A pH AND NH3 COLORIMETRIC INDICATORS BASED ON EXTRACT OF AÇAI ANTHOCYANINS INTO CELLULOSE ACETATE FOR INDICATING THE FRESHNEES SHIRIMP

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Detalles
  • Tipo de presentación: Pôster
  • Eje temático: Segurança Alimentar e a Ciência de Alimentos (SCA)
  • Palabras clave: anthocyanin; Shrimp; Indicator;
  • 1 Laboratory of Food Packaging, Department of Food Technology, Federal University of Viçosa
  • 2 Departament of Materials Science and Engineering, Federal University of São Carlos
  • 3 Laboratory of Pigments and Bioactive Compounds, Department of Food Technology, Federal University of Viçosa

A pH AND NH3 COLORIMETRIC INDICATORS BASED ON EXTRACT OF AÇAI ANTHOCYANINS INTO CELLULOSE ACETATE FOR INDICATING THE FRESHNEES SHIRIMP

Samiris Côcco Teixeira

Laboratory of Food Packaging, Department of Food Technology, Federal University of Viçosa

Resúmenes

The colorimetric indicators have the ability to indicate, in real time, the conservation status of food products and, therefore, present great potential for use as a tool to reduce food waste. Knowing that plasticizers may influence the chromic capacity of indicator substances added in polymeric bases, colorimetric indicators were produced by incorporating açaí anthocyanins extract (AE) in cellulose acetate (CA), added to different concentrations (1.8; 3.6; 5.4; 7.2 mols) of the plasticizers: glycerol (GLI) and triethyl citrate (TEC). The AE, adjusted at different pH values (2-12), was characterized by visible ultraviolet spectrometry. Plasticized colorimetric indicators were produced by the solvent evaporation method, on polymeric dispersion of CA in acetone at a ratio of 1:10 (w/v). The samples were analyzed by infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and by colorimetric and visual analysis under exposure to ammonia vapors, and to solutions at different pH's. In addition the sensors were analyzed for color change in real time on shrimp samples. The immobilization of plasticizers in the CA polymer matrix was confirmed by means of FT-IR spectra and SEM micrographs. The study of the chromatic behavior of the colorimetric indicators, produced with 7.2 mols of GLI and 1.8, 3.6 and 7.2 mols of TEC, under simulated condition, by exposure to ammonia vapors, exhibited more visually perceptible color changes. While the evaluation of the chromatic behavior on exposure to NaOH basic solution, showed that the indicators plasticized with GLI, exhibited better responses. With the results of the shrimp application analysis, it was found that colorimetric indicators incorporated with plasticizers can be used as a tool to effectively monitor shrimp freshness in real time. Furthermore, the color changes observed in the study were easily distinguished with the naked eye, suggesting their potential for use as smart packaging.

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