Pectin-based color indicator films incorporated with spray-dried Hibiscus extract microparticles

Author(s)

Mendes, Juliana Farinassi ; Norcino, Lais Bruno ; Manrich, Anny ; de Oliveria, Tiago Jose Pires ; Mendes, Rafael Farinassi ; Mattoso, Luiz Henrique Capparelli

• Document type: Journal article
• Source: Food Research International; v. 162, p. 15-pg., 2022-12-01.

Abstract

Colorimetric films incorporated with anthocyanins as an indicator for freshness monitoring have aroused growing interest recently. The pH-sensing colorimetric film were developed based on pectin (HM), containing aqueous hibiscus extract microparticles (HAE). HAE microparticles were obtained by spray drying with different wall materials (Inulin-IN, maltodextrin-MD and their combination). The films were obtained on large scale by continuous casting. These films were characterized for physicochemical analysis, morphological structure, thermal and barrier properties, antioxidant activity, and color change at different pH. The addition of HAE microparticles caused relevant changes to HM-based films, such as in mechanical behavior and improved barrier property (11-22% WVTR reduction) depending on the type of wall material used and the concentration added. It was verified with the thermal stability of films, with a slight increase being observed. The color variation of smart films was entirely pH-dependent. Overall, the proposed color indicator films showed unique features and functionalities and could be used as an alternative natural pH indicator in smart packaging systems. (AU)

• FAPESP's process: 19/26622-4 - Development of nanostructured dressings containing antimicrobial agents aiming at tissue engineering applications in cattle
• Grantee: Juliana Farinassi Mendes
• Support Opportunities: Scholarships in Brazil - Post-Doctoral