most surfaces. To address this problem, calcium and sodium montmorillonite clays were amended with a mixture of chlorophyll (a) and (b); their binding profile and ability to detoxify benzene were characterized using in vitro, in silico, and well-established ecotoxicological (ecotox) bioassay methods. The results of in vitro isothermal analyses indicated that chlorophyll-amended clays showed an improved binding profile in terms of an increased binding affinity (Kf = 668 vs 67), increased binding percentage (52% vs 11%), and decreased rates of desorption (28% vs 100%), compared to the parent clay. In silico simulation studies elucidated the adsorption mechanism and validated that the addition of the chlorophyll to the clays increased the adsorption of benzene through Van der Waals forces (i.e., aromatic π-π stacking and alkyl-π interactions). The sorbents were also assessed for their safety and ability to protect sensitive ecotox organisms (Lemna minor and Caenorhabditis elegans) from the toxicity of benzene. The inclusion of chlorophyll-amended clays in the culture medium significantly reduced benzene toxicity to both organisms, protecting C. elegans by 98-100% from benzene-induced mortality and enhancing the growth rates of L. minor. Isothermal analyses, in silico modeling, and independent bioassays all validated our proof of concept that benzene can be sequestered, tightly bound, and stabilized by chlorophyll-amended montmorillonite clays. These novel sorbents can be utilized during disasters and emergencies to decrease unintentional exposures from contaminated water, soil, and air.
Collapse
Affiliation(s)
- Kelly J Rivenbark
- Interdisciplinary Faculty of Toxicology, Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA
| | - Meichen Wang
- Interdisciplinary Faculty of Toxicology, Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA
| | - Kendall Lilly
- Department of Materials Science and Engineering, College of Engineering, Texas A&M University, College Station, TX 77843, USA
| | - Phanourios Tamamis
- Department of Materials Science and Engineering, College of Engineering, Texas A&M University, College Station, TX 77843, USA; Artie McFerrin Department of Chemical Engineering, College of Engineering, Texas A&M University, College Station, TX 77843, USA
| | - Timothy D Phillips
- Interdisciplinary Faculty of Toxicology, Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA.
| |
Collapse
|
5
|
Optimizing homogenizer-assisted extraction of chlorophylls from plantain epicarp (Musa paradisiaca L.). JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION 2021. [DOI: 10.1007/s11694-020-00703-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
6
|
Supramolecular chlorophyll aggregates inspired from specific light-harvesting antenna “chlorosome”: Static nanostructure, dynamic construction process, and versatile application. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C: PHOTOCHEMISTRY REVIEWS 2020. [DOI: 10.1016/j.jphotochemrev.2020.100385] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
|
7
|
Janik-Zabrotowicz E, Arczewska M, Prochniewicz P, Świetlicka I, Terpiłowski K. Stability of Chlorophyll a Monomer Incorporated into Cremophor EL Nano-Micelles under Dark and Moderate Light Conditions. Molecules 2020; 25:E5059. [PMID: 33143338 PMCID: PMC7672595 DOI: 10.3390/molecules25215059] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Revised: 10/23/2020] [Accepted: 10/27/2020] [Indexed: 01/10/2023] Open
Abstract
In this paper, stability of chlorophyll a monomers encapsulated into the Cremophor EL nano-micelles was studied under dark and moderate light conditions, typical of a room with natural or artificial lighting, in the presence of oxygen. The pigment stability against visible light was determined using the dynamic light scattering and molecular spectroscopy (UV-Vis absorption and stationary fluorescence) methods. Chlorophyll a, at the molar concentration of 10-5 M, was dissolved in the 5 wt% Cremophor emulsion for comparison in the ethanolic solution. The stability of such a self-assembly pigment-detergent nano-system is important in the light of its application on the commercial-scale. The presented results indicate the high stability of the pigment monomeric molecular organization in the nano-emulsion. During the storage in the dark, the half-lifetime was calculated as about 7 months. Additionally, based on the shape of absorption and fluorescence emission spectra, chlorophyll aggregation in the Cremophor EL aqueous solution along with the time was excluded. Moreover, the average size of detergent micelles as chlorophyll carriers was not affected after 70 days of the nano-system storage. Pigment stability against the moderate white light (0.1 mW) did not differ significantly from storage conditions in the dark. The photooxidation products, detected by occurrence of new absorption and fluorescence emission bands, was estimated on the negligible level. The stability of such a self-assembly pigment-detergent nano-system would potentially broaden the field of chlorophyll a (chl a) application in the food industry, medicine or artificial photosynthesis models.
Collapse
Affiliation(s)
- Ewa Janik-Zabrotowicz
- Department of Cell Biology, Institute of Biological Sciences, Maria Curie-Sklodowska University, Akademicka 19, 20–033 Lublin, Poland;
| | - Marta Arczewska
- Department of Biophysics, University of Life Sciences in Lublin, Akademicka 13, 20–950 Lublin, Poland;
| | - Patrycja Prochniewicz
- Department of Cell Biology, Institute of Biological Sciences, Maria Curie-Sklodowska University, Akademicka 19, 20–033 Lublin, Poland;
| | - Izabela Świetlicka
- Department of Biophysics, University of Life Sciences in Lublin, Akademicka 13, 20–950 Lublin, Poland;
| | - Konrad Terpiłowski
- Department of Physical Chemistry-Interfacial Phenomena, Maria Curie-Sklodowska University, 3, 20–031 Lublin, Poland;
| |
Collapse
|
8
|
Janik-Zabrotowicz E, Arczewska M, Zubik M, Terpilowski K, Skrzypek TH, Swietlicka I, Gagos M. Cremophor EL Nano-Emulsion Monomerizes Chlorophyll a in Water Medium. Biomolecules 2019; 9:biom9120881. [PMID: 31888249 PMCID: PMC6995590 DOI: 10.3390/biom9120881] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 12/06/2019] [Accepted: 12/14/2019] [Indexed: 12/15/2022] Open
Abstract
In this paper, the application of a non-ionic detergent Cremophor EL for monomerization of chlorophyll a in an aqueous medium is studied. The spectrophotometric properties of chlorophyll a encapsulated into the Cremophor EL nano-emulsion system were characterized by electronic absorption, steady-state and time-resolved fluorescence as well as circular dichroism spectroscopy. The results have shown that chlorophyll a dissolves more efficiently in the aqueous medium containing low-level Cremophor (5 wt%) than at an ethanolic solution even in the concentration of 10−4 M. The molecular organization of the chlorophyll a in the Cremophor EL nano-micelles was also investigated by means of Raman spectroscopy. The spectral changes in the frequency of the C=O stretching group were used to distinguish the aggregation state of chlorophyll. It was revealed that chlorophyll a exists dominantly in the monomeric form in the Cremophor EL aqueous solution. The promising aspect of the use of Cremophor EL nano-emulsion as a delivery system is to maintain stable chlorophyll monomer in an aqueous medium. It would open the potential for a new, practical application of chlorophyll a in medicine, as a dietary supplement or studies on molecular organization of chlorophyll a in the well-defined artificial system.
