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PVA Nanofibers as an Insoluble pH Sensor

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PVA Nanofibers as an Insoluble pH Sensor

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dc.contributor.author Mínguez-García, David es_ES
dc.contributor.author Montava-Seguí, Ignacio es_ES
dc.contributor.author BONET-ARACIL, MARILÉS es_ES
dc.contributor.author Gisbert Paya, Jaime es_ES
dc.contributor.author Díaz-García, Pablo es_ES
dc.date.accessioned 2024-02-26T19:02:42Z
dc.date.available 2024-02-26T19:02:42Z
dc.date.issued 2023-12 es_ES
dc.identifier.uri http://hdl.handle.net/10251/202777
dc.description.abstract [EN] Turmeric has been widely studied as a color indicator for pH variations due to its halochromic properties. It has been tested in solution or included in some polymeric matrices. Some studies have demonstrated that its change in color is due to the tautomeric species of curcumin, and this property can be observed even if turmeric is assimilated in a film or nanofiber. Chitosan/polyethylene oxide (PEO) polymers have been tested in previous studies. Polyvinyl alcohol (PVA) nanofibers are used as potential carriers of drugs once they are insolubilized. The aim of this work is to cross-link PVA with citric acid (CA) to insolubilize the nanofibers and determine the effect on turmeric¿s halochromic properties. The nanofibers were treated with a sodium hydroxide (NaOH) solution, and a chromatic study was undertaken to determine color change. The change in color was assessed by eye (subjective) and by spectroscopy (objective). The nanofibers were characterized, in addition to the colorimetric study, by Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM) as well. The results demonstrate how thermal treatment induces cross-linking between the nanofibers, allowing them to keep their shape once the NaOH solution is applied to them. The opposite effect (solubilization) can be observed for non-cross-linked (NCL) samples. Although the final color varied, the cross-linked (CL) nanofibers¿ halochromic behavior was maintained. It was demonstrated that during cross-linking, ester groups are formed from the free carboxyl group in the cross-linked CA and the ketones present in the curcumin under acid conditions. So, CA acts as an acid catalyst to bond turmeric to the cross-linked PVA nanofibers. es_ES
dc.description.sponsorship This research was funded by INSTITUTO VALENCIANO DE COMPETITIVIDAD EMPRESARIAL (IVACE), through the nominative line assigned to the Universitat Politècnica de València, approved by the Generalitat Valenciana Budget Act 2023. es_ES
dc.language Inglés es_ES
dc.publisher MDPI AG es_ES
dc.relation.ispartof Polymers es_ES
dc.rights Reconocimiento (by) es_ES
dc.subject Turmeric es_ES
dc.subject Citric acid es_ES
dc.subject Cross-linking es_ES
dc.subject.classification INGENIERIA TEXTIL Y PAPELERA es_ES
dc.title PVA Nanofibers as an Insoluble pH Sensor es_ES
dc.type Artículo es_ES
dc.identifier.doi 10.3390/polym15234480 es_ES
dc.rights.accessRights Abierto es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Ingeniería Textil y Papelera - Departament d'Enginyeria Tèxtil i Paperera es_ES
dc.contributor.affiliation Universitat Politècnica de València. Escuela Politécnica Superior de Alcoy - Escola Politècnica Superior d'Alcoi es_ES
dc.description.bibliographicCitation Mínguez-García, D.; Montava-Seguí, I.; Bonet-Aracil, M.; Gisbert Paya, J.; Díaz-García, P. (2023). PVA Nanofibers as an Insoluble pH Sensor. Polymers. 15(23). https://doi.org/10.3390/polym15234480 es_ES
dc.description.accrualMethod S es_ES
dc.relation.publisherversion https://doi.org/10.3390/polym15234480 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 15 es_ES
dc.description.issue 23 es_ES
dc.identifier.eissn 2073-4360 es_ES
dc.identifier.pmid 38231937 es_ES
dc.identifier.pmcid PMC10708422 es_ES
dc.relation.pasarela S\504167 es_ES
dc.contributor.funder Institut Valencià de Competitivitat Empresarial es_ES
upv.costeAPC 2541 es_ES


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