Composition of plant leaf wax, phase behavior of major components and effects of hydration

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Composition of plant leaf wax, phase behavior of major components and effects of hydration

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Publication Conference Paper, peer reviewed
Title Composition of plant leaf wax, phase behavior of major components and effects of hydration
Author(s) Fagerström, Anton ; Kocherbitov, Vitaly ; Westbye, Peter ; Bergström, Karin ; Mamontova, Varvara ; Engblom, Johan
Date 2013
Editor(s) Castelani, Priscila; Stock, David; Puente Moran, Diana
English abstract
The aim of this project was to characterize thermotropic phase behavior and morphology of major wax components of a plant leaf cuticle in dry and hydrated conditions. The composition of the cuticular wax from adaxial leaves of the plant Clivia Miniata Regel was characterized by GC-MS. The analysis showed that the wax is dominated by aliphatic compounds, mainly alkanes (C22-C33) and alcohols (C16-C32). Based on this analysis a model wax was composed comprising 1-docosanol (C22H45OH) and dotriacontane (C32H66). The simplicity of the model allowed for a thorough physical-chemical analysis of the system. Differential Scanning Calorimetry (DSC) and Small Angle X-ray Diffraction (SAXD) were employed to map the phase behavior and morphology of the C22H45OH/C32H66/H2O system. In dry stateC22H45OH and C32H66 observe eutectic interaction with substantial changes in the melting temperatures. C32H66 transforms to a second crystalline phase just below the eutectic point.C32H66 do not interact with water but C22H45OH forms a hydrate with a conformational change in hydrocarbon chain packing. Long chain alcohols is a major component in cuticular wax of many plant species and their ability to form hydrates with less ordered chain conformation can add to the understanding of the nature and barrier function of the plant leaf cuticle.
Publisher ISAA Society
Host/Issue Proceedings of the 10th International Symposium on Adjuvants for Agrochemicals (ISAA 2013);
ISBN 978-90-815702-0-6
Pages 257-262
Language eng (iso)
Subject(s) Wax
Cuticle
Phase behavior
DSC
SAXD
Sciences
Research Subject Categories::NATURAL SCIENCES
Note ISAA 2013 – 10th International Symposium on Adjuvants for Agrochemicals, Foz-do-Iguaco, Brazil, 22-27/4 2013.
Handle http://hdl.handle.net/2043/16402 (link to this page)
Link http://events.isaa-online.org/page/251/lookback-on-isaa-2013.html (external link to related web page)

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