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Ayub MA, Zia Ur Rehman M, Ahmad HR, Fox JP, Clubb P, Wright AL, Anwar-Ul-Haq M, Nadeem M, Rico CM, Rossi L. Influence of ionic cerium and cerium oxide nanoparticles on Zea mays seedlings grown with and without cadmium. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 322:121137. [PMID: 36720342 DOI: 10.1016/j.envpol.2023.121137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 01/16/2023] [Accepted: 01/21/2023] [Indexed: 06/18/2023]
Abstract
Cerium (Ce4+) and cerium oxide nanoparticles (CeO2-NPs) have diversified reported effects on plants. Once dispersed in the environment their fate is not well understood, especially in co-existence with other pollutants like cadmium (Cd). The effect of co-application of Ce and Cd are reported in various studies, but the role of Ce source (ionic or bulk) and nanoparticle size is still unknown in cereal plants like maize (Zea mays). To better understand the synergistic effects of Ce and Cd, 500 mg kg-1 Ce coming from ionic (Ce4+ as CeSO4) and CeO2 nano sources (10 nm, 50 nm, and 100 nm) alone and in combination with 0.5 mg Cd kg-1 sand were applied to maize seedlings. Growth, physiology, root structure, anatomy, and ionic homeostasis in maize were measured. The results revealed that Ce4+ resulted in overall decrease in seedling growth, biomass and resulted in higher heavy metal (in control sets) and Cd (in Cd spiked sets) uptake in maize seedlings' root and shoot. The effects of CeO2-NPs were found to be dependent on particle size; in fact, under Cd-0 (non-Cd spiked sets) CeO2-100 nm showed beneficial effects compared to the control. While under co-application with Cd, CeO2-50 nm showed net beneficial effects on maize seedling growth parameters. The Ce alone, and in combination with Cd, altered the root suberin barrier formation. Both ionic and nano Ce sources alone and in co-existence with Cd behaved differently for tissue elemental concentrations (Ce, Cd, micronutrients like B, Mn, Ni, Cu, Zn, Mo, Fe and elements Co, Si) suggesting a strong influence of Cd-Ce coexistence on the element's uptake and translocation in maize.
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Affiliation(s)
- Muhammad Ashar Ayub
- Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, 38000, Faisalabad, Punjab, Pakistan; Indian River Research and Education Center, Horticultural Sciences Department, Institute of Food and Agricultural Sciences, University of Florida, Fort Pierce, Florida, 34945, USA; Institute of Agro-Industry and Environment, Faculty of Agriculture and Environment, The Islamia University of Bahawalpur, 63100, Punjab, Pakistan
| | - Muhammad Zia Ur Rehman
- Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, 38000, Faisalabad, Punjab, Pakistan
| | - Hamaad Raza Ahmad
- Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, 38000, Faisalabad, Punjab, Pakistan
| | - John-Paul Fox
- Indian River Research and Education Center, Horticultural Sciences Department, Institute of Food and Agricultural Sciences, University of Florida, Fort Pierce, Florida, 34945, USA
| | - Preston Clubb
- Department of Chemistry and Biochemistry, Missouri State University, 901 S National Ave, Springfield, MO, 65897, USA
| | - Alan L Wright
- Indian River Research and Education Center, Soil, Water, and Ecosystem Sciences Department, Institute of Food and Agricultural Sciences, University of Florida, Fort Pierce, Florida, 34945, USA
| | - Muhammad Anwar-Ul-Haq
- Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, 38000, Faisalabad, Punjab, Pakistan
| | - Muhammad Nadeem
- Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, 38000, Faisalabad, Punjab, Pakistan; Indian River Research and Education Center, Soil, Water, and Ecosystem Sciences Department, Institute of Food and Agricultural Sciences, University of Florida, Fort Pierce, Florida, 34945, USA; Institute of Agro-Industry and Environment, Faculty of Agriculture and Environment, The Islamia University of Bahawalpur, 63100, Punjab, Pakistan
| | - Cyren M Rico
- Department of Chemistry and Biochemistry, Missouri State University, 901 S National Ave, Springfield, MO, 65897, USA
| | - Lorenzo Rossi
- Indian River Research and Education Center, Horticultural Sciences Department, Institute of Food and Agricultural Sciences, University of Florida, Fort Pierce, Florida, 34945, USA.
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Photodynamic Therapy of Aluminum Phthalocyanine Tetra Sodium 2-Mercaptoacetate Linked to PEGylated Copper-Gold Bimetallic Nanoparticles on Colon Cancer Cells. Int J Mol Sci 2023; 24:ijms24031902. [PMID: 36768224 PMCID: PMC9915188 DOI: 10.3390/ijms24031902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 01/10/2023] [Accepted: 01/12/2023] [Indexed: 01/21/2023] Open
Abstract
This work reports for the first time on the synthesis, characterization, and photodynamic therapy efficacy of the novel aluminium (III) chloride 2(3), 9(10), 16(17), 23(24)-tetrakis-(sodium 2-mercaptoacetate) phthalocyanine (AlClPcTS41) when alone and when conjugated to PEGylated copper-gold bimetallic nanoparticles (PEG-CuAuNPs) as photosensitizers on colon cancer cells (Caco-2). The novel AlClPcTS41 was covalently linked to the PEG-CuAuNPs via an amide bond to form AlClPcTS41-PEG-CuAuNPs. The amide bond was successfully confirmed using FTIR while the crystal structures were studied using XRD. The morphological and size variations of the PEG-CuAuNPs and AlClPcTS41-PEG-CuAuNPs were studied using TEM, while the hydrodynamic sizes and polydispersity of the particles were confirmed using DLS. The ground state electron absorption spectra were also studied and confirmed the typical absorption of metallated phthalocyanines and their nanoparticle conjugates. Subsequently, the subcellular uptake, cellular proliferation, and PDT anti-tumor effect of AlClPcTS41, PEG-CuAuNPs, and AlClPcTS41-PEG-CuAuNPs were investigated within in vitro Caco-2 cells. The designed AlClPcTS41 and AlClPcTS41-PEG-CuAuNPs demonstrated significant ROS generation abilities that led to the PDT effect with a significantly decreased viable cell population after PDT treatment. These results demonstrate that the novel AlClPcTS41 and AlClPcTS41-PEG-CuAuNPs had remarkable PDT effects against Caco-2 cells and may trigger apoptosis cell death pathway, indicating the potential of the AlClPcTS41 and AlClPcTS41-PEG-CuAuNPs in enhancing the cytotoxic effect of PDT treatment.
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Koli P. Characterization, stability, and feasibility of long-term use of light-absorbing components of aqueous spinach extract-based photogalvanic electrolyte. Sci Rep 2022; 12:13518. [PMID: 35934715 PMCID: PMC9357696 DOI: 10.1038/s41598-022-17647-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Accepted: 07/28/2022] [Indexed: 11/09/2022] Open
Abstract
In the present work, the photogalvanic cells have been studied with respect to the photo-stability and the long-term use of the electrolyte based on crude aqueous spinach extract sensitizer for solar energy harvesting. Further, the nature of chemical components present in the old and photo-decayed electrolyte and their current generation capacity has also not been investigated so far otherwise it is of much significance for durable use of the same electrolyte in cells. In earlier studies, the steady-state photo-generation of current for about two hours from crude spinach extract-based cell has been shown during illumination. But, the data for only two hours of the steady-state current generation is not sufficient to show the feasibility of working with photogalvanic cells. Therefore, to fill this research gap of lack of characterization of sensitizers’ molecules of crude spinach extract and lack of study on long-term use of this electrolyte (crude spinach extract-surfactant-reductant-alkali-water), the present extensive study has been done. The observed spectrum of crude spinach extract resembles that of chlorophyll–protein complex showing it is the main chemical component in extract absorbing light. A strong acid adversely affects the extract’s photogalvanics and high pH is friendly to the physiological and photogalvanic activity of the extract. The spectra of illuminated and very old crude spinach extract-NaOH-Sodium lauryl sulfate (NaLS)-Fructose photogalvanic electrolyte solution show negligible absorbance (540–700 nm) and zero absorbance (at 700 nm) suggesting the absence of chlorophyll due to its photo-degradation. When this photo-degraded electrolyte is again illuminated, the power output obtained is nearly equal to that for the first time illuminated fresh electrolyte. The observed current at zero time and after 2641 h from the same electrolyte used in long term is 50 mA cm−2 and 40 mA cm−2, respectively. It means that the fresh crude spinach extract, as well as the photo-degraded extract at high pH, are almost equally capable of power generation.
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Versace DL, Breloy L, Brezova V, Abbad Andalloussi S, Malval JP, Richeter S, Clément S. Bio-based porphyrins pyropheophorbide a and its Zn-complex as performing visible-light photosensitizers for free-radical photopolymerization. Polym Chem 2022. [DOI: 10.1039/d1py01714d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A chlorophyll a derivative, namely pyropheophorbide a (Pyro), and the corresponding zinc (II) complex (Zn-Pyro) were used for the first time as performing visible-light photosensitizers (PS) for free-radical photopolymerization (FRP)...
