Melanin system composition analyzed by XPS depth profiling

Paulin, J.V.; McGettrick, James; Graeff, C.F.O.; Mostert, Bernard

doi:10.1016/j.surfin.2021.101053

Journal article 751 views 209 downloads

Melanin system composition analyzed by XPS depth profiling

J.V. Paulin, James McGettrick

, C.F.O. Graeff, Bernard Mostert

Surfaces and Interfaces, Volume: 24, Start page: 101053

Swansea University Authors: James McGettrick , Bernard Mostert

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DOI (Published version): 10.1016/j.surfin.2021.101053

Abstract

The melanins are a class of natural pigments ubiquitous throughout the biosphere. These pigments are gaining significant attention as advanced materials due to their biocompatibility, optical and electrical properties. The most common form of melanin, eumelanin, has a well-known problem of insolubil...

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Published in:	Surfaces and Interfaces
ISSN:	2468-0230 2468-0230
Published:	Elsevier BV 2021
Online Access:	Check full text
URI:	https://cronfa.swan.ac.uk/Record/cronfa56371

first_indexed	2021-03-04T11:41:29Z
last_indexed	2025-01-15T20:00:18Z
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Our result indicates that there are only few differences in the chemical composition of the melanin chemical structure between the surface and bulk, for either the powder of film samples. Our results show that a basic surface probe is sufficient to obtain an accurate elemental composition for basic melanin samples. 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spelling	2025-01-15T15:05:04.4589033 v2 56371 2021-03-04 Melanin system composition analyzed by XPS depth profiling bdbacc591e2de05180e0fd3cc13fa480 0000-0002-7719-2958 James McGettrick James McGettrick true false a353503c976a7338c7708a32e82f451f 0000-0002-9590-2124 Bernard Mostert Bernard Mostert true false 2021-03-04 EAAS The melanins are a class of natural pigments ubiquitous throughout the biosphere. These pigments are gaining significant attention as advanced materials due to their biocompatibility, optical and electrical properties. The most common form of melanin, eumelanin, has a well-known problem of insolubility in most common solvents. The insolubility has made standard chemical analysis challenging, leading to researchers opting to use X-Ray photoelectron spectroscopy (XPS). However, standard XPS used on melanins and related materials have been limited to being a surface technique, and hence reported values to date may not reflect the bulk. In this work, we have investigated with XPS depth-profiling method the chemical information of the surface and the bulk of powder and thin-films eumelanin and several melanin derivatives. These latter derivatives are modified melanins designed to overcome the insolubility of the standard systems. Our result indicates that there are only few differences in the chemical composition of the melanin chemical structure between the surface and bulk, for either the powder of film samples. Our results show that a basic surface probe is sufficient to obtain an accurate elemental composition for basic melanin samples. As such, our analysis indicates that XPS characterization is an important characterization of polyindolequinone systems in general such as the melanins and polydopamines. Journal Article Surfaces and Interfaces 24 101053 Elsevier BV 2468-0230 2468-0230 X-Ray Photoelectron Spectroscopy, Depth-profile XPS, Polyindolequinone, Eumelanin, Melanin derivatives, Polydopamine 1 6 2021 2021-06-01 10.1016/j.surfin.2021.101053 COLLEGE NANME Engineering and Applied Sciences School COLLEGE CODE EAAS Swansea University Not Required JVP and CFOG gratefully acknowledge the financial support of São Paulo Research Foundation (FAPESP; grants 2013/07296-2, 2015/23000-1, 2018/02411-1). A.B.M. is a Sêr Cymru II fellow and the results incorporated in this work is supported by the Welsh Government through the European Union's Horizon 2020 research and innovation program under the Marie Skłodowska‐Curie grant agreement No 663830. J.D.McG thank the EPSRC SPECIFIC project for funding (EP/N020863/1) & WEFO (ERDF) project AIM (80708 & EP/M015254/2) for their ongoing support for XPS maintenance. We thank Prof. Paul Meredith for his thoughts. 2025-01-15T15:05:04.4589033 2021-03-04T11:38:32.8223164 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemistry J.V. Paulin 1 James McGettrick 0000-0002-7719-2958 2 C.F.O. Graeff 3 Bernard Mostert 0000-0002-9590-2124 4 56371__19422__dce85da645ca48be9f5baf30fab20f11.pdf 56371.pdf 2021-03-04T11:41:16.8070876 Output 1465643 application/pdf Accepted Manuscript true 2022-03-02T00:00:00.0000000 ©2021 All rights reserved. All article content, except where otherwise noted, is licensed under a Creative Commons Attribution Non-Commercial No Derivatives License (CC-BY-NC-ND) true eng http://creativecommons.org/licenses/by-nc-nd/4.0/
title	Melanin system composition analyzed by XPS depth profiling
spellingShingle	Melanin system composition analyzed by XPS depth profiling James McGettrick Bernard Mostert
title_short	Melanin system composition analyzed by XPS depth profiling
title_full	Melanin system composition analyzed by XPS depth profiling
title_fullStr	Melanin system composition analyzed by XPS depth profiling
title_full_unstemmed	Melanin system composition analyzed by XPS depth profiling
title_sort	Melanin system composition analyzed by XPS depth profiling
author_id_str_mv	bdbacc591e2de05180e0fd3cc13fa480 a353503c976a7338c7708a32e82f451f
author_id_fullname_str_mv	bdbacc591e2de05180e0fd3cc13fa480_*_James McGettrick a353503c976a7338c7708a32e82f451f_*_Bernard Mostert
author	James McGettrick Bernard Mostert
author2	J.V. Paulin James McGettrick C.F.O. Graeff Bernard Mostert
format	Journal article
container_title	Surfaces and Interfaces
container_volume	24
container_start_page	101053
publishDate	2021
institution	Swansea University
issn	2468-0230 2468-0230
doi_str_mv	10.1016/j.surfin.2021.101053
publisher	Elsevier BV
college_str	Faculty of Science and Engineering
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department_str	School of Engineering and Applied Sciences - Chemistry{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Chemistry
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description	The melanins are a class of natural pigments ubiquitous throughout the biosphere. These pigments are gaining significant attention as advanced materials due to their biocompatibility, optical and electrical properties. The most common form of melanin, eumelanin, has a well-known problem of insolubility in most common solvents. The insolubility has made standard chemical analysis challenging, leading to researchers opting to use X-Ray photoelectron spectroscopy (XPS). However, standard XPS used on melanins and related materials have been limited to being a surface technique, and hence reported values to date may not reflect the bulk. In this work, we have investigated with XPS depth-profiling method the chemical information of the surface and the bulk of powder and thin-films eumelanin and several melanin derivatives. These latter derivatives are modified melanins designed to overcome the insolubility of the standard systems. Our result indicates that there are only few differences in the chemical composition of the melanin chemical structure between the surface and bulk, for either the powder of film samples. Our results show that a basic surface probe is sufficient to obtain an accurate elemental composition for basic melanin samples. As such, our analysis indicates that XPS characterization is an important characterization of polyindolequinone systems in general such as the melanins and polydopamines.
published_date	2021-06-01T08:00:10Z
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score	11.04748

Melanin system composition analyzed by XPS depth profiling

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