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Projeto de investigação
Fiber Materials and Environmental Technologies
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Publicações
Production and characterization of pullulan/paper/zein laminates as active food packaging materials
Publication . Bilohan, Mariya; Ramos, Ana; Domingues, F.C.; Luís, Ângelo
Pullulan/paper/zein laminates were developed as food packaging materials with active properties, taking advantage of the hydrophilic character of the pullulan where the rockrose essential was incorporated as a bioactive agent to be more easily released into the packaged food; paper improved the general mechanical properties of the developed materials; and the hydrophobic nature of zein improved the barrier properties of the developed materials. A cohesive microstructure without a clear boundary between the three layers was visualized by Scanning Electron Microscopy, which proves the good adhesion between them. It was found that the incorporation of rockrose essential oil significantly improves the ability of the laminates to inhibit lipid peroxidation. Thus, the potential for application of the developed laminates as new food packaging materials was confirmed, considering their ability to inhibit and/or prevent oxidation and lipid peroxidation and thereby increase the shelf life of the packaged food. The laminates also presented antimicrobial activity, specifically against Gram-positive strains. After 7 days of storage of fresh ham slices packaged with the developed laminates, it was observed that the texture parameters (shear force and shear energy) increased significantly in pullulan/paper/zein packages with and without the incorporation of rockrose essential oil.
Production and Characterization of a Pullulan-Based Facial Mask Incorporating Grape Seed Flour Extract for Cosmeceutical Applications
Publication . Ferreira, Ester; Encarnação, Bárbara; Cascalheira, José Francisco; Ferreira, Susana; Ramos, Ana; Luís, Ângelo; Gallardo, Eugenia; Domingues, Fernanda; Magni, Chiara
This study aimed to develop and characterize an eco-friendly facial mask based on the pullulan biopolymer incorporating grape seed flour extract, a sustainable source of polyphenols. The extract was characterized by its phenolic content, antioxidant capacity, enzyme inhibition and antimicrobial activity. High total phenolic and flavonoid contents, along with the presence of -resveratrol, conferred strong antioxidant activity. The extract effectively inhibited tyrosinase and elastase enzymes, indicating its anti-aging potential, and exhibited antimicrobial effects particularly against . The incorporation of the extract in pullulan films increased thickness and coloration while maintaining transparency and improving barrier properties. The bioactive films showed strong antioxidant activity and displayed selective antibacterial activity against , including MRSA strains. A facial mask prototype was successfully produced, demonstrating flexibility, solubility, and potential for topical applications. Overall, the developed pullulan-grape seed extract films exhibit multifunctional cosmeceutical potential combining antioxidant, antimicrobial, and anti-aging effects with sustainable valorization of wine industry by-products.
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Entidade financiadora
Fundação para a Ciência e a Tecnologia
Programa de financiamento
6817 - DCRRNI ID
Número da atribuição
UID/Multi/00195/2013