Collapse
Affiliation(s)
- Ewa Janik-Zabrotowicz
- Department of Cell Biology, Institute of Biological Sciences, Maria Curie-Sklodowska University, ul. Akademicka 19, 20-033 Lublin, Poland;
- Correspondence: ; Tel.: +48-81-537-5941; Fax: +48-81-537-5901
| | - Marta Arczewska
- Department of Biophysics, University of Life Sciences in Lublin, Akademicka 13, 20–950 Lublin, Poland; (M.A.); (I.S.)
| | - Monika Zubik
- Department of Biophysics, Institute of Physics, Maria Curie-Sklodowska University, Radziszewskiego 10, 20–031 Lublin, Poland;
| | - Konrad Terpilowski
- Department of Physical Chemistry-Interfacial Phenomena, Maria Curie-Sklodowska University, Pl. Marii Curie-Sklodowskiej 3, 20–031 Lublin, Poland;
| | - Tomasz H. Skrzypek
- Laboratory of Confocal and Electron Microscopy, Department of Biotechnology and Environment Sciences Center for Interdisciplinary Research, John Paul II Catholic University of Lublin, ul. Konstantynów 1J, 20–708 Lublin, Poland;
| | - Izabela Swietlicka
- Department of Biophysics, University of Life Sciences in Lublin, Akademicka 13, 20–950 Lublin, Poland; (M.A.); (I.S.)
| | - Mariusz Gagos
- Department of Cell Biology, Institute of Biological Sciences, Maria Curie-Sklodowska University, ul. Akademicka 19, 20-033 Lublin, Poland;
| |
Collapse
|
9
|
Yasuda M, Oda K, Ueda T, Tabata M. Physico-chemical chlorophyll-a species in aqueous alcohol solutions determine the rate of its discoloration under UV light. Food Chem 2019; 277:463-470. [DOI: 10.1016/j.foodchem.2018.11.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Revised: 10/19/2018] [Accepted: 11/01/2018] [Indexed: 10/28/2022]
|
10
|
Taguchi S, Suga K, Hayashi K, Yoshimoto M, Okamoto Y, Nakamura H, Umakoshi H. Aggregation of chlorophyll a induced in self-assembled membranes composed of DMPC and DHPC. Colloids Surf B Biointerfaces 2019; 175:403-408. [DOI: 10.1016/j.colsurfb.2018.12.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Revised: 10/26/2018] [Accepted: 12/05/2018] [Indexed: 02/07/2023]
|
11
|
Chlorophyll degradation in aqueous mediums induced by light and UV-B irradiation: An UHPLC-ESI-MS study. Radiat Phys Chem Oxf Engl 1993 2017. [DOI: 10.1016/j.radphyschem.2017.05.024] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
12
|
Levenberg A, Shafiei G, Lujan MA, Giannacopoulos S, Picorel R, Zazubovich V. Probing Energy Landscapes of Cytochrome b 6f with Spectral Hole Burning: Effects of Deuterated Solvent and Detergent. J Phys Chem B 2017; 121:9848-9858. [PMID: 28956922 DOI: 10.1021/acs.jpcb.7b07686] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In non-photochemical spectral hole burning (NPHB) and spectral hole recovery experiments, cytochrome b6f protein exhibits behavior that is almost independent of the deuteration of the buffer/glycerol glassy matrix containing the protein, apart from some differences in heat dissipation. On the other hand, strong dependence of the hole burning properties on sample preparation procedures was observed and attributed to a large increase of the electron-phonon coupling and shortening of the excited-state lifetime occurring when n-dodecyl β-d-maltoside (DM) is used as a detergent instead of n-octyl β-d-glucopyranoside (OGP). The data was analyzed assuming that the tunneling parameter distribution or barrier distribution probed by NPHB and encoded into the spectral holes contains contributions from two nonidentical components with accidentally degenerate excited state λ-distributions. Both components likely reflect protein dynamics, although with some small probability one of them (with larger md2) may still represent the dynamics involving specifically the -OH groups of the water/glycerol solvent. Single proton tunneling in the water/glycerol solvent environment or in the protein can be safely excluded as the origin of observed NPHB and hole recovery dynamics. The intensity dependence of the hole growth kinetics in deuterated samples likely reflects differences in heat dissipation between protonated and deuterated samples. These differences are most probably due to the higher interface thermal resistivity between (still protonated) protein and deuterated water/glycerol outside environment.
Collapse
Affiliation(s)
- Alexander Levenberg
- Department of Physics, Concordia University , 7141 Sherbrooke Street West, Montreal, Quebec H4B 1R6, Canada
| | - Golia Shafiei
- Department of Physics, Concordia University , 7141 Sherbrooke Street West, Montreal, Quebec H4B 1R6, Canada
| | - Maria A Lujan
- Estacion Experimental de Aula Dei (CSIC) , Avda. Montañana 1005, 50059 Zaragoza, Spain
| | - Steven Giannacopoulos
- Department of Physics, Concordia University , 7141 Sherbrooke Street West, Montreal, Quebec H4B 1R6, Canada
| | - Rafael Picorel
- Estacion Experimental de Aula Dei (CSIC) , Avda. Montañana 1005, 50059 Zaragoza, Spain
| | - Valter Zazubovich
- Department of Physics, Concordia University , 7141 Sherbrooke Street West, Montreal, Quebec H4B 1R6, Canada
| |
Collapse
|
13
|
Magnesium Trimethoxyphenylporphyrin Chain Controls Energy Dissipation in the presence of Cholesterol. J CHEM SCI 2017. [DOI: 10.1007/s12039-017-1251-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
|
14
|
Komatsu H, Wada K, Kanjoh T, Miyashita H, Sato M, Kawachi M, Kobayashi M. Unique chlorophylls in picoplankton Prochlorococcus sp. "Physicochemical properties of divinyl chlorophylls, and the discovery of monovinyl chlorophyll b as well as divinyl chlorophyll b in the species Prochlorococcus NIES-2086". PHOTOSYNTHESIS RESEARCH 2016; 130:445-467. [PMID: 27334004 DOI: 10.1007/s11120-016-0283-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2015] [Accepted: 06/13/2016] [Indexed: 06/06/2023]
Abstract
In this review, we introduce our recent studies on divinyl chlorophylls functioning in unique marine picoplankton Prochlorococcus sp. (1) Essential physicochemical properties of divinyl chlorophylls are compared with those of monovinyl chlorophylls; separation by normal-phase and reversed-phase high-performance liquid chromatography with isocratic eluent mode, absorption spectra in four organic solvents, fluorescence information (emission spectra, quantum yields, and life time), circular dichroism spectra, mass spectra, nuclear magnetic resonance spectra, and redox potentials. The presence of a mass difference of 278 in the mass spectra between [M+H]+ and the ions indicates the presence of a phytyl tail in all the chlorophylls. (2) Precise high-performance liquid chromatography analyses show divinyl chlorophyll a' and divinyl pheophytin a as the minor key components in four kinds of Prochlorococcus sp.; neither monovinyl chlorophyll a' nor monovinyl pheophytin a is detected, suggesting that the special pair in photosystem I and the primary electron acceptor in photosystem II are not monovinyl but divinyl-type chlorophylls. (3) Only Prochlorococcus sp. NIES-2086 possesses both monovinyl chlorophyll b and divinyl chlorophyll b, while any other monovinyl-type chlorophylls are absent in this strain. Monovinyl chlorophyll b is not detected at all in the other three strains. Prochlorococcus sp. NIES-2086 is the first example that has both monovinyl chlorophyll b as well as divinyl chlorophylls a/b as major chlorophylls.
