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The Influence of Solvent and Extraction Time on Yield and Chemical Selectivity of Cuticular Waxes from Quercus suber Leaves
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Orientador(es)
Resumo(s)
The cuticular lipid compounds, usually named cuticular waxes, present in the cuticular
layering of Quercus suber adult leaves were extracted with solvents of different polarities (n-hexane,
dichloromethane and acetone) and analysed by GC–MS. Q. suber leaves have a substantial cuticular
wax layer (2.8% of leaf mass and 239 g/cm2), composed predominantly by terpenes (43–63% of all
compounds), followed by aliphatic long chain molecules, mainly fatty acids, and by smaller amounts
of aliphatic alcohols and n-alkanes. The major identified compound was lupeol (1.2% of leaves in
n-hexane extract). The recovery and composition of cuticular lipids depended on the solvent and
extraction time. The non-polar or weak polar solvents n-hexane and dichloromethane extracted
similar lipid yields (77% and 86% of the total extract, respectively) while acetone solubilised other
cellular compounds, namely sugars, with the lipid compounds representing 43% of the total extract.
For cuticular lipids extraction, solvents with a low polarity such as n-hexane are the more suitable
with an adequate extraction duration, e.g., n-hexane with a minimum extraction of 3 h
Descrição
Palavras-chave
cork oak cuticular wax solvents terpenes lupeol
Contexto Educativo
Citação
Simões, R.; Miranda, I.; Pereira, H. The Influence of Solvent and Extraction Time on Yield and Chemical Selectivity of Cuticular Waxes from Quercus suber Leaves. Processes 2022, 10, 2270
Editora
MDPI