Preliminary assessment on the detection of putrescine using long period fiber gratings coated with titanium dioxide and poly(ethyleneco-vinyl acetate)

• Tipo: Artigo em Livro de Atas de Conferência Internacional
• Data: 2020

Autores

Vasconcelos, H (Autor) Outra; de Almeida, JMMM (Autor) FCUP; Saraiva, C (Autor) Outra; Viveiros, D (Autor) FCUP; Jorge, PAS (Autor) FCUP; Coelho, L (Autor) FCUP

Ata de Conferência Internacional

Título: OPTICAL SENSING AND DETECTION VI

Conference on Optical Sensing and Detection VI

ELECTR NETWORK, APR 06-10, 2020

Indexação

ISI Web of Knowledge - 1 Citação

Scopus - 2 Citações

Outras Informações

ID Authenticus: P-00R-Y3X

DOI: 10.1117/12.2555397

Abstract (EN): Biogenic amines, such as putrescine are potential indicators of food storage condition and deterioration. The real time measurement of their concentration in food may become an important method of food control. It was found that putrescine diffuses through a thin layer made from a solution of Poly(ethylene-co-vinyl acetate) (PEVA) and maleic anhydride. Poly(ethylene-co-vinyl acetate) is a common non-chlorinated vinyl capable to adsorb specific analytes as putrescine which upon diffusion, reversibly binds to the maleic anhydride causing the polymer swelling resulting in spectral changes from the optical point of view. Long Period Fiber Gratings coated with 30 nm titanium dioxide, a high refractive index material used to increase the intrinsic sensitivity to the external refractive index, were overcoated with a thin layer of maleic anhydride doped Poly(ethylene-co-vinyl acetate). When exposed to solutions containing small concentrations of putrescine the resonant band corresponding to the LP1,6 cladding mode was found to move to shorter wavelengths. The observed blue shift corresponds to the increasing concentration of putrescine in the fiber sensor structure. Further work is being carried out to improve the sensitivity and the limit of detection of the sensing system as well as to increase range of operation, which is presently limited to 0.3 to 0.5 M.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6