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Mechanistic insight into photoactivation of small inorganic molecules from the biomedical applications perspectives. BIOMEDICAL APPLICATIONS OF INORGANIC PHOTOCHEMISTRY 2022. [DOI: 10.1016/bs.adioch.2022.06.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Komatsu Y, Takizawa K. A quantum chemical study on the effects of varying the central metal in extended photosynthetic pigments. Phys Chem Chem Phys 2021; 23:14404-14414. [PMID: 34180470 DOI: 10.1039/d1cp00760b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In a certain period of Earth's history, chlorophylls with Mg as their central metal would have been selected as the major photosynthetic pigments, reflecting the radiation in habitats. Assuming evolution in different light and material environments, different photosynthetic pigments would occur. This study is the first attempt to evaluate the physical and chemical properties of model photosynthetic pigments and their potential to function in a variety of light environments using quantum chemistry calculations. Specifically, bacteriochlorophyll b (Bchl b), phthalocyanine (Pht) and meso-dibenzoporphycene (mDBPc) were selected as template molecules, while Be, Mg, Ca, Ni, Zn, Sr, Pd, Cd, Ba, Pt, Hg, Pb and H2 were examined as the central metals in each molecule in various solvents. The results showed that the light absorption by each of these compounds varied over a range of 100 nm depending on the central metal and the surrounding solvent, and Pb produced the largest red shift in the absorption bands of all three photosynthetic pigments. The Pht molecules showed similar redox properties to the chlorophylls, suggesting that these derivatives could be substituted for the special pairs in reaction centers, while the mDBPc molecules appear to be more suitable as accessory pigments due to their extraordinarily broad absorption ranges of approximately 500 nm depending on the conditions.
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Affiliation(s)
- Yu Komatsu
- AstroBiology Center, Osawa 2-21-1, Mitaka, Tokyo, Japan. and National Astronomical Observatory of Japan, Osawa 2-21-1, Mitaka, Tokyo, Japan
| | - Kenji Takizawa
- AstroBiology Center, Osawa 2-21-1, Mitaka, Tokyo, Japan. and National Institute for Basic Biology, Nishigonaka 38, Myodaiji, Okazaki, Aichi, Japan
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Pobłocki K, Drzeżdżon J, Kostrzewa T, Jacewicz D. Coordination Complexes as a New Generation Photosensitizer for Photodynamic Anticancer Therapy. Int J Mol Sci 2021; 22:8052. [PMID: 34360819 PMCID: PMC8348047 DOI: 10.3390/ijms22158052] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Revised: 07/23/2021] [Accepted: 07/26/2021] [Indexed: 02/07/2023] Open
Abstract
Photodynamic therapy (PDT) has become an alternative to standard cancer treatment methods such as surgery, chemotherapy and radiotherapy. The uniqueness of this method relies on the possibility of using various photosensitizers (PS) that absorb and convert light emission in radical oxygen-derived species (ROS). They can be present alone or in the presence of other compounds such as metal organic frameworks (MOFs), non-tubules or polymers. The interaction between DNA and metal-based complexes plays a key role in the development of new anti-cancer drugs. The use of coordination compounds in PDT has a significant impact on the amount ROS generated, quantum emission efficiency (Φem) and phototoxic index (PI). In this review, we will attempt to systematically review the recent literature and analyze the coordination complexes used as PS in PDT. Finally, we compared the anticancer activities of individual coordination complexes and discuss future perspectives. So far, only a few articles link so many transition metal ion coordination complexes of varying degrees of oxidation, which is why this review is needed by the scientific community to further expand this field worldwide. Additionally, it serves as a convenient collection of important, up-to-date information.
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Affiliation(s)
- Kacper Pobłocki
- Department of Environmental Technology, Faculty of Chemistry, University of Gdansk, Wita Stwosza 63, 80-308 Gdansk, Poland; (K.P.); (D.J.)
| | - Joanna Drzeżdżon
- Department of Environmental Technology, Faculty of Chemistry, University of Gdansk, Wita Stwosza 63, 80-308 Gdansk, Poland; (K.P.); (D.J.)
| | - Tomasz Kostrzewa
- Department of Medical Chemistry, Faculty of Medicine, Medical University of Gdansk, 80-211 Gdansk, Poland;
| | - Dagmara Jacewicz
- Department of Environmental Technology, Faculty of Chemistry, University of Gdansk, Wita Stwosza 63, 80-308 Gdansk, Poland; (K.P.); (D.J.)
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Nishinaka K, Han J, Han D, Liu Y, Du Y, Wang M, Eerdun C, Naruse N, Mera Y, Furusho Y, Tsuda A. A Chiral Metal-Organic 1D-Coordination Polymer Upon Complexation of Phenylene-Bridged Bipyrrole and Palladium (II) Ion. Front Chem 2020; 8:613932. [PMID: 33335891 PMCID: PMC7736045 DOI: 10.3389/fchem.2020.613932] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2020] [Accepted: 11/06/2020] [Indexed: 11/13/2022] Open
Abstract
Metal-organic 1D-coordination polymers, having unique electronic and optical properties, are expected to be a novel advanced functional material capable of fabricating smart plastics, films, and fibers. In this study, we have synthesized a novel metal-organic 1D-coordination polymer composed of a phenylene-bridged bipyrrole bearing N-alkylimino groups (BPI) and palladium(II) ion. The BPI and Pd(II) form square planar bis(bidentate) complex to form a metal coordinated π-conjugation polymer (Poly-BPI/Pd). It is stable in solutions at room temperature, and allowed measurement of its average molecular weight in SEC (M w = 106,000 and M n = 18,000, M w/M n = 5.88). It also provided a reversible multi redox profile in cyclic voltammetry, most likely originating from strong π-electronic interactions between the BPI components via Pd ion. A variety of substituent groups can be attached to the imino-nitrogens of BPI. A coordination polymer composed of a BPI derivative bearing chiral alkyl chains and Pd(II) showed strong circular dichroism (CD) in the solution due to the unidirectional chiral conformation of the BPI components in the polymer backbone.
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Affiliation(s)
- Kumiko Nishinaka
- Department of Chemistry, Graduate School of Science, Kobe University, Kobe, Japan
| | - Jiandong Han
- Department of Pharmaceutical Sciences, Inner Mongolia Medical University, Hohhot, China
| | - Dongli Han
- Department of Pharmaceutical Sciences, Inner Mongolia Medical University, Hohhot, China
| | - Yue Liu
- Department of Chemistry, Graduate School of Science, Kobe University, Kobe, Japan
| | - Yanqing Du
- Department of Pharmaceutical Sciences, Inner Mongolia Medical University, Hohhot, China
| | - Meiling Wang
- Department of Pharmaceutical Sciences, Inner Mongolia Medical University, Hohhot, China
| | - Chaolu Eerdun
- Department of Pharmaceutical Sciences, Inner Mongolia Medical University, Hohhot, China
| | - Nobuyasu Naruse
- Department of Chemistry, Shiga University of Medical Science, Otsu, Japan
| | - Yutaka Mera
- Department of Chemistry, Shiga University of Medical Science, Otsu, Japan
| | - Yoshio Furusho
- Department of Chemistry, Shiga University of Medical Science, Otsu, Japan
| | - Akihiko Tsuda
- Department of Chemistry, Graduate School of Science, Kobe University, Kobe, Japan
- Department of Pharmaceutical Sciences, Inner Mongolia Medical University, Hohhot, China
- Department of Chemistry, Shiga University of Medical Science, Otsu, Japan
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9
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Taniguchi M, Lindsey JS. Absorption and Fluorescence Spectral Database of Chlorophylls and Analogues. Photochem Photobiol 2020; 97:136-165. [PMID: 32757305 DOI: 10.1111/php.13319] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 07/28/2020] [Accepted: 07/30/2020] [Indexed: 12/29/2022]
Abstract
Absorption spectra and fluorescence spectra are essential for use across the photosciences, yet such spectra along with the all-important values for molar absorption coefficient (ε) and fluorescence quantum yield (Φf ) often are found with great difficulty. Here, a literature survey concerning the vital class of chlorophyll compounds has led to identification of spectra for 150 members. Spectra in print form have been digitized (with baseline corrections) and assembled into a database along with literature references, solvent identity and values for ε and Φf (where available). The database encompasses photosynthetic tetrapyrroles wherein the chromophore is a porphyrin (e.g. chlorophyll c1 , protochlorophyll a), chlorin (e.g. chlorophyll a, bacteriochlorophyll c) or bacteriochlorin (e.g. bacteriochlorophyll a). Altogether, the database contains 305 absorption spectra (from 19 porphyrins, 109 chlorins and 22 bacteriochlorins) and 72 fluorescence spectra (from 10 porphyrins, 30 chlorins and 4 bacteriochlorins). The spectral database should facilitate comparisons and quantitative calculations. All spectra are available in print form in the Supporting Information. The entire database in digital form is available with the PhotochemCAD program for free downloading and further use at http://www.photochemcad.com.
