Detalhes bibliográficos
| Ano de defesa: |
2021 |
| Autor(a) principal: |
GALVÃO, Francielton Santos
 |
| Orientador(a): |
MAIA, José Guilherme Soares
|
| Banca de defesa: |
MAIA, José Guilherme Soares
,
ROCHA, Claudia Quintino da
,
OLIVEIRA, Patrícia Rosa de
|
| Tipo de documento: |
Dissertação
|
| Tipo de acesso: |
Acesso aberto |
| Idioma: |
por |
| Instituição de defesa: |
Universidade Federal do Maranhão
|
| Programa de Pós-Graduação: |
PROGRAMA DE PÓS-GRADUAÇÃO EM QUÍMICA/CCET
|
| Departamento: |
DEPARTAMENTO DE QUÍMICA/CCET
|
| País: |
Brasil
|
| Palavras-chave em Português: |
|
| Palavras-chave em Inglês: |
|
| Área do conhecimento CNPq: |
|
| Link de acesso: |
https://tedebc.ufma.br/jspui/handle/tede/3833
|
Resumo: |
Dizygostemon riparius Scatinga & Colletta (Plantaginaceae) is the second species of the genus reported for Northeastern Brazil. It is an aromatic sub-shrub up to 50 cm, endemic to the municipality of São Benedito do Rio Preto, the eastern region of the State of Maranhão, Brazil, locally known as “Melosa”. The present work aimed to evaluate the seasonal and circadian influence on the composition of the essential oil of D. riparius. In the circadian study, the collection of the aerial part of the plant was carried out in the periods of 6 am, 9 am, 12 pm, 3 pm, and 6 pm, in November/2019 (dry season) and May/2020 (rainy season), with an average oil yield of 0.8 mL, while seasonally samples were collected at 9 am, from August/2019 to July/2020, with an average oil yield of 2.0 mL. The oils from the dry aerial parts of the plant were hydrodistilled and analyzed by gas chromatography, with a flame ionization detector (GC-DIC) and a mass spectrometry detector (GC-MS). The analysis of the oils identified 62 constituents, representing about 96% of the total composition. The oil yield and composition did not show a significant correlation (p˃ 0.05) with the climatic parameters (air relative humidity, precipitation, solar radiation, and temperature), but its major components, the oxygenated monoterpenes endo-fenchyl acetate (30.51-42.09%) and endo-fenchol (31.29-37.36%) influenced their seasonal percentages due to precipitation and solar radiation. There was only quantitative variation in the composition of oils in the dry and rainy seasons in the circadian rhythm, justified by multivariate analyses (Hierarchical Cluster Analysis - HCA and Principal Component Analysis - PCA). The results of this work contribute to establishing a seasonal and circadian database of aromatic plants and fruits from the cerrado of Maranhão, expanding scientific knowledge, and providing essential data for the economic use of Dizygostemon riparius, which occurs in Eastern Maranhão state. |
