Banca de DEFESA: IVANA LAGO DA SILVA ROMÃO
Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.DISCENTE : IVANA LAGO DA SILVA ROMÃO
DATA : 30/06/2020
HORA: 09:00
LOCAL: SALA DE VIDEOCONFERÊNCIA DA PÓS GRADUAÇÃO
TÍTULO:
Strategies for characterizing the chemical composition of casearia fasciculata (glass fruit) using analytical techniques
PALAVRAS-CHAVES:
Casearia fasciculata, Biosorbent, Essential oil.
PÁGINAS: 104
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Química Analítica
ESPECIALIDADE: Métodos Óticos de Análise
RESUMO:
This publication presents an application of analytical techniques in the development of methods for the study of chemical composition of Casearia fasciculata. In the first work, a simultaneous quantification of 10 elements in Casearia fruits fasciculata by ICP OES was performed. A digestive method using diluted nitric acid was optimized by the design of the mixture for extracting elements in pulp, shell and seed of fascicula Casearia grown in the state of Bahia, Brazil. Four different approaches were used to evaluate the performance of the digestion procedure (I - Applied response; II - Desirability; III - Residual carbon content and IV - Residual acidity). The method quantification limits (µg g-1) were: Cr (0.42); Cu (0.69); Fe (1.5); Mn (0.14); Zn (1.8); Ca (29.0); K (3.5); Mg (1.9); P (6.4) and S (17). The digestion method was applied for the extraction of studied elements in two certified reference materials (RMAgro E1001a Brachiaria Brizantha and NIST 1515 Apple Leaves). As multivariate tools, PCA and HCA, they were efficient in forming groups, corresponding to the parts of the fruit. This study is the first to propose a simultaneous quantification of 10 elements in Casearia fruits fasciculata by ICP OES. No second work has evaluated the root potential of Casearia fasciculata plant for Mn (II) extraction in aqueous systems. A flow preconcentration system using a biosorbent-filled mini-column was developed and the main variables that interfere with the process (test solution pH, HCl eluent concentration, sample introduction leak, and eluate volume) collected) were optimized through the application of 24-1 factorial design and Doehlert matrix. The biosorbent also presented potential for remediation of Cd (II), Ni (II) and Pb (II) ions in aqueous medium. In addition, the flow system, associated with the FAAS technique, allowed a quick analysis, easy operation, efficient and sensitive for the species. No third work has been done in the extraction and identification of chemical components present in the essential oil of fasciculata Casearia aerial parts and their possible application as tick activity. The results shown that Casearia fasciculata essential oil extracted by hydrodistillation is composed of five sesquiterpenes. The major compounds used by CG-MS were: β-Elemene, (Trans)-β-Caryophyllene, Germacrene-D, Bicyclogermacrene and α- Bulnesene respectively. In the evaluation of oil as tick activity, oil has been shown to be an efficient tick agent against Rhipicephalus.microplus. The results proved by this plant have the potential of application in promising biological activities.
MEMBROS DA BANCA:
Presidente - 286034 - ANA MARIA PINTO DOS SANTOS
Interno - 1303987 - MARIA ELISABETE MACHADO
Interno - 670.936.635-91 - VALFREDO AZEVEDO LEMOS - UFBA
Interno - 318.201.155-34 - WALTER NEI LOPES DOS SANTOS - UFBA
Externo ao Programa - 1553300 - ANDERSON SANTOS SOUZA
Externo à Instituição - LIZ OLIVEIRA DOS SANTOS - UFRB
Externo à Instituição - CLEBER GALVAO NOVAES - UESB
Externo à Instituição - AMALIA GEIZA GAMA PESSOA - UFPB