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Pucelik B, Sułek A, Dąbrowski JM. Bacteriochlorins and their metal complexes as NIR-absorbing photosensitizers: properties, mechanisms, and applications. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213340] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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11
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Effects of palladium ions on light-harvesting complex 2 lacking B800 bacteriochlorophyll a. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2020.112593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Lingvay M, Akhtar P, Sebők-Nagy K, Páli T, Lambrev PH. Photobleaching of Chlorophyll in Light-Harvesting Complex II Increases in Lipid Environment. FRONTIERS IN PLANT SCIENCE 2020; 11:849. [PMID: 32670321 PMCID: PMC7327537 DOI: 10.3389/fpls.2020.00849] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 05/26/2020] [Indexed: 05/18/2023]
Abstract
Excess light causes damage to the photosynthetic apparatus of plants and algae primarily via reactive oxygen species. Singlet oxygen can be formed by interaction of chlorophyll (Chl) triplet states, especially in the Photosystem II reaction center, with oxygen. Whether Chls in the light-harvesting antenna complexes play direct role in oxidative photodamage is less clear. In this work, light-induced photobleaching of Chls in the major trimeric light-harvesting complex II (LHCII) is investigated in different molecular environments - protein aggregates, embedded in detergent micelles or in reconstituted membranes (proteoliposomes). The effects of intense light treatment were analyzed by absorption and circular dichroism spectroscopy, steady-state and time-resolved fluorescence and EPR spectroscopy. The rate and quantum yield of photobleaching was estimated from the light-induced Chl absorption changes. Photobleaching occurred mainly in Chl a and was accompanied by strong fluorescence quenching of the remaining unbleached Chls. The rate of photobleaching increased by 140% when LHCII was embedded in lipid membranes, compared to detergent-solubilized LHCII. Removing oxygen from the medium or adding antioxidants largely suppressed the bleaching, confirming its oxidative mechanism. Singlet oxygen formation was monitored by EPR spectroscopy using spin traps and spin labels to detect singlet oxygen directly and indirectly, respectively. The quantum yield of Chl a photobleaching in membranes and detergent was found to be 3.4 × 10-5 and 1.4 × 10-5, respectively. These values compare well with the yields of ROS production estimated from spin-trap EPR spectroscopy (around 4 × 10-5 and 2 × 10-5). A kinetic model is proposed, quantifying the generation of Chl and carotenoid triplet states and singlet oxygen. The high quantum yield of photobleaching, especially in the lipid membrane, suggest that direct photodamage of the antenna occurs with rates relevant to photoinhibition in vivo. The results represent further evidence that the molecular environment of LHCII has profound impact on its functional characteristics, including, among others, the susceptibility to photodamage.
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Affiliation(s)
- Mónika Lingvay
- Institute of Plant Biology, Biological Research Centre, Szeged, Hungary
- Doctoral School of Physics, Faculty of Science and Informatics, University of Szeged, Szeged, Hungary
| | - Parveen Akhtar
- Institute of Plant Biology, Biological Research Centre, Szeged, Hungary
| | | | - Tibor Páli
- Institute of Biophysics, Biological Research Centre, Szeged, Hungary
| | - Petar H. Lambrev
- Institute of Plant Biology, Biological Research Centre, Szeged, Hungary
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Tuning the Photophysical Features of Self-Assembling Photoactive Polypeptides for Light-Harvesting. MATERIALS 2019; 12:ma12213554. [PMID: 31671513 PMCID: PMC6862114 DOI: 10.3390/ma12213554] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 10/25/2019] [Accepted: 10/27/2019] [Indexed: 01/03/2023]
Abstract
The LH1 complex is the major light-harvesting antenna of purple photosynthetic bacteria. Its role is to capture photons, and then store them and transfer the excitation energy to the photosynthetic reaction center. The structure of LH1 is modular and it cooperatively self-assembles from the subunits composed of short transmembrane polypeptides that reversibly bind the photoactive cofactors: bacteriochlorophyll and carotenoid. LH1 assembly, the intra-complex interactions and the light-harvesting features of LH1 can be controlled in micellar media by varying the surfactant concentration and by adding carotenoid and/or a co-solvent. By exploiting this approach, we can manipulate the size of the assembly, the intensity of light absorption, and the energy and lifetime of its first excited singlet state. For instance, via the introduction of Ni-substituted bacteriochlorophyll into LH1, the lifetime of this electronic state of the antenna can be shortened by almost three orders of magnitude. On the other hand, via the exchange of carotenoid, light absorption in the visible range can be tuned. These results show how in a relatively simple self-assembling pigment-polypeptide system a sophisticated functional tuning can be achieved and thus they provide guidelines for the construction of bio-inspired photoactive nanodevices.
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Rydzyński D, Piotrowicz-Cieślak AI, Grajek H, Wasilewski J. Investigation of chlorophyll degradation by tetracycline. CHEMOSPHERE 2019; 229:409-417. [PMID: 31082708 DOI: 10.1016/j.chemosphere.2019.05.035] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 04/30/2019] [Accepted: 05/04/2019] [Indexed: 06/09/2023]
Abstract
Antibiotics represent a novel type of environment pollutants which modify chlorophyll content in plants. Spectroscopic methods were employed to investigate the effect of tetracycline on chlorophyll degradation. Changes in absorbance and fluorescence demonstrated that tetracycline reaction with chlorophyll results in the formation of pheophytin, which was confirmed by new bands typical of pheophytin which appeared in the absorbance spectrum. The rate of pheophytin formation depended on ratio tetracycline to chlorophyll concentration in solution. In solutions with chlorophyll concentration of C = 1 × 10-5 M and tetracycline concentrations of C = 1 × 10-3 M and C = 1 × 10-2 M, pheophytin was formed after 28 h and 25 min, respectively. The obtained lifetime for pheophytin formed during chlorophyll reaction - with tetracycline hydrochloride was τ = 5.71 ± 0.02 ns and its value coincides, within the error limits, with the value obtained for pure pheophytin purchased from ChromaDex. The experiment demonstrated two mechanisms of chlorophyll degradation to pheophytin by tetracycline hydrochloride, i.e. 1) loss of Mg2+ ions from the chlorophyll molecule as a result of the presence of H+ ions in solution (i.e. as a result of medium acidification), and 2) removal of Mg2+ ions directly from chlorophyll by tetracycline which binds Mg2+ ions from the chlorophyll. We demonstrated that magnesium occurring in low concentrations attached to a tetracycline molecule in the BCD ring, and that the second ion of Mg2+ may attach to the A ring of tetracycline at higher Mg2+ concentrations. Two fluorescence bands appeared which indicated such magnesium attachments indeed occurred.
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Affiliation(s)
- Dariusz Rydzyński
- Department of Plant Physiology, Genetics and Biotechnology, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, Oczapowskiego 1A, 10-718, Olsztyn, Poland; Department of Physics and Biophysics, Faculty of Food Science, University of Warmia and Mazury in Olsztyn, Oczapowskiego 4, 10-719, Olsztyn, Poland
| | - Agnieszka I Piotrowicz-Cieślak
- Department of Plant Physiology, Genetics and Biotechnology, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, Oczapowskiego 1A, 10-718, Olsztyn, Poland.
| | - Hanna Grajek
- Department of Physics and Biophysics, Faculty of Food Science, University of Warmia and Mazury in Olsztyn, Oczapowskiego 4, 10-719, Olsztyn, Poland
| | - Janusz Wasilewski
- Department of Biochemistry, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, Oczapowskiego 1A, 10-718, Olsztyn, Poland
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Matlou GG, Oluwole DO, Prinsloo E, Nyokong T. Photodynamic therapy activity of zinc phthalocyanine linked to folic acid and magnetic nanoparticles. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2018; 186:216-224. [PMID: 30077918 DOI: 10.1016/j.jphotobiol.2018.07.025] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Revised: 07/13/2018] [Accepted: 07/25/2018] [Indexed: 01/25/2023]
Abstract
In this work, the photodynamic therapy (PDT) activities (using human carcinoma adherent MCF-7 cells) of zinc phthalocyanine derivatives: complexes 1 (Zn mono cinnamic acid phthalocyanine) and 2 (zinc mono carboxyphenoxy phthalocyanine) when covalently linked to folic acid (FA) and amine functionalized magnetic nanoparticles (AMNPs) are reported. The covalent linkage of asymmetric zinc cinnamic acid Pc (1) to FA (1-FA) through an amide bond is reported for the first time. Complex 1 is insoluble in water, but upon linkage to FA, (to form 1-FA) the molecule become water soluble, hence the UV-Vis spectrum and singlet oxygen quantum yield for 1-FA were also done in water since water solubility is essential for biological applications. The reported 2-FA is also water soluble. Linking complexes 1 and 2 to FA and AMNPs decreased the dark toxicity of 1 and 2 on MCF-7 cells. Pc-FA (1-FA and 2-FA) conjugates had better singlet oxygen quantum yields (Φ∆) in DMSO as compared to Pc-AMNPs (1-AMNPs and 2-AMNPs). The water- soluble 1-FA and 2-FA also achieved a better photodynamic therapy (PDT) activity as compared to 1-AMNPs and 2-AMNPs. Folic acid targeting on the tumor cells may have also facilitated better bioavailability of 1-FA and 2-FA and improved PDT activity on MCF-7 cells over AMNPs carriers.
