Journal
FOOD BIOPHYSICS
Volume 17, Issue 1, Pages 59-74Publisher
SPRINGER
DOI: 10.1007/s11483-021-09700-z
Keywords
Biopolymers; Food packaging; Sensors; Methylcellulose; Crosslinking; Functionalization of polymers
Categories
Funding
- National Council for Scientific and Technological Development (CNPq) [160448/2018-2]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior -Brasil (CAPES) [001]
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This study evaluated the influence of MgCl2 and CaCl2 ionic strength and ionic radius on the physicochemical properties of methylcellulose-based films, and assessed the effect of IS on eco-friendly colorimetric sensors for ammonia vapor detection. The findings suggest that IS can be used as a tool to improve sensor sensitivity and detection limits, upgrading their quantification capacity.
The growing generation of petroleum-derived plastic waste has been boosting research in the development of biodegradable polymers, which can also be applied as eco-friendly polymeric matrices to colorimetric sensors. However, poor mechanical performance and the difficulty in controlling analyte detection sensitivity of these materials disadvantaged their use in this application. Therefore, this study aimed to evaluate the influence of MgCl2 and CaCl2 ionic strength (IS) and ionic radius (IR) on the physicochemical properties of methylcellulose-based films. This work also assessed the IS effect on ammonia vapor detection via eco-friendly colorimetric sensors made of methylcellulose-base. Films were characterized using ATR-FTIR, contact angle, SEM and profilometry, and mechanical, thermal, optical, and barrier properties were measured. Tensile strength and Young's modulus of the control film were 47 and 1090 mPa while increasing the IS to 500 mM using MgCl2 reduced the values to approximately 1.9 and 1.5 mPa, respectively. IS values below 50 mM caused crosslinking, while above that concentration the salts acted as a plasticizer. The salts' addition into the polymeric matrices dispersed better the polymeric network and increased methylcellulose films' flexibility. Also, changing the IS changed the intensity of the sensors' colorimetric response. Therefore, IS can be used as a tool to improve sensor sensitivity and detection limits, upgrading their quantification capacity. This discovery could lead to major advances in the optimization of colorimetric sensors so that the modulation of the precise moment of colorimetric change can be carried out using IS.
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