1
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Wang X, Kinziabulatova L, Bortoli M, Manickoth A, Barilla MA, Huang H, Blancafort L, Kohler B, Lumb JP. Indole-5,6-quinones display hallmark properties of eumelanin. Nat Chem 2023:10.1038/s41557-023-01175-4. [PMID: 37037912 DOI: 10.1038/s41557-023-01175-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 03/07/2023] [Indexed: 04/12/2023]
Abstract
Melanins are ubiquitous biopolymers produced from phenols and catechols by oxidation. They provide photoprotection, pigmentation and redox activity to most life forms, and inspire synthetic materials with desirable optical, electronic and mechanical properties. The chemical structures of melanins remain elusive, however, creating uncertainty about their roles, and preventing the design of synthetic mimics with tailored properties. Indole-5,6-quinone (IQ) has been implicated as a biosynthetic intermediate and structural subunit of mammalian eumelanin pigments, but its instability has prevented its isolation and unambiguous characterization. Here we use steric shielding to stabilize IQ and show that 'blocked' derivatives exhibit eumelanin's characteristic ultrafast nonradiative decay and its ability to absorb light from the ultraviolet to the near-infrared. These new compounds are also redox-active and a source of paramagnetism, emulating eumelanin's unique electronic properties, which include persistent radicals. Blocked IQs are atomistically precise and tailorable molecules that can offer a bottom-up understanding of emergent properties in eumelanin and have the potential to advance the rational design of melanin-inspired materials.
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Affiliation(s)
- Xueqing Wang
- Department of Chemistry, McGill University, Montreal, Quebec, Canada
| | - Lilia Kinziabulatova
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH, USA
| | - Marco Bortoli
- Institut de Química Computacional i Catàlisi, Facultat de Ciències, Universitat de Girona, Girona, Spain
| | - Anju Manickoth
- Institut de Química Computacional i Catàlisi, Facultat de Ciències, Universitat de Girona, Girona, Spain
| | - Marisa A Barilla
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH, USA
| | - Haiyan Huang
- Department of Chemistry, McGill University, Montreal, Quebec, Canada
| | - Lluís Blancafort
- Institut de Química Computacional i Catàlisi, Facultat de Ciències, Universitat de Girona, Girona, Spain.
| | - Bern Kohler
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH, USA.
| | - Jean-Philip Lumb
- Department of Chemistry, McGill University, Montreal, Quebec, Canada.
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2
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Hemmatpour H, De Luca O, Crestani D, Stuart MCA, Lasorsa A, van der Wel PCA, Loos K, Giousis T, Haddadi-Asl V, Rudolf P. New insights in polydopamine formation via surface adsorption. Nat Commun 2023; 14:664. [PMID: 36750751 PMCID: PMC9905603 DOI: 10.1038/s41467-023-36303-8] [Citation(s) in RCA: 30] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Accepted: 01/25/2023] [Indexed: 02/09/2023] Open
Abstract
Polydopamine is a biomimetic self-adherent polymer, which can be easily deposited on a wide variety of materials. Despite the rapidly increasing interest in polydopamine-based coatings, the polymerization mechanism and the key intermediate species formed during the deposition process are still controversial. Herein, we report a systematic investigation of polydopamine formation on halloysite nanotubes; the negative charge and high surface area of halloysite nanotubes favour the capture of intermediates that are involved in polydopamine formation and decelerate the kinetics of the process, to unravel the various polymerization steps. Data from X-ray photoelectron and solid-state nuclear magnetic resonance spectroscopies demonstrate that in the initial stage of polydopamine deposition, oxidative coupling reaction of the dopaminechrome molecules is the main reaction pathway that leads to formation of polycatecholamine oligomers as an intermediate and the post cyclization of the linear oligomers occurs subsequently. Furthermore, TRIS molecules are incorporated into the initially formed oligomers.
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Affiliation(s)
- Hamoon Hemmatpour
- grid.4830.f0000 0004 0407 1981Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands ,grid.411368.90000 0004 0611 6995Department of Polymer Engineering and Color Technology, Amirkabir University of Technology, P.O. Box 1587-4413, Tehran, Iran
| | - Oreste De Luca
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747AG, Groningen, The Netherlands. .,Dipartimento di Fisica, Università della Calabria, 87036, Arcavacata di Rende (Cs), Italy.
| | - Dominic Crestani
- grid.4830.f0000 0004 0407 1981Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands
| | - Marc C. A. Stuart
- grid.4830.f0000 0004 0407 1981Electron Microscopy, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Nijenborgh 7, 9747AG Groningen, The Netherlands
| | - Alessia Lasorsa
- grid.4830.f0000 0004 0407 1981Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands
| | - Patrick C. A. van der Wel
- grid.4830.f0000 0004 0407 1981Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands
| | - Katja Loos
- grid.4830.f0000 0004 0407 1981Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands
| | - Theodosis Giousis
- grid.4830.f0000 0004 0407 1981Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands ,grid.9594.10000 0001 2108 7481Department of Materials Science & Engineering, University of Ioannina, 45110 Ioannina, Greece
| | - Vahid Haddadi-Asl
- grid.411368.90000 0004 0611 6995Department of Polymer Engineering and Color Technology, Amirkabir University of Technology, P.O. Box 1587-4413, Tehran, Iran
| | - Petra Rudolf
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747AG, Groningen, The Netherlands.
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3
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The Effect of Cosmetic Ingredients of Phenol Type on Immediate Pigment Darkening and Their (Photo)Protective Action in Association with Melanin Pigmentation: A Model In Vitro Study. COSMETICS 2023. [DOI: 10.3390/cosmetics10010022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Immediate pigment darkening, the first response of skin to solar exposure leading to undesired irregular pigmentation and dark spots, is the rapid onset of melanin pigmentation resulting from oxidation of the melanogenic indoles, namely 5,6-dihydroxyindole (DHI) and 5,6-dihydroxyindole-2-carboxylic acid (DHICA) available in epidermal melanocytes. The search for effective sunscreen formulations is nowadays focused on UVA/B filters and additional ingredients that may scavenge the reactive oxygen species generated in these processes. In this work the effects of phenolic cosmetic ingredients (CIs), paradol-6, a ginger CO2 extract, and phenylethyl resorcinol on photosensitized DHI and DHICA oxidation were investigated showing a decrease of their consumption and melanin formation (25–30% decrease with phenylethyl resorcinol). The photoprotective role of CIs was also evaluated in model systems. Paradol-6 and ginger CO2 extract can halve linoleic acid peroxidation in the riboflavin-sensitized reaction, while dienes generation reduction (30% of control) was observed in the Rose-Bengal-sensitized photooxidation with paradol-6. The presence of DHI/DHICA melanin exerted a synergistic effect. The decay of thymine free or as a DNA base was almost completely inhibited by CIs. These results open new perspectives in the design of skin care formulations for ameliorating skin spots and contrasting ageing processes associated with sun exposure.
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4
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Argenziano R, Della Greca M, Panzella L, Napolitano A. A Straightforward Access to New Amides of the Melanin Precursor 5,6-Dihydroxyindole-2-carboxylic Acid and Characterization of the Properties of the Pigments Thereof. Molecules 2022; 27:4816. [PMID: 35956765 PMCID: PMC9369804 DOI: 10.3390/molecules27154816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 07/18/2022] [Accepted: 07/26/2022] [Indexed: 11/17/2022] Open
Abstract
We report herein an optimized procedure for preparation of carboxamides of 5,6-dihydroxyindole-2-carboxylic acid (DHICA), the main biosynthetic precursor of the skin photoprotective agents melanins, to get access to pigments with more favorable solubility properties with respect to the natural ones. The developed procedure was based on the use of a coupling agent (HATU/DIPEA) and required protection of the catechol function by easily removable acetyl groups. The O-acetylated compounds could be safely stored and taken to the reactive o-diphenol form just before use. Satisfactorily high yields (>85%) were obtained for all amides. The oxidative polymerization of the synthesized amides carried out in air in aqueous buffer at pH 9 afforded melanin-like pigmented materials that showed chromophores resembling those of DHICA-derived pigments, with a good covering of the UVA and the visible region, and additionally exhibited a good solubility in alcoholic solvents, a feature of great interest for the exploitation of these materials as ingredients of dermocosmetic formulations.
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Affiliation(s)
| | | | | | - Alessandra Napolitano
- Department of Chemical Sciences, University of Naples “Federico II”, Via Cintia 21, I-80126 Naples, Italy; (R.A.); (M.D.G.); (L.P.)