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Affiliation(s)
- Gauta Gold Matlou
- Centre for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa
| | - David O Oluwole
- Centre for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa
| | - Earl Prinsloo
- Biotechnology Innovation Centre, Rhodes University, Grahamstown 6140, South Africa
| | - Tebello Nyokong
- Centre for Nanotechnology Innovation, Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa.
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16
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Wang G, Wang Y, Meng R, Zhang Y, Xing Y, Xu X, Niu J. Synthesis and spectroscopic properties of silver-fluorescein co-doped phosphotungstate hollow spheres. Dalton Trans 2018; 47:7730-7738. [PMID: 29808180 DOI: 10.1039/c7dt04873d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, silver-fluorescein co-doped phosphotungstate hollow spheres have been successfully synthesized using a chemical precipitation method by introducing silver ions and fluorescein at room temperature. This hybrid nanomaterial possesses a uniform structure, exhibiting a strong emission spectrum with a peak centered at 517 nm. It is anticipated that silver and fluorescein as functionalized dopants for the phosphotungstate hollow sphere structure would provide this material with multiple properties. The control experiments indicate that fluorescein plays a key role in the formation of the hollow sphere structure. Hence, the co-doping strategy is proposed to be a general method to endow polyoxometalate nanomaterials with new structures, new functions and potential applications in bioimaging, fluorescent chemical sensors, and antibacterial or optoelectronic devices.
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Affiliation(s)
- Guan Wang
- Henan Key Laboratory of Polyoxometalate Chemistry, Institute of Molecular and Crystal Engineering, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan, China.
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17
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Singlet and triplet excited states dynamics of photosynthetic pigment chlorophyll a investigated by sub-nanosecond pump-probe spectroscopy. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2017.09.046] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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18
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Nwahara N, Achadu OJ, Nyokong T. In-situ synthesis of gold nanoparticles on graphene quantum dots-phthalocyanine nanoplatforms: First description of the photophysical and surface enhanced Raman scattering behaviour. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.04.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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19
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Feng Y, Cheng H, Han J, Zheng X, Liu Y, Yang Y, Zhang L. Chlorophyll sensitized BiVO 4 as photoanode for solar water splitting and CO 2 conversion. CHINESE CHEM LETT 2017. [DOI: 10.1016/j.cclet.2017.10.025] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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20
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Kotkowiak M, Dudkowiak A, Fiedor L. Intrinsic Photoprotective Mechanisms in Chlorophylls. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201705357] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Michał Kotkowiak
- Faculty of Technical Physics; Poznan University of Technology; Piotrowo 3 60-965 Poznan Poland
| | - Alina Dudkowiak
- Faculty of Technical Physics; Poznan University of Technology; Piotrowo 3 60-965 Poznan Poland
| | - Leszek Fiedor
- Faculty of Biochemistry, Biophysics and Biotechnology; Jagiellonian University; Gronostajowa 7 30-387 Krakow Poland
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21
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Kotkowiak M, Dudkowiak A, Fiedor L. Intrinsic Photoprotective Mechanisms in Chlorophylls. Angew Chem Int Ed Engl 2017; 56:10457-10461. [DOI: 10.1002/anie.201705357] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Indexed: 11/12/2022]
Affiliation(s)
- Michał Kotkowiak
- Faculty of Technical Physics; Poznan University of Technology; Piotrowo 3 60-965 Poznan Poland
| | - Alina Dudkowiak
- Faculty of Technical Physics; Poznan University of Technology; Piotrowo 3 60-965 Poznan Poland
| | - Leszek Fiedor
- Faculty of Biochemistry, Biophysics and Biotechnology; Jagiellonian University; Gronostajowa 7 30-387 Krakow Poland
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22
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Orzeł Ł, Waś J, Kania A, Susz A, Rutkowska-Zbik D, Staroń J, Witko M, Stochel G, Fiedor L. Factors controlling the reactivity of divalent metal ions towards pheophytin a. J Biol Inorg Chem 2017. [PMID: 28639057 PMCID: PMC5517585 DOI: 10.1007/s00775-017-1472-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
In this study, we evaluate the factors which determine the reactivity of divalent metal ions in the spontaneous formation of metallochlorophylls, using experimental and computational approaches. Kinetic studies were carried out using pheophytin a in reactions with various divalent metal ions combined with non- or weakly-coordinative counter ions in a series of organic solvents. To obtain detailed insights into the solvent effect, the metalations with the whole set of cations were investigated in three solvents and with Zn2+ in seven solvents. The reactions were monitored using electronic absorption spectroscopy and the stopped-flow technique. DFT calculations were employed to shed light on the role of solvent in activating the metal ions towards porphyrinoids. This experimental and computational analysis gives detailed information regarding how the solvent and the counter ion assist/hinder the metalation reaction as activators/inhibitors. The metalation course is dictated to a large extent by the reaction medium, via either the activation or deactivation of the incoming metal ion. The solvent may affect the metalation in several ways, mainly via H-bonding with pyrrolenine nitrogens and the activation/deactivation of the incoming cation. It also seems to affect the activation enthalpy by causing slight conformational changes in the macrocyclic ligand. These new mechanistic insights contribute to a better understanding of the “metal–counterion–solvent” interplay in the metalation of porphyrinoids. In addition, they are highly relevant to the mechanisms of metalation reactions catalyzed by chelatases and explain the differences between the insertion of Mg2+ and other divalent cations.
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Affiliation(s)
- Ł Orzeł
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060, Kraków, Poland.
| | - J Waś
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060, Kraków, Poland
- Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387, Kraków, Poland
| | - A Kania
- Institute of Biology, Pedagogical University of Cracow, Podchorążych 2, 30-084, Kraków, Poland
| | - A Susz
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060, Kraków, Poland
- Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387, Kraków, Poland
| | - D Rutkowska-Zbik
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239, Kraków, Poland
| | - J Staroń
- Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387, Kraków, Poland
- Institute of Pharmacology, Polish Academy of Sciences, Smętna 12, 31-343, Kraków, Poland
| | - M Witko
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239, Kraków, Poland
| | - G Stochel
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060, Kraków, Poland
| | - L Fiedor
- Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387, Kraków, Poland.
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23
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Hashemizadeh I, Tsang DCW, Ng YH, Wu Z, Golovko V, Yip ACK. Bio-mimicking TiO2 architectures for enhanced photocatalytic activity under UV and visible light. RSC Adv 2017. [DOI: 10.1039/c7ra04185c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A multi-step chemical replication method using natural green leaves as templates can produce a porous, visible-light active TiO2-based photocatalyst.
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Affiliation(s)
- Iman Hashemizadeh
- Department of Chemical and Process Engineering
- University of Canterbury
- Christchurch
- New Zealand
| | - Daniel C. W. Tsang
- Department of Civil and Environmental Engineering
- Hong Kong Polytechnic University
- Hong Kong
- China
| | - Yun Hau Ng
- School of Chemical Engineering
- University of New South Wales
- Australia
- The Joint Laboratory for Energy and Environmental Catalysis
- City University of Hong Kong
| | - Zhijie Wu
- State Key Laboratory of Heavy Oil Processing
- The Key Laboratory of Catalysis of CNPC
- China University of Petroleum
- Beijing
- China
| | - Vladimir Golovko
- Department of Chemistry
- University of Canterbury
- Christchurch
- New Zealand
| | - Alex C. K. Yip
- Department of Chemical and Process Engineering
- University of Canterbury
- Christchurch
- New Zealand
- The Joint Laboratory for Energy and Environmental Catalysis
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24
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Ma X, Wang Q, Rossi L, Zhang W. Cerium Oxide Nanoparticles and Bulk Cerium Oxide Leading to Different Physiological and Biochemical Responses in Brassica rapa. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:6793-802. [PMID: 26691446 DOI: 10.1021/acs.est.5b04111] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Cerium oxide nanoparticles (CeO2NPs) have been incorporated into many commercial products, and their potential release into the environment through the use and disposal of these products has caused serious concerns. Despite the previous efforts and rapid progress on elucidating the environmental impact of CeO2NPs, the long-term impact of CeO2NPs to plants, a key component of the ecosystem, is still not well understood. The potentially different impact of CeO2NPs and their bulk counterparts to plants is also unclear. The main objectives of this study were (1) to investigate whether continued irrigation with solutions containing different concentrations of CeO2NPs (0, 10, and 100 mg/L) would induce physiological and biochemical adjustments in Brassica rapa in soil growing conditions and (2) to determine whether CeO2NPs and bulk CeO2 particles exert different impacts on plants. The results indicated that bulk CeO2 at 10 and 100 mg/L enhanced plant biomass by 28% and 35%, respectively, while CeO2NPs at equivalent concentrations did not. While the bulk CeO2 treatment resulted in significantly higher concentrations of hydrogen peroxide (H2O2) in plant tissues at the vegetative stage, CeO2NPs led to significantly higher H2O2 levels in plant tissues at the floral stage. The activity of superoxide dismutase (SOD) in Brassica rapa also displayed a growth-stage dependent response to different sizes of CeO2 while catalase (CAT) activity was not affected by either size of CeO2 throughout the life cycle of Brassica rapa. Altogether, the results demonstrated that plant responses to CeO2 exposure varied with the particle sizes and the growth stages of plants.
