Estrutura supramolecular entre 2-hidroxipropil-β-ciclodextrina e citral potencializa a atividade contra Rhipicephalus microplus (Acari: Ixodidae)

Detalhes bibliográficos
Ano de defesa: 2024
Autor(a) principal: Bigui, Walter Cesar Celeri
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso embargado
Idioma: por
Instituição de defesa: Universidade Federal do Espírito Santo
BR
Mestrado em Agroquímica
Centro de Ciências Exatas, Naturais e da Saúde
UFES
Programa de Pós-Graduação em Agroquímica
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: http://repositorio.ufes.br/handle/10/17949
Resumo: Rhipicephalus microplus is responsible for significant damage to global livestock, and the control of this parasite faces barriers such as acaricide resistance. Citral (CIT) is a potential acaricide; however, due to characteristics such as low volatility and water dispersibility, its field application is limited. The objective of this study was to prepare, characterize, and evaluate, in vitro, the acaricidal activity of the complex containing citral and 2-hydroxypropyl-β-cyclodextrin on R. microplus larvae. The complex (CIHβCIT) by kneading and the physical mixture (MFHβCIT) were prepared in a stoichiometric ratio of 1:1, confirmed by the solubility diagram and the Job Plot method. The intermolecular interaction between CIT and HPβCD was indicated, suggesting complex formation, confirmed by FTIR-ATR, TGA/DTG, DSC, XRD, and SEM. The kneading preparation method produced CIHβCIT with high yield (90.60%), encapsulation efficiency (72.03%), and drug loading of 6.48%. These parameters were determined through UV-Vis spectroscopy. The LC50 values obtained by the larval packet test for CIT, CIHβCIT, and MFHβCIT were 0.66%, 1.13%, and 1.16% (w/v), respectively. The formation of CIHβCIT reduced the volatility of CIT, maintaining acaricidal activity (81.59%) over 48 hours, compared to free CIT (64.61%) and MFHβCIT (60.86%). Thus, the preparation of CIHβCIT through the kneading technique is capable of enhancing and ensuring the acaricidal activity of CIT for an extended period