Banca de DEFESA: CÁSSIA CARINE MORAIS DOS SANTOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : CÁSSIA CARINE MORAIS DOS SANTOS
DATE: 28/07/2023
TIME: 19:00
LOCAL: via googlemeet
TITLE:

Phytochemical study of species of the genus Protium and its use as an alternative source of insecticides for the control of Plutella xylostella

KEY WORDS:

Insecticidal potential; Chemical composition; Antioxidant activity; Essencial oils; Protium; Plutella xylostella

PAGES: 65
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Orgânica
SPECIALTY: Química dos Produtos Naturais
SUMMARY:

Plutella xylostella L. is one of the main agricultural pests that attacks cruciferous crops around the world. This pest has developed resistance against almost all commercial chemical insecticides, making it one of the most problematic field pests in Brazil. The species Brassicas oleracea L. of the brassicaceae family is the main target of this pest, as it affects cabbage, broccoli and kale plantations, causing damage to the final product. Because of this, there is a battery of insecticide applications for its control, causing damage to the producer, contamination above the limit allowed in food and soil. Natural essential oils from plants can be a safe alternative for agricultural pests. The development and production of essential oils lessens the negative effects of synthetic chemicals. This work aims to investigate the insecticidal potential of essential oils from the leaves of different species of Protium, on the cruciferous moth, Plutella xylostella, in addition to reporting its antioxidant action and chemical composition. The oils exhibited yields ranging from 0.04% to 0.30%, in addition to being identified with a high sesquiterpene profile. Spathulenol (32.76%) was identified as the major constituent in the oil of P. aracouchine, whereas β-caryophyllene was the main constituent in the oil of P. giganteum (27.70%) and P. heptaphyllum (22.38%). Caryophyllene oxide (46.0%) was identified as the main constituent of P. ovatum oil. Bicyclogermacrene was identified as the main constituent of the oils of P. grandifolium (26.77%) and P. tenuifolium (23.98%). In the DPPH˙ test, P. heptaphylum oil showed a greater potential for antioxidant activity. For the test with the ABST˙+ radical, P. giganteum oil was the most promising among the other oils. The results obtained through the larval toxicity bioassay showed that the oils of P.ovatum, P. aracouchine and P. giganteum were toxic against P. xylostella larvae. The oil from the leaves of P. ovatum was 3 times more toxic compared to the other analyzed oils.

COMMITTEE MEMBERS:
Presidente - CLAUDIO AUGUSTO GOMES DA CAMARA
Interno - JOAO RUFINO DE FREITAS FILHO
Externa à Instituição - CAROLINA ALVES DE ARAUJO