Chromatic sensor to determine oxygen presence for applications in intelligent packaging
| Autor: | Pilar Hernández-Muñoz, Virginia Muriel-Galet, Rafael Gavara, Gracia López-Carballo |
|---|---|
| Přispěvatelé: | Ministerio de Economía y Competitividad (España) |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Opacity Retortable Active packaging chemistry.chemical_element 02 engineering and technology lcsh:Chemical technology 01 natural sciences Biochemistry Oxygen Article Analytical Chemistry law.invention Light activation Oxygen sensor law lcsh:TP1-1185 Electrical and Electronic Engineering Instrumentation chemistry.chemical_classification business.industry 010401 analytical chemistry Polymer 021001 nanoscience & nanotechnology Intelligent packaging Atomic and Molecular Physics and Optics 0104 chemical sciences Methylene Blue Halogen lamp chemistry Photocatalysis Optoelectronics 0210 nano-technology business Layer (electronics) |
| Zdroj: | Sensors (Basel, Switzerland) Sensors, Vol 19, Iss 21, p 4684 (2019) Digital.CSIC. Repositorio Institucional del CSIC instname Sensors Volume 19 Issue 21 |
| Popis: | A chromatic sensor has been designed for the detection of oxygen in package headspace. The sensor is based on the redox change of methylene blue (MB) to its leuco form. Its formulation includes the pigment, glycerol, as a sacrificial electron donor, TiO, as a photocatalyst and ethylenevinyl alcohol copolymer (EVOH), as a structural polymer matrix. The final sensor design that allows its manufacture by conventional printing and laminating technologies consists of the sensing polymer matrix (MB-EVOH) sandwiched in a suitable transparent multilayer structure. The outer layers protect the sensor from the external atmosphere and allow visualization of the colour. The inner layer is sufficiently opaque to facilitate sensor reading from the outside, is thick enough to avoid direct contact with food (functional barrier), and is oxygen-permeable to expose the sensing material to the internal package atmosphere. In the absence of oxygen, the sensor becomes white by irradiation with halogen lamps in less than 60 s. All components are substances permitted for food contact except the pigment, but specific migration analysis showed no trace of migration thanks to the functional barrier included in the design. This research was funded by Spanish Ministry of Economy and Innovation, project AGL2015-64595-R and Juan y Juan S.L. |
| Databáze: | OpenAIRE |
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