Collapse
Affiliation(s)
- Hirohisa Komatsu
- Division of Materials Science, Faculty of Pure and Applied Science, University of Tsukuba, Tsukuba, Ibaraki, 305-8573, Japan
| | - Katsuhiro Wada
- Division of Materials Science, Faculty of Pure and Applied Science, University of Tsukuba, Tsukuba, Ibaraki, 305-8573, Japan
| | - Terumitsu Kanjoh
- Division of Materials Science, Faculty of Pure and Applied Science, University of Tsukuba, Tsukuba, Ibaraki, 305-8573, Japan
| | - Hideaki Miyashita
- Graduate School of Human and Environment Studies, Kyoto University, Kyoto, 606-8501, Japan
| | - Mayumi Sato
- National Institute for Environmental Studies, Tsukuba, Ibaraki, 305-8506, Japan
| | - Masanobu Kawachi
- National Institute for Environmental Studies, Tsukuba, Ibaraki, 305-8506, Japan
| | - Masami Kobayashi
- Division of Materials Science, Faculty of Pure and Applied Science, University of Tsukuba, Tsukuba, Ibaraki, 305-8573, Japan.
| |
Collapse
|
15
|
Ben Fredj A. Theoretical Study of the Dimerization of Chlorophyll (a) and Its Hydrates: Implication for Chlorophyll (a) Aggregation. Helv Chim Acta 2016. [DOI: 10.1002/hlca.201500027] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
16
|
Vladkova R. Chlorophyllais the crucial redox sensor and transmembrane signal transmitter in the cytochromeb6fcomplex. Components and mechanisms of state transitions from the hydrophobic mismatch viewpoint. J Biomol Struct Dyn 2015; 34:824-54. [DOI: 10.1080/07391102.2015.1056551] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
17
|
Moca R, Meech SR, Heisler IA. Two-Dimensional Electronic Spectroscopy of Chlorophyll a: Solvent Dependent Spectral Evolution. J Phys Chem B 2015; 119:8623-30. [DOI: 10.1021/acs.jpcb.5b04339] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Roberta Moca
- School of Chemistry, University of East Anglia, Norwich Research
Park, Norwich NR4 7TJ, U.K
| | - Stephen R. Meech
- School of Chemistry, University of East Anglia, Norwich Research
Park, Norwich NR4 7TJ, U.K
| | - Ismael A. Heisler
- School of Chemistry, University of East Anglia, Norwich Research
Park, Norwich NR4 7TJ, U.K
| |
Collapse
|
18
|
Handoko YA, Rondonuwu FS, Limantara L. The Photosensitizer Stabilities of Tookad® on Aggregation, Acidification, and Day-light Irradiation. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.proche.2015.03.064] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
19
|
Correia RF, Viseu MI, Andrade SM. Aggregation/disaggregation of chlorophyll a in model phospholipid-detergent vesicles and micelles. Photochem Photobiol Sci 2014; 13:907-16. [PMID: 24715103 DOI: 10.1039/c3pp50419k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The photosynthetic pigments of higher plants exist in complex oligomeric states, which are difficult to study in vivo. To investigate aggregation processes of chlorophyll a (Chl a), we used an in vitro reconstitution procedure, with this pigment incorporated into liposomes of 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC), micelles and pre-micelle media of the detergent n-dodecyltrimethylammonium chloride (DTAC), and mixed, spontaneous, DMPC-DTAC vesicles and micelles. Chl a oligomers were characterized by UV-visible absorption, steady-state and time-resolved fluorescence, and fluorescence lifetime imaging microscopy. Equivalent diameters of the colloidal structures were obtained by fluorescence correlation spectroscopy. In DMPC liposomes and DMPC-DTAC vesicles and micelles, three fluorescence lifetimes indicated the coexistence of Chl a monomers (≈5 ns) and oligomers (≈1-2 to ≈0.1 ns). The increase in DTAC amount, in the mixed system, induces a progressive solubilization of DMPC liposomes (from vesicles to micelles) and simultaneous disruption of Chl a aggregates; in pure DTAC micelles, mostly monomers were found. The present work aims for a better understanding of chlorophyll-chlorophyll (Chl-Chl), Chl-lipid, and Chl-detergent interactions in spontaneous colloidal micro- and nanostructures.
Collapse
Affiliation(s)
- Raquel F Correia
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal.
| | | | | |
Collapse
|
20
|
Zhang Y, Magdaong N, Frank HA, Rusling JF. Protein film voltammetry and co-factor electron transfer dynamics in spinach photosystem II core complex. PHOTOSYNTHESIS RESEARCH 2014; 120:153-167. [PMID: 23625504 DOI: 10.1007/s11120-013-9831-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2012] [Accepted: 04/15/2013] [Indexed: 06/02/2023]
Abstract
Direct protein film voltammetry (PFV) was used to investigate the redox properties of the photosystem II (PSII) core complex from spinach. The complex was isolated using an improved protocol not used previously for PFV. The PSII core complex had high oxygen-evolving capacity and was incorporated into thin lipid and polyion films. Three well-defined reversible pairs of reduction and oxidation voltammetry peaks were observed at 4 °C in the dark. Results were similar in both types of films, indicating that the environment of the PSII-bound cofactors was not influenced by film type. Based on comparison with various control samples including Mn-depleted PSII, peaks were assigned to chlorophyll a (Chl a) (Em = -0.47 V, all vs. NHE, at pH 6), quinones (-0.12 V), and the manganese (Mn) cluster (Em = 0.18 V). PFV of purified iron heme protein cytochrome b-559 (Cyt b-559), a component of PSII, gave a partly reversible peak pair at 0.004 V that did not have a potential similar to any peaks observed from the intact PSII core complex. The closest peak in PSII to 0.004 V is the 0.18 V peak that was found to be associated with a two-electron process, and thus is inconsistent with iron heme protein voltammetry. The -0.47 V peak had a peak potential and peak potential-pH dependence similar to that found for purified Chl a incorporated into DMPC films. The midpoint potentials reported here may differ to various extents from previously reported redox titration data due to the influence of electrode double-layer effects. Heterogeneous electron transfer (hET) rate constants were estimated by theoretical fitting and digital simulations for the -0.47 and 0.18 V peaks. Data for the Chl a peaks were best fit to a one-electron model, while the peak assigned to the Mn cluster was best fit by a two-electron/one-proton model.
