Licenciatura em Química (Sede)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/26
Siglas das Coleções:
APP - Artigo Publicado em Periódico
TAE - Trabalho Apresentado em Evento
TCC - Trabalho de Conclusão de Curso
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Resultados da Pesquisa
Item Composição química, atividade inseticida e potencial antioxidante dos óleos essenciais das folhas e flores de Plumeria pudica Jacq(2022-09-30) Arcelino, Ariadna Isis Oliveira de; Moraes, Marcílio Martins de; http://lattes.cnpq.br/0321382004671685; http://lattes.cnpq.br/0321382004671685Agricultural producers usually suffer from the attack of pest insects that cause great damage to plantations, among these insects is Plutella xylostella, popularly known as cruciferous moth, as it usually attacks Brassicas plantations, this pest has already caused a global damage of about of US$ 4 billion. Currently, the control of this pest is carried out with commercial insecticides, but the excessive use of these products tends to cause greater resistance of the pest, in addition to contaminating soil, rural workers and mammals. With that, seeing being studied the use of natural products such as extract and essential oil of plants, as an alternative for the control of these agricultural pests, since these materials have in their chemical composition secondary metabolites with high toxicity to insect pests without causing damage to the environment, workers and consumers. The present work analyzed the chemical composition of the essential oil of the leaves and flowers of Plumeria pudica in order to evaluate its chemical composition and insecticidal and antioxidant properties. The analysis by gas chromatography coupled with mass spectrometry (GC-MS) revealed the presence of 8 and 13 compounds in the essential oil of leaves and flowers, respectively. The major compounds identified were (2E)-hexenal (40.67%) and lauric acid (39.97%) for leaves and flowers, respectively. The toxicity bioassay was carried out through residual contact and direct contact with the oil of P. pudica flowers with concentrations of 10μL/mL and 15μL/mL on P. xylostella, for the test using residual contact the oil did not show toxicity, on the other hand, using direct contact, the concentration of 10μL/mL showed a toxicity of 92% and 15μL/mL of 93.10%. In the antioxidant tests it was found that the two oils were active both in the ABTS and DPPH test. In the antioxidant tests, it was found that the oils from the leaves and flowers were active both in the ABTS test and with DPPH. For the acetylcholinesterase (AChE) inhibition test, the oils from the leaves and flowers of P. pudica were used, both oils showed inhibition, and the flower oil showed the closest inhibition to the positive control with an IC50 of 9 .94 mg/ml. The cytotoxicity assay against Artemia salina was also performed with the oils of leaves and flowers with concentrations between 10-100μg/mL and both showed no toxicity.Item Análise comparativa do potencial inseticida dos óleos essenciais das folhas e frutos de Melaleuca leucadendra sobre a traça das crucíferas (Plutella xylostella)(2019-06-28) Santos, Rodrigo Bastos dos; Camara, Cláudio Augusto Gomes da; http://lattes.cnpq.br/5615678215435460; http://lattes.cnpq.br/3667225401473912The objective of this work is to investigate the insecticidal potential of the essential oils of the different parts of Melaleuca leucadendra, on the cruciferous moth, Plutella xylostella, contributing to the studies aimed at botanical insecticides. To this end, we analyzed comparatively the insecticidal activity of the leaf and fruit oils of M. leucadendra on P. xylostella by means of the larvicide toxicity bioassays and embryocid toxicity, also comparing its results with the insecticide Azamax® Commercial. The OEs obtained for leaves and fruits of M. leucadendra, presented yield of 0.28% ± 0.05 and 0.18% ± 0.03 respectively, being all in acceptable standards for plants producing essential oils. As the majority constituent of these oils, sesquiterpene (E)-nerolidol in concentrations above 90% was characterized in both parts. The results obtained through the larvicide toxicity Bioassay showed a lethal mean concentration of 0.15 mg/mL and 0.17 mg/mL for the oils of the fruits and leaves of M. leucadendra, respectively, but not statistically different. For the experiments carried out on the embryonic phase of P. xylostella, again there was no statistical difference, showing LC50 of 0.23 mg/mL and 0.28 mg/mL for leaf and fruit oils, respectively. Both essential oils, as well as the majority constituent, presented higher toxicity on the cruciferous moth than the commercial insecticide Azamax® (LC50 = 2,75 mg/mL and LC50 = 2,57 mg/mL on the larvae and eggs, respectively), showing promising in the control of the Plutella xylostella.