Photochromic Paper Indicators for Acidic Food Spoilage
Detection
Posted on 2018-10-18 - 10:33
A photoresponsive
microstructured composite is fabricated through
the impregnation of cellulosic filter paper (FP) with a spiropyran-modified
acrylic polymer. The polymer enwraps uniformly each individual cellulose
fiber, increases the thermal stability of cellulose, and ensures the
preservation of the composite functionalities even upon removal of
the surface layers through mechanical scratching. The photochromic
spiropyran moieties of the polymer, even while embedded in the cellulosic
sheet, can reversibly interconvert between the colorless spiropyran
and the pink merocyanine isomeric states upon irradiation with UV
and visible light, respectively. Moreover, the photochromic polymer
presents a faster photochromic response and a higher resistance to
photodegradation, with an outstanding reusability for more than 100
switching cycles when it is incorporated in the cellulose network.
Most importantly, the acidochromism of the modified FP, attributed
to the spiropyran molecules after UV activation, allows the real-time
optical and visual detection of acidity changes and spoilage in food
products, such as wine and milk. Spoilage due to bacterial degradation
and oxidation processes generates acidic vapors that induce the protonation
of the merocyanine. This results in a visually detectable chromic
transition from pink to white of the treated cellulose fibers, corresponding
to a blue shift in the absorption spectrum. The developed photoresponsive
cellulose composite can serve as cost-effective robust optical component
in integrated functional platforms and consumer-friendly indicators
for smart food packaging, as well as portable on demand acidoresponsive interfaces for gas monitoring in industrial and
environmental applications.
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Genovese, Maria E.; Abraham, Sinoj; Caputo, Gianvito; Nanni, Gabriele; Kumaran, Surjith K.; D. Montemagno, Carlo; et al. (2018). Photochromic Paper Indicators for Acidic Food Spoilage
Detection. ACS Publications. Collection. https://doi.org/10.1021/acsomega.8b02570
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AUTHORS (8)
MG
Maria E. Genovese
SA
Sinoj Abraham
GC
Gianvito Caputo
GN
Gabriele Nanni
SK
Surjith K. Kumaran
CD
Carlo D. Montemagno
AA
Athanassia Athanassiou
DF
Despina Fragouli
KEYWORDS
photoresponsive microstructuredUV activationgas monitoringfood productsmerocyanine isomeric statesacidity changesPhotochromic Paper Indicatorsreversibly interconvertabsorption spectrumphotochromic polymerphotochromic spiropyran moietiesoxidation processesdemand acidoresponsive interfacescellulose networkAcidic Food Spoilage Detectioncellulosic filter paperfood packagingpolymer enwrapscellulosic sheetconsumer-friendly indicatorsFPphotochromic responsespiropyran-modified acrylic polymerspiropyran moleculessurface layersacidic vaporscellulose fiberscellulose fiberphotoresponsive cellulose