Banca de DEFESA: SUELLEN ROCHA VIEIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : SUELLEN ROCHA VIEIRA
DATA : 10/02/2021
HORA: 14:00
LOCAL: Faculdade de Farmácia
TÍTULO:

OBTAINING, CHARACTERIZATION AND APPLICATION OF CELLULOSE NANOPARTICLES OBTAINED WITH IONIC LIQUID

PALAVRAS-CHAVES:

Biodegradable packaging, nanoparticles, cellulose, cellulose dissolution, starch, chitosan, bionanocomposites.

PÁGINAS: 103
GRANDE ÁREA: Ciências Agrárias
ÁREA: Ciência e Tecnologia de Alimentos
SUBÁREA: Ciência de Alimentos
ESPECIALIDADE: Química, Física, Fisico-Química e Bioquímica dos Alim. e das Mat-Primas Alimentares
RESUMO:

Starch and chitosan films are promising alternatives for the packaging industry, however, they have limitations regarding their properties. An alternative to improve the characteristics is the incorporation of cellulose nanoparticles obtained by reusable solvents such as ionic liquid (LI). The aim of this study was to produce and characterize cellulose nanoparticles (NPC-DM) using microcrystalline cellulose (MCC) and LI (3-dimethylamino-1-propylammonium hexanoate - DMAPA [Hex]) and incorporate them in starch bionanocomposite films of cassava (4% w / v) and chitosan (2% w / v), using glycerol (25% w / w of starch and 30% w / w of chitosan) as plasticizer. The NPC-DM were evaluated for yield, Zeta potential, X-ray diffraction (XRD), transmission electron microscopy (MET), thermogravimetric analysis (TG) and infrared spectroscopy (FTIR). The NPC-DM were incorporated into matrices of cassava starch and chitosan in different concentrations (0.1; 0.2 and 0.3% of NPC-DM) and films without the addition of nanoparticles were used as controls. Bionanocomposites made by casting were evaluated for thickness, humidity, optical properties, water vapor permeability (PVA), mechanical properties and thermogravimetric analysis. The NPC-DM showed a yield of 27.82%, Zeta potential of -9.9 mV, crystallinity index of 67.6%, average crystal size of 5.01 nm, length of 320 ± 24 nm, diameter of 35 ± 15 nm and aspect ratio of 9.14. In addition, they were thermally stable and with a structure similar to MCC, indicating efficiency in the dissolution process with LI DMAPA [Hex]. The incorporation of different concentrations of NPC-DM did not change the thickness, moisture content and thermal stability for the two polymeric matrices, however, it did change the optical properties statistically. The incorporation of 0.2 and 0.3% of NPC-DM significantly reduced (P <0.05) the PVA in the two matrices (49.1% starch and 25.6% chitosan), compared to the control. In the starch matrix, the incorporation of NPC-DM decreased the tensile strength, Young's modulus and increased the elongation at break, compared to the control. However, for the chitosan matrix, the lowest concentrations (0.1 and 0.2%) of NPC-DM did not affect the tensile strength and elongation at break, compared to the control. It was possible to evaluate the use of LI DMAPA [Hex] as an alternative route for the production of NPC-DM, which when incorporated into bionanocomposite films, improve the barrier properties and change the mechanics depending on the polymeric matrix.

MEMBROS DA BANCA:
Presidente - 4725209 - CAROLINA OLIVEIRA DE SOUZA
Externo(a) à Instituição - DENILSON DE JESUS ASSIS - UNIFACS
Externo(a) à Instituição - JAMILLE SANTOS SANTANA - IFBA