Development of polycaprolactone-based electrospun pH-sensitive sensors as instant colorimetric indicators for food packaging / Nihal Guclu in COLORATION TECHNOLOGY, Vol. 139, N° 5 (10/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 5 (10/2023) . - p. 527-543 Titre : Development of polycaprolactone-based electrospun pH-sensitive sensors as instant colorimetric indicators for food packaging Type de document : texte imprimé Auteurs : Nihal Guclu, Auteur ; Sebnem Duzyer Gebizli, Auteur ; Mehmet Orhan, Auteur Année de publication : 2023 Article en page(s) : p. 527-543 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aliments -- Emballages -- Aspect sanitaire Anthocyanes Capteurs chimiques Caractérisation Colorimétrie Electrofilature Essais dynamiques Mouillabilité Nanofibres pH -- Mesure Poly-e-caprolactone Polyéthylène glycol Solutions (chimie) Textiles et tissus synthétiques Traction (mécanique) Index. décimale : 667.3 Teinture et impression des tissus Résumé : In the present study, polycaprolactone/polyethylene glycol (PCL/PEG) electrospun nanofibres with different anthocyanin (1%, 2%, 3%, and 5%) were fabricated for the instant measurement of pH, especially for applications—such as food freshness detection—where quick response is required. The solution, surface, chemical, thermal, wettability, mechanical, and release properties of the samples were evaluated by viscosity measurements, scanning electron microscopy (SEM), Fourier-transform infrared (FTIR), contact angle measurements, and tensile tests, respectively. The colorimetric analyses were also investigated against the solutions at different pH values and bacterial solutions. Finally, the on-site performance of the sensor was evaluated. Anthocyanin addition initially lowered the solution viscosity, resulting in thinner fibres with a diameter of 288 nm. The diameters were increased up to 395 nm with the increasing anthocyanin. Anthocyanin addition enhanced the wettability and the mechanical properties, and the contact angles decreased to 43°. The highest modulus was observed for 1% anthocyanin, with a value of 6.162. The release experiments revealed that the anthocyanin-loaded samples released a large amount of anthocyanin (between ~12% and 38%) in the first 15 s. The colorimetric analyses showed that PCL/PEG nanofibre mats with 2% and 3% anthocyanin concentrations were the most capable pH-sensitive sensors for detecting pH changes from 2 to 8. As a result, it can be concluded that 3% anthocyanin is the threshold value for the production of the anthocyanin-loaded nanofibre mats, and these structures are promising for the instant detection of pH proved by the on-site application. Note de contenu : - MATERIALS AND METHODS - RESULTS AND DISCUSSION : Solution characterisation - Nanofibre characterisation - Tensile tests - Release experiments - The pH response and colorimetric analyses - The pH response against bacterial solutions - On-site application - Table 1 : Electrospinning parameters - Table 2 : Solution characterisation and average diameters of the nanofibre mats - Table 3 : Elemental analyses of the nanofibre mats - Table 4 : FTIR spectra of PCL and PEG - Table 5 : FTIR spectrum of anthocyanin - Table 6 : Mechanical properties of the nanofibre mats - Table 7 : Colour changes of the nanofibre mats depending on different pH values - Table 8 : Colour changes of the nanofibre mats depending on bacterial growth DOI : https://doi.org/10.1111/cote.12701 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12701 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39833 [article]

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