Collapse
Affiliation(s)
- Yun Zhang
- Department of Chemistry, University of Connecticut, Storrs, CT, 06269-3060, USA
| | | | | | | |
Collapse
|
21
|
Sytina OA, Novoderezhkin VI, van Grondelle R, Groot ML. Modeling of multi-exciton transient absorption spectra of protochlorophyllide aggregates in aqueous solution. J Phys Chem A 2011; 115:11944-51. [PMID: 21936513 DOI: 10.1021/jp204395z] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Protochlorophyllide (Pchlide) is a natural porphyrin, a precursor of chlorophyll, synthesized by plants for its photosynthetic apparatus. The pigment spontaneously forms aggregates when dissolved in neat water solution. We present here calculations of the transient absorption spectra and its comprising components (ground-state bleach, stimulated emission, and excited-state absorption) for a strongly excitonically coupled linear chain of four Pchlide chromophores, using exciton theory with phenomenological Gaussian line shapes and without energetic disorder. A refined multiexciton model that includes static disorder is applied to fit the experimental power-dependent transient absorption spectra of aqueous protochlorophyllide and the kinetics for delay times up to 20 ps after photoexcitation. We show that population up to the 4-exciton manifold is sufficient to explain the pronounced saturation of the bleaching and the shape changes in the instantaneous, t = 0.2 ps transient spectra when the pulse energy is increased from 10 to 430 nJ per pulse. The decay of the multiexciton manifold is relatively slow and is preceded by a spectroscopically distinct process. We suggest that the exciton states in the Pchlide aggregates are mixed with charge-transfer states (CTS) and that the population and repopulation of the CTS coupled to the exciton states explains the relatively slow decay of the multiexciton manifold. The relevance of our results to the optical properties and dynamics of natural photosynthetic complexes and the possible physical origin of CTS formation are discussed.
Collapse
Affiliation(s)
- Olga A Sytina
- Department of Physics and Astronomy, Faculty of Sciences, VU University Amsterdam, Amsterdam, The Netherlands.
| | | | | | | |
Collapse
|
22
|
Hasegawa M, Yoshida T, Yabuta M, Terazima M, Kumazaki S. Anti-Stokes Fluorescence Spectra of Chloroplasts in Parachlorella kessleri and Maize at Room Temperature as Characterized by Near-Infrared Continuous-Wave Laser Fluorescence Microscopy and Absorption Microscopy. J Phys Chem B 2011; 115:4184-94. [DOI: 10.1021/jp111306k] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Makoto Hasegawa
- Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
| | - Takahiko Yoshida
- Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
| | - Mitsunori Yabuta
- Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
| | - Masahide Terazima
- Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
| | - Shigeichi Kumazaki
- Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
- PRESTO, Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
| |
Collapse
|
23
|
Myśliwa-Kurdziel B, Kruk J, Strzalka K. Fluorescence Lifetimes and Spectral Properties of Protochlorophyllide in Organic Solvents in Relation to the Respective Parameters In Vivo¶. Photochem Photobiol 2011. [DOI: 10.1111/j.1751-1097.2004.tb09858.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
24
|
Sytina OA, van Stokkum IHM, van Grondelle R, Groot ML. Single and multi-exciton dynamics in aqueous protochlorophyllide aggregates. J Phys Chem A 2010; 115:3936-46. [PMID: 21171640 DOI: 10.1021/jp108317u] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In plants, the oxidoreductase enzyme POR reduces protochlorophyllide (Pchlide) into chlorophyllide (Chlide), using NADPH as a cofactor. The reduction involves the transfer of two electrons and two protons to the C17═C18 double bond of Pchlide, and the reaction is initiated by the absorption of light by Pchlide itself. In this work we have studied the excited state dynamics of Pchlide dissolved in water, where it forms excitonically coupled aggregates, by ultrafast time-resolved transient absorption and fluorescence experiments performed in the 480-720 nm visible region and in the 1780-1590 cm(-1) mid-IR region. The ground state visible absorption spectrum of aqueous Pchlide red shifts and broadens in comparison to the spectrum of monomeric Pchlide in organic solvents. The population of the one-exciton state occurs at low excitation densities, of <1 photon per aggregate. We characterized the multiexciton manifolds spectra by measuring the absorption difference spectra at increasingly higher photon densities. The multiexciton states are characterized by blue-shifted stimulated emission and red-shifted excited state absorption in comparison to those of the one-exciton manifold. The relaxation dynamics of the multiexciton manifolds into the one-exciton manifold is found to occur in ∼10 ps. This surprisingly slow rate we suggest is due to the intrinsic charge transfer character of the PChlide excited state that leads to solvation, stabilizing the CT state, and subsequent charge recombination, which limits the exciton relaxation.
Collapse
Affiliation(s)
- Olga A Sytina
- Department of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | | | | | | |
Collapse
|
25
|
Sytina OA, van Stokkum IHM, Heyes DJ, Hunter CN, van Grondelle R, Groot ML. Protochlorophyllide excited-state dynamics in organic solvents studied by time-resolved visible and mid-infrared spectroscopy. J Phys Chem B 2010; 114:4335-44. [PMID: 20205376 DOI: 10.1021/jp9089326] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Protochlorophyllide (PChlide) is a precursor in the biosynthesis of chlorophyll. Complexed with NADPH to the enzyme protochlorophyllide oxidoreductase (POR), it is reduced to chlorophyllide, a process that occurs via a set of spectroscopically distinct intermediate states and is initiated from the excited state of PChlide. To obtain a better understanding of these catalytic events, we characterized the excited state dynamics of PChlide in the solvents tetrahydrofuran (THF), methanol, and Tris/Triton buffer using ultrafast transient absorption in the visible and mid-infrared spectral regions and time-resolved fluorescence emission experiments. For comparison, we present time-resolved transient absorption measurements of chlorophyll a in THF. From the combined analysis of these experiments, we derive that during the 2-3 ns excited state lifetime an extensive multiphasic quenching of the emission occurs due to solvation of the excited state, which is in agreement with the previously proposed internal charge transfer (ICT) character of the S1 state ( Zhao , G. J. ; Han , K. L. Biophys. J. 2008 , 94 , 38 ). The solvation process in methanol occurs in conjunction with a strengthening of a hydrogen bond to the Pchlide keto carbonyl group. We demonstrate that the internal conversion from the S2 to S1 excited states is remarkably slow and stretches out on to the 700 fs time scale, causing a rise of blue-shifted signals in the transient absorption and a gain of emission in the time-resolved fluorescence. A triplet state is populated on the nanosecond time scale with a maximal yield of approximately 23%. The consequences of these observations for the catalytic pathway and the role of the triplet and ICT state in activation of the enzyme are discussed.
Collapse
Affiliation(s)
- Olga A Sytina
- Department of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands.
| | | | | | | | | | | |
Collapse
|
26
|
Fredj AB, Ruiz-López MF. Theoretical Study of Chlorophyll a Hydrates Formation in Aqueous Organic Solvents. J Phys Chem B 2009; 114:681-7. [DOI: 10.1021/jp909380t] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Arij Ben Fredj
- Equipe de Chimie et Biochimie Théoriques, SRSMC, Nancy-University, BP 70239, 54506 Vandoeuvre-lès-Nancy, France, and Laboratoire de Spectroscopie Atomique, Moléculaire et Applications, Faculté des Sciences de Tunis, 1060 Tunis, Tunisia
| | - Manuel F. Ruiz-López
- Equipe de Chimie et Biochimie Théoriques, SRSMC, Nancy-University, BP 70239, 54506 Vandoeuvre-lès-Nancy, France, and Laboratoire de Spectroscopie Atomique, Moléculaire et Applications, Faculté des Sciences de Tunis, 1060 Tunis, Tunisia
| |
Collapse
|
27
|
|
28
|
Komura M, Itoh S. Fluorescence measurement by a streak camera in a single-photon-counting mode. PHOTOSYNTHESIS RESEARCH 2009; 101:119-133. [PMID: 19568951 DOI: 10.1007/s11120-009-9463-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2009] [Accepted: 06/15/2009] [Indexed: 05/28/2023]
Abstract
We describe here a recently developed fluorescence measurement system that uses a streak camera to detect fluorescence decay in a single photon-counting mode. This system allows for easy measurements of various samples and provides 2D images of fluorescence in the wavelength and time domains. The great advantage of the system is that the data can be handled with ease; furthermore, the data are amenable to detailed analysis. We describe the picosecond kinetics of fluorescence in spinach Photosystem (PS) II particles at 4-77 K as a typical experimental example. Through the global analysis of the data, we have identified a new fluorescence band (F689) in addition to the already established F680, F685, and F695 emission bands. The blue shift of the steady-state fluorescence spectrum upon cooling below 77 K can be interpreted as an increase of the shorter-wavelength fluorescence, especially F689, due to the slowdown of the excitation energy transfer process. The F685 and F695 bands seem to be thermally equilibrated at 77 K but not at 4 K. The simple and efficient photon accumulation feature of the system allows us to measure fluorescence from leaves, solutions, single colonies, and even single cells. The 2D fluorescence images obtained by this system are presented for isolated spinach PS II particles, intact leaves of Arabidopsis thaliana, the PS I super-complex of a marine centric diatom, Chaetoceros gracilis, isolated membranes of a purple photosynthetic bacterium, Acidiphilium rubrum, which contains Zn-BChl a, and a coral that contains a green fluorescent protein and an algal endosymbiont, Zooxanthella.
