Banca de DEFESA: JOYCE CHEVE DE SÁ

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JOYCE CHEVE DE SÁ
DATE: 17/05/2024
TIME: 13:00
LOCAL: Videoconferência em: https://meet.google.com/oih-tgos-gpz
TITLE:

Hermetia illucens L (Diptera, Stratiomyidae) as a sustainable source of chitin: extraction and characterization.

KEY WORDS:

Sustainability, polysaccharide, edible insect, Black Soldier Fly.

PAGES: 94
BIG AREA: Ciências Agrárias
AREA: Ciência e Tecnologia de Alimentos
SUBÁREA: Tecnologia de Alimentos
SPECIALTY: Tecnologia de Produtos de Origem Animal
SUMMARY:

In the face of the current scenario of food insecurity, Hermetia illucens L. (Diptera: Stratiomyidae), known as the Black Soldier Fly (BSF), is gaining global attention as an emerging and sustainable source for both human and animal feed. The BSF efficiently converts various organic biomasses into a chitin-rich biomass. Chitin, a polysaccharide, finds wide application in the food sector, including the production of films, coatings, antimicrobial action, emulsification, and stabilization. The extraction of chitin requires steps of demineralization and deproteinization, commonly carried out with environmentally hostile solvents such as HCl and NaOH. Consequently, chitin from the exuviae of Hermetia illucens pupae was obtained through more sustainable and economical processes, with demineralization carried out using acetic acid and hydrochloric acid at low concentrations (0.6 M), at room temperature (25 °C), and for a short period (2h). The obtained chitin was evaluated regarding its proximate composition (moisture, lipids, ashes, protein, acid detergent fiber (ADF), acid detergent lignin (ADL)), extraction efficiency, Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction, scanning electron microscopy (SEM), and thermal gravimetric analysis (TGA). The results indicated that acetic acid resulted in BSF pupal exuviae chitin with an ash content of 1.04%, a value significantly equal (p≤0.05) to chitin obtained with hydrochloric acid (0.79%) and commercial crustacean chitin (1.12%). These results provided a demineralization efficiency of 94.45% for acetic acid and 99.02% for HCl. There were no differences in the chemical and morphological structure of BSF chitin obtained with acetic and hydrochloric acids. Both samples were thermally stable, characterized as α-chitin, with a molecular structure and chemical composition typical of commercial chitin. The morphology of BSF chitins exhibited a hexagonal shape, unlike commercial crustacean chitin, which showed a rough structure. Thus, organic solvents produced chitin with quality comparable to that obtained using mineral solvents, opening new perspectives for the use of more sustainable solvents to replace minerals in the demineralization process of BSF pupal exuviae.

COMMITTEE MEMBERS:
Presidente - 2455049 - JOSE LUCENA BARBOSA JUNIOR
Externo ao Programa - 1899630 - VINICIUS PIMENTEL SILVA - UFRRJExterna à Instituição - CAROLINA OLIVEIRA DE SOUZA