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5
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Mostert AB. Melanin, the What, the Why and the How: An Introductory Review for Materials Scientists Interested in Flexible and Versatile Polymers. Polymers (Basel) 2021; 13:1670. [PMID: 34065580 PMCID: PMC8161012 DOI: 10.3390/polym13101670] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2021] [Revised: 05/18/2021] [Accepted: 05/18/2021] [Indexed: 01/13/2023] Open
Abstract
Today, western society is facing challenges to create new medical technologies to service an aging population as well as the ever-increasing e-waste of electronic devices and sensors. A key solution to these challenges will be the use of biomaterials and biomimetic systems. One material that has been receiving serious attention for its biomedical and device applications is eumelanin. Eumelanin, or commonly known as melanin, is nature's brown-black pigment and is a poly-indolequinone biopolymer, which possess unique physical and chemical properties for material applications. Presented here is a review, aimed at polymer and other materials scientists, to introduce eumelanin as a potential material for research. Covered here are the chemical and physical structures of melanin, an overview of its unique physical and chemical properties, as well as a wide array of applications, but with an emphasis on device and sensing applications. The review is then finished by introducing interested readers to novel synthetic protocols and post synthesis fabrication techniques to enable a starting point for polymer research in this intriguing and complex material.
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Affiliation(s)
- A Bernardus Mostert
- Department of Chemistry, Swansea University, Singleton Park, Wales SA2 8PP, UK
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6
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Jarenmark M, Sjövall P, Ito S, Wakamatsu K, Lindgren J. Chemical Evaluation of Eumelanin Maturation by ToF-SIMS and Alkaline Peroxide Oxidation HPLC Analysis. Int J Mol Sci 2020; 22:ijms22010161. [PMID: 33375233 PMCID: PMC7796430 DOI: 10.3390/ijms22010161] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 12/08/2020] [Accepted: 12/18/2020] [Indexed: 01/29/2023] Open
Abstract
Residual melanins have been detected in multimillion-year-old animal body fossils; however, confident identification and characterization of these natural pigments remain challenging due to loss of chemical signatures during diagenesis. Here, we simulate this post-burial process through artificial maturation experiments using three synthetic and one natural eumelanin exposed to mild (100 °C/100 bar) and harsh (250 °C/200 bar) environmental conditions, followed by chemical analysis employing alkaline hydrogen peroxide oxidation (AHPO) and time-of-flight secondary ion mass spectrometry (ToF-SIMS). Our results show that AHPO is sensitive to changes in the melanin molecular structure already during mild heat and pressure treatment (resulting, e.g., in increased C-C cross-linking), whereas harsh maturation leads to extensive loss of eumelanin-specific chemical markers. In contrast, negative-ion ToF-SIMS spectra are considerably less affected by mild maturation conditions, and eumelanin-specific features remain even after harsh treatment. Detailed analysis of ToF-SIMS spectra acquired prior to experimental treatment revealed significant differences between the investigated eumelanins. However, systematic spectral changes upon maturation reduced these dissimilarities, indicating that intense heat and pressure treatment leads to the formation of a common, partially degraded, eumelanin molecular structure. Our findings elucidate the complementary nature of AHPO and ToF-SIMS during chemical characterization of eumelanin traces in fossilized organismal remains.
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Affiliation(s)
- Martin Jarenmark
- Department of Geology, Lund University, 223 62 Lund, Sweden;
- Correspondence: (M.J.); (P.S.)
| | - Peter Sjövall
- The Materials and Production Division, RISE Research Institutes of Sweden, 501 15 Borås, Sweden
- Correspondence: (M.J.); (P.S.)
| | - Shosuke Ito
- Institute for Melanin Chemistry, Fujita Health University, Toyoake, Aichi 470-1192, Japan; (S.I.); (K.W.)
| | - Kazumasa Wakamatsu
- Institute for Melanin Chemistry, Fujita Health University, Toyoake, Aichi 470-1192, Japan; (S.I.); (K.W.)
| | - Johan Lindgren
- Department of Geology, Lund University, 223 62 Lund, Sweden;
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7
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Huang M, Li W, Liu X, Feng M, Yang J. Study on structure and performance of surface‐metallized carbon fibers reinforced rigid polyurethane composites. POLYM ADVAN TECHNOL 2020. [DOI: 10.1002/pat.4907] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Momo Huang
- Ningbo Key Laboratory of Specialty Polymers, Faculty of Materials Science and Chemical EngineeringNingbo University Ningbo China
| | - Weiwei Li
- Ningbo Key Laboratory of Specialty Polymers, Faculty of Materials Science and Chemical EngineeringNingbo University Ningbo China
| | - Xiaojing Liu
- Ningbo Key Laboratory of Specialty Polymers, Faculty of Materials Science and Chemical EngineeringNingbo University Ningbo China
| | - Ming Feng
- Ningbo Key Laboratory of Specialty Polymers, Faculty of Materials Science and Chemical EngineeringNingbo University Ningbo China
| | - Jie Yang
- Ningbo Key Laboratory of Specialty Polymers, Faculty of Materials Science and Chemical EngineeringNingbo University Ningbo China
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8
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Xu R, Soavi F, Santato C. An Electrochemical Study on the Effect of Metal Chelation and Reactive Oxygen Species on a Synthetic Neuromelanin Model. Front Bioeng Biotechnol 2019; 7:227. [PMID: 31681735 PMCID: PMC6813213 DOI: 10.3389/fbioe.2019.00227] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2019] [Accepted: 09/05/2019] [Indexed: 11/13/2022] Open
Abstract
Neuromelanin is present in the cathecolaminergic neuron cells of the substantia nigra and locus coeruleus of the midbrain of primates. Neuromelanin plays a role in Parkinson's disease (PD). Literature reports that neuromelanin features, among others, antioxidant properties by metal ion chelation and free radical scavenging. The pigment has been reported to have prooxidant properties too, in certain experimental conditions. We propose an explorative electrochemical study of the effect of the presence of metal ions and reactive oxygen species (ROS) on the cyclic voltammograms of a synthetic model of neuromelanin. Our work improves the current understanding on experimental conditions where neuromelanin plays an antioxidant or prooxidant behavior, thus possibly contributing to shed light on factors promoting the appearance of PD.
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Affiliation(s)
- Ri Xu
- Department of Engineering Physics, Polytechnique Montréal, Montréal, QC, Canada
| | - Francesca Soavi
- Dipartimento di Chimica "Giacomo Ciamician", Alma Mater Studiorum Università di Bologna, Bologna, Italy
| | - Clara Santato
- Department of Engineering Physics, Polytechnique Montréal, Montréal, QC, Canada
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9
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Xu R, Gouda A, Caso MF, Soavi F, Santato C. Melanin: A Greener Route To Enhance Energy Storage under Solar Light. ACS OMEGA 2019; 4:12244-12251. [PMID: 31460340 PMCID: PMC6682057 DOI: 10.1021/acsomega.9b01039] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Accepted: 07/03/2019] [Indexed: 05/28/2023]
Abstract
The development of technologies integrating solar energy conversion and energy storage functions is critical for limiting the anthropogenic effects on climate change and preventing possible energy shortages related to the increase of the world population. In our work, we explored the possibility to integrate the conversion and storage functions within the same multifunctional biosourced material. We identified the redox-active, quinone-based, melanin pigment, featuring a broadband absorption in the UV-vis region, as the ideal candidate for such an exploration. Electrodes of melanin on carbon paper were investigated for their morphological, optical, and voltammetric characteristics prior to being assembled into symmetric supercapacitors operating in aqueous electrolytes. We observed that, under solar light, the capacity and capacitance of melanin electrodes significantly increase with respect to the dark conditions (by 22 and 39%, respectively). Once in a supercapacitor configuration, besides featuring a Coulombic efficiency close to 100% after 5000 cycles, the capacitance and capacity of the electrodes, rated by the initial values, improve after prolonged illumination, as it is the case for the energy and power density.
