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Abstract
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Article Information:
Effects of Drying Methods on the Drying Kinetics and the Essential Oil of Lippia multiflora Moldenke Leaves
Raymond G. Elenga, Gouollaly Tsiba, J. Goma Maniongui, Jean M. Ouamba and Jean M. Bessi�re
Corresponding Author: ELENGA Raymond Gentil
Submitted:
Accepted: 2011 September, 07
Published: 2011 October, 20 |
Abstract:
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Lippia multiflora is widespread in Africa and America. Its leaves are consumed as tea and have
various medicinal properties. To preserve the flavour and properties, the farmers dry the leaves in shade for six
to ten days. The aim of this work on one hand, is to check the soundness of this traditional drying method by
comparing its effects with those of the forced convective drying at 40, 45, 50, 55 and 60ºC on the drying
kinetics, the composition and content of the Essential Oil (EO) of dried leaves. On the other hand, to test the
agreement of drying curves with the Page model, the Peleg model and the diffusional model. The drying
duration passes from 7 days for shade-drying to 3 h for convective drying at 60ºC, while the composition and
the content of EO do not vary significantly. The three models simulate well the drying kinetics nevertheless the
Page one is the best. Analysed in the framework of Avrami law, its constant values are in agreement with the
unidirectional diffusion. The activation energy obtained from the Peleg model (47.8 kJ/mol) is almost equal to
that deducted from the diffusional model (46.3 kJ/mol). The drying of lippia leaves between 45 and 55ºC
reduces significantly the drying length without degrading the EO. The results obtained from the three models
turn out coherent.
Key words: Drying kinetics, essential oil, Lippia multiflora, modelling, tea, ,
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Cite this Reference:
Raymond G. Elenga, Gouollaly Tsiba, J. Goma Maniongui, Jean M. Ouamba and Jean M. Bessi�re, . Effects of Drying Methods on the Drying Kinetics and the Essential Oil of Lippia multiflora Moldenke Leaves. Research Journal of Applied Sciences, Engineering and Technology, (10): 1135-1141.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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