Banca de DEFESA: ISIS LINS DE CARVALHO PERALTA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ISIS LINS DE CARVALHO PERALTA
DATE: 24/03/2023
TIME: 08:00
LOCAL: SALA "B" DO IQB
TITLE:

Production of packaging for shrimps based on biocomposites (xanthan from Xanthomonas campestris/sodiumalginate/montmorillonite) and aqueous extract of oregano (Origanum vulgare L.)

KEY WORDS:

(Antioxidant; biofilms; active packaging; total phenols; mechanical properties)

PAGES: 80
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUMMARY:

("Active packaging" systems for food are based on the incorporation of components with properties that help in the process of controlling undesirable variations, such as antioxidants, antimicrobials, etc., in addition to adding environmental value (biodegradability, use of raw materials, residual raw materials, low toxicity). This work aimed to elaborate biocomposites with Xanthomonas campestris xanthan, sodium alginate and montmorillonite (MML) in the form of active films incorporated with aqueous extract of dehydrated oregano leaves (EAO), to package shrimp fillets. After testing various formulations with solutions of xanthan gum, sodium alginate and MML, the best combination was incorporated with different aliquots of EAO (mg/mL): 0.083; 0.0207; 0.0249; 0.0332; 0.0415; 0.622; 0.083; 0.012 and 0.016. The antioxidant capacity, the total phenolic content and the antimicrobial activity were tested in the EAO and in the different biofilms. Analyzes of color, thickness and mechanical properties of these films were also performed [elasticity (E), maximum stress (𝜎_𝑀𝐴𝑋), rupture stress (𝜎_𝑅𝑈) and deformation (D_MA)], in addition to their molecular characterization by infrared spectrophotometry (FTIR). The EAO and the biofilms incorporated with different aliquots of it showed antioxidant capacity against the DPPH radical (respectively 62% and about 45-85.5%), in addition to phenolic content justifying such action, however, they were not antimicrobial to P. aeuruginosa, E. coli and S. aureus. Color analysis (L*) revealed a tendency towards light colors, with the control biofilm (sodium alginate/xanthan) having yellowish tones. The FTIR absorbance values were (cm-1 ): 3422-3340, 2972, 1602, 1600, 1413, 1029, 950 and 81, confirming the chemical groups characteristic of the polymers used and the chemical interactions of the components. The average thickness of the films was 0.1 mm, and the tensile strength (𝜎_𝑅𝑈) changed according to the concentration of EAO incorporated. Preliminary results indicate that the biocomposites developed in this work have behaviors and functions that will allow them to be used as active food packaging.)

BANKING MEMBERS:
Interno(a) - 1543737 - ADRIANA SANTOS RIBEIRO
Externo(a) ao Programa - 3195712 - AMANDA LYS DOS SANTOS SILVA
Presidente - 1121343 - ANA MARIA QUEIJEIRO LOPEZ
Externo(a) à Instituição - JOHNNATAN DUARTE DE FREITAS