Collapse
Affiliation(s)
- Masayuki Komura
- Division of Material Science (Physics), Graduate School of Science, Nagoya University, Furocho, Chikusa, Nagoya, Japan
| | | |
Collapse
|
29
|
Ben Fredj A, Ben Lakhdar Z, Ruiz-López M. Six-coordination in Chlorophylls: The fundamental role of dispersion energy. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.03.025] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
30
|
Fredj AB, Lakhdar ZB, Ruiz-López MF. The structure of chlorophyll a–water complexes: insights from quantum chemistry calculations. Chem Commun (Camb) 2008:718-20. [DOI: 10.1039/b716800d] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
31
|
Zhao GJ, Han KL. Site-specific solvation of the photoexcited protochlorophyllide a in methanol: formation of the hydrogen-bonded intermediate state induced by hydrogen-bond strengthening. Biophys J 2007; 94:38-46. [PMID: 17827245 PMCID: PMC2134880 DOI: 10.1529/biophysj.107.113738] [Citation(s) in RCA: 371] [Impact Index Per Article: 21.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The site-specific solvation of the photoexcited protochlorophyllide a (Pchlide a) in methanol solvent was investigated using the time-dependent density functional theory method for the first time to our knowledge. The intermolecular site-specific coordination and hydrogen-bonding interactions between Pchlide a and methanol molecules play a very important role in the steady-state and time-resolved spectra. All the calculated absorption and fluorescence spectra of the isolated Pchlide a and its coordinated and hydrogen-bonded complexes with methanol demonstrate that the novel fluorescence shoulder at approximately 690 nm of Pchlide a in methanol should be ascribed to the coordinated and hydrogen-bonded Pchlide a-(MeOH)(4) complex. This coordinated and hydrogen-bonded complex can also account for the intermediate state found in the time-resolved spectroscopic studies. Herein, we have theoretically confirmed that the intermolecular coordination and hydrogen bonds between Pchlide a and methanol molecules can be strengthened in the electronically excited state of Pchlide a. Furthermore, the site-specific solvation of the photoexcited Pchlide a can be induced by the intermolecular coordination and hydrogen-bond strengthening upon photoexcitation. Then the hydrogen-bonded intermediate state is formed in 22-27 ps timescales after the site-specific solvation. All the steady-state and time-resolved spectral features of Pchlide a in different solvents can be explained by the formation of this hydrogen-bonded intermediate state after the site-specific solvation, which is induced by the coordination and hydrogen-bond strengthening.
Collapse
Affiliation(s)
- Guang-Jiu Zhao
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China.
| | | |
Collapse
|
32
|
Komura M, Shibata Y, Itoh S. A new fluorescence band F689 in photosystem II revealed by picosecond analysis at 4–77 K: Function of two terminal energy sinks F689 and F695 in PS II. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2006; 1757:1657-68. [PMID: 17070496 DOI: 10.1016/j.bbabio.2006.09.007] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2006] [Revised: 09/22/2006] [Accepted: 09/26/2006] [Indexed: 11/29/2022]
Abstract
We performed picosecond time-resolved fluorescence spectroscopy in spinach photosystem II (PS II) particles at 4, 40, and 77 K and identified a new fluorescence band, F689. F689 was identified in addition to the well-known F685 and F695 bands in both analyses of decay-associated spectra and global Gaussian deconvolution of time-resolved spectra. Its fast decay suggests the energy transfer directly from F689 to the reaction center chlorophyll P680. The contribution of F689, which increases only at low temperature, explains the unusually broad and variable bandwidth of F695 at low temperature. Global analysis revealed the three types of excitation energy transfer/dissipation processes: (1) energy transfer from the peripheral antenna to the three core antenna bands F685, F689, and F695 with time constants of 29 and 171 ps at 77 and 4 K, respectively; (2) between the three core bands (0.18 and 0.82 ns); and (3) the decays of F689 (0.69 and 3.02 ns) and F695 (2.18 and 4.37 ns). The retardations of these energy transfer rates and the slow F689 decay rate produced the strong blue shift of the PS II fluorescence upon the cooling below 77 K.
Collapse
Affiliation(s)
- Masayuki Komura
- Division of Material Science (Physics), Graduate School of Science, Nagoya University, Furocho, Chikusa, Nagoya 464-8602, Japan
| | | | | |
Collapse
|
33
|
Sun W, Wang H, Xie C, Hu Y, Yang X, Xu H. An attempt to directly trace polymeric nanoparticles in vivo with electron microscopy. J Control Release 2006; 115:259-65. [PMID: 17010467 DOI: 10.1016/j.jconrel.2006.08.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2006] [Revised: 07/29/2006] [Accepted: 08/11/2006] [Indexed: 10/24/2022]
Abstract
This work attempted to directly observe polymeric nanoparticles in vivo by analytical electron microscopy (AEM) using copper chlorophyll as the contrast agent, based on the experiments concerned with the copper chlorophyll labeled poly-DL-lactide nanoparticles and the in vivo distribution of the polysorbate 80 (T-80)-coated nanoparticles in brain tissues. With the nanoprecipitation method without surfactants, copper chlorophyll is aggregated in the coordinately saturated form and encapsulated by the matrices of nanoparticles, which may ensure the stability of copper chlorophyll during the in vivo experiments. From both morphological information and chemical information, only the labeled nanoparticles with the T-80 coating were directly traced in the brain by AEM. The results not only support the mechanism of endocytosis and/or transcytosis of T-80-coated nanoparticles targeted to the brain but also verify that it is practical to probe polymeric nanoparticles in vivo using AEM together with copper chlorophyll as the contrast agent.