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Affiliation(s)
- Ri Xu
- Department
of Engineering Physics, Polytechnique Montréal, C.P. 6079, Succursale Centre-ville, Montréal, QC H3C 3A7, Canada
| | - Abdelaziz Gouda
- Department
of Engineering Physics, Polytechnique Montréal, C.P. 6079, Succursale Centre-ville, Montréal, QC H3C 3A7, Canada
| | - Maria Federica Caso
- Nanofaber
Spin-Off at ENEA, Casaccia Research Centre, Via Anguillarese 301, Roma 00123, Italy
| | - Francesca Soavi
- Dipartimento
di Chimica “Giacomo Ciamician”, Alma Mater Studiorum Università di Bologna, Via Selmi, 2, 40126 Bologna, Italy
| | - Clara Santato
- Department
of Engineering Physics, Polytechnique Montréal, C.P. 6079, Succursale Centre-ville, Montréal, QC H3C 3A7, Canada
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10
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Wakamatsu K, Nakao K, Tanaka H, Kitahori Y, Tanaka Y, Ojika M, Ito S. The Oxidative Pathway to Dopamine-Protein Conjugates and Their Pro-Oxidant Activities: Implications for the Neurodegeneration of Parkinson's Disease. Int J Mol Sci 2019; 20:ijms20102575. [PMID: 31130632 PMCID: PMC6567298 DOI: 10.3390/ijms20102575] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Revised: 05/22/2019] [Accepted: 05/23/2019] [Indexed: 12/23/2022] Open
Abstract
Neuromelanin (NM) is a dark brown pigment found in dopaminergic neurons of the substantia nigra (SN) and in norepinephrinergic neurons of the locus coeruleus (LC). Although NM is thought to be involved in the etiology of Parkinson's disease (PD) because its content decreases in neurodegenerative diseases such as PD, details are still unknown. In this study, we characterized the biosynthetic pathway of the oxidation of dopamine (DA) by tyrosinase in the presence of thiol peptides and proteins using spectroscopic and high-performance liquid chromatography (HPLC) methods and we assessed the binding of DA via cysteine residues in proteins by oxidation catalyzed by redox-active metal ions. To examine whether the protein-bound DA conjugates exhibit pro-oxidant activities, we measured the depletion of glutathione (GSH) with the concomitant production of hydrogen peroxide. The results suggest that the fate of protein-bound DA conjugates depends on the structural features of the proteins and that DA-protein conjugates produced in the brain possess pro-oxidant activities, which may cause neurodegeneration due to the generation of reactive oxygen species (ROS) and the depletion of antioxidants.
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Affiliation(s)
- Kazumasa Wakamatsu
- Department of Chemistry, Fujita Health University School of Medical Sciences, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi 470-1192, Japan.
| | - Kenta Nakao
- Department of Chemistry, Fujita Health University School of Medical Sciences, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi 470-1192, Japan.
| | - Hitomi Tanaka
- Department of Chemistry, Fujita Health University School of Medical Sciences, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi 470-1192, Japan.
| | - Yuki Kitahori
- Department of Chemistry, Fujita Health University School of Medical Sciences, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi 470-1192, Japan.
| | - Yui Tanaka
- Department of Chemistry, Fujita Health University School of Medical Sciences, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi 470-1192, Japan.
| | - Makoto Ojika
- Department of Applied Biosciences, Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa-ku, Nagoya 464-8601, Japan.
| | - Shosuke Ito
- Department of Chemistry, Fujita Health University School of Medical Sciences, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi 470-1192, Japan.
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11
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Lyu Q, Hsueh N, Chai CLL. The Chemistry of Bioinspired Catechol(amine)-Based Coatings. ACS Biomater Sci Eng 2019; 5:2708-2724. [DOI: 10.1021/acsbiomaterials.9b00281] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Qinghua Lyu
- Department of Pharmacy, National University of Singapore, 18 Science Drive 4, Singapore 117543
| | - Nathanael Hsueh
- Department of Pharmacy, National University of Singapore, 18 Science Drive 4, Singapore 117543
| | - Christina L. L. Chai
- Department of Pharmacy, National University of Singapore, 18 Science Drive 4, Singapore 117543
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12
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Bruning JM, Wang Y, Oltrabella F, Tian B, Kholodar SA, Liu H, Bhattacharya P, Guo S, Holton JM, Fletterick RJ, Jacobson MP, England PM. Covalent Modification and Regulation of the Nuclear Receptor Nurr1 by a Dopamine Metabolite. Cell Chem Biol 2019; 26:674-685.e6. [PMID: 30853418 PMCID: PMC7185887 DOI: 10.1016/j.chembiol.2019.02.002] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Revised: 11/06/2018] [Accepted: 01/31/2019] [Indexed: 12/20/2022]
Abstract
Nurr1, a nuclear receptor essential for the development, maintenance, and survival of midbrain dopaminergic neurons, is a potential therapeutic target for Parkinson's disease, a neurological disorder characterized by the degeneration of these same neurons. Efforts to identify Nurr1 agonists have been hampered by the recognition that it lacks several classic regulatory elements of nuclear receptor function, including the canonical ligand-binding pocket. Here we report that the dopamine metabolite 5,6-dihydroxyindole (DHI) binds directly to and modulates the activity of Nurr1. Using biophysical assays and X-ray crystallography, we show that DHI binds to the ligand-binding domain within a non-canonical pocket, forming a covalent adduct with Cys566. In cultured cells and zebrafish, DHI stimulates Nurr1 activity, including the transcription of target genes underlying dopamine homeostasis. These findings suggest avenues for developing synthetic Nurr1 ligands to ameliorate the symptoms and progression of Parkinson's disease.
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Affiliation(s)
- John M Bruning
- Pharmaceutical Sciences and Pharmacogenomics Graduate Program, University of California San Francisco, San Francisco, CA 94158, USA
| | - Yan Wang
- Department of Pharmaceutical Chemistry, University of California San Francisco, San Francisco, CA 94158, USA
| | - Francesca Oltrabella
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA 94158, USA
| | - Boxue Tian
- Department of Pharmaceutical Chemistry, University of California San Francisco, San Francisco, CA 94158, USA
| | - Svetlana A Kholodar
- Department of Pharmaceutical Chemistry, University of California San Francisco, San Francisco, CA 94158, USA
| | - Harrison Liu
- Bioengineering Graduate Program, University of California San Francisco, San Francisco, CA 94158, USA
| | - Paulomi Bhattacharya
- Department of Pharmaceutical Chemistry, University of California San Francisco, San Francisco, CA 94158, USA
| | - Su Guo
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA 94158, USA
| | - James M Holton
- Department of Biochemistry and Biophysics, University of California San Francisco, San Francisco, CA 94158, USA
| | - Robert J Fletterick
- Department of Biochemistry and Biophysics, University of California San Francisco, San Francisco, CA 94158, USA
| | - Matthew P Jacobson
- Department of Pharmaceutical Chemistry, University of California San Francisco, San Francisco, CA 94158, USA; Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA 94158, USA
| | - Pamela M England
- Department of Pharmaceutical Chemistry, University of California San Francisco, San Francisco, CA 94158, USA; Department of Cellular and Molecular Pharmacology, University of California San Francisco, San Francisco, CA 94158, USA.
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13
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Ma H, Fan Q, Fan B, Zhang Y, Fan D, Wu D, Wei Q. Formation of Homogeneous Epinephrine-Melanin Solutions to Fabricate Electrodes for Enhanced Photoelectrochemical Biosensing. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:7744-7750. [PMID: 29884025 DOI: 10.1021/acs.langmuir.8b00264] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The development of a simple but effective surface modification method is very important for the construction of biosensing interfaces. In this work, a postsynthetic water-soluble epinephrine-melanin (EPM) prepared from the self-polymerization of epinephrine has been demonstrated as an alternative of the widely used in situ formed polydopamine (PDA) for the surface coating of TiO2 nanoparticles and the construction of a photoelectrochemical (PEC) biosensing interface. In contrast to the formation of insoluble aggregates in solution for dopamine, a homogeneous solution was obtained for epinephrine after the self-polymerization. The use of EPM as a postsynthetic material enables the surface coating of TiO2 with the simple drop-casting method. Compared with the widely used dip-coating method for in situ PDA modification, the developed drop-casting method based on the use of water-soluble postsynthetic EPM saves more time, avoids the waste of bulk solution, and undoubtedly decreases the batch-to-batch inconsistencies. The simple coating of commercially available TiO2 nanoparticles with EPM greatly enhances the PEC performance due to the charge transfer property of EPM. The application of EPM in the construction of the PEC biosensing interface was demonstrated by the immobilization of a model biorecognition element (prostate specific antigen (PSA) antibody) onto EPM modified indium tin oxide (ITO) photoanode. Sensitive detection of PSA with high selectivity and stability was obtained on the basis of the biological recognition ability of PSA antibody. This work may renew the use of postsynthetic melanin-like biopolymers in other fields.
