Avaliação do efeito antifúngico de óleos essenciais por encapsulamento em ciclodextrina

: potencial de aplicação e efeitos de tratamento em pintura a óleo

Abstract

One of the main factors of the degradation of art work is biodeterioration, by microorganisms as filamentous fungi in various painting techniques, including oil painting on canvas. This project intended to evaluate the effect on the growth of selected fungal strains, namely Aspergillus sp., Penicillium sp. and Alternaria sp., through volatilization of antifungal compounds in essential oils, extracted from lavender, sage and basil encapsulated in cyclodextrin, as well as nonencapsulated sage. Antifungal activity was detected only in the application of non-encapsulated essential oil, and overall, the results of growth inhibition with encapsulated oils were not considerable. A suspension of spores from the strain of Penicillium sp. was placed over the mock paintings, to determine the growth inhibition ability of encapsulated basil essential oil, but due to a methodological matter, the results were not significant. Also, the effects of the volatile components of non-encapsulated sage essential oil were tested on the mock paintings, and the changes were evaluated by colorimetry, optical microscopy, FTIR and social inquiry. Such analyses have shown there are superficial changes in the chromatic layer, but no deeper changes were detected by FTIR analysis. Despite the results obtained, the potential application of essential oils for biodeterioration inhibition in oil painting was patent.

Date of Award	26 Jan 2017
Original language	Portuguese
Awarding Institution	Universidade Católica Portuguesa
Supervisor	Maria Aguiar (Supervisor) & Patrícia R. Costa (Co-Supervisor)