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Affiliation(s)
- Xingmao Ma
- Zachry Department of Civil Engineering, Texas A&M University , 3136 TAMU, College Station, Texas 77843-3136, United States
| | - Qiang Wang
- Department of Civil and Environmental Engineering, Southern Illinois University , Carbondale, Illinois 62901, United States
| | - Lorenzo Rossi
- Zachry Department of Civil Engineering, Texas A&M University , 3136 TAMU, College Station, Texas 77843-3136, United States
| | - Weilan Zhang
- Zachry Department of Civil Engineering, Texas A&M University , 3136 TAMU, College Station, Texas 77843-3136, United States
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25
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Begović L, Mlinarić S, Antunović Dunić J, Katanić Z, Lončarić Z, Lepeduš H, Cesar V. Response of Lemna minor L. to short-term cobalt exposure: The effect on photosynthetic electron transport chain and induction of oxidative damage. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2016; 175:117-26. [PMID: 27015565 DOI: 10.1016/j.aquatox.2016.03.009] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Revised: 03/03/2016] [Accepted: 03/08/2016] [Indexed: 05/06/2023]
Abstract
The effect of two concentrations of cobalt (Co(2+)) on photosynthetic activity and antioxidative response in Lemna minor L. were assessed 24, 48 and 72h after the start of the exposure. Higher concentration of cobalt (1mM) induced growth inhibition while lower concentration (0.01mM) increased photosynthetic pigments content. Analysis of chlorophyll a fluorescence transients revealed high sensitivity of photosystem II primary photochemistry to excess of Co(2+) especially at the higher concentration where decreased electron transport beyond primary quinone acceptor QA(-) and impaired function of oxygen evolving complex (OEC) was observed. Due to impairment of OEC, oxygen production was decreased at higher Co(2+) concentration. Activity of superoxide dismutase was mainly inhibited while lipid peroxidation increased, at both concentrations, indicating that cobalt-induced oxidative damage after short exposure and moreover, susceptibility of the membranes in the cell to cobalt toxicity. Results obtained in this study suggest possible application of used parameters as tools in assessment of early damage caused by metals.
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Affiliation(s)
- Lidija Begović
- Josip Juraj Strossmayer University of Osijek, Department of Biology, Ulica cara Hadrijana 8/A, HR-31000 Osijek, Croatia.
| | - Selma Mlinarić
- Josip Juraj Strossmayer University of Osijek, Department of Biology, Ulica cara Hadrijana 8/A, HR-31000 Osijek, Croatia.
| | - Jasenka Antunović Dunić
- Josip Juraj Strossmayer University of Osijek, Department of Biology, Ulica cara Hadrijana 8/A, HR-31000 Osijek, Croatia.
| | - Zorana Katanić
- Josip Juraj Strossmayer University of Osijek, Department of Biology, Ulica cara Hadrijana 8/A, HR-31000 Osijek, Croatia.
| | - Zdenko Lončarić
- Faculty of Agriculture, Josip Juraj Strossmayer University of Osijek, Ulica kralja Petra Svačića 1d, HR-31000 Osijek, Croatia.
| | - Hrvoje Lepeduš
- Faculty of Humanities and Social Sciences, Josip Juraj Strossmayer University of Osijek, Lorenza Jägera 9, HR-31000 Osijek, Croatia.
| | - Vera Cesar
- Josip Juraj Strossmayer University of Osijek, Department of Biology, Ulica cara Hadrijana 8/A, HR-31000 Osijek, Croatia.
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26
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Wenceslau AC, Ferreira GLQC, Hioka N, Caetano W. Spectroscopic studies of pyridil and methoxyphenyl porphyrins in homogeneous and Pluronic®-based nanostructured systems. J PORPHYR PHTHALOCYA 2016. [DOI: 10.1142/s1088424615500996] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Spectroscopic properties of Porphyrins TPyP (tetra(4-pyridil)porphyrin), TMPP (tetrakis(4-methoxypheny) porphyrin) and its zinc metaled derivatives porphyrins Zn-TPyP and Zn-TMPP respectively, were studied in homogeneous and micro heterogeneous systems, comprising nanostructured Pluronic® copolymeric micellar systems, as a promising drug delivery systems for the porphyrins investigated. Physico-chemical properties such as, hydrophobicity degree, self- aggregation in solvents of different polarities and water/ethanol mixtures (monofasic binary), as well as kinetics profile and isotherm binding, molecular organization, [Formula: see text] and relative localization in neutral micellar systems. The hydrophobic character was the key to relative drug location in the micellar systems. In homogenous solvents systems the porphyrins presented relatively high values of molar absorptivity and low values of [Formula: see text]. The K[Formula: see text] values obtained are modulated by the structure of porphyrins, state of aggregation, as well as, structure and macro molecular self-organization of copolymers. Fluorescence quenching studies have shown that porphyrins in F-127 are located in a less hydrophobic region than the porphyrins in P-123, which are located preferentially in a deeper micellar microenvironment. The zinc porphyrins showed high values of K[Formula: see text]. Thus, the association of the porphyrins with specific binding sites of micellar systems is strongly modulated by the presence of the metal coordinated to the porphyrinic ring.
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Affiliation(s)
- Adriana C. Wenceslau
- Departamento de Química, Universidade Estadual de Maringá - Av. Colombo 5790, 87020-970 Maringá-PR, Brazil
| | | | - Noboru Hioka
- Departamento de Química, Universidade Estadual de Maringá - Av. Colombo 5790, 87020-970 Maringá-PR, Brazil
| | - Wilker Caetano
- Departamento de Química, Universidade Estadual de Maringá - Av. Colombo 5790, 87020-970 Maringá-PR, Brazil
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27
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Oba T, Miyata K, Masuya T, Yasuda S, Ito S. Selective synthesis of C32- and C20-monoiodinated chlorophyll derivatives. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.01.057] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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28
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Calogero G, Citro I, Crupi C, Di Marco G. Absorption spectra and photovoltaic characterization of chlorophyllins as sensitizers for dye-sensitized solar cells. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 132:477-484. [PMID: 24892526 DOI: 10.1016/j.saa.2014.04.196] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2014] [Revised: 04/23/2014] [Accepted: 04/30/2014] [Indexed: 06/03/2023]
Abstract
Dye-sensitized solar cells (DSSCs) based on Chlorine-e6 (Chl-e6), a Chlorophyll a derivative, and Chl-e6 containing Cu, have been investigated by carrying out incident photon to current efficiency (IPCE) and current-voltage (I-V) measurements. The effect of the metallic ion and the influence of the solvent polarity on the dye aggregation and their absorption bands have been analysed by performing electronic absorption measurements. The dependence of the photoelectrochemical parameters of these DSSCs on the electrolyte by the addition of pyrimidine and/or pyrrole has been discussed in details. For the first time I-V curves for a DSSC based on copper Chl-e6 dye have been shown and compared with Zn based chlorophyllin. Furthermore, the performance of a Cu-Chl-e6 based DSSC has been deeply improved by a progressive optimization of the TiO2 multilayer photoanode overcoming the best data reported in literature so far for this dye. It's worth to emphasize that, the analysis reported in this paper supplies very useful information which paves the way to further detailed studies turned to the employment of natural pigments as sensitizers for solar cells.
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Affiliation(s)
- Giuseppe Calogero
- CNR-IPCF, Istituto per i Processi Chimico-Fisici, via F. Stagno D'Alcontres 37, I-98158 Messina, Italy.
| | - Ilaria Citro
- CNR-IPCF, Istituto per i Processi Chimico-Fisici, via F. Stagno D'Alcontres 37, I-98158 Messina, Italy
| | - Cristina Crupi
- CNR-IPCF, Istituto per i Processi Chimico-Fisici, via F. Stagno D'Alcontres 37, I-98158 Messina, Italy
| | - Gaetano Di Marco
- CNR-IPCF, Istituto per i Processi Chimico-Fisici, via F. Stagno D'Alcontres 37, I-98158 Messina, Italy
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29
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Lessons from chlorophylls: modifications of porphyrinoids towards optimized solar energy conversion. Molecules 2014; 19:15938-54. [PMID: 25286377 PMCID: PMC6271569 DOI: 10.3390/molecules191015938] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Revised: 08/20/2014] [Accepted: 09/05/2014] [Indexed: 11/16/2022] Open
Abstract
Practical applications of photosynthesis-inspired processes depend on a thorough understanding of the structures and physiochemical features of pigment molecules such as chlorophylls and bacteriochlorophylls. Consequently, the major structural features of these pigments have been systematically examined as to how they influence the S1 state energy, lifetimes, quantum yields, and pigment photostability. In particular, the effects of the macrocyclic π-electron system, central metal ion (CMI), peripheral substituents, and pigment aggregation, on these critical parameters are discussed. The results obtained confirm that the π-electron system of the chromophore has the greatest influence on the light energy conversion capacity of porphyrinoids. Its modifications lead to changes in molecular symmetry, which determine the energy levels of frontier orbitals and hence affect the S1 state properties. In the case of bacteriochlorophylls aggregation can also strongly decrease the S1 energy. The CMI may be considered as another influential structural feature which only moderately influences the ground-state properties of bacteriochlorophylls but strongly affects the singlet excited-state. An introduction of CMIs heavier than Mg2+ significantly improves pigments' photostabilities, however, at the expense of S1 state lifetime. Modifications of the peripheral substituents may also influence the S1 energy, and pigments’ redox potentials, which in turn influence their photostability.
