Banca de DEFESA: TAIS ANDREZA BATISTA DE JESUS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : TAIS ANDREZA BATISTA DE JESUS
DATE: 10/03/2026
TIME: 09:00
LOCAL: on line
TITLE:

EVALUATION OF THE CONCENTRATION BY NANOFILTRATION OF BLACKBERRY JUICE ON THE COMPOSITION AND BIOACCESSIBILITY OF ANTHOCYANINS

 

KEY WORDS:

Phenolic compounds; Membrane processes; Fruit juice; Physicochemical stability; In vitro digestion

PAGES: 30
BIG AREA: Ciências Agrárias
AREA: Ciência e Tecnologia de Alimentos
SUBÁREA: Tecnologia de Alimentos
SPECIALTY: Tecnologia de Produtos de Origem Vegetal
SUMMARY:

Blackberry is recognized for its high content of anthocyanins and other phenolic
compounds with functional potential; however, these compounds are sensitive to
processing, storage, and digestion conditions. This study aimed to evaluate the efficiency
of nanofiltration in concentrating bioactive compounds from blackberry juice using
different membrane configurations (tubular, spiral-wound, and plate-and-frame), as well
as to investigate the physicochemical stability of the concentrated product, the
bioaccessibility of phenolic compounds, and the effect of ascorbic acid addition. The juice
was previously centrifuged and subjected to nanofiltration processes, and
physicochemical parameters, total phenolic content, monomeric anthocyanins,
antioxidant activity (ABTS and DPPH), and color parameters (CIELAB) were evaluated
in the feed, permeate, and retentate fractions. The results demonstrated that the spiralwound nanofiltration membrane showed high efficiency in concentrating bioactive
compounds, particularly anthocyanins, with a concentration factor close to 2 for most
analytes, confirming the superior performance of this module. The concentrated juice
exhibited good physicochemical stability during frozen storage, preserving most of its
bioactive compounds for up to 60 days, with more pronounced reductions observed only
at 90 days. During simulated digestion, the presence of ascorbic acid did not promote
additional anthocyanin degradation and may have slightly enhanced their bioaccessibility.
The observed degradation was mainly attributed to the alkaline pH of the intestinal phase
and the intrinsic structural instability of anthocyanins. It is concluded that spiral-wound
nanofiltration represents a promising technological alternative for the development of
functional blackberry-based beverages with enhanced color intensity, bioactive
compound content, and storage stability.

 

COMMITTEE MEMBERS:
Presidente - ***.646.967-** - LOURDES MARIA CORRÊA CABRAL - EMBRAPA
Externa ao Programa - 2278527 - MONICA MARQUES PAGANI - UFRRJExterna à Instituição - ANA CAROLINA SAMPAIO DORIA CHAVES - EMBRAPA