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Affiliation(s)
- Hongmin Ma
- Key Laboratory of Interfacial Reaction and Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering , University of Jinan , Jinan , 250022 , China
| | - Qi Fan
- Key Laboratory of Interfacial Reaction and Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering , University of Jinan , Jinan , 250022 , China
| | - Bobo Fan
- Key Laboratory of Interfacial Reaction and Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering , University of Jinan , Jinan , 250022 , China
| | - Yong Zhang
- Key Laboratory of Interfacial Reaction and Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering , University of Jinan , Jinan , 250022 , China
| | - Dawei Fan
- Key Laboratory of Interfacial Reaction and Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering , University of Jinan , Jinan , 250022 , China
| | - Dan Wu
- Key Laboratory of Interfacial Reaction and Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering , University of Jinan , Jinan , 250022 , China
| | - Qin Wei
- Key Laboratory of Interfacial Reaction and Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering , University of Jinan , Jinan , 250022 , China
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14
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Panzella L, Ebato A, Napolitano A, Koike K. The Late Stages of Melanogenesis: Exploring the Chemical Facets and the Application Opportunities. Int J Mol Sci 2018; 19:E1753. [PMID: 29899264 PMCID: PMC6032422 DOI: 10.3390/ijms19061753] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2018] [Revised: 06/08/2018] [Accepted: 06/08/2018] [Indexed: 11/16/2022] Open
Abstract
In the last decade, the late stages of melanin biosynthesis involving the oxidative polymerization of 5,6-dihydroxyindole (DHI) and 5,6-dihydroxyindole-2-carboxylic acid (DHICA) have been extensively investigated. Most of the information derived from a biomimetic approach in which the oxidation of melanogenic indoles was carried out under conditions mimicking those occurring in the biological environment. Characterization of the early oligomers allowed for drawing a structural picture of DHI and DHICA melanins, providing also an interpretative basis for the different properties exhibited by these pigments, e.g., the chromophore and the antioxidant ability. The improved knowledge has opened new perspectives toward the exploitation of the unique chemistry of melanins and its precursors in cosmetic and health care applications. A noticeable example is the development of an innovative hair dyeing system that is based on the marked ease of DHI to give rise to black melanin on air oxidation under slightly alkaline conditions. The advantage of this method for a step-wise coverage of gray hair with a natural shade pigmentation on repeated treatment with a DHI-based formulation with respect to traditional dyes is presented. A variant of DHICA melanin combining solubility in water-miscible organic solvents, an intense chromophore in the UltraViolet-A UV-A region, and a marked antioxidant potency was evaluated as an ingredient for cosmetic formulations.
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Affiliation(s)
- Lucia Panzella
- Department of Chemical Sciences, University of Naples "Federico II", I-80126 Naples, Italy.
| | - Atsuko Ebato
- Hair Care Products Research Laboratories, Kao Corporation, Tokyo 131-8501, Japan.
| | - Alessandra Napolitano
- Department of Chemical Sciences, University of Naples "Federico II", I-80126 Naples, Italy.
| | - Kenzo Koike
- Hair Care Products Research Laboratories, Kao Corporation, Tokyo 131-8501, Japan.
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15
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Taira N, Katsuyama Y, Yoshioka M, Muraoka O, Morikawa T. Structural Requirements of Alkylglyceryl-l-Ascorbic Acid Derivatives for Melanogenesis Inhibitory Activity. Int J Mol Sci 2018; 19:ijms19041144. [PMID: 29642633 PMCID: PMC5979531 DOI: 10.3390/ijms19041144] [Citation(s) in RCA: 8] [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: 01/23/2018] [Revised: 04/02/2018] [Accepted: 04/06/2018] [Indexed: 12/16/2022] Open
Abstract
l-Ascorbic acid has multifunctional benefits on skin aesthetics, including inhibition of melanin production, and is widely used in cosmetics. It, however, has low stability and poor skin penetration. We hypothesize that alkylglyceryl-l-ascorbic acid derivatives, highly stable vitamin C–alkylglycerol conjugates, would have similar anti-melanogenic activity with better stability and penetration. We test 28 alkylglyceryl-l-ascorbic acid derivatives (1–28) on theophylline-stimulated B16 melanoma 4A5 cells to determine if they inhibit melanogenesis and establish any structure–function relationships. Although not the most potent inhibitors, 3-O-(2,3-dihydroxypropyl)-2-O-hexyl-l-ascorbic acid (6, IC50 = 81.4 µM) and 2-O-(2,3-dihydroxypropyl)-3-O-hexyl-l-ascorbic acid (20, IC50 = 117 µM) are deemed the best candidate derivatives based on their inhibitory activities and low toxicities. These derivatives are also found to be more stable than l-ascorbic acid and to have favorable characteristics for skin penetration. The following structural requirements for inhibitory activity of alkylglyceryl-l-ascorbic acid derivatives are also determined: (i) alkylation of glyceryl-l-ascorbic acid is essential for inhibitory activity; (ii) the 3-O-alkyl-derivatives (2–14) exhibit stronger inhibitory activity than the corresponding 2-O-alkyl-derivatives (16–28); and (iii) derivatives with longer alkyl chains have stronger inhibitory activities. Mechanistically, our studies suggest that l-ascorbic acid derivatives exert their effects by suppressing the mRNA expression of tyrosinase and tyrosine-related protein-1.
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Affiliation(s)
- Norihisa Taira
- SEIWA KASEI CO, LTD., 1-2-14, Nunoichicho, Higashi-osaka, Osaka 579-8004, Japan.
- Pharmaceutical Research and Technology Institute, Kindai University, 3-4-1 Kowakae, Higashi-osaka, Osaka 577-8502, Japan.
| | - Yushi Katsuyama
- SEIWA KASEI CO, LTD., 1-2-14, Nunoichicho, Higashi-osaka, Osaka 579-8004, Japan.
| | - Masato Yoshioka
- SEIWA KASEI CO, LTD., 1-2-14, Nunoichicho, Higashi-osaka, Osaka 579-8004, Japan.
| | - Osamu Muraoka
- Pharmaceutical Research and Technology Institute, Kindai University, 3-4-1 Kowakae, Higashi-osaka, Osaka 577-8502, Japan.
- Antiaging Center, Kindai University, 3-4-1 Kowakae, Higashi-osaka, Osaka 577-8502, Japan.
| | - Toshio Morikawa
- Pharmaceutical Research and Technology Institute, Kindai University, 3-4-1 Kowakae, Higashi-osaka, Osaka 577-8502, Japan.
- Antiaging Center, Kindai University, 3-4-1 Kowakae, Higashi-osaka, Osaka 577-8502, Japan.
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16
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Mondal S, Thampi A, Puranik M. Kinetics of Melanin Polymerization during Enzymatic and Nonenzymatic Oxidation. J Phys Chem B 2018; 122:2047-2063. [PMID: 29364665 DOI: 10.1021/acs.jpcb.7b07941] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Melanin is an abundant biopigment in the animal kingdom, but its structure remains poorly understood. This is a substantial impediment to understanding the mechanistic origin of its observed functions. Proposed models of melanin structure include aggregates of both linear and macrocyclic units and noncovalently held monomers. Both models are broadly in agreement with current experimental data. To constrain the structural and kinetic models of melanin, experimental data of high resolution with chemical specificity accompanied by atomistic modeling are required. We have addressed this by obtaining electronic absorption, infrared, and ultraviolet resonance Raman (RR) spectra of melanin at several wavelengths of excitation that are sensitive to small changes in structure. From these experiments, we observed kinetics of the formation of different species en route to melanin polymerization. Exclusive chemical signatures of monomer 3,4-dihydroxyphenylalanine (dopa), intermediate dopachrome (DC), and early-time polymer are established through their vibrational bands at 1292, 1670, and 1616 cm-1 respectively. Direct evidence of reduced heterogeneity of melanin oligomers in tyrosinase-induced formation is provided from experimental measurements of vibrational bandwidths. Models made with density functional theory show that the linear homopolymeric structures of 5,6-dihydroxyindole can account for experimentally observed wavenumbers and broad bandwidth in Raman spectra of dopa-melanin. We capture resonance Raman (RR) signature of DC, the intermediate stabilized by the enzyme tyrosinase, for the first time in an enzyme-assisted melanization reaction using 488 nm excitation wavelength and propose that this wavelength can be used to probe reaction intermediates of melanin formation in solution.
