Banca de DEFESA: VALÉCIA NOGUEIRA SANTOS E SILVA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : VALÉCIA NOGUEIRA SANTOS E SILVA
DATA : 01/12/2023
HORA: 13:00
LOCAL: Google Meet
TÍTULO:

USE OF NON-THERMAL TECHNIQUES FOR BIOFORTIFICATION AND VALUE ADDED IN MINIMALLY PROCESSED SWEET POTATOES

PALAVRAS-CHAVES:

Ipomoea batatas, Phosphorus, Melatonin, Conservation.

PÁGINAS: 102
RESUMO:

Pre- and post-harvest practices can alter the quality of sweet potato roots, influencing their storage capacity. Phosphate fertilizer is one of the important pre-harvest factors to modulate some physiological disorders and biosynthesis of bioactive compounds in sweet potato post-harvest after being minimally processed, and the application of melatonin to promote accumulation of antioxidant compounds. The objective of this study was to evaluate the quality and post-harvest conservation of minimally processed sweet potato roots cultivated in the northeastern semi-arid region with different levels of phosphate fertilizer and application of exogenous melatonin. In the first experiment, five doses of phosphorus (0; 60; 120; 180 and 240 kg ha-1 P2O5) were applied to the Paraná cultivar. The second experiment was with the application of melatonin to sweet potatoes with different flesh colors (white and orange), associated with minimal processing technology. After harvesting, the roots were transported to the PGPV at UFRPE/UAST and subjected to minimal processing and maintained at 5 ± 2 °C. The experiments were conducted in DBC (experiment 1) and DIC (experiment 2). The first experiment was in a 5x7 factorial design, 5 doses of phosphorus and 6 days of evaluation (0, 4, 8, 12, 16 and 20 days) with three replications. The second experiment will be in a 4x6 factorial scheme, with 4 concentrations of melatonin (0; 10; 100 and 1000 μmol L-1) and 6 evaluation times (0; 4; 8; 12; 16 and 20 days) with three replications. O. The results were subjected to the Tukey test at 5% probability. The greater input of P into the soil increased the P content in roots and leaves and agroindustrial yield. Roots cultivated with P2O5 showed a higher content of hydrogen peroxide, phenolic compounds, vitamin C, yellow flavonoids, anthocyanins, carotenoids, antioxidant capacity by the DPPH method and increased activity of the enzymes polyphenol oxidase, peroxidase and phenylalanine ammonia-lyase. The application of exogenous melatonia maintained the quality of minimally processed sweet potatoes and showed a lower rate of browning, loss of fresh mass, lower content of phenolic compounds, hydrogen peroxide, lipid peroxidation, extravasation of electrolytes and lower activity of the enzymes peroxidase, polyphenoloxidase and phenylalanine ammonia lyase. In addition to having a higher vitamin C content and activity of the enzymes superoxide dismutase, catalase and ascorbate peroxidase. These results demonstrated the role of melatonia in protecting against oxidative damage due to the accumulation of antioxidant compounds, thus improving the physicochemical quality of minimally processed white and orange pulp sweet potatoes.

MEMBROS DA BANCA:
Externo à Instituição - DANIEL ALBERTO JACOBO-VELÁZQUEZ - PESQUISADOR
Externa à Instituição - GIUSEPPINA PACE PEREIRA LIMA - UNESP
Interno - ***.292.073-** - ADRIANO DO NASCIMENTO SIMÕES - UFRPE
Presidente - 1670421 - AURELIO PAES BARROS JUNIOR
Externo à Instituição - FLÁVIO PEREIRA DA MOTA SILVEIRA - PESQUISADOR
Externo à Instituição - FRED AUGUSTO LOUREDO DE BRITO - UFRPE