Collapse
Affiliation(s)
- Wangqiang Sun
- Nano Pharmaceutical Research Center, Huazhong University of Science and Technology, 1037 Luo-Yu Road, Wuhan, Hubei 430074, China.
| | | | | | | | | | | |
Collapse
|
34
|
Sun W, Xie C, Wang H, Hu Y, Yang X, Xu H. Labeling Polymeric Nanoparticles with Copper Chlorophyll as Contrast Agent for Electron Microscopy. CHEM LETT 2006. [DOI: 10.1246/cl.2006.378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
35
|
Mennenga A, Gärtner W, Lubitz W, Görner H. Effects of noncovalently bound quinones on the ground and triplet states of zinc chlorins in solution and bound to de novo synthesized peptides. Phys Chem Chem Phys 2006; 8:5444-53. [PMID: 17119653 DOI: 10.1039/b612056c] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Qy absorption band of two chlorophyll derivatives, zinc chlorin e6 (ZnCe6) and zinc pheophorbide a (ZnPheida), in aqueous solution is bathochromically shifted on addition of quinones, e.g., 1,4-benzoquinone (BQ), with a corresponding shift of the fluorescence band. This is due to a complex formation of zinc chlorins induced by BQs and subsequent rearrangement. The time-resolved absorption spectra after laser pulse excitation show triplet quenching of the pigments by BQ and other quinones via electron transfer. The effects of electron transfer to noncovalently bound BQs were also studied with de novo synthesized peptides, into which ZnCe6 and ZnPheida were incorporated as model systems for the primary steps of photosynthetic reaction centers. Whereas the photophysical properties are similar to those of the unbound zinc chlorins, no BQ-mediated complex formation was observed.
Collapse
Affiliation(s)
- Anke Mennenga
- Max-Planck-Institut für Bioanorganische Chemie, D-45413, Mülheim an der Ruhr, Germany
| | | | | | | |
Collapse
|
36
|
Linnanto J, Korppi-Tommola J. Quantum chemical simulation of excited states of chlorophylls, bacteriochlorophylls and their complexes. Phys Chem Chem Phys 2005; 8:663-87. [PMID: 16482307 DOI: 10.1039/b513086g] [Citation(s) in RCA: 114] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The present review describes the use of quantum chemical methods in estimation of structures and electronic transition energies of photosynthetic pigments in vacuum, in solution and imbedded in proteins. Monomeric Mg-porphyrins, chlorophylls and bacteriochlorophylls and their solvent 1:1 and 1:2 complexes were studied. Calculations were performed for Mg-porphyrin, Mg-chlorin, Mg-bacteriochlorin, mesochlorophyll a, chlorophylls a, b, c(1), c(2), c(3), d and bacteriochlorophylls a, b, c, d, e, f, g, h, plus several homologues. Geometries were optimised with PM3, PM3/CISD, PM5, ab initio HF (6-31G*/6-311G**) and density functional B3LYP (6-31G*/6-311G**) methods. Spectroscopic transition energies were calculated with ZINDO/S CIS, PM3 CIS, PM3 CISD, ab initio CIS, time-dependent HF and time-dependent B3LYP methods. Estimates for experimental transition energies were obtained from linear correlations of the calculated transition energies of 1:1 solvent complexes against experimentally recorded solution energies (scaling). According to the calculations in five-coordinated solvent complexes the magnesium atom lies out of the porphyrin plane, while in six-coordinated complexes the porphyrin is nearly planar. Charge densities on magnesium and nitrogen atoms were strongly dependent on the computational method deployed. Several dark states of low oscillator strength below the main Soret band were predicted for solvent complexes and chlorophylls and bacteriochlorophylls in protein environment. Such states, though not yet identified experimentally, might serve as intermediate states for excitation energy transfer in photosynthetic complexes. Q(y), Q(x) and Soret transition energies were found to depend on the orientation of the acetyl group and external pressure. A method to estimate site energies and dimeric interaction energies and to simulate absorption and CD spectra of photosynthetic complexes is described. Simulations for the light harvesting complexes Rhodospirillum molischianum, chlorosomes of Chlorobium tepidum and Chloroflexus aurantiacus, and LHC-II of Spinacia oleracea are presented as examples.
Collapse
Affiliation(s)
- Juha Linnanto
- Physical Chemistry Laboratory, University of Jyväskylä, P.O. Box 35, FIN-40014, Finland.
| | | |
Collapse
|
37
|
Ihalainen JA, D'Haene S, Yeremenko N, van Roon H, Arteni AA, Boekema EJ, van Grondelle R, Matthijs HCP, Dekker JP. Aggregates of the chlorophyll-binding protein IsiA (CP43') dissipate energy in cyanobacteria. Biochemistry 2005; 44:10846-53. [PMID: 16086587 DOI: 10.1021/bi0510680] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In many natural habitats, growth of cyanobacteria may be limited by a low concentration of iron. Cyanobacteria respond to this condition by expressing a number of iron-stress-inducible genes, of which the isiA gene encodes a chlorophyll-binding protein known as IsiA or CP43'. IsiA monomers assemble into ring-shaped polymers that encircle trimeric or monomeric photosystem I (PSI), or are present in supercomplexes without PSI, in particular upon prolonged iron starvation. In this report, we present steady-state and time-resolved fluorescence measurements of isolated IsiA aggregates that have been purified from an iron-starved psaFJ-minus mutant of Synechocystis PCC 6803. We show that these aggregates have a fluorescence quantum yield of approximately 2% compared to that of chlorophyll a in acetone, and that the dominating fluorescence lifetimes are 66 and 210 ps, more than 1 order of magnitude shorter than that of free chlorophyll a. Comparison of the temperature dependence of the fluorescence yields and spectra of the isolated aggregates and of the cells from which they were obtained suggests that these aggregates occur naturally in the iron-starved cells. We suggest that IsiA aggregates protect cyanobacterial cells against the deleterious effects of light.
Collapse
Affiliation(s)
- Janne A Ihalainen
- Division of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | | | | | | | | | | | | | | | | |
Collapse
|
38
|
Dashdorj N, Zhang H, Kim H, Yan J, Cramer WA, Savikhin S. The single chlorophyll a molecule in the cytochrome b6f complex: unusual optical properties protect the complex against singlet oxygen. Biophys J 2005; 88:4178-87. [PMID: 15778449 PMCID: PMC1305648 DOI: 10.1529/biophysj.104.058693] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2004] [Accepted: 03/16/2005] [Indexed: 11/18/2022] Open
Abstract
The cytochrome b(6)f complex of oxygenic photosynthesis mediates electron transfer between the reaction centers of photosystems I and II and facilitates coupled proton translocation across the membrane. High-resolution x-ray crystallographic structures (Kurisu et al., 2003; Stroebel et al., 2003) of the cytochrome b(6)f complex unambiguously show that a Chl a molecule is an intrinsic component of the cytochrome b(6)f complex. Although the functional role of this Chl a is presently unclear (Kuhlbrandt, 2003), an excited Chl a molecule is known to produce toxic singlet oxygen as the result of energy transfer from the excited triplet state of the Chl a to oxygen molecules. To prevent singlet oxygen formation in light-harvesting complexes, a carotenoid is typically positioned within approximately 4 A of the Chl a molecule, effectively quenching the triplet excited state of the Chl a. However, in the cytochrome b(6)f complex, the beta-carotene is too far (> or =14 Angstroms) from the Chl a for effective quenching of the Chl a triplet excited state. In this study, we propose that in this complex, the protection is at least partly realized through special arrangement of the local protein structure, which shortens the singlet excited state lifetime of the Chl a by a factor of 20-25 and thus significantly reduces the formation of the Chl a triplet state. Based on optical ultrafast absorption difference experiments and structure-based calculations, it is proposed that the Chl a singlet excited state lifetime is shortened due to electron exchange transfer with the nearby tyrosine residue. To our knowledge, this kind of protection mechanism against singlet oxygen has not yet been reported for any other chlorophyll-containing protein complex. It is also reported that the Chl a molecule in the cytochrome b(6)f complex does not change orientation in its excited state.
