Browsing by Author "Carli, Cristiane de"
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- Desenvolvimento e caracterização de filmes comestíveis à base de quitosano incorporados com própolis para aplicação na conservação de alimentosPublication . Carli, Cristiane de; Falcão, Soraia; Santamaria-Echart, Arantzazu; Pereira, Celeide
- Production of chitosan-based biodegradable active films using bio-waste enriched with polyphenol propolis extract envisaging food packaging applicationsPublication . Carli, Cristiane de; Aylanc, Volkan; Mouffok, Kheira; Santamaria-Echart, Arantzazu; Barreiro, M.F.; Tomás, Andreia; Pereira, Celeide; Rodrigues, Paula; Vilas-Boas, Miguel; Falcão, SoraiaDeveloping biodegradable active films has been a promising green approach to overcoming global concerns over the environmental pollution and human health caused by plastic utilization. This study aimed to develop active films based on chitosan (CS), produced from waste crayfish (Procambarus clarkii) shells enriched with bioactive extract (5–20%) of propolis (PS) and to characterize its properties, envisaging food packaging applications. The chromatographic profile of PS extract confirmed its richness, with 41 phenolic compounds. With increasing extract addition to the chitosan, the thickness of the films increased from 61.7 to 71.7 μm, causing a reduction in the light transmission rate, along with a greenish colour shift. The interactions between PS extract and CS was confirmed by infrared spectroscopy, at the same time that the microstructural integrity of the films was checked on the scanning electron microscopy micrographs. The findings also showed that addition of PS enhanced the films thermal stability and mechanical properties e.g., tensile modulus, yield strength, and stress at break. Besides, it improved the antioxidant and antimicrobial activities. Overall, CS-based composite films seem a promising green alternative to petroleum-based synthetic plastics allowing to extend the shelf life of food products due to their eco-friendly nature.
- Propolis application in food preservation: development of chitosan-based edible filmsPublication . Carli, Cristiane de; Aylanc, Volkan; Santamaria-Echart, Arantzazu; Pereira, Celeide; Sousa, Miguel; Barreiro, M.F.; Rodrigues, Paula; Vilas-Boas, Miguel; Falcão, SoraiaEdible films derived from chitosan highlight for its potential as coating packages, due to their antimicrobial activity and low oxygen permeability, while propolis has shown effective as a natural additive due to its antimicrobial and antioxidant properties. Thus, its combination to produce edible films, provides a promising approach to enhance the life spam of easily perishable foods. The present study describes the development of edible films based on chitosan produced from chitin extracted crawfish shell, modified with propolis. Chitosan-based films prepared incorporating different concentrations of poplar propolis extracts (0% to 20%), where characterized by FTIR, TGA and SEM. Additionally, mechanical properties, water-solubility, colour and optical transmittance tests were performed to assess the film specificities. The antioxidant and antimicrobial activity of the coating were also studied. The FTIR spectra of the extracted material enable the identification of all major peaks associated to chitosan, corroborating the extraction procedure of chitin/chitosan from crawfish. The addition of propolis to the films decreased the water solubility compared to control. Besides, all films exhibited antioxidant and antimicrobial activity. The output clear indicates that films enriched with propolis may be an alternative candidate for food packing.