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Open AccessArticle

Halochromic Polystyrene Nanofibers Obtained by Solution Blow Spinning for Wine pH Sensing

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Graduate Program in Biomaterials Engineering, Federal University of Lavras, Lavras 37200-000, Brazil
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Nanotechnology National Laboratory for Agriculture, Embrapa Instrumentação, São Carlos 13560-970, Brazil
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Department of Chemistry, Federal University of Lavras, Lavras 37200-000, Brazil
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Food Engineering Department, Federal University of Ceara, Fortaleza 60356-000, Brazil
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Packaging Laboratory, Embrapa Agroindustria Tropical, Fortaleza 60511-110, Brazil
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Department of Engineering, Federal University of Lavras, Lavras 37200-000, Brazil
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Author to whom correspondence should be addressed.
Sensors 2020, 20(2), 417; https://doi.org/10.3390/s20020417
Received: 20 October 2019 / Revised: 4 January 2020 / Accepted: 7 January 2020 / Published: 11 January 2020
(This article belongs to the Section Sensor Materials)
Colorimetric sensors developed by the solution blow spinning (SBS) technique have a rapid response to a variation in different physicochemical properties. In this study, polystyrene nanofibrous (PSNF) mats containing the bromothymol blue (BTB) indicator were obtained by SBS for the pH sensing of wine sample. The incorporation of the indicator did not promote changes in fiber diameter but led to the appearance of beads, allowing for the encapsulation of BTB. The halochromic property of BTB was retained in the PSNF material, and the migration tests showed that the indicator mats presented values below the maximum acceptable limit (10 mg dm−2) established by EU Commission Regulation No. 10/2011 for foods with an alcohol content up to 20%. The present study opens the possibility of applying nanostructured materials to innovative food packaging which, through nanosensory zones, change color as a function of the food pH. View Full-Text
Keywords: nanofiber; sensor; smart packaging nanofiber; sensor; smart packaging
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MDPI and ACS Style

Miranda, K.W.; Natarelli, C.V.L.; Thomazi, A.C.; Ferreira, G.M.D.; Frota, M.M.; Bastos, M.S.R.; Mattoso, L.H.C.; Oliveira, J.E. Halochromic Polystyrene Nanofibers Obtained by Solution Blow Spinning for Wine pH Sensing. Sensors 2020, 20, 417.

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