Composition of epicuticular wax layer of two species of Mandevilla (Apocynoideae,Apocynaceae) from Rio de Janeiro,Brazil |
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Authors: | Sandra Zorat Cordeiro Naomi Kato Simas Rosani do Carmo de Oliveira Arruda Alice Sato |
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Institution: | 1. Universidade Federal do Rio de Janeiro (UFRJ), Av. Carlos Chagas Filho, s/n – CCS, Bloco K, sala K2-032, Cidade Universitária, Rio de Janeiro – RJ 21941-902, Brazil;2. Laboratório de Fitoquímica, Curso de Farmácia, Universidade Federal do Rio de Janeiro (UFRJ), Campus Macaé, Av. Aluizio da Silva Gomes, 50 – Granja dos Cavaleiros - Macaé - RJ 27930-560, Brazil;3. Laboratório de Anatomia Vegetal, Departamento de Biologia, Universidade Federal do Mato, Grosso do Sul (UFMS), Campus de Campo Grande, s/n – Cidade Universidade, CCBS, Campo Grande - MS 79070-900, Brazil;4. Laboratório de Cultura de Tecidos Vegetais, Departamento de Botânica, Universidade Federal do Estado do Rio de Janeiro (UNIRIO), Av. Pasteur 458 – CCBS, sala 414, Rio de Janeiro - RJ 22290-040, Brazil |
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Abstract: | The chemical composition of epicuticular waxes of Mandevilla guanabarica and Mandevilla moricandiana was comparatively analyzed by extraction in n-hexane and chloroform. The mean wax content per unit of leaf area in the n-hexane extract was about 13–30 μg cm−2 for M. guanabarica, containing 20–28% n-alkanes and 55–63% triterpenes; for M. mori-candiana, the mean content was 19 μg cm−2, containing 73% n-alkanes and 14% triterpenes. In the chloroform extract, the wax yield was 40–80 μg cm−2 for M. guanabarica, with about 9–11% n-alkanes and 75–82% triterpenes; while for M. moricandiana, the wax yield was 110 μg cm−2, with 52% n-alkanes and 14% triterpenes. The major compounds identified were lupeol, pentacyclic triterpenes of the α- and β-amyrin class, and n-alkanes such as nonacosane, hentriacontane and tritriacontane. These results indicate that the quantitative chemical profiles of epicuticular waxes of M. guanabarica and M. moricandiana are distinct and could be used as an additional feature in taxonomic identification. |
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Keywords: | Mandevilla Apocynaceae Epicuticular waxes Chemotaxonomy |
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