Collapse
|
39
|
Simplicio FI, Ribeiro da Silva Soares R, Maionchi F, Santin Filho O, Hioka N. Aggregation of a Benzoporphyrin Derivative in Water/Organic Solvent Mixtures: A Mechanistic Proposition. J Phys Chem A 2004. [DOI: 10.1021/jp048542g] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fernanda Ibanez Simplicio
- Departamento de Química, Universidade Estadual de Maringá, Avenida Colombo, 5790, 87020-900 Maringá, Paraná, Brazil
| | | | - Florângela Maionchi
- Departamento de Química, Universidade Estadual de Maringá, Avenida Colombo, 5790, 87020-900 Maringá, Paraná, Brazil
| | - Ourides Santin Filho
- Departamento de Química, Universidade Estadual de Maringá, Avenida Colombo, 5790, 87020-900 Maringá, Paraná, Brazil
| | - Noboru Hioka
- Departamento de Química, Universidade Estadual de Maringá, Avenida Colombo, 5790, 87020-900 Maringá, Paraná, Brazil
| |
Collapse
|
40
|
Linnanto J, Korppi-Tommola J. Structural and Spectroscopic Properties of Mg−Bacteriochlorin and Methyl Bacteriochlorophyllides a, b, g, and h Studied by Semiempirical, ab Initio, and Density Functional Molecular Orbital Methods. J Phys Chem A 2004. [DOI: 10.1021/jp0309771] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Juha Linnanto
- Department of Chemistry, University of Jyväskylä, P.O. Box 35, FIN-40014 Finland
| | - Jouko Korppi-Tommola
- Department of Chemistry, University of Jyväskylä, P.O. Box 35, FIN-40014 Finland
| |
Collapse
|
41
|
Cosma P, Longobardi F, Agostiano A. Electrochemical characterization of species involved in photosynthesis: from proteins to model systems. J Electroanal Chem (Lausanne) 2004. [DOI: 10.1016/j.jelechem.2003.11.042] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
42
|
Myśliwa-Kurdziel B, Kruk J, Strzałka K. Fluorescence Lifetimes and Spectral Properties of Protochlorophyllide in Organic Solvents in Relation to the Respective Parameters In Vivo¶. Photochem Photobiol 2004. [DOI: 10.1562/0031-8655(2004)79<62:flaspo>2.0.co;2] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
43
|
Chibisov AK, Slavnova TD, Görner H. Effect of macromolecules and triton X-100 on the triplet of aggregated chlorophyll in aqueous solution. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2003; 72:11-6. [PMID: 14644561 DOI: 10.1016/j.jphotobiol.2003.08.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Chlorophyll a (Chla) in aqueous solution (2-6% acetone) is present as mono- and dihydrated aggregated forms which are characterized by specific ground state absorption spectra. The amount of dihydrated form is larger in the presence of macromolecules, such as bovine serum albumin (BSA), lysozime and polyvinyl alcohol (PVA), increasing from BSA to lysozime and PVA. Chla in aqueous acetone with and without macromolecules is characterized by low fluorescence and the absence of triplet-triplet (T-T) absorption. The ratio of dihydrated to monohydrated forms is significantly influenced by triton X-100. For lower triton X-100 concentrations, i.e. smaller than the critical micelle concentration of 0.26 mM (cmc), dihydrated forms are converted into monohydrated in both aqueous acetone and the presence of BSA or lysozime. In the presence of PVA dihydrated forms appeared to be resistant to triton X-100 action. Moreover, for triton X-100 concentrations of 2-3 times higher than cmc the amount of these forms is increased with time. T-T absorption of both mono- and dihydrated Chla aggregates was not detected in the presence of [triton X-100] < cmc. The lack of T-T absorption in aqueous acetone solution as well as in the presence of macromolecules implies that the triplet lifetime of the chlorophyll aggregates is short (tauT<10 ns) and/or the quantum yield of intersystem crossing is small (<5 x 10(-3)). The Chla monomers start to be formed as solubilized in the micelle for [triton X-100] larger than cmc, showing substantial fluorescence and T-T absorption.
Collapse
Affiliation(s)
- A K Chibisov
- Max-Planck-Institut für Bioanorganische Chemie, Mülheim an der Ruhr D-45413, Germany
| | | | | |
Collapse
|
44
|
Linnanto J, Korppi-Tommola J. Semiempirical PM5 molecular orbital study on chlorophylls and bacteriochlorophylls: Comparison of semiempirical,ab initio, and density functional results. J Comput Chem 2003; 25:123-38. [PMID: 14635000 DOI: 10.1002/jcc.10344] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The semiempirical PM5 method has been used to calculate fully optimized structures of magnesium-bacteriochlorin, magnesium-chlorin, magnesium-porphin, mesochlorophyll a, chlorophylls a, b, c(1), c(2), c(3), and d, and bacteriochlorophylls a, b, c, d, e, f, g, and h with all homologous structures. Hartree-Fock/6-31G* ab initio and density functional B3LYP/6-31G* methods were used to optimize structures of methyl chlorophyllide a, chlorophyll c(1), and methyl bacteriochlorophyllides a and c for comparison. Spectroscopic transition energies of the chromophores and their 1:1 or 1:2 solvent complexes were calculated with the Zindo/S CIS method. The self-consistent reaction field model was used to estimate solvent shifts. The PM5 calculations predict planar structure of the porphyrin ring and central position of the four coordinated magnesium atoms in all pigments studied, in accord with the experimental, ab initio, and density functional results, a significant improvement as compared to the older semiempirical PM3 approach. Only small differences in PM5 and B3LYP/6-31G* or Hartree-Fock/6-31G* minimum energy geometries of the reference molecules were observed. Calculations show that in 1:1 solvent complexes, where the magnesium atom is five coordinated, the magnesium atom is shifted out of the plane of the porphyrin ring towards the solvent molecule, while the hexa coordinated 1:2 complexes are again planar. The PM5 method gives atomic charges that are comparable with those obtained from the Hartree-Fock/6-31G* and B3LYP/6-31G* calculations. The single point ZINDO/S CIS calculations with PM5 minimum energy structure gave excellent correlations between calculated and experimental transition energies of the chlorophylls and bacteriochlorophylls studied. Such correlations may be used for prediction of transition energies of the chromophores in protein binding sites. Calculations also predict existence of dark electronic states below the main Soret absorption band in all chromophores studied. The results suggest that the semiempirical PM5 method is a fairly reliable and computationally efficient method in predicting molecular parameters of porphyrin-like molecules.