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Affiliation(s)
- Sayan Mondal
- Indian Institute of Science Education and Research , Pune 411008, India
| | - Arya Thampi
- Indian Institute of Science Education and Research , Pune 411008, India
| | - Mrinalini Puranik
- Indian Institute of Science Education and Research , Pune 411008, India
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17
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Ambrico M, Ambrico PF, Ligonzo T, Cardone A, Bridelli MG, Casamassima G, Manini P, d'Ischia M. Hydration-controlled anisotropic and giant permittivity in TEG-functionalized eumelanin. Phys Chem Chem Phys 2017; 19:9432-9443. [PMID: 28332659 DOI: 10.1039/c6cp08643h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Although it has long been known that the peculiar electronic-ionic conductor behavior of eumelanin is critically dependent on hydration, the detailed mechanisms by which water-polymer interactions control and affect the conduction properties have remained largely obscure. In this paper, we report a remarkable anisotropy and giant polarization effect in a synthetic eumelanin (TEGMe) chemically functionalized with hydrophilic TEG residues. FT-IR analyses of water sorption isotherms and AC measurements were consistent with a microporous structure binding or hosting mainly isolated water molecules. In contrast, similar experiments on a commercial synthetic eumelanin (AMe) used as a reference were suggestive of a bulk macroporous scaffold binding or hosting liquid water. These data disclosed for the first time the differential impact on eumelanin conductivity of vapor, liquid and ice-like forms of water adsorbed onto or embedded into the polymer layer. It is thus demonstrated, for the first time, that hydration controls the conduction properties of eumelanin in a more complex manner than is commonly believed, involving, besides the reported semiquinone comproportionation equilibria, the mode of interaction of water molecules as governed by both the chemical and morphological features of the polymer.
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Affiliation(s)
- Marianna Ambrico
- CNR-Istituto di Nanotecnologia Via Amendola 122/D, I-70126 Bari, Italy.
| | - Paolo F Ambrico
- CNR-Istituto di Nanotecnologia Via Amendola 122/D, I-70126 Bari, Italy.
| | - Teresa Ligonzo
- Dipartimento Interateneo di Fisica, Universita' degli Studi di Bari, Via Orabona 4, I-70126 Bari, Italy
| | - Antonio Cardone
- Istituto di Chimica dei Composti Organometallici-ICCOM, Consiglio Nazionale delle Ricerche-CNR, Via Orabona 4, I-70126, Bari, Italy
| | - Maria Grazia Bridelli
- Dipartimento di Fisica e Scienze della Terra, Università degli Studi di Parma, Parco Area delle Scienze 7/A, 43124 Parma, Italy
| | - Giuseppe Casamassima
- Dipartimento Interateneo di Fisica, Universita' degli Studi di Bari, Via Orabona 4, I-70126 Bari, Italy
| | - Paola Manini
- Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Via Cintia 4, I-80126 Naples, Italy
| | - Marco d'Ischia
- Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Via Cintia 4, I-80126 Naples, Italy
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18
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Klosterman L, Bettinger CJ. Calcium-Mediated Control of Polydopamine Film Oxidation and Iron Chelation. Int J Mol Sci 2016; 18:E14. [PMID: 28025498 PMCID: PMC5297649 DOI: 10.3390/ijms18010014] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Revised: 12/15/2016] [Accepted: 12/19/2016] [Indexed: 11/17/2022] Open
Abstract
The facile preparation of conformal polydopamine (PDA) films on broad classes of materials has prompted extensive research into a wide variety of potential applications for PDA. The constituent molecular species in PDA exhibit diverse chemical moieties, and therefore highly variable properties of PDA-based devices may evolve with post-processing conditions. Here we report the use of redox-inactive cations for oxidative post-processing of deposited PDA films. PDA films incubated in alkaline CaCl₂ solutions exhibit accelerated oxidative evolution in a dose-dependent manner. PDA films incubated in CaCl₂ solutions exhibit 53% of the oxidative charge transfer compared to pristine PDA films. Carboxylic acid groups generated from the oxidation process lower the isoelectric point of PDA films from pH = 4.0 ± 0.2 to pH = 3.1 ± 0.3. PDA films exposed to CaCl₂ solutions during post-processing also enhance Fe2+/Fe3+ chelation compared to pristine PDA films. These data illustrate that the molecular heterogeneity and non-equilibrium character of as-deposited PDA films afford control over the final composition by choosing post-processing conditions, but also demands forethought into how the performance of PDA-incorporated devices may change over time in salt solutions.
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Affiliation(s)
- Luke Klosterman
- Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
| | - Christopher J Bettinger
- Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
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19
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Green Synthesis of Silver Nanoparticles Stabilized with Mussel-Inspired Protein and Colorimetric Sensing of Lead(II) and Copper(II) Ions. Int J Mol Sci 2016; 17:ijms17122006. [PMID: 27916894 PMCID: PMC5187806 DOI: 10.3390/ijms17122006] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Revised: 11/23/2016] [Accepted: 11/25/2016] [Indexed: 02/04/2023] Open
Abstract
This articles reports a simple and green method for preparing uniform silver nanoparticles (AgNPs), for which self-polymerized 3,4-dihydroxy-l-phenylalanine (polyDOPA) is used as the reducing and stabilizing agent in aqueous media. The AgNPs functionalized by polyDOPA were analyzed by UV-Vis spectroscopy, high-resolution transmission electron microscopy (HR-TEM), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), Raman spectrophotometry, and X-ray diffraction (XRD) techniques. The results revealed that the polyDOPA-AgNPs with diameters of 25 nm were well dispersed due to the polyDOPA. It was noted that the polyDOPA-AgNPs showed selectivity for Pb2+ and Cu2+ detection with the detection limits for the two ions as low as 9.4 × 10-5 and 8.1 × 10-5 μM, respectively. Therefore, the polyDOPA-AgNPs can be applied to both Pb2+ and Cu2+ detection in real water samples. The proposed method will be useful for colorimetric detection of heavy metal ions in aqueous media.
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20
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"Fifty Shades" of Black and Red or How Carboxyl Groups Fine Tune Eumelanin and Pheomelanin Properties. Int J Mol Sci 2016; 17:ijms17050746. [PMID: 27196900 PMCID: PMC4881568 DOI: 10.3390/ijms17050746] [Citation(s) in RCA: 80] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Revised: 05/02/2016] [Accepted: 05/05/2016] [Indexed: 01/09/2023] Open
Abstract
Recent advances in the chemistry of melanins have begun to disclose a number of important structure-property-function relationships of crucial relevance to the biological role of human pigments, including skin (photo) protection and UV-susceptibility. Even slight variations in the monomer composition of black eumelanins and red pheomelanins have been shown to determine significant differences in light absorption, antioxidant, paramagnetic and redox behavior, particle morphology, surface properties, metal chelation and resistance to photo-oxidative wear-and-tear. These variations are primarily governed by the extent of decarboxylation at critical branching points of the eumelanin and pheomelanin pathways, namely the rearrangement of dopachrome to 5,6-dihydroxyindole (DHI) and 5,6-dihydroxyindole-2-carboxylic acid (DHICA), and the rearrangement of 5-S-cysteinyldopa o-quinoneimine to 1,4-benzothiazine (BTZ) and its 3-carboxylic acid (BTZCA). In eumelanins, the DHICA-to-DHI ratio markedly affects the overall antioxidant and paramagnetic properties of the resulting pigments. In particular, a higher content in DHICA decreases visible light absorption and paramagnetic response relative to DHI-based melanins, but markedly enhances antioxidant properties. In pheomelanins, likewise, BTZCA-related units, prevalently formed in the presence of zinc ions, appear to confer pronounced visible and ultraviolet A (UVA) absorption features, accounting for light-dependent reactive oxygen species (ROS) production, whereas non-carboxylated benzothiazine intermediates seem to be more effective in inducing ROS production by redox cycling mechanisms in the dark. The possible biological and functional significance of carboxyl retention in the eumelanin and pheomelanin pathways is discussed.
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21
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Guo T, Han SL, Liu YC, Liu Y, Liu HM. Convenient synthesis of antiproliferative 2,3-dihydro-2,3′-bisindoles via dimerization of N -H indole derivatives. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.01.093] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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22
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Manini P, Criscuolo V, Ricciotti L, Pezzella A, Barra M, Cassinese A, Crescenzi O, Maglione MG, Tassini P, Minarini C, Barone V, d'Ischia M. Melanin-Inspired Organic Electronics: Electroluminescence in Asymmetric Triazatruxenes. Chempluschem 2015; 80:919-927. [PMID: 31973255 DOI: 10.1002/cplu.201402444] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Indexed: 11/08/2022]
Abstract
The oxidative polymerization of 5,6-dihydroxyindoles and related hydroxyindoles at pH<3 is diverted from the usual eumelanin-forming pathway to produce mixtures of symmetric and asymmetric triazatruxenes (TATs), which could be separated and characterized for their opto-electronic properties with the aid of TD-DFT calculations. Data showed that the asymmetric isomers exhibit higher fluorescence quantum efficiencies, lower HOMO-LUMO gaps, better film homogeneity, and a more definite aggregation behavior than the symmetric counterparts, suggesting promising applications in organic electronics. The enhanced luminance exhibited by the OLED devices fabricated with blends of the synthesized TATs in poly-9-vinylcarbazole confirmed the potential of the asymmetric skeleton as new versatile platform for light-emitting materials.