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30
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Kania A, Pilch M, Rutkowska-Zbik D, Susz A, Heriyanto, Stochel G, Fiedor L. High-pressure and theoretical studies reveal significant differences in the electronic structure and bonding of magnesium, zinc, and nickel ions in metalloporphyrinoids. Inorg Chem 2014; 53:8473-84. [PMID: 25072655 DOI: 10.1021/ic501029b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
High pressure in combination with optical spectroscopy was used to gain insights into the interactions between Mg(2+), Zn(2+), and Ni(2+) ions and macrocyclic ligands of porphyrinoid type. In parallel, the central metal ion-macrocycle bonding was investigated using theoretical approaches. The symmetry properties of the orbitals participating in this bonding were analyzed, and pigment geometries and pressure/ligation effects were computed within DFT. Bacteriopheophytin a was applied as both a model chelator and a highly specific spectroscopic probe. The analysis of solvent and pressure effects on the spectral properties of the model Mg(2+), Zn(2+), and Ni(2+) complexes with bacteriopheophytin a shows that various chemical bonds are formed in the central pocket, depending on the valence configuration of the central metal ion. In addition, the character of this bonding depends on symmetry of the macrocyclic system. Since in most cases it is not coordinative bonding, these results challenge the conventional view of metal ion bonding in such complexes. In (labile) complexes with the main group metals, the metal ion-macrocycle interaction is mostly electrostatic. Significantly, water molecules are not preferred as a second axial ligand in such complexes, mainly due to the entropic constraints. The metal ions with a closed d shell may form (stable) complexes with the macrocycle via classical coordination bonds, engaging their p and s orbitals. Transition metals, due to the unfilled d shell, do form much more stable complexes, because of strong bonding via both coordination and covalent interactions. These conclusions are confirmed by DFT computations and theoretical considerations, which altogether provide the basis to propose a consistent and general mechanism of how the central metal ion and its interactions with the core nitrogens govern the physicochemical properties of metalloporphyrinoids.
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Affiliation(s)
- Agnieszka Kania
- Faculty of Chemistry, Jagiellonian University , ul. Ingardena 3, 30-060 Kraków, Poland
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31
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Chen J, Su H, Deng T, Zhang W, Lau WM, Zhang D. Bioinspired Au/N-TiO 2 photocatalyst templated from Zea mays Linn. leaves. BIOINSPIRED BIOMIMETIC AND NANOBIOMATERIALS 2014. [DOI: 10.1680/bbn.13.00012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
The leaves of Zea mays Linn. contain abundant nitrogen source and exhibit an extremely high light-harvesting efficiency due to its hierarchical internal structures. In this study, Z. mays Linn. leaves are used as template to generate Au/N-TiO2 nanocomposites through soakage, calcination and Au-nanoparticle-loading processes. Such nanocomposites replicate the special hierarchical structures of Z. mays Linn. leaves featured with lamellar structures at nanoscale, porous framework at microscale and scraggy-shaped epidermal at macroscale. The nitrogen contained in original leaves is doped into anatase TiO2 crystal lattice during the templating process, and Au nanoparticles (~5-nm dia.) are well dispersed at the surface of N-TiO2 structures. With multi-component composition and unique hierarchical structure, the Au/N-TiO2 nanocomposites present superior photocatalytic activity and stability, which are demonstrated through degradation of rhodamine dye under solar light irradiation. This article contains supporting information, which will be made available online once the issue is published. In the meantime, if you wish to get a copy of the supplementary file please contact the Managing Editor, Sohini Banerjee, at sohini.banerjee@icepublishing.com
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Affiliation(s)
- Jianjun Chen
- Doctoral student, State Key Lab of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, China
| | - Huilan Su
- Professor, State Key Lab of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, China
| | - Tao Deng
- Professor, State Key Lab of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, China
| | - Wang Zhang
- Assistant researcher, State Key Lab of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, China
| | - Woon-Ming Lau
- Professor, Beijing Computational Science Research Center, Beijing, China
- Chengdu Green Energy and Green Manufacturing Technology R&D Center, Chengdu, China
| | - Di Zhang
- Professor, State Key Lab of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, China
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Zinc-pheophorbide a—Highly efficient low-cost photosensitizer against human adenocarcinoma in cellular and animal models. Photodiagnosis Photodyn Ther 2013; 10:266-77. [DOI: 10.1016/j.pdpdt.2012.12.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2012] [Accepted: 12/29/2012] [Indexed: 11/20/2022]
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Jakubowska M, Michalczyk-Wetula D, Pyka J, Susz A, Urbanska K, Płonka BK, Kuleta P, Łącki P, Krzykawska-Serda M, Fiedor L, Płonka PM. Nitrosylhemoglobin in photodynamically stressed human tumors growing in nude mice. Nitric Oxide 2013; 35:79-88. [PMID: 23973529 DOI: 10.1016/j.niox.2013.08.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Revised: 07/26/2013] [Accepted: 08/15/2013] [Indexed: 01/21/2023]
Abstract
The role of nitric oxide in human tumor biology and therapy has been the subject of extensive studies. However, there is only limited knowledge about the mechanisms of NO production and its metabolism, and about the role NO can play in modern therapeutic procedures, such as photodynamic therapy. Here, for the first time, we report the presence of nitrosylhemoglobin, a stable complex of NO, in human lung adenocarcinoma A549 tumors growing in situ in nude mice. Using electron paramagnetic resonance spectroscopy we show that the level of nitrosylhemoglobin increases in the course of photodynamic therapy and that the phenomenon is local. Even the destruction of strongly vascularized normal liver tissue did not induce the paramagnetic signal, despite bringing about tissue necrosis. We conclude that photodynamic stress substantiates NO production and blood extravasation in situ, both processes on-going even in non-treated tumors, although at a lower intensity.
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Affiliation(s)
- Monika Jakubowska
- Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387 Kraków, Poland.
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Metallobacteriochlorophylls as potential dual agents for photodynamic therapy and chemotherapy. J Mol Model 2013; 19:4155-61. [PMID: 23306811 PMCID: PMC3778232 DOI: 10.1007/s00894-012-1747-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Accepted: 12/20/2012] [Indexed: 11/29/2022]
Abstract
A theoretical analysis of bacteriochlorophyll a containing its non-native divalent metal ions: Co, Ni, Cu, Zn, Ru, Rh, Pd, and Pt, has been carried out by means of density functional theory (DFT) calculations. The main stress was put on the derivatives with metals, which already found applications as coordination compounds in anti-tumor therapy (Ru, Pt, Pd, and Rh). The idea was to combine their cytotoxic properties with the known suitability of bacteriochlorophylls macrocycle for photodynamic therapy. The geometries of the studied systems are compared and reveal a number of similarities. The cores of the modified bacteriochlorophylls are flat, and the introduced metal ions lie in plane of the macrocycle, showing its large ability to accommodate metal ions of different sizes. However, four metal–nitrogen bonds, linking the central ions with the macrocycle ligand, are not equivalent. Metals are the strongest attached to nitrogens, which come from the pyrrole, which is fused with isocyclic ring. Based on the known spectroscopic data, the absorption properties of the proposed systems are predicted. Finally, it is found that all studied metal–macrocycle adducts are stable in aqueous media. The only exceptions are Mg-BChla (the finding is reflected by experimental facts) and Zn-BChla. The predicted high stability of Ru-, Rh-, Pt- and Pd-bacteriochlorophylls might turn out beneficial for therapeutic purposes.
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Molecular symmetry determines the mechanism of a very efficient ultrafast excitation-to-heat conversion in Ni-substituted chlorophylls. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2013; 1827:30-7. [DOI: 10.1016/j.bbabio.2012.09.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2012] [Revised: 08/20/2012] [Accepted: 09/10/2012] [Indexed: 11/19/2022]
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36
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Zhou L, Wei S, Ge X, Zhou J, Yu B, Shen J. External heavy-atomic construction of photosensitizer nanoparticles for enhanced in vitro photodynamic therapy of cancer. J Phys Chem B 2012; 116:12744-9. [PMID: 22984941 DOI: 10.1021/jp305137j] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Introduction of heavy atoms around photosensitizers (PSs) generally facilitates intersystem crossing (ISC) and improves their quantum yield of singlet oxygen ((1)O(2)) generation ability, which is a key species in photodynamic therapy (PDT). Here, we report Pt(IV)- and Au(III)-modified silica nanoparticles (SN) as the drug delivery system of a hypocrellin A (HA) to improve its photodynamic activity through external heavy atom effect. Comparative studies with Pt- and Au-modified and unmodified nanoparticles have demonstrated that the intraparticle external heavy atom effect on the encapsulated HA molecules significantly enhances their efficiency of (1)O(2) generation and, thereby, the in vitro photodynamic efficacy to cancer cells. The results well elucidated the potential of our PSs/heavy metal ions doped nanocarrier for improving the actual efficacy of PDT.
