Banca de QUALIFICAÇÃO: BEATRIZ MENEGHETTI COSTA DE ARAÚJO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : BEATRIZ MENEGHETTI COSTA DE ARAÚJO
DATE: 23/07/2025
TIME: 14:30
LOCAL: Via Google Meet
TITLE:

Valorization of lignin from green coconut: Production of nanoparticles for encapsulation of bioactives and immobilization of lipases with lignosulfonate

KEY WORDS:

lignin; green coconut; nanoparticles; lignosulfonate; encapsulation; enzyme immobilization

PAGES: 42
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Processos Industriais de Engenharia Química
SPECIALTY: Processos Bioquímicos
SUMMARY:

The valorization of agro-industrial waste, such as green coconut fiber, offers sustainable opportunities for the development of high-value-added products. Rich in lignin, this biomass allows for the production of functional materials with broad applicability. This proposal aims to extract and modify lignin from green coconut for two main purposes: (i) production of nanoparticles for encapsulation of bioactives and (ii) production of lignosulfonate (LS), which acts as a surfactant in the immobilization and hyperactivation of lipases. The lignin will be extracted after alkaline pretreatment and subsequently used for nanoparticle synthesis by antisolvent precipitation and spray drying, and for quercetin encapsulation, evaluating the influence of operating conditions on encapsulation efficiency. Subsequently, the controlled-release profile will be evaluated. The samples will be characterized by techniques such as FTIR, XRD, TG, and TEM. In parallel, lignosulfonate will be obtained by sulfomethylation and applied to lipase immobilization systems (CALB and Eversa) in three different ways: magnetic CLEAs, hybrid nanoflowers, and chitosan supports. The effect of the biosurfactant on the catalytic activity of the enzymes will be investigated. The lignosulfonate-immobilized materials will be evaluated based on their thermal stability, reusability, and enzymatic activity, and the results will be compared with the values obtained without the addition of LS and with the addition of commercial surfactants listed in the literature (CTAB and Triton). The proposal addresses two innovative contributions to bioactive encapsulation and biocatalysis, combining technical feasibility, environmental relevance, and industrial potential, contributing to the efficient use of lignin as a renewable raw material.

COMMITTEE MEMBERS:
Presidente - 1346198 - EVERALDO SILVINO DOS SANTOS
Interno - ***.656.434-** - CARLOS EDUARDO DE ARAÚJO PADILHA - UFRN
Interna - 3214434 - NATHALIA SARAIVA RIOS