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Affiliation(s)
- Paola Manini
- Department of Chemical Sciences, University of Naples Federico II, Complesso Universitario Monte S. Angelo via Cintia 4, 80126 Naples (Italy), Fax: (+39) 081674393
| | - Valeria Criscuolo
- Department of Chemical Sciences, University of Naples Federico II, Complesso Universitario Monte S. Angelo via Cintia 4, 80126 Naples (Italy), Fax: (+39) 081674393.,Laboratory of Nanomaterials and Devices, ENEA C.R. Portici, Piazzale E. Fermi 1, 80055 Portici, Naples (Italy)
| | - Laura Ricciotti
- Department of Technology, University Parthenope of Naples, Centro Direzionale Isola C4, 80143 Naples (Italy)
| | - Alessandro Pezzella
- Department of Chemical Sciences, University of Naples Federico II, Complesso Universitario Monte S. Angelo via Cintia 4, 80126 Naples (Italy), Fax: (+39) 081674393
| | - Mario Barra
- CNR-SPIN and Dept. of Physics, University of Naples Federico II, Piazzale Tecchio 80, 80125 Naples (Italy)
| | - Antonio Cassinese
- CNR-SPIN and Dept. of Physics, University of Naples Federico II, Piazzale Tecchio 80, 80125 Naples (Italy)
| | - Orlando Crescenzi
- Department of Chemical Sciences, University of Naples Federico II, Complesso Universitario Monte S. Angelo via Cintia 4, 80126 Naples (Italy), Fax: (+39) 081674393
| | - Maria Grazia Maglione
- Laboratory of Nanomaterials and Devices, ENEA C.R. Portici, Piazzale E. Fermi 1, 80055 Portici, Naples (Italy)
| | - Paolo Tassini
- Laboratory of Nanomaterials and Devices, ENEA C.R. Portici, Piazzale E. Fermi 1, 80055 Portici, Naples (Italy)
| | - Carla Minarini
- Laboratory of Nanomaterials and Devices, ENEA C.R. Portici, Piazzale E. Fermi 1, 80055 Portici, Naples (Italy)
| | - Vincenzo Barone
- Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa (Italy)
| | - Marco d'Ischia
- Department of Chemical Sciences, University of Naples Federico II, Complesso Universitario Monte S. Angelo via Cintia 4, 80126 Naples (Italy), Fax: (+39) 081674393
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23
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Prampolini G, Cacelli I, Ferretti A. Intermolecular interactions in eumelanins: a computational bottom-up approach. I. small building blocks. RSC Adv 2015. [DOI: 10.1039/c5ra03773e] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Building eumelanin: from basic units to spectral properties.
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Affiliation(s)
- Giacomo Prampolini
- Istituto di Chimica dei Composti OrganoMetallici (ICCOM-CNR)
- Area della Ricerca
- I-56124 Pisa
- Italy
| | - Ivo Cacelli
- Istituto di Chimica dei Composti OrganoMetallici (ICCOM-CNR)
- Area della Ricerca
- I-56124 Pisa
- Italy
- Dipartimento di Chimica e Chimica Industriale
| | - Alessandro Ferretti
- Istituto di Chimica dei Composti OrganoMetallici (ICCOM-CNR)
- Area della Ricerca
- I-56124 Pisa
- Italy
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24
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Quignard S, d'Ischia M, Chen Y, Fattaccioli J. Ultraviolet-Induced Fluorescence of Polydopamine-Coated Emulsion Droplets. Chempluschem 2014. [DOI: 10.1002/cplu.201402157] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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25
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Liu Y, Ai K, Lu L. Polydopamine and Its Derivative Materials: Synthesis and Promising Applications in Energy, Environmental, and Biomedical Fields. Chem Rev 2014; 114:5057-115. [DOI: 10.1021/cr400407a] [Citation(s) in RCA: 3219] [Impact Index Per Article: 321.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Yanlan Liu
- State
Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
- Chinese Academy of Sciences, Beijing 100039, People’s Republic of China
| | - Kelong Ai
- State
Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
| | - Lehui Lu
- State
Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
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26
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Prasetyanto EA, Manini P, Napolitano A, Crescenzi O, d'Ischia M, De Cola L. Towards Eumelanin@Zeolite Hybrids: Pore-Size-Controlled 5,6-Dihydroxyindole Polymerization. Chemistry 2014; 20:1597-601. [DOI: 10.1002/chem.201303682] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2013] [Indexed: 11/08/2022]
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27
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Peterson MB, Le-Masurier SP, Lim K, Hook JM, Martens P, Granville AM. Incorporation of 5-Hydroxyindazole into the Self-Polymerization of Dopamine for Novel Polymer Synthesis. Macromol Rapid Commun 2013; 35:291-7. [DOI: 10.1002/marc.201300746] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2013] [Revised: 11/01/2013] [Indexed: 11/10/2022]
Affiliation(s)
- Matthew B. Peterson
- Centre for Advanced Macromolecular Design; School of Chemical Engineering; University of New South Wales; Australia
| | - Solomon P. Le-Masurier
- Centre for Advanced Macromolecular Design; School of Chemical Engineering; University of New South Wales; Australia
| | - Khoon Lim
- Graduate School of Biomedical Engineering; University of New South Wales; Australia
| | - James M. Hook
- NMR Facility; Mark Wainwright Analytical Centre; University of New South Wales; Australia
| | - Penny Martens
- Graduate School of Biomedical Engineering; University of New South Wales; Australia
| | - Anthony M. Granville
- Centre for Advanced Macromolecular Design; School of Chemical Engineering; University of New South Wales; Australia
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28
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Ball V, Gracio J, Vila M, Singh MK, Metz-Boutigue MH, Michel M, Bour J, Toniazzo V, Ruch D, Buehler MJ. Comparison of synthetic dopamine-eumelanin formed in the presence of oxygen and Cu2+ cations as oxidants. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:12754-12761. [PMID: 24015825 DOI: 10.1021/la4029782] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Eumelanin is not only a ubiquitous pigment among living organisms with photoprotective and antioxidant functions, but is also the subject of intense interest in materials science due to its photoconductivity and as a possible universal coating platform, known as "polydopamine films". The structure of eumelanin remains largely elusive, relying either on a polymeric model or on a heterogeneous aggregate structure. The structure of eumelanin as well as that of the closely related "polydopamine films" can be modified by playing on the nature of the oxidant used to oxidize dopamine or related compounds. In this investigation, we show that dopamine-eumelanins produced from dopamine in the presence of either air (O2 being the oxidant) or Cu(2+) cations display drastically different optical and colloidal properties in relation with a different supramolecular assembly of the oligomers of 5,6 dihydroxyindole, the final oxidation product of dopamine. The possible origin of these differences is discussed on the basis of Cu(2+) incorporation in Cu dopamine-eumelanin.
