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Santos PRM, Johny A, Silva CQ, Azenha MA, Vázquez JA, Valcarcel J, Pereira CM, Silva AF. Improved Metal Cation Optosensing Membranes through the Incorporation of Sulphated Polysaccharides. Molecules 2022; 27:molecules27155026. [PMID: 35956976 PMCID: PMC9370371 DOI: 10.3390/molecules27155026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Revised: 07/31/2022] [Accepted: 08/03/2022] [Indexed: 12/04/2022]
Abstract
Optosensing chitosan-based membranes have been applied for the detection of heavy metals, especially in drinking water. The novelty of this study is based on the use of sulphated polysaccharides, in such optosensing membranes, aiming at an improved analytical performance. The sulphated polysaccharides, such as ulvan, fucoidan and chondroitin sulfate, were extracted from by-products and wastes of marine-related activities. The membranes were developed for the analysis of aluminum. The variation in the visible absorbance of the sensor membranes after the contact between the chromophore and the aluminum cation was studied. The membranes containing sulphated polysaccharides showed improved signals when compared to the chitosan-only membrane. As for the detection limits for the membranes containing ulvan, fucoidan and chondroitin sulfate, 0.17 mg L−1, 0.21 mg L−1 and 0.36 mg L−1 were obtained, respectively. The values were much lower than that obtained for the chitosan-only membrane, 0.52 mg L−1, which shows the improvement obtained from the sulphated polysaccharides. The results were obtained with the presence of CTAB in analysis solution, which forms a ternary complex with the aluminum cation and the chromophore. This resulted in an hyperchromic and batochromic shift in the absorption band. When in the presence of this surfactant, the membranes showed lower detection limits and higher selectivity.
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Affiliation(s)
- P. R. M. Santos
- Research Center in Chemistry UP (CIQUP), Institute of Molecular Sciences (IMS); Departamento de Química e Bioquímica, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal
| | - A. Johny
- Research Center in Chemistry UP (CIQUP), Institute of Molecular Sciences (IMS); Departamento de Química e Bioquímica, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal
| | - C. Q. Silva
- Research Center in Chemistry UP (CIQUP), Institute of Molecular Sciences (IMS); Departamento de Química e Bioquímica, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal
- KAUST Catalysis Center, Catalysis Nanomaterials and Spectroscopy (CNS), King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia
| | - M. A. Azenha
- Research Center in Chemistry UP (CIQUP), Institute of Molecular Sciences (IMS); Departamento de Química e Bioquímica, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal
- Correspondence: ; Tel.: +351-220402628
| | - J. A. Vázquez
- Grupo de Reciclado y Valorización de Materiales Residuales (REVAL), Instituto de Investigaciones Marinas (IIM-CSIC), C/Eduardo Cabello, 6, 36208 Vigo, Spain
| | - J. Valcarcel
- Grupo de Reciclado y Valorización de Materiales Residuales (REVAL), Instituto de Investigaciones Marinas (IIM-CSIC), C/Eduardo Cabello, 6, 36208 Vigo, Spain
| | - C. M. Pereira
- Research Center in Chemistry UP (CIQUP), Institute of Molecular Sciences (IMS); Departamento de Química e Bioquímica, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal
| | - A. F. Silva
- Research Center in Chemistry UP (CIQUP), Institute of Molecular Sciences (IMS); Departamento de Química e Bioquímica, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal
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