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Affiliation(s)
- Lin Zhou
- Analysis and Testing Center, College of Chemistry and Materials Science, Jiangsu Key Laboratory Biofunctional Materials, Nanjing Normal University, Nanjing 210046, China
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37
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Rutkowska-Zbik D, Witko M, Fiedor L. Ligation of water to magnesium chelates of biological importance. J Mol Model 2012. [PMID: 22643978 DOI: 10.1007/s00894.012.1459.3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Water binding to several Mg(2+) chelates, ethylenediamine, ethylenediamine-N,N'-diacetate, porphyrin, chlorophyll a and bacteriochlorophyll a, to form five- and six-coordinate complexes is studied by means of density functional theory. The results obtained for magnesium chelates are compared with the properties of the respective aqua complexes and the influence of the permittivity of environment on the ligand binding energies is discussed. Although the most common coordination number of Mg(2+) is six, in the tetrapyrrolic chelates it is reduced to five because the accommodation of the sixth water ligand results in no gain in energy. This is in line with the experimental observations made for coordination of chlorophylls in vivo. The binding between Mg(2+) and water is mostly of electrostatic nature, which is supported by the finding that its energy is correlated both with the electron density of the chelator and with electrostatic potential determined at the ligand binding site.
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Affiliation(s)
- Dorota Rutkowska-Zbik
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek 8, 30-239, Krakow, Poland,
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38
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Rutkowska-Zbik D, Witko M, Fiedor L. Ligation of water to magnesium chelates of biological importance. J Mol Model 2012; 19:4661-7. [PMID: 22643978 PMCID: PMC3825143 DOI: 10.1007/s00894-012-1459-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2011] [Accepted: 05/03/2012] [Indexed: 11/02/2022]
Abstract
Water binding to several Mg(2+) chelates, ethylenediamine, ethylenediamine-N,N'-diacetate, porphyrin, chlorophyll a and bacteriochlorophyll a, to form five- and six-coordinate complexes is studied by means of density functional theory. The results obtained for magnesium chelates are compared with the properties of the respective aqua complexes and the influence of the permittivity of environment on the ligand binding energies is discussed. Although the most common coordination number of Mg(2+) is six, in the tetrapyrrolic chelates it is reduced to five because the accommodation of the sixth water ligand results in no gain in energy. This is in line with the experimental observations made for coordination of chlorophylls in vivo. The binding between Mg(2+) and water is mostly of electrostatic nature, which is supported by the finding that its energy is correlated both with the electron density of the chelator and with electrostatic potential determined at the ligand binding site.
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Affiliation(s)
- Dorota Rutkowska-Zbik
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek 8, 30-239, Krakow, Poland,
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39
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Gerola AP, Semensato J, Pellosi DS, Batistela VR, Rabello BR, Hioka N, Caetano W. Chemical determination of singlet oxygen from photosensitizers illuminated with LED: New calculation methodology considering the influence of photobleaching. J Photochem Photobiol A Chem 2012. [DOI: 10.1016/j.jphotochem.2012.01.018] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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40
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Wagnert L, Berg A, Stavitski E, Luobeznova I, Gross Z, Levanon H. Structure-function relationship in antimony corrole photosensitizers: Time-resolved electron paramagnetic resonance and optical study. J PORPHYR PHTHALOCYA 2012. [DOI: 10.1142/s1088424607000758] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Three photosensitizers based on tris-(pentafluorophenyl)antimony corroles that differ in oxidation state and axial ligands, namely, (pyridine) Sb (III)-, (oxo) Sb (V)- and (difluoro) Sb (V) complexes, were studied by time-resolved electron paramagnetic resonance spectroscopy and laser flash photolysis. The magnetic and orientational parameters of the corroles oriented in a nematic liquid crystal as well as their triplet lifetimes in liquid toluene were determined and interpreted in terms of their structure and geometry. The negative zero-field splitting parameter D assigned to all studied corroles is explained by the asymmetric π-electron withdrawal effect caused by perfluorinated peripheral aryl groups, which force the triplet electron spins to align in head-to-tail configuration. The effect of the axial ligands on the photoexcited triplet state properties of the corroles is correlated with their different efficiency to perform photoassisted aerobic oxygenation of some organic molecules. This is explained by the dependence of the main parameters of the photoexcited complexes on the interaction between the central ion and corrole π-system. This interaction is strongly influenced by axial ligands coordination, affecting the macrocycle symmetry, planarity, and rigidity.
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Affiliation(s)
- Linn Wagnert
- Department of Physical Chemistry and Farkas Center for Light-Induced Processes, Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Alexander Berg
- Department of Physical Chemistry and Farkas Center for Light-Induced Processes, Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Eli Stavitski
- Department of Physical Chemistry and Farkas Center for Light-Induced Processes, Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Inna Luobeznova
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - Zeev Gross
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - Haim Levanon
- Department of Physical Chemistry and Farkas Center for Light-Induced Processes, Hebrew University of Jerusalem, Jerusalem 91904, Israel
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41
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Gerola AP, Tsubone TM, Santana A, de Oliveira HPM, Hioka N, Caetano W. Properties of chlorophyll and derivatives in homogeneous and microheterogeneous systems. J Phys Chem B 2011; 115:7364-73. [PMID: 21568354 DOI: 10.1021/jp201278b] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Chlorophyll (Mg-Chl) and its derivatives, zinc chlorophyll (Zn-Chl), copper chlorophyll (Cu-Chl), pheophytin (Pheo), pheophorbide (Pheid), and zinc chlorophyllide (Zn-Chld), were studied as to their acid-base equilibrium properties, hydrophobicity, stability, binding, and relative localization in neutral surfactant micellar systems. The stability order of metalochlorophyll (pH(M)) in acidic medium was found to be Cu-Chl > Zn-Chld > Zn-Chl > Mg-Chl. The apparent pK(a) for protonation of porphyrin ring nitrogens was around 1.0 for all derivatives. The pK(a) for protonation of carboxylate phorbide was 5.9 for Pheid and 2.4 for Zn-Chld. This difference was attributed to complexation of carboxylate with zinc. The hydrophobicity of chlorophyll in relation to the ability of partitioning the cell membrane lipid layer was estimated in the octanol/water biphasic system. Pheo, a more hydrophobic molecule, presented the highest partition coefficient (K(P)) in the organic phase, followed by Cu-Chl, Mg-Chl, Zn-Chl, Pheid, and Zn-Chld. The hydrophobic character was the key to relative drug location in the micellar systems. All studied derivatives interacted strongly with Tween 80 micellar systems, and particularly with P-123. For both surfactants, the order followed by binding constant (K(b)) was Zn-Chld > Pheo > Cu-Chl > Mg-Chl > Zn-Chl > Pheid, while binding constants estimated for the Chl containing the phytyl group correlated with K(P). Fluorescence quenching studies have shown that phorbides are located in a less hydrophobic region than the phytyl chain-containing derivatives, which are located preferentially in a deeper micellar microenvironment. Thus, the association of the chlorophylls with specific binding sites of micellar systems is strongly modulated by the presence of phytyl chains and metal coordinated to the porphyrinic ring.
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Affiliation(s)
- Adriana P Gerola
- Chemistry Department, State University of Maringá, Paraná, Brazil
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42
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Dabrowski JM, Arnaut LG, Pereira MM, Monteiro CJP, Urbańska K, Simões S, Stochel G. New halogenated water-soluble chlorin and bacteriochlorin as photostable PDT sensitizers: synthesis, spectroscopy, photophysics, and in vitro photosensitizing efficacy. ChemMedChem 2011; 5:1770-80. [PMID: 20715283 DOI: 10.1002/cmdc.201000223] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Chlorin and bacteriochlorin derivatives of 5,10,15,20-tetrakis(2-chloro-5-sulfophenyl)porphyrin have intense absorptions in the phototherapeutic window, high water solubility, high photostability, low fluorescence quantum yield, long triplet lifetimes, and high singlet oxygen quantum yields. Biological studies revealed their negligible dark cytotoxicity, yet significant photodynamic effect against A549 (human lung adenocarcinoma), MCF7 (human breast carcinoma) and SK-MEL-188 (human melanoma) cell lines upon red light irradiation (cutoff λ<600 nm) at low light doses. Time-dependent cellular accumulation of the chlorinated sulfonated chlorin reached a plateau at 2 h, as previously observed for the related porphyrin. However, the optimal incubation time for the bacteriochlorin derivative was significantly longer (12 h). The spectroscopic, photophysical, and biological properties of the compounds are discussed in relevance to their PDT activity, leading to the conclusion that the bacteriochlorin derivative is a promising candidate for future in vivo experiments.
