A Suitable Base Material for Composite Resin Restorations: Zinc Oxide Eugenol

Food and Chemical Toxicology 45 (2007) 1650–1661 www.elsevier.com/locate/foodchemtox

A comparison of chemical, antioxidant and antimicrobial studies of cinnamon leaf and bark volatile oils, oleoresins and their constituents q
Gurdip Singh b a,*

, Sumitra Maurya

a,1

, M.P. deLampasona b, Cesar A.N. Catalan

b

a Chemistry Department, DDU Gorakhpur University, Gorakhpur 273 009, India Instituto de Quimica Organica, Universidad Nacional de Tucuman, Ayacucho 471, S.M. de Tucuman 4000, Argentina

Received 31 August 2005; accepted 22 February 2007

Abstract The antioxidant, antifungal and antibacterial potentials of volatile oils and oleoresin of Cinnamomum zeylanicum Blume (leaf and bark) were investigated in the present study. The oleoresins have shown excellent activity for the inhibition of primary and secondary oxidation products in mustard oil added at the concentration of 0.02% which were evaluated using peroxide, thiobarbituric acid, p-anisidine and carbonyl values. Moreover, it was further supported by other complementary antioxidant assays such as ferric thiocyanate method in linoleic acid system, reducing power, chelating and scavenging effects on 1,1 0 -diphenyl-2-picrylhydrazyl (DPPH) and hydroxyl radicals. In antimicrobial investigations, using inverted petriplate and food poison techniques, the leaf and bark volatile oils has been found to be highly effective against all the tested fungi except Aspergillus ochraceus. However, leaf oleoresin has shown inhibition only for Penicillium citrinum whereas bark oleoresin has caused complete mycelial zone inhibition for Aspergillus flavus and A. ochraceus along with Aspergillus niger, Aspergillus terreus, P. citrinum and Penicillium viridicatum at 6 lL. Using agar well diffusion method, leaf volatile oil and oleoresin have shown better results in comparison with bark volatile oil, oleoresin and commercial bactericide, i.e., ampicillin. Gas chromatographic–mass spectroscopy studies on leaf

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