Banca de QUALIFICAÇÃO: DANIEL SOUSA DOS SANTOS

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : DANIEL SOUSA DOS SANTOS
DATE: 26/03/2025
TIME: 09:00
LOCAL: Portaria CAPES No. 36, de 19/03/2020 - Banca virtual
TITLE:

POLY(VINYL ALCOHOL) FILMS LOADED WITH SILK FIBROIN AND COPAIBA OLEORESIN WITH POTENTIAL FOR APPLICATION IN BIOACTIVE PACKAGING

KEY WORDS:

Poly(vinyl alcohol); Copaiba oleoresin; Silk fibroin; Polymer films; Packaging material.

PAGES: 116
BIG AREA: Outra
AREA: Tecnologia e Inovação
SUMMARY:

Active biodegradable films have been receiving significant attention in the food industry as they offer an eco-friendly alternative to conventional packaging. Poly(vinyl alcohol) (PVA) is a biocompatible and biodegradable polymer with a high film-forming capacity, which has played an important role in packaging production. In parallel, copaiba oleoresin (CO) is a natural product with functional properties, such as antimicrobial activity, that can be incorporated into packaging. However, its lipophilicity makes it difficult to incorporate into hydrophilic films. To overcome this challenge and improve the miscibility of the film components, as well as extend the release time of the bioactive compound, emulsions based on silk fibroin (SF) and CO, referred to as SF‒CO, were used. Thus, we explored the development of biodegradable PVA films loaded with SF‒CO for potential use in active food packaging. The films were characterized, showing significant improvements in both their physicochemical properties and nanomorphology. Films containing 10% SF‒CO exhibited superior mechanical strength, with a Young’s modulus of 145 MPa and an elongation at break of 385%, compared to the control film with 42 MPa and 314%, respectively. The films also demonstrated barrier properties, with water vapor transmission rates (WVTR) as low as 25.95 g/h·m2. Antimicrobial activity against Staphylococcus aureus and Escherichia coli was significantly improved, showing inhibition zones of up to 10 ± 1 mm and a minimum inhibitory concentration (MIC) of 100 μg∙mL-1. 3D nanomorphological analysis via atomic force microscopy (AFM) showed increased roughness in films with higher SF‒CO content, with root mean square (RMS) roughness values ranging from 2.70 nm to 11.5 nm. These results highlight the potential of SF‒CO-loaded PVA films as robust, eco-friendly alternatives to conventional packaging materials. They provide improved mechanical and antimicrobial properties, essential for extending the shelf life of perishable foods and advancing sustainability in the packaging industry.

COMMITTEE MEMBERS:
Presidente - 1867989 - IRLON MACIEL FERREIRA
Externo à Instituição - Kelvi Wilson Evaristo Miranda - UEAP
Externo à Instituição - MÁRIO VANOLI SCATOLINO - UEAP