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2011 (Vol. 3, Issue: 10)
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. Bessière
Corresponding Author:  ELENGA Raymond Gentil 

Key words:  Drying kinetics, essential oil, Lippia multiflora, modelling, tea, ,
Vol. 3 , (10): 1135-1141
Submitted Accepted Published
2011 June, 21 2011 September, 07 2011 October, 20
Abstract:

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.
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  Cite this Reference:
Raymond G. Elenga, Gouollaly Tsiba, J. Goma Maniongui, Jean M. Ouamba and Jean M. Bessière, 2011. 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, 3(10): 1135-1141.
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