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Affiliation(s)
- Vincent Ball
- Faculté de Chirurgie Dentaire, Université de Strasbourg , 1 Place de l'Hôpital, 67000 Strasbourg, France
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29
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Panzella L, Gentile G, D'Errico G, Della Vecchia NF, Errico ME, Napolitano A, Carfagna C, d'Ischia M. Atypical Structural and π-Electron Features of a Melanin Polymer That Lead to Superior Free-Radical-Scavenging Properties. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201305747] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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30
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Panzella L, Gentile G, D'Errico G, Della Vecchia NF, Errico ME, Napolitano A, Carfagna C, d'Ischia M. Atypical structural and π-electron features of a melanin polymer that lead to superior free-radical-scavenging properties. Angew Chem Int Ed Engl 2013; 52:12684-7. [PMID: 24123614 DOI: 10.1002/anie.201305747] [Citation(s) in RCA: 213] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Indexed: 11/12/2022]
Affiliation(s)
- Lucia Panzella
- Department of Chemical Sciences, University of Naples "Federico II", Via Cintia 4, 80126 Naples (Italy)
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Pezzella A, Crescenzi O, Panzella L, Napolitano A, Land EJ, Barone V, d’Ischia M. Free Radical Coupling of o-Semiquinones Uncovered. J Am Chem Soc 2013; 135:12142-9. [DOI: 10.1021/ja4067332] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alessandro Pezzella
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 4, I-80126
Naples, Italy
| | - Orlando Crescenzi
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 4, I-80126
Naples, Italy
| | - Lucia Panzella
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 4, I-80126
Naples, Italy
| | - Alessandra Napolitano
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 4, I-80126
Naples, Italy
| | - Edward J. Land
- STFC Daresbury Laboratory, Daresbury, WA4 4AD, United
Kingdom
- Chemistry Section,
School of Physical and Geographical Sciences, Keele University, Staffs ST5 5BG, United Kingdom
| | - Vincenzo Barone
- Scuola Normale Superiore, Piazza dei Cavalieri
7, I-56126 Pisa, Italy
| | - Marco d’Ischia
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 4, I-80126
Naples, Italy
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Song Q, Li M, Huang L, Wu Q, Zhou Y, Wang Y. Bifunctional polydopamine@Fe3O4 core–shell nanoparticles for electrochemical determination of lead(II) and cadmium(II). Anal Chim Acta 2013; 787:64-70. [DOI: 10.1016/j.aca.2013.06.010] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2013] [Revised: 06/02/2013] [Accepted: 06/12/2013] [Indexed: 12/01/2022]
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d'Ischia M, Wakamatsu K, Napolitano A, Briganti S, Garcia-Borron JC, Kovacs D, Meredith P, Pezzella A, Picardo M, Sarna T, Simon JD, Ito S. Melanins and melanogenesis: methods, standards, protocols. Pigment Cell Melanoma Res 2013; 26:616-33. [PMID: 23710556 DOI: 10.1111/pcmr.12121] [Citation(s) in RCA: 281] [Impact Index Per Article: 25.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2013] [Accepted: 05/17/2013] [Indexed: 01/03/2023]
Abstract
Despite considerable advances in the past decade, melanin research still suffers from the lack of universally accepted and shared nomenclature, methodologies, and structural models. This paper stems from the joint efforts of chemists, biochemists, physicists, biologists, and physicians with recognized and consolidated expertise in the field of melanins and melanogenesis, who critically reviewed and experimentally revisited methods, standards, and protocols to provide for the first time a consensus set of recommended procedures to be adopted and shared by researchers involved in pigment cell research. The aim of the paper was to define an unprecedented frame of reference built on cutting-edge knowledge and state-of-the-art methodology, to enable reliable comparison of results among laboratories and new progress in the field based on standardized methods and shared information.
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Affiliation(s)
- Marco d'Ischia
- Department of Chemical Sciences, University of Naples Federico II, Naples, Italy.
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Xuan Y, Jiang G, Li Y, Wang J, Geng H. Inhibiting effect of dopamine adsorption and polymerization on hydrated swelling of montmorillonite. Colloids Surf A Physicochem Eng Asp 2013. [DOI: 10.1016/j.colsurfa.2013.01.038] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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35
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Ascione L, Pezzella A, Ambrogi V, Carfagna C, d'Ischia M. Intermolecular π-Electron Perturbations Generate Extrinsic Visible Contributions to Eumelanin Black Chromophore in Model Polymers with Interrupted Interring Conjugation. Photochem Photobiol 2012; 89:314-8. [DOI: 10.1111/php.12003] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2012] [Accepted: 09/20/2012] [Indexed: 12/01/2022]
Affiliation(s)
- Laura Ascione
- Department of Chemical Sciences; University of Naples Federico II; Naples; Italy
| | - Alessandro Pezzella
- Department of Chemical Sciences; University of Naples Federico II; Naples; Italy
| | - Veronica Ambrogi
- Department of Materials and Production Engineering; University of Naples Federico II; Naples; Italy
| | | | - Marco d'Ischia
- Department of Chemical Sciences; University of Naples Federico II; Naples; Italy
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Synthesis and structural characterization of soluble neuromelanin analogs provides important clues to its biosynthesis. J Biol Inorg Chem 2012; 18:81-93. [DOI: 10.1007/s00775-012-0951-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2012] [Accepted: 10/11/2012] [Indexed: 10/27/2022]
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Adinolfi M, d'Ischia M, Iadonisi A, Leone L, Pezzella A, Valerio S. Glycosylated Eumelanin Building Blocks by Thioglycosylation of 5,6-Diacetoxyindole with an Expedient Selenium-Based Dynamic-Mixture Methodology. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200299] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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38
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Arzillo M, Mangiapia G, Pezzella A, Heenan RK, Radulescu A, Paduano L, d'Ischia M. Eumelanin buildup on the nanoscale: aggregate growth/assembly and visible absorption development in biomimetic 5,6-dihydroxyindole polymerization. Biomacromolecules 2012; 13:2379-90. [PMID: 22651227 DOI: 10.1021/bm3006159] [Citation(s) in RCA: 103] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Establishing structure-property relationships in the black insoluble eumelanins, the key determinants of human pigmentation and skin photoprotective system, is a considerable conceptual and experimental challenge in the current drive for elucidation of the biological roles of these biopolymers and their application as advanced materials for organoelectronics. Herein, we report a new breakthrough toward this goal by the first detailed investigation on the nanoscale level of the oxidative polymerization of 5,6-dihydroxyindole (DHI), a model process of eumelanin synthesis. On the basis of a combined use of spectrophotometry, dynamic light scattering (DLS), and small-angle neutron scattering (SANS) investigations, it was possible to unveil the dynamics of the aggregation process before precipitation, the key relationships with visible light absorption and the shape of fundamental aggregates. The results indicated a polymerization mechanism of the type: Polymer(n) + DHI(x) = Polymer(n+x), where DHI(x) indicates monomer, dimer, or low oligomers (x ≤ 5). During polymerization, visible absorption increases rapidly, reaching a plateau. Particle growth proceeds slowly, with formation of 2-D structures ~55 nm thick, until precipitation occurs, that is, when large aggregates with a maximum hydrodynamic radius (R(h)) of ~1200 nm are formed. Notably, markedly smaller R(h) values, up to ~110 nm, were determined in the presence of poly(vinyl alcohol) (PVA) that was shown to be an efficient aggregation-preventing agent for polymerizing DHI ensuring water solubilization. Finally, it is shown that DHI monomer can be efficiently and partially irreversibly depleted from aqueous solutions by the addition of eumelanin suspensions. This behavior is suggested to reflect oxidant-independent competing pathways of polymer synthesis and buildup via monomer conversion on the active aggregate surface contributing to particle growth. Besides filling crucial gaps in DHI polymerization, these results support the attractive hypothesis that eumelanins may behave as a peculiar example of living biopolymers. The potential of PVA as a powerful tool for solution chemistry-based investigations of eumelanin supramolecular organization and for technological manipulation purposes is underscored.
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Affiliation(s)
- Marianna Arzillo
- Department of Chemical Sciences, University of Naples Federico II, Napoli (NA), Italy
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Reale S, Crucianelli M, Pezzella A, d'Ischia M, De Angelis F. Exploring the frontiers of synthetic eumelanin polymers by high-resolution matrix-assisted laser/desorption ionization mass spectrometry. JOURNAL OF MASS SPECTROMETRY : JMS 2012; 47:49-53. [PMID: 22282089 DOI: 10.1002/jms.2025] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
New trends in material science and nanotechnologies have spurred growing interest in eumelanins black insoluble biopolymers derived by tyrosinase-catalysed oxidation of tyrosine via 5,6-dihydroxyindole (DHI) and its 2-carboxylic acid (DHICA). Efficient antioxidant and photoprotective actions, associated with peculiar optoelectronic properties, are recognised as prominent functions of eumelanin macromolecules within the human and mammalian pigmentary system, making them unique candidates for the realisation of innovative bio-inspired functional soft materials, with structure-based physical-chemical properties. An unprecedented breakthrough into the mechanism of synthetic eumelanin buildup has derived from a detailed investigation of the oxidative polymerization of DHI and its N-methyl derivative (NMDHI) by linear and reflectron matrix-assisted laser/desorption ionization mass spectrometry. Regular collections of oligomers of increasing masses, spanning the entire m/z ranges up to 5000 Da (>30-mer) and 8000 Da (> 50-mer) for the two building blocks, respectively, were disclosed. It is the first time that the in vitro polymerisation of dihydroxyindoles to form synthetic eumelanins is explored up to its high mass limits, giving at the same time information on the polymerisation mode, whether it follows a stepwise pattern (being this the conclusion in our case) or a staking sequencing of small-sized entities. It also highlighted the influence of the N-methyl substituent on the polymerization process; this opens the way to the production of N-functionalized, synthetic eumelanin-inspired soft materials, for possible future technological applications.
