Banca de QUALIFICAÇÃO: RENNAN FELIX DA SILVA BARBOSA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : RENNAN FELIX DA SILVA BARBOSA
DATA : 11/03/2020
HORA: 13:30
LOCAL: sala 303, 3º andar, Bloco B, Campus SA da Fundação Universidade Federal do ABC, localizada na Avenida dos Estados, 5001, Santa Terezinha, Santo André, SP
TÍTULO:

Development of active biodegradable polymeric films containing essential oil capsules and cellulose nanostructures

PÁGINAS: 130
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
RESUMO:

Given the growing need for the food packaging industry to have products with antimicrobial properties to increase food safety and quality, this paper aims to produce flexible biodegradable polymeric films with incorporation of cellulose nanostructures, and with antimicrobial properties. encapsulation and controlled release of active ingredients in essential oils. Cellulose nanostructures (NECs) were obtained from eucalyptus residues after alkaline treatment to remove non-cellulosic components and subsequent mechanical grinding. The encapsulation was performed using the polysorbate 80 surfactant to produce a stable emulsion, and subsequent deposition of polymeric solution with precipitation of polymeric capsules. The essential oils of Ho Wood and Cinnamon Cassia were used, containing as main components linalol and cinnamaldehyde, respectively. The polymeric films were then produced with the incorporation of cellulose nanostructures and capsules developed by means of casting, with tip ultrasonic dispersion. NECs were evaluated for structural (FTIR, XRD), dimensional (DLS and SLS), thermal (TGA), stability (Zeta potential), compositional (TAPPI) and morphological (SEM) properties. The capsules were evaluated for dimensional (DLS, SLS), morphological (SEM) properties, encapsulation efficiency, release profile and antimicrobial activity. The developed films were evaluated for mechanical (tensile test), thermal (TGA), and contact angle properties. The results showed that the treatment was effective to remove lignin and hemicellulose from eucalyptus fibers. The results indicate good removal of non-cellulosic components and obtaining nanometric structures (~ 98nm). The obtained capsules presented spherical geometry with sizes from 100 to 250 nm, but with tendency to agglomeration in larger structures. A high encapsulation efficiency of around 74% was observed, with a release profile that follows the Korsmeyer-Peppas model. The produced capsules showed antimicrobial activity, especially the capsules containing cinnamon oil, which presented lower inhibitory concentrations. The developed films showed mechanical gain with the incorporation of NECs. The results indicate the potential of the system developed for the production of active biodegradable films.

MEMBROS DA BANCA:
Presidente - Interno ao Programa - 1761120 - DANILO JUSTINO CARASTAN
Membro Titular - Examinador(a) Interno ao Programa - 052.991.506-52 - JULIANA DA SILVA BERNARDES - UNICAMP
Membro Titular - Examinador(a) Externo à Instituição - LEDA COLTRO
Membro Suplente - Examinador(a) Interno ao Programa - 1734908 - FABIO FURLAN FERREIRA
Membro Suplente - Examinador(a) Interno ao Programa - 1707133 - ISELI LOURENCO NANTES CARDOSO
Membro Suplente - Examinador(a) Externo ao Programa - 1850090 - ANNE CRISTINE CHINELLATO