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Photo-potentiometry: Sensing of sugars using a pH-probe coated with a film of intrinsically microporous polyamine containing graphitic carbon nitride photocatalyst

Fernanda C O L Martins, Wanessa R Melchert, Mariolino Carta Orcid Logo, Neil B McKeown, Frank Marken

Talanta, Volume: 296, Start page: 128461

Swansea University Author: Mariolino Carta Orcid Logo

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DOI (Published version): 10.1016/j.talanta.2025.128461

Abstract

At proof-of-concept level, the photochemical transformation of glucose (or more generally of carbohydrates) can be detected analytically as a localised pH change. Using a conventional potentiometric pH-probe, a microporous coating is developed to explore carbohydrate sensing in the 200-800 μM concen...

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Published in: Talanta
ISSN: 0039-9140 1873-3573
Published: Elsevier BV 2026
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URI: https://cronfa.swan.ac.uk/Record/cronfa69905
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spelling 2025-07-07T11:49:44.5443453 v2 69905 2025-07-07 Photo-potentiometry: Sensing of sugars using a pH-probe coated with a film of intrinsically microporous polyamine containing graphitic carbon nitride photocatalyst 56aebf2bba457f395149bbecbfa6d3eb 0000-0003-0718-6971 Mariolino Carta Mariolino Carta true false 2025-07-07 EAAS At proof-of-concept level, the photochemical transformation of glucose (or more generally of carbohydrates) can be detected analytically as a localised pH change. Using a conventional potentiometric pH-probe, a microporous coating is developed to explore carbohydrate sensing in the 200-800 μM concentration range based on localised pH changes induced by light. The photo-responsive film is based on fibrous cellulose (to aid permeability), photocatalytic graphitic carbon nitride (g-C N ), and an intrinsically microporous polyamine host (PIM-EA-TB, as reaction environment and binder). The film-modified pH-probe is pre-conditioned in a pH 4 buffer (containing phthalate buffer). When immersed in an aqueous solution, switching on a blue LED (λ = 385 nm, approx. 60 mW cm ) causes a pH transient towards alkaline, which is correlated with the carbohydrate concentration (all three glucose, fructose, or sucrose give very similar signals). The LOD is typically 70 μmol dm , with a linear range up to 800 μmol dm . Non-linearity beyond 800 μmol dm is tentatively attributed to limited oxygen availability. The photo-electroanalytical mechanism is discussed in terms of competing proton generation and consumption in the photoactive film linked to oxygen depletion (causing alkaline drift) at the pH-probe surface. Journal Article Talanta 296 128461 Elsevier BV 0039-9140 1873-3573 Photo-electroanalysis; Chronopotentiometry; Photo-pH-probe; Carbohydrates; Sugary drinks 1 1 2026 2026-01-01 10.1016/j.talanta.2025.128461 COLLEGE NANME Engineering and Applied Sciences School COLLEGE CODE EAAS Swansea University Another institution paid the OA fee F.C.O.L. Martins and W.R. Melchert acknowledge the financial support from Brazilian Government Agencies, including the Brazilian National Council for Scientific and Technological Development (CNPq, grants 305538/2022–5) and, in part by the Coordination of Superior Level Staff Improvement (CAPES) - Finance Code 001. F. Marken acknowledges initial funding from EPSRC (EP/K004956/1). 2025-07-07T11:49:44.5443453 2025-07-07T10:24:54.4847561 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemistry Fernanda C O L Martins 1 Wanessa R Melchert 2 Mariolino Carta 0000-0003-0718-6971 3 Neil B McKeown 4 Frank Marken 5 69905__34686__b7dabb0814f24a44be8783410bdc1c54.pdf 69905.VOR.pdf 2025-07-07T11:47:37.2526910 Output 5752751 application/pdf Version of Record true © 2025 The Authors. This is an open access article under the CC BY license. true eng http://creativecommons.org/licenses/by/4.0/
title Photo-potentiometry: Sensing of sugars using a pH-probe coated with a film of intrinsically microporous polyamine containing graphitic carbon nitride photocatalyst
spellingShingle Photo-potentiometry: Sensing of sugars using a pH-probe coated with a film of intrinsically microporous polyamine containing graphitic carbon nitride photocatalyst
Mariolino Carta
title_short Photo-potentiometry: Sensing of sugars using a pH-probe coated with a film of intrinsically microporous polyamine containing graphitic carbon nitride photocatalyst
title_full Photo-potentiometry: Sensing of sugars using a pH-probe coated with a film of intrinsically microporous polyamine containing graphitic carbon nitride photocatalyst
title_fullStr Photo-potentiometry: Sensing of sugars using a pH-probe coated with a film of intrinsically microporous polyamine containing graphitic carbon nitride photocatalyst
title_full_unstemmed Photo-potentiometry: Sensing of sugars using a pH-probe coated with a film of intrinsically microporous polyamine containing graphitic carbon nitride photocatalyst
title_sort Photo-potentiometry: Sensing of sugars using a pH-probe coated with a film of intrinsically microporous polyamine containing graphitic carbon nitride photocatalyst
author_id_str_mv 56aebf2bba457f395149bbecbfa6d3eb
author_id_fullname_str_mv 56aebf2bba457f395149bbecbfa6d3eb_***_Mariolino Carta
author Mariolino Carta
author2 Fernanda C O L Martins
Wanessa R Melchert
Mariolino Carta
Neil B McKeown
Frank Marken
format Journal article
container_title Talanta
container_volume 296
container_start_page 128461
publishDate 2026
institution Swansea University
issn 0039-9140
1873-3573
doi_str_mv 10.1016/j.talanta.2025.128461
publisher Elsevier BV
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Chemistry{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Chemistry
document_store_str 1
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description At proof-of-concept level, the photochemical transformation of glucose (or more generally of carbohydrates) can be detected analytically as a localised pH change. Using a conventional potentiometric pH-probe, a microporous coating is developed to explore carbohydrate sensing in the 200-800 μM concentration range based on localised pH changes induced by light. The photo-responsive film is based on fibrous cellulose (to aid permeability), photocatalytic graphitic carbon nitride (g-C N ), and an intrinsically microporous polyamine host (PIM-EA-TB, as reaction environment and binder). The film-modified pH-probe is pre-conditioned in a pH 4 buffer (containing phthalate buffer). When immersed in an aqueous solution, switching on a blue LED (λ = 385 nm, approx. 60 mW cm ) causes a pH transient towards alkaline, which is correlated with the carbohydrate concentration (all three glucose, fructose, or sucrose give very similar signals). The LOD is typically 70 μmol dm , with a linear range up to 800 μmol dm . Non-linearity beyond 800 μmol dm is tentatively attributed to limited oxygen availability. The photo-electroanalytical mechanism is discussed in terms of competing proton generation and consumption in the photoactive film linked to oxygen depletion (causing alkaline drift) at the pH-probe surface.
published_date 2026-01-01T05:29:25Z
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