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Affiliation(s)
- Samantha Reale
- Department of Chemistry, Chemical Engineering and Materials, University of L'Aquila, Via Vetoio, I-67100, Coppito, L'Aquila, Italy
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Ball V, Del Frari D, Michel M, Buehler MJ, Toniazzo V, Singh MK, Gracio J, Ruch D. Deposition Mechanism and Properties of Thin Polydopamine Films for High Added Value Applications in Surface Science at the Nanoscale. BIONANOSCIENCE 2011. [DOI: 10.1007/s12668-011-0032-3] [Citation(s) in RCA: 100] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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41
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Lynge ME, van der Westen R, Postma A, Städler B. Polydopamine--a nature-inspired polymer coating for biomedical science. NANOSCALE 2011; 3:4916-28. [PMID: 22024699 DOI: 10.1039/c1nr10969c] [Citation(s) in RCA: 571] [Impact Index Per Article: 43.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Polymer coatings are of central importance for many biomedical applications. In the past few years, poly(dopamine) (PDA) has attracted considerable interest for various types of biomedical applications. This feature article outlines the basic chemistry and material science regarding PDA and discusses its successful application from coatings for interfacing with cells, to drug delivery and biosensing. Although many questions remain open, the primary aim of this feature article is to illustrate the advent of PDA on its way to become a popular polymer for bioengineering purposes.
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42
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Hyogo R, Nakamura A, Okuda H, Wakamatsu K, Ito S, Sota T. Mid-infrared vibrational spectroscopic characterization of 5,6-dihydroxyindole and eumelanin derived from it. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2011.10.043] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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43
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d'Ischia M, Napolitano A, Pezzella A. 5,6‐Dihydroxyindole Chemistry: Unexplored Opportunities Beyond Eumelanin. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100796] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Marco d'Ischia
- Department of Organic Chemistry and Biochemistry, University of Naples “Federico II”, Via Cintia 4, 80126 Naples, Italy
| | - Alessandra Napolitano
- Department of Organic Chemistry and Biochemistry, University of Naples “Federico II”, Via Cintia 4, 80126 Naples, Italy
| | - Alessandro Pezzella
- Department of Organic Chemistry and Biochemistry, University of Naples “Federico II”, Via Cintia 4, 80126 Naples, Italy
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44
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Capelli L, Crescenzi O, Manini P, Pezzella A, Barone V, d’Ischia M. π-Electron Manipulation of the 5,6-Dihydroxyindole/Quinone System by 3-Alkynylation: Mild Acid-Mediated Entry to (Cross)-Conjugated Scaffolds and Paradigms for Medium-Tunable Chromophores. J Org Chem 2011; 76:4457-66. [DOI: 10.1021/jo200232t] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | | | | | - Vincenzo Barone
- Scuola Normale Superiore di Pisa, Piazza dei Cavalieri 7, I-56126 Pisa, Italy
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45
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Chen S, Tai KY, Webster RD. The Effect of the Buffering Capacity of the Supporting Electrolyte on the Electrochemical Oxidation of Dopamine and 4-Methylcatechol in Aqueous and Nonaqueous Solvents. Chem Asian J 2011; 6:1492-9. [DOI: 10.1002/asia.201000909] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2010] [Indexed: 11/06/2022]
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46
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Bernsmann F, Ball V, Addiego F, Ponche A, Michel M, Gracio JJDA, Toniazzo V, Ruch D. Dopamine-melanin film deposition depends on the used oxidant and buffer solution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:2819-25. [PMID: 21332218 DOI: 10.1021/la104981s] [Citation(s) in RCA: 337] [Impact Index Per Article: 25.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The deposition of "polydopamine" films, from an aqueous solution containing dopamine or other catecholamines, constitutes a new and versatile way to functionalize solid-liquid interfaces. Indeed such films can be deposited on almost all kinds of materials. Their deposition kinetics does not depend markedly on the surface chemistry of the substrate, and the films can reach thickness of a few tens of nanometers in a single reaction step. Up to now, even if a lot is known about the oxidation mechanism of dopamine in solution, only little information is available to describe the deposition mechanism on surfaces either by oxidation in solution or by electrodeposition. The deposition kinetics of melanin was only investigated from dopamine solutions using oxygen or ammonium persulfate as an oxidant and from a tris(hydroxymethyl) aminomethane (Tris) containing buffer solutions at pH 8.5. Many other oxidants could be used, and the buffer agent containing a primary amine group may influence the deposition process. Herein we show that the deposition kinetics of melanin from dopamine containing buffers at pH 8.5 can be markedly modified using Cu(2+) instead of O2 as an oxidant: the deposition kinetics remains linear up to thicknesses of more than 70 nm, whereas the film growth stops at 45 ± 5 nm in the presence of 02. In addition, the films prepared from Cu(2+) containing solutions display an absorption spectrum with defined peaks at 320 and 370 nm, which are absent in the spectra of films prepared in oxygenated solutions. The replacement of Tris buffer by phosphate buffer also has a marked effect on the melanin deposition kinetics.
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Affiliation(s)
- Falk Bernsmann
- Institut National de la Santé et de la Recherche Médicale , Unité 977 11 rue Humann, 67085 Strasbourg Cedex, France
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47
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Belen’kii L, Gramenitskaya V, Evdokimenkova Y. The Literature of Heterocyclic Chemistry, Part X, 2005–2007. ADVANCES IN HETEROCYCLIC CHEMISTRY 2011. [DOI: 10.1016/b978-0-12-385464-3.00001-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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48
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Greco G, Panzella L, Gentile G, Errico ME, Carfagna C, Napolitano A, d'Ischia M. A melanin-inspired pro-oxidant system for dopa(mine) polymerization: mimicking the natural casing process. Chem Commun (Camb) 2011; 47:10308-10. [DOI: 10.1039/c1cc13731j] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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49
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Arzillo M, Pezzella A, Crescenzi O, Napolitano A, Land EJ, Barone V, d’Ischia M. Cyclic Structural Motifs in 5,6-Dihydroxyindole Polymerization Uncovered: Biomimetic Modular Buildup of a Unique Five-Membered Macrocycle. Org Lett 2010; 12:3250-3. [DOI: 10.1021/ol101188c] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Marianna Arzillo
- Department of Organic Chemistry and Biochemistry and “Paolo Corradini” Department of Chemistry, University of Naples Federico II, Italy, Scuola Normale Superiore di Pisa, Italy, Lennard-Jones Laboratories, School of Physical & Geographical Sciences, Keele University, United Kingdom
| | - Alessandro Pezzella
- Department of Organic Chemistry and Biochemistry and “Paolo Corradini” Department of Chemistry, University of Naples Federico II, Italy, Scuola Normale Superiore di Pisa, Italy, Lennard-Jones Laboratories, School of Physical & Geographical Sciences, Keele University, United Kingdom
| | - Orlando Crescenzi
- Department of Organic Chemistry and Biochemistry and “Paolo Corradini” Department of Chemistry, University of Naples Federico II, Italy, Scuola Normale Superiore di Pisa, Italy, Lennard-Jones Laboratories, School of Physical & Geographical Sciences, Keele University, United Kingdom
| | - Alessandra Napolitano
- Department of Organic Chemistry and Biochemistry and “Paolo Corradini” Department of Chemistry, University of Naples Federico II, Italy, Scuola Normale Superiore di Pisa, Italy, Lennard-Jones Laboratories, School of Physical & Geographical Sciences, Keele University, United Kingdom
| | - Edward J. Land
- Department of Organic Chemistry and Biochemistry and “Paolo Corradini” Department of Chemistry, University of Naples Federico II, Italy, Scuola Normale Superiore di Pisa, Italy, Lennard-Jones Laboratories, School of Physical & Geographical Sciences, Keele University, United Kingdom
| | - Vincenzo Barone
- Department of Organic Chemistry and Biochemistry and “Paolo Corradini” Department of Chemistry, University of Naples Federico II, Italy, Scuola Normale Superiore di Pisa, Italy, Lennard-Jones Laboratories, School of Physical & Geographical Sciences, Keele University, United Kingdom
| | - Marco d’Ischia
- Department of Organic Chemistry and Biochemistry and “Paolo Corradini” Department of Chemistry, University of Naples Federico II, Italy, Scuola Normale Superiore di Pisa, Italy, Lennard-Jones Laboratories, School of Physical & Geographical Sciences, Keele University, United Kingdom
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50
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Ramesh C, Kavala V, Kuo CW, Raju BR, Yao CF. An Unprecedented Route for the Synthesis of 3,3′-Biindoles by Reductive Cyclization of 3-[2-Nitro-1-(2-nitrophenyl)ethyl]-1H-indoles Mediated by Iron/Acetic Acid. European J Org Chem 2010. [DOI: 10.1002/ejoc.201000276] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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