Collapse
Affiliation(s)
- Juha Linnanto
- Department of Chemistry, P.O. Box 35, FIN-40014 University of Jyväskylä, Finland
| | | |
Collapse
|
45
|
Agostiano A, Cosma P, Trotta M, Monsù-Scolaro L, Micali N. Chlorophyll a Behavior in Aqueous Solvents: Formation of Nanoscale Self-Assembled Complexes. J Phys Chem B 2002. [DOI: 10.1021/jp026385k] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Angela Agostiano
- Dipartimento di Chimica, Università di Bari and Istituto per i Processi Chimico-Fisici−IPCF-CNR Bari, Via Orabona, 4-70126 Bari, Italy, Dipartimento di Chimica Inorganica, Chimica Analitica e Chimica Fisica and ISMN-CNR, Sezione di Messina and INFM, Unità di Messina, Salita Sperone, 31-98166 Vill. S. Agata, Messina Italy, and Istituto per i Processi Chimico-Fisici, IPCF-CNR Messina, Via La Farina, 237-98123 Messina, Italy
| | - Pinalysa Cosma
- Dipartimento di Chimica, Università di Bari and Istituto per i Processi Chimico-Fisici−IPCF-CNR Bari, Via Orabona, 4-70126 Bari, Italy, Dipartimento di Chimica Inorganica, Chimica Analitica e Chimica Fisica and ISMN-CNR, Sezione di Messina and INFM, Unità di Messina, Salita Sperone, 31-98166 Vill. S. Agata, Messina Italy, and Istituto per i Processi Chimico-Fisici, IPCF-CNR Messina, Via La Farina, 237-98123 Messina, Italy
| | - Massimo Trotta
- Dipartimento di Chimica, Università di Bari and Istituto per i Processi Chimico-Fisici−IPCF-CNR Bari, Via Orabona, 4-70126 Bari, Italy, Dipartimento di Chimica Inorganica, Chimica Analitica e Chimica Fisica and ISMN-CNR, Sezione di Messina and INFM, Unità di Messina, Salita Sperone, 31-98166 Vill. S. Agata, Messina Italy, and Istituto per i Processi Chimico-Fisici, IPCF-CNR Messina, Via La Farina, 237-98123 Messina, Italy
| | - Luigi Monsù-Scolaro
- Dipartimento di Chimica, Università di Bari and Istituto per i Processi Chimico-Fisici−IPCF-CNR Bari, Via Orabona, 4-70126 Bari, Italy, Dipartimento di Chimica Inorganica, Chimica Analitica e Chimica Fisica and ISMN-CNR, Sezione di Messina and INFM, Unità di Messina, Salita Sperone, 31-98166 Vill. S. Agata, Messina Italy, and Istituto per i Processi Chimico-Fisici, IPCF-CNR Messina, Via La Farina, 237-98123 Messina, Italy
| | - Norberto Micali
- Dipartimento di Chimica, Università di Bari and Istituto per i Processi Chimico-Fisici−IPCF-CNR Bari, Via Orabona, 4-70126 Bari, Italy, Dipartimento di Chimica Inorganica, Chimica Analitica e Chimica Fisica and ISMN-CNR, Sezione di Messina and INFM, Unità di Messina, Salita Sperone, 31-98166 Vill. S. Agata, Messina Italy, and Istituto per i Processi Chimico-Fisici, IPCF-CNR Messina, Via La Farina, 237-98123 Messina, Italy
| |
Collapse
|
46
|
Palacios MA, de Weerd FL, Ihalainen JA, van Grondelle R, van Amerongen H. Superradiance and Exciton (De)localization in Light-Harvesting Complex II from Green Plants? J Phys Chem B 2002. [DOI: 10.1021/jp014078t] [Citation(s) in RCA: 90] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Miguel A. Palacios
- Faculty of Sciences, Division of Physics and Astronomy, Department of Biophysics and Physics of Complex Systems, Vrije Universiteit, De Boelelaan, 1081, 1081 HV Amsterdam, The Netherlands, and Department of Chemistry, University of Jyväskylä, P.O. Box 35, FIN-40351 Jyväskylä, Finland
| | - Frank L. de Weerd
- Faculty of Sciences, Division of Physics and Astronomy, Department of Biophysics and Physics of Complex Systems, Vrije Universiteit, De Boelelaan, 1081, 1081 HV Amsterdam, The Netherlands, and Department of Chemistry, University of Jyväskylä, P.O. Box 35, FIN-40351 Jyväskylä, Finland
| | - Janne A. Ihalainen
- Faculty of Sciences, Division of Physics and Astronomy, Department of Biophysics and Physics of Complex Systems, Vrije Universiteit, De Boelelaan, 1081, 1081 HV Amsterdam, The Netherlands, and Department of Chemistry, University of Jyväskylä, P.O. Box 35, FIN-40351 Jyväskylä, Finland
| | - Rienk van Grondelle
- Faculty of Sciences, Division of Physics and Astronomy, Department of Biophysics and Physics of Complex Systems, Vrije Universiteit, De Boelelaan, 1081, 1081 HV Amsterdam, The Netherlands, and Department of Chemistry, University of Jyväskylä, P.O. Box 35, FIN-40351 Jyväskylä, Finland
| | - Herbert van Amerongen
- Faculty of Sciences, Division of Physics and Astronomy, Department of Biophysics and Physics of Complex Systems, Vrije Universiteit, De Boelelaan, 1081, 1081 HV Amsterdam, The Netherlands, and Department of Chemistry, University of Jyväskylä, P.O. Box 35, FIN-40351 Jyväskylä, Finland
| |
Collapse
|
47
|
Agostiano A, Catucci L, Colafemmina G, Scheer H. Role of Functional Groups and Surfactant Charge in Regulating Chlorophyll Aggregation in Micellar Solutions. J Phys Chem B 2002. [DOI: 10.1021/jp011718j] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Angela Agostiano
- Dipartimento di Chimica, Università degli Studi di Bari, via Orabona 4, 70126 Bari, Italy, CNR Centro Studi Chimico Fisici Sulla Interazione Luce-Materia, and Botanisches Institut der Universität, Menzinger Str. 67, 80638 München, Germany
| | - Lucia Catucci
- Dipartimento di Chimica, Università degli Studi di Bari, via Orabona 4, 70126 Bari, Italy, CNR Centro Studi Chimico Fisici Sulla Interazione Luce-Materia, and Botanisches Institut der Universität, Menzinger Str. 67, 80638 München, Germany
| | - Giuseppe Colafemmina
- Dipartimento di Chimica, Università degli Studi di Bari, via Orabona 4, 70126 Bari, Italy, CNR Centro Studi Chimico Fisici Sulla Interazione Luce-Materia, and Botanisches Institut der Universität, Menzinger Str. 67, 80638 München, Germany
| | - Hugo Scheer
- Dipartimento di Chimica, Università degli Studi di Bari, via Orabona 4, 70126 Bari, Italy, CNR Centro Studi Chimico Fisici Sulla Interazione Luce-Materia, and Botanisches Institut der Universität, Menzinger Str. 67, 80638 München, Germany
| |
Collapse
|
48
|
Jones G, Vullev VI. Ground- and Excited-State Aggregation Properties of a Pyrene Derivative in Aqueous Media. J Phys Chem A 2001. [DOI: 10.1021/jp010087q] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Guilford Jones
- Department of Chemistry and Photonics Center, Boston University, Boston, Massachusetts 02215
| | - Valentine I. Vullev
- Department of Chemistry and Photonics Center, Boston University, Boston, Massachusetts 02215
| |
Collapse
|