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43
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Orzeł Ł, Kania A, Rutkowska-Zbik D, Susz A, Stochel G, Fiedor L. Structural and electronic effects in the metalation of porphyrinoids. Theory and experiment. Inorg Chem 2010; 49:7362-71. [PMID: 20690746 DOI: 10.1021/ic100466s] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The structure-reactivity relationships in metalation reactions of porphyrinoids have been studied using experimental and theoretical methods. A series of eight porphyrinoic ligands, derivatives of chlorophylls, was prepared in which both the peripheral groups and the degrees of saturation of the macrocycle were systematically varied. To reveal the solvent and structural factors which control the interactions of these macroligands with metal centers, their interactions with reactive Zn(2+) and inert Pt(2+) ions were investigated using absorption spectroscopy. In parallel, quantum chemical calculations (density functional theory, DFT) were performed for the same set of molecules to examine the influence of structural and electronic factors on the energy of the frontier orbitals, the nucleophilicity/electronegativity of the macrocycle, its hardness, and conformation. These static descriptors of chemical reactivity, relevant to metalation reactions, were verified against the results obtained in the experimental model. The experimentally obtained kinetic data clearly show that the solvent has a crucial role in the activation of the incoming metal center. In terms of chelator structure, the largest effects concern the size of the delocalized pi-electron system and the presence of side groups. Both the DFT calculations and experimental results show the strong influence of the macrocycle rigidity and of the peripheral groups on the chelating ability of porphyrinoids. In particular, the peripheral functionalization of the macrocyclic system seems to drastically reduce its reactivity toward metal ions. The effect of peripheral groups is two-fold: (i) a lower electron density on the core nitrogens, and (ii) increased rigidity of the macrocycle. The outcomes of the theoretical and experimental analyses are discussed also in terms of their relevance to the mechanism of biological metal insertion in the biosynthesis of heme and chlorophyll.
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Affiliation(s)
- Łukasz Orzeł
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland
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44
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Niedzwiedzki DM, Blankenship RE. Singlet and triplet excited state properties of natural chlorophylls and bacteriochlorophylls. PHOTOSYNTHESIS RESEARCH 2010; 106:227-238. [PMID: 21086044 DOI: 10.1007/s11120-010-9598-9] [Citation(s) in RCA: 95] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2010] [Accepted: 11/02/2010] [Indexed: 05/28/2023]
Abstract
Ten naturally occurring chlorophylls (a, b, c (2), d) and bacteriochlorophylls (a, b, c, d, e, g) were purified and studied using the optical spectroscopic techniques of both steady state and time-resolved absorption and fluorescence. The studies were carried out at room temperature in nucleophilic solvents in which the central Mg is hexacoordinated. The comprehensive studies of singlet excited state lifetimes show a clear dependency on the structural features of the macrocycle and terminal substituents. The wide-ranging studies of triplet state lifetime demonstrate the existence of an energy gap law for these molecules. The knowledge of the dynamics and the energies of the triplet state that were obtained in other studies allowed us to construct an energy gap law expression that can be used to estimate the triplet state energies of any (B)chlorophyll molecule from its triplet lifetime obtained in a liquid environment.
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Affiliation(s)
- Dariusz M Niedzwiedzki
- Department of Biology, Washington University in St. Louis, St. Louis, MO 63130-4899, USA
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45
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Janik E, Maksymiec W, Gruszecki WI. The photoprotective mechanisms in Secale cereale leaves under Cu and high light stress condition. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2010; 101:47-52. [DOI: 10.1016/j.jphotobiol.2010.06.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2010] [Revised: 06/13/2010] [Accepted: 06/21/2010] [Indexed: 11/29/2022]
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46
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Orzeł Ł, Jańczyk A, Brindell M, Stopa G, Stochel G. New trends in the application of laser flash photolysis – case studies. J COORD CHEM 2010. [DOI: 10.1080/00958972.2010.507271] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Ł. Orzeł
- a Faculty of Chemistry , Jagiellonian University , Ingardena 3, 30-060 Kraków
| | - A. Jańczyk
- a Faculty of Chemistry , Jagiellonian University , Ingardena 3, 30-060 Kraków
| | - M. Brindell
- a Faculty of Chemistry , Jagiellonian University , Ingardena 3, 30-060 Kraków
| | - G. Stopa
- a Faculty of Chemistry , Jagiellonian University , Ingardena 3, 30-060 Kraków
| | - G. Stochel
- a Faculty of Chemistry , Jagiellonian University , Ingardena 3, 30-060 Kraków
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47
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Janik E, Maksymiec W, Mazur R, Garstka M, Gruszecki WI. Structural and Functional Modifications of the Major Light-Harvesting Complex II in Cadmium- or Copper-Treated Secale cereale. ACTA ACUST UNITED AC 2010; 51:1330-40. [DOI: 10.1093/pcp/pcq093] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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48
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Olchawa M, Szewczyk G, Zareba M, Piłat A, Bzowska M, Mikołajczyk T, Sarna T. Sub-lethal photodynamic damage to ARPE-19 cells transiently inhibits their phagocytic activity. Photochem Photobiol 2010; 86:772-80. [PMID: 20492570 DOI: 10.1111/j.1751-1097.2010.00727.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Efficient phagocytosis of photoreceptor outer segments (POS) membranes by retinal pigment epithelium (RPE) plays a key role in biological renewal of these highly peroxidizable structures. Here, we tested whether photodynamic treatment, mediated by merocyanine 540 (MC 540), rose Bengal or a zinc-substituted chlorophyllide inhibited phagocytic activity of ARPE-19 cells in vitro. Specific phagocytosis of fluorescein-5-isothiocyanate-labeled POS isolated from cow retinas and nonspecific phagocytosis of fluorescent polystyrene beads were measured by flow cytometry. Photodynamic treatment, mediated by all three photosensitizers with sub-threshold doses, induced significant inhibition of the cell-specific phagocytosis. The nonspecific phagocytosis was inhibited by photodynamic treatment mediated only by MC 540. The inhibition of phagocytosis was a reversible phenomenon and after 24 h, the photodynamically treated cells exhibited phagocytic activity that was comparable with that of untreated cells. This study provides proof of principle that sub-threshold photodynamic treatment of ARPE-19 cells with appropriate photosensitizers is a convenient experimental approach for in vitro study of the effects of oxidative stress on specific phagocytic activity of RPE cells. We postulate that oxidative damage to key components of the cell phagocytic machinery may be responsible for severe impairment of its activity, which can lead to retinal degeneration.
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49
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Kaligotla S, Doyle S, Niedzwiedzki DM, Hasegawa S, Kajikawa T, Katsumura S, Frank HA. Triplet state spectra and dynamics of peridinin analogs having different extents of pi-electron conjugation. PHOTOSYNTHESIS RESEARCH 2010; 103:167-174. [PMID: 20165916 DOI: 10.1007/s11120-010-9535-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2009] [Accepted: 02/04/2010] [Indexed: 05/28/2023]
Abstract
The Peridinin-Chlorophyll a-Protein (PCP) complex has both an exceptionally efficient light-harvesting ability and a highly effective protective capacity against photodynamic reactions involving singlet oxygen. These functions can be attributed to presence of a substantial amount of the highly-substituted and complex carotenoid, peridinin, in the protein and the facts that the low-lying singlet states of peridinin are higher in energy than those of chlorophyll (Chl) a, but the lowest-lying triplet state of peridinin is below that of Chl a. Thus, singlet energy can be transferred from peridinin to Chl a, but the Chl a triplet state is quenched before it can sensitize the formation of singlet oxygen. The present investigation takes advantage of Chl a as an effective triplet state donor to peridinin and explores the triplet state spectra and dynamics of a systematic series of peridinin analogs having different numbers of conjugated carbon-carbon double bonds. The carotenoids investigated are peridinin, which has a C(37) carbon skeleton and eight conjugated carbon-carbon double bonds, and three synthetic analogs: C(33)-peridinin, having two less double bonds than peridinin, C(35)-peridinin which has one less double bond than peridinin, and C(39)-peridinin which has one more double bond than peridinin. In this study, the behavior of the triplet state spectra and kinetics exhibited by these molecules has been investigated in polar and nonpolar solvents and reveals a substantial effect of both pi-electron conjugated chain length and solvent environment on the spectral lineshapes. However, only a small dependence of these factors is observed on the kinetics of triplet energy transfer from Chl a and on carotenoid triplet state deactivation to the ground state.
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Affiliation(s)
- Shanti Kaligotla
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road, Storrs, CT 06269-3060, USA
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50
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Wagnert L, Rubin R, Berg A, Mahammed A, Gross Z, Levanon H. Photoexcited Triplet State Properties of Brominated and Nonbrominated Ga(III)-Corroles as Studied by Time-Resolved Electron Paramagnetic Resonance. J Phys Chem B 2010; 114:14303-8. [DOI: 10.1021/jp911465p] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Linn Wagnert
- Department of Physical Chemistry, Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - Roy Rubin
- Department of Physical Chemistry, Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - Alexander Berg
- Department of Physical Chemistry, Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - Atif Mahammed
- Department of Physical Chemistry, Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - Zeev Gross
- Department of Physical Chemistry, Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 32000, Israel
| | - Haim Levanon
- Department of Physical